/*! @name videojs-vr @version 1.7.1 @license Apache-2.0 */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('global/window'), require('global/document'), require('video.js'))
    : typeof define === 'function' && define.amd ? define(['global/window', 'global/document', 'video.js'], factory)
      : (global = global || self, global.videojsVr = factory(global.window, global.document, global.videojs))
}(this, function (window$1, document$1, videojs) {
  'use strict'

  window$1 = window$1 && window$1.hasOwnProperty('default') ? window$1.default : window$1
  document$1 = document$1 && document$1.hasOwnProperty('default') ? document$1.default : document$1
  videojs = videojs && videojs.hasOwnProperty('default') ? videojs.default : videojs

  function _assertThisInitialized (self) {
    if (self === void 0) {
      throw new ReferenceError("this hasn't been initialised - super() hasn't been called")
    }

    return self
  }

  var assertThisInitialized = _assertThisInitialized

  function _inheritsLoose (subClass, superClass) {
    subClass.prototype = Object.create(superClass.prototype)
    subClass.prototype.constructor = subClass
    subClass.__proto__ = superClass
  }

  var inheritsLoose = _inheritsLoose

  var version = '1.7.1'

  var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {}

  function unwrapExports (x) {
  	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x.default : x
  }

  function createCommonjsModule (fn, module) {
  	return module = { exports: {} }, fn(module, module.exports), module.exports
  }

  var webvrPolyfill = createCommonjsModule(function (module, exports) {
  /**
   * @license
   * webvr-polyfill
   * Copyright (c) 2015-2017 Google
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */

    /**
   * @license
   * cardboard-vr-display
   * Copyright (c) 2015-2017 Google
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */

    /**
   * @license
   * webvr-polyfill-dpdb
   * Copyright (c) 2017 Google
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */

    /**
   * @license
   * wglu-preserve-state
   * Copyright (c) 2016, Brandon Jones.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */

    /**
   * @license
   * nosleep.js
   * Copyright (c) 2017, Rich Tibbett
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */

    (function (global, factory) {
  	 module.exports = factory()
    }(commonjsGlobal, function () {
      var commonjsGlobal$1 = typeof window !== 'undefined' ? window : typeof commonjsGlobal !== 'undefined' ? commonjsGlobal : typeof self !== 'undefined' ? self : {}

      function unwrapExports (x) {
  	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x.default : x
      }

      function createCommonjsModule (fn, module) {
  	return module = { exports: {} }, fn(module, module.exports), module.exports
      }

      var race = function race (promises) {
        if (Promise.race) {
          return Promise.race(promises)
        }
        return new Promise(function (resolve, reject) {
          for (var i = 0; i < promises.length; i++) {
            promises[i].then(resolve, reject)
          }
        })
      }

      var isMobile = function isMobile () {
        return (/Android/i.test(navigator.userAgent) || /iPhone|iPad|iPod/i.test(navigator.userAgent)
        )
      }
      var copyArray = function copyArray (source, dest) {
        for (var i = 0, n = source.length; i < n; i++) {
          dest[i] = source[i]
        }
      }
      var extend = function extend (dest, src) {
        for (var key in src) {
          if (src.hasOwnProperty(key)) {
            dest[key] = src[key]
          }
        }
        return dest
      }

      var cardboardVrDisplay = createCommonjsModule(function (module, exports) {
        /**
   * @license
   * cardboard-vr-display
   * Copyright (c) 2015-2017 Google
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
        /**
   * @license
   * gl-preserve-state
   * Copyright (c) 2016, Brandon Jones.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
        /**
   * @license
   * webvr-polyfill-dpdb
   * Copyright (c) 2015-2017 Google
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
        /**
   * @license
   * nosleep.js
   * Copyright (c) 2017, Rich Tibbett
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
        (function (global, factory) {
  	module.exports = factory()
        }(commonjsGlobal$1, function () {
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                Object.defineProperty(target, descriptor.key, descriptor)
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            return function () {
              return isWebViewAndroid
            }
          }())
          var isSafari = (function () {
            var isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent)
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              return isR7
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          var isLandscapeMode = function isLandscapeMode () {
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            return isR7() ? !rtn : rtn
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          var isTimestampDeltaValid = function isTimestampDeltaValid (timestampDeltaS) {
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          var getScreenHeight = function getScreenHeight () {
            return Math.min(window.screen.width, window.screen.height) * window.devicePixelRatio
          }
          var requestFullscreen = function requestFullscreen (element) {
            if (isWebViewAndroid()) {
              return false
            }
            if (element.requestFullscreen) {
              element.requestFullscreen()
            } else if (element.webkitRequestFullscreen) {
              element.webkitRequestFullscreen()
            } else if (element.mozRequestFullScreen) {
              element.mozRequestFullScreen()
            } else if (element.msRequestFullscreen) {
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              return false
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          var exitFullscreen = function exitFullscreen () {
            if (document.exitFullscreen) {
              document.exitFullscreen()
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              document.webkitExitFullscreen()
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              return false
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          }
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          }
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            gl.deleteShader(vertexShader)
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            return program
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              uniformName = uniformInfo.name.replace('[0]', '')
              uniforms[uniformName] = gl.getUniformLocation(program, uniformName)
            }
            return uniforms
          }
          var orthoMatrix = function orthoMatrix (out, left, right, bottom, top, near, far) {
            var lr = 1 / (left - right)
            var bt = 1 / (bottom - top)
            var nf = 1 / (near - far)
            out[0] = -2 * lr
            out[1] = 0
            out[2] = 0
            out[3] = 0
            out[4] = 0
            out[5] = -2 * bt
            out[6] = 0
            out[7] = 0
            out[8] = 0
            out[9] = 0
            out[10] = 2 * nf
            out[11] = 0
            out[12] = (left + right) * lr
            out[13] = (top + bottom) * bt
            out[14] = (far + near) * nf
            out[15] = 1
            return out
          }
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            var check = false;
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              var downTan = Math.tan(fov ? fov.downDegrees * piOver180 : rad45)
              var leftTan = Math.tan(fov ? fov.leftDegrees * piOver180 : rad45)
              var rightTan = Math.tan(fov ? fov.rightDegrees * piOver180 : rad45)
              var xScale = 2.0 / (leftTan + rightTan)
              var yScale = 2.0 / (upTan + downTan)
              out[0] = xScale
              out[1] = 0.0
              out[2] = 0.0
              out[3] = 0.0
              out[4] = 0.0
              out[5] = yScale
              out[6] = 0.0
              out[7] = 0.0
              out[8] = -((leftTan - rightTan) * xScale * 0.5)
              out[9] = (upTan - downTan) * yScale * 0.5
              out[10] = far / (near - far)
              out[11] = -1.0
              out[12] = 0.0
              out[13] = 0.0
              out[14] = far * near / (near - far)
              out[15] = 0.0
              return out
            }
            function mat4_fromRotationTranslation (out, q, v) {
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              var y = q[1]
              var z = q[2]
              var w = q[3]
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              var y2 = y + y
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              out[11] = 0
              out[12] = v[0]
              out[13] = v[1]
              out[14] = v[2]
              out[15] = 1
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              var y = v[1]
              var z = v[2]
              var a00
              var a01
              var a02
              var a03
              var a10
              var a11
              var a12
              var a13
              var a20
              var a21
              var a22
              var a23
              if (a === out) {
                out[12] = a[0] * x + a[4] * y + a[8] * z + a[12]
                out[13] = a[1] * x + a[5] * y + a[9] * z + a[13]
                out[14] = a[2] * x + a[6] * y + a[10] * z + a[14]
                out[15] = a[3] * x + a[7] * y + a[11] * z + a[15]
              } else {
                a00 = a[0]; a01 = a[1]; a02 = a[2]; a03 = a[3]
                a10 = a[4]; a11 = a[5]; a12 = a[6]; a13 = a[7]
                a20 = a[8]; a21 = a[9]; a22 = a[10]; a23 = a[11]
                out[0] = a00; out[1] = a01; out[2] = a02; out[3] = a03
                out[4] = a10; out[5] = a11; out[6] = a12; out[7] = a13
                out[8] = a20; out[9] = a21; out[10] = a22; out[11] = a23
                out[12] = a00 * x + a10 * y + a20 * z + a[12]
                out[13] = a01 * x + a11 * y + a21 * z + a[13]
                out[14] = a02 * x + a12 * y + a22 * z + a[14]
                out[15] = a03 * x + a13 * y + a23 * z + a[15]
              }
              return out
            }
            function mat4_invert (out, a) {
              var a00 = a[0]
              var a01 = a[1]
              var a02 = a[2]
              var a03 = a[3]
              var a10 = a[4]
              var a11 = a[5]
              var a12 = a[6]
              var a13 = a[7]
              var a20 = a[8]
              var a21 = a[9]
              var a22 = a[10]
              var a23 = a[11]
              var a30 = a[12]
              var a31 = a[13]
              var a32 = a[14]
              var a33 = a[15]
              var b00 = a00 * a11 - a01 * a10
              var b01 = a00 * a12 - a02 * a10
              var b02 = a00 * a13 - a03 * a10
              var b03 = a01 * a12 - a02 * a11
              var b04 = a01 * a13 - a03 * a11
              var b05 = a02 * a13 - a03 * a12
              var b06 = a20 * a31 - a21 * a30
              var b07 = a20 * a32 - a22 * a30
              var b08 = a20 * a33 - a23 * a30
              var b09 = a21 * a32 - a22 * a31
              var b10 = a21 * a33 - a23 * a31
              var b11 = a22 * a33 - a23 * a32
              var det = b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06
              if (!det) {
                return null
              }
              det = 1.0 / det
              out[0] = (a11 * b11 - a12 * b10 + a13 * b09) * det
              out[1] = (a02 * b10 - a01 * b11 - a03 * b09) * det
              out[2] = (a31 * b05 - a32 * b04 + a33 * b03) * det
              out[3] = (a22 * b04 - a21 * b05 - a23 * b03) * det
              out[4] = (a12 * b08 - a10 * b11 - a13 * b07) * det
              out[5] = (a00 * b11 - a02 * b08 + a03 * b07) * det
              out[6] = (a32 * b02 - a30 * b05 - a33 * b01) * det
              out[7] = (a20 * b05 - a22 * b02 + a23 * b01) * det
              out[8] = (a10 * b10 - a11 * b08 + a13 * b06) * det
              out[9] = (a01 * b08 - a00 * b10 - a03 * b06) * det
              out[10] = (a30 * b04 - a31 * b02 + a33 * b00) * det
              out[11] = (a21 * b02 - a20 * b04 - a23 * b00) * det
              out[12] = (a11 * b07 - a10 * b09 - a12 * b06) * det
              out[13] = (a00 * b09 - a01 * b07 + a02 * b06) * det
              out[14] = (a31 * b01 - a30 * b03 - a32 * b00) * det
              out[15] = (a20 * b03 - a21 * b01 + a22 * b00) * det
              return out
            }
            var defaultOrientation = new Float32Array([0, 0, 0, 1])
            var defaultPosition = new Float32Array([0, 0, 0])
            function updateEyeMatrices (projection, view, pose, fov, offset, vrDisplay) {
              mat4_perspectiveFromFieldOfView(projection, fov || null, vrDisplay.depthNear, vrDisplay.depthFar)
              var orientation = pose.orientation || defaultOrientation
              var position = pose.position || defaultPosition
              mat4_fromRotationTranslation(view, orientation, position)
              if (offset) mat4_translate(view, view, offset)
              mat4_invert(view, view)
            }
            return function (frameData, pose, vrDisplay) {
              if (!frameData || !pose) return false
              frameData.pose = pose
              frameData.timestamp = pose.timestamp
              updateEyeMatrices(frameData.leftProjectionMatrix, frameData.leftViewMatrix, pose, vrDisplay._getFieldOfView('left'), vrDisplay._getEyeOffset('left'), vrDisplay)
              updateEyeMatrices(frameData.rightProjectionMatrix, frameData.rightViewMatrix, pose, vrDisplay._getFieldOfView('right'), vrDisplay._getEyeOffset('right'), vrDisplay)
              return true
            }
          }())
          var isInsideCrossOriginIFrame = function isInsideCrossOriginIFrame () {
            var isFramed = window.self !== window.top
            var refOrigin = getOriginFromUrl(document.referrer)
            var thisOrigin = getOriginFromUrl(window.location.href)
            return isFramed && refOrigin !== thisOrigin
          }
          var getOriginFromUrl = function getOriginFromUrl (url) {
            var domainIdx
            var protoSepIdx = url.indexOf('://')
            if (protoSepIdx !== -1) {
              domainIdx = protoSepIdx + 3
            } else {
              domainIdx = 0
            }
            var domainEndIdx = url.indexOf('/', domainIdx)
            if (domainEndIdx === -1) {
              domainEndIdx = url.length
            }
            return url.substring(0, domainEndIdx)
          }
          var getQuaternionAngle = function getQuaternionAngle (quat) {
            if (quat.w > 1) {
              console.warn('getQuaternionAngle: w > 1')
              return 0
            }
            var angle = 2 * Math.acos(quat.w)
            return angle
          }
          var warnOnce = (function () {
            var observedWarnings = {}
            return function (key, message) {
              if (observedWarnings[key] === undefined) {
                console.warn('webvr-polyfill: ' + message)
                observedWarnings[key] = true
              }
            }
          }())
          var deprecateWarning = function deprecateWarning (deprecated, suggested) {
            var alternative = suggested ? 'Please use ' + suggested + ' instead.' : ''
            warnOnce(deprecated, deprecated + ' has been deprecated. ' + 'This may not work on native WebVR displays. ' + alternative)
          }
          function WGLUPreserveGLState (gl, bindings, callback) {
            if (!bindings) {
              callback(gl)
              return
            }
            var boundValues = []
            var activeTexture = null
            for (var i = 0; i < bindings.length; ++i) {
              var binding = bindings[i]
              switch (binding) {
                case gl.TEXTURE_BINDING_2D:
                case gl.TEXTURE_BINDING_CUBE_MAP:
                  var textureUnit = bindings[++i]
                  if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31) {
                    console.error('TEXTURE_BINDING_2D or TEXTURE_BINDING_CUBE_MAP must be followed by a valid texture unit')
                    boundValues.push(null, null)
                    break
                  }
                  if (!activeTexture) {
                    activeTexture = gl.getParameter(gl.ACTIVE_TEXTURE)
                  }
                  gl.activeTexture(textureUnit)
                  boundValues.push(gl.getParameter(binding), null)
                  break
                case gl.ACTIVE_TEXTURE:
                  activeTexture = gl.getParameter(gl.ACTIVE_TEXTURE)
                  boundValues.push(null)
                  break
                default:
                  boundValues.push(gl.getParameter(binding))
                  break
              }
            }
            callback(gl)
            for (var i = 0; i < bindings.length; ++i) {
              var binding = bindings[i]
              var boundValue = boundValues[i]
              switch (binding) {
                case gl.ACTIVE_TEXTURE:
                  break
                case gl.ARRAY_BUFFER_BINDING:
                  gl.bindBuffer(gl.ARRAY_BUFFER, boundValue)
                  break
                case gl.COLOR_CLEAR_VALUE:
                  gl.clearColor(boundValue[0], boundValue[1], boundValue[2], boundValue[3])
                  break
                case gl.COLOR_WRITEMASK:
                  gl.colorMask(boundValue[0], boundValue[1], boundValue[2], boundValue[3])
                  break
                case gl.CURRENT_PROGRAM:
                  gl.useProgram(boundValue)
                  break
                case gl.ELEMENT_ARRAY_BUFFER_BINDING:
                  gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, boundValue)
                  break
                case gl.FRAMEBUFFER_BINDING:
                  gl.bindFramebuffer(gl.FRAMEBUFFER, boundValue)
                  break
                case gl.RENDERBUFFER_BINDING:
                  gl.bindRenderbuffer(gl.RENDERBUFFER, boundValue)
                  break
                case gl.TEXTURE_BINDING_2D:
                  var textureUnit = bindings[++i]
                  if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31) { break }
                  gl.activeTexture(textureUnit)
                  gl.bindTexture(gl.TEXTURE_2D, boundValue)
                  break
                case gl.TEXTURE_BINDING_CUBE_MAP:
                  var textureUnit = bindings[++i]
                  if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31) { break }
                  gl.activeTexture(textureUnit)
                  gl.bindTexture(gl.TEXTURE_CUBE_MAP, boundValue)
                  break
                case gl.VIEWPORT:
                  gl.viewport(boundValue[0], boundValue[1], boundValue[2], boundValue[3])
                  break
                case gl.BLEND:
                case gl.CULL_FACE:
                case gl.DEPTH_TEST:
                case gl.SCISSOR_TEST:
                case gl.STENCIL_TEST:
                  if (boundValue) {
                    gl.enable(binding)
                  } else {
                    gl.disable(binding)
                  }
                  break
                default:
                  console.log('No GL restore behavior for 0x' + binding.toString(16))
                  break
              }
              if (activeTexture) {
                gl.activeTexture(activeTexture)
              }
            }
          }
          var glPreserveState = WGLUPreserveGLState
          var distortionVS = ['attribute vec2 position;', 'attribute vec3 texCoord;', 'varying vec2 vTexCoord;', 'uniform vec4 viewportOffsetScale[2];', 'void main() {', '  vec4 viewport = viewportOffsetScale[int(texCoord.z)];', '  vTexCoord = (texCoord.xy * viewport.zw) + viewport.xy;', '  gl_Position = vec4( position, 1.0, 1.0 );', '}'].join('\n')
          var distortionFS = ['precision mediump float;', 'uniform sampler2D diffuse;', 'varying vec2 vTexCoord;', 'void main() {', '  gl_FragColor = texture2D(diffuse, vTexCoord);', '}'].join('\n')
          function CardboardDistorter (gl, cardboardUI, bufferScale, dirtySubmitFrameBindings) {
            this.gl = gl
            this.cardboardUI = cardboardUI
            this.bufferScale = bufferScale
            this.dirtySubmitFrameBindings = dirtySubmitFrameBindings
            this.ctxAttribs = gl.getContextAttributes()
            this.meshWidth = 20
            this.meshHeight = 20
            this.bufferWidth = gl.drawingBufferWidth
            this.bufferHeight = gl.drawingBufferHeight
            this.realBindFramebuffer = gl.bindFramebuffer
            this.realEnable = gl.enable
            this.realDisable = gl.disable
            this.realColorMask = gl.colorMask
            this.realClearColor = gl.clearColor
            this.realViewport = gl.viewport
            if (!isIOS()) {
              this.realCanvasWidth = Object.getOwnPropertyDescriptor(gl.canvas.__proto__, 'width')
              this.realCanvasHeight = Object.getOwnPropertyDescriptor(gl.canvas.__proto__, 'height')
            }
            this.isPatched = false
            this.lastBoundFramebuffer = null
            this.cullFace = false
            this.depthTest = false
            this.blend = false
            this.scissorTest = false
            this.stencilTest = false
            this.viewport = [0, 0, 0, 0]
            this.colorMask = [true, true, true, true]
            this.clearColor = [0, 0, 0, 0]
            this.attribs = {
              position: 0,
              texCoord: 1
            }
            this.program = linkProgram(gl, distortionVS, distortionFS, this.attribs)
            this.uniforms = getProgramUniforms(gl, this.program)
            this.viewportOffsetScale = new Float32Array(8)
            this.setTextureBounds()
            this.vertexBuffer = gl.createBuffer()
            this.indexBuffer = gl.createBuffer()
            this.indexCount = 0
            this.renderTarget = gl.createTexture()
            this.framebuffer = gl.createFramebuffer()
            this.depthStencilBuffer = null
            this.depthBuffer = null
            this.stencilBuffer = null
            if (this.ctxAttribs.depth && this.ctxAttribs.stencil) {
              this.depthStencilBuffer = gl.createRenderbuffer()
            } else if (this.ctxAttribs.depth) {
              this.depthBuffer = gl.createRenderbuffer()
            } else if (this.ctxAttribs.stencil) {
              this.stencilBuffer = gl.createRenderbuffer()
            }
            this.patch()
            this.onResize()
          }
          CardboardDistorter.prototype.destroy = function () {
            var gl = this.gl
            this.unpatch()
            gl.deleteProgram(this.program)
            gl.deleteBuffer(this.vertexBuffer)
            gl.deleteBuffer(this.indexBuffer)
            gl.deleteTexture(this.renderTarget)
            gl.deleteFramebuffer(this.framebuffer)
            if (this.depthStencilBuffer) {
              gl.deleteRenderbuffer(this.depthStencilBuffer)
            }
            if (this.depthBuffer) {
              gl.deleteRenderbuffer(this.depthBuffer)
            }
            if (this.stencilBuffer) {
              gl.deleteRenderbuffer(this.stencilBuffer)
            }
            if (this.cardboardUI) {
              this.cardboardUI.destroy()
            }
          }
          CardboardDistorter.prototype.onResize = function () {
            var gl = this.gl
            var self = this
            var glState = [gl.RENDERBUFFER_BINDING, gl.TEXTURE_BINDING_2D, gl.TEXTURE0]
            glPreserveState(gl, glState, function (gl) {
              self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, null)
              if (self.scissorTest) {
                self.realDisable.call(gl, gl.SCISSOR_TEST)
              }
              self.realColorMask.call(gl, true, true, true, true)
              self.realViewport.call(gl, 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight)
              self.realClearColor.call(gl, 0, 0, 0, 1)
              gl.clear(gl.COLOR_BUFFER_BIT)
              self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, self.framebuffer)
              gl.bindTexture(gl.TEXTURE_2D, self.renderTarget)
              gl.texImage2D(gl.TEXTURE_2D, 0, self.ctxAttribs.alpha ? gl.RGBA : gl.RGB, self.bufferWidth, self.bufferHeight, 0, self.ctxAttribs.alpha ? gl.RGBA : gl.RGB, gl.UNSIGNED_BYTE, null)
              gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
              gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
              gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
              gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
              gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, self.renderTarget, 0)
              if (self.ctxAttribs.depth && self.ctxAttribs.stencil) {
                gl.bindRenderbuffer(gl.RENDERBUFFER, self.depthStencilBuffer)
                gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_STENCIL, self.bufferWidth, self.bufferHeight)
                gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, self.depthStencilBuffer)
              } else if (self.ctxAttribs.depth) {
                gl.bindRenderbuffer(gl.RENDERBUFFER, self.depthBuffer)
                gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, self.bufferWidth, self.bufferHeight)
                gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, self.depthBuffer)
              } else if (self.ctxAttribs.stencil) {
                gl.bindRenderbuffer(gl.RENDERBUFFER, self.stencilBuffer)
                gl.renderbufferStorage(gl.RENDERBUFFER, gl.STENCIL_INDEX8, self.bufferWidth, self.bufferHeight)
                gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, self.stencilBuffer)
              }
              if (!gl.checkFramebufferStatus(gl.FRAMEBUFFER) === gl.FRAMEBUFFER_COMPLETE) {
                console.error('Framebuffer incomplete!')
              }
              self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, self.lastBoundFramebuffer)
              if (self.scissorTest) {
                self.realEnable.call(gl, gl.SCISSOR_TEST)
              }
              self.realColorMask.apply(gl, self.colorMask)
              self.realViewport.apply(gl, self.viewport)
              self.realClearColor.apply(gl, self.clearColor)
            })
            if (this.cardboardUI) {
              this.cardboardUI.onResize()
            }
          }
          CardboardDistorter.prototype.patch = function () {
            if (this.isPatched) {
              return
            }
            var self = this
            var canvas = this.gl.canvas
            var gl = this.gl
            if (!isIOS()) {
              canvas.width = getScreenWidth() * this.bufferScale
              canvas.height = getScreenHeight() * this.bufferScale
              Object.defineProperty(canvas, 'width', {
                configurable: true,
                enumerable: true,
                get: function get () {
                  return self.bufferWidth
                },
                set: function set (value) {
                  self.bufferWidth = value
                  self.realCanvasWidth.set.call(canvas, value)
                  self.onResize()
                }
              })
              Object.defineProperty(canvas, 'height', {
                configurable: true,
                enumerable: true,
                get: function get () {
                  return self.bufferHeight
                },
                set: function set (value) {
                  self.bufferHeight = value
                  self.realCanvasHeight.set.call(canvas, value)
                  self.onResize()
                }
              })
            }
            this.lastBoundFramebuffer = gl.getParameter(gl.FRAMEBUFFER_BINDING)
            if (this.lastBoundFramebuffer == null) {
              this.lastBoundFramebuffer = this.framebuffer
              this.gl.bindFramebuffer(gl.FRAMEBUFFER, this.framebuffer)
            }
            this.gl.bindFramebuffer = function (target, framebuffer) {
              self.lastBoundFramebuffer = framebuffer || self.framebuffer
              self.realBindFramebuffer.call(gl, target, self.lastBoundFramebuffer)
            }
            this.cullFace = gl.getParameter(gl.CULL_FACE)
            this.depthTest = gl.getParameter(gl.DEPTH_TEST)
            this.blend = gl.getParameter(gl.BLEND)
            this.scissorTest = gl.getParameter(gl.SCISSOR_TEST)
            this.stencilTest = gl.getParameter(gl.STENCIL_TEST)
            gl.enable = function (pname) {
              switch (pname) {
                case gl.CULL_FACE:
                  self.cullFace = true; break
                case gl.DEPTH_TEST:
                  self.depthTest = true; break
                case gl.BLEND:
                  self.blend = true; break
                case gl.SCISSOR_TEST:
                  self.scissorTest = true; break
                case gl.STENCIL_TEST:
                  self.stencilTest = true; break
              }
              self.realEnable.call(gl, pname)
            }
            gl.disable = function (pname) {
              switch (pname) {
                case gl.CULL_FACE:
                  self.cullFace = false; break
                case gl.DEPTH_TEST:
                  self.depthTest = false; break
                case gl.BLEND:
                  self.blend = false; break
                case gl.SCISSOR_TEST:
                  self.scissorTest = false; break
                case gl.STENCIL_TEST:
                  self.stencilTest = false; break
              }
              self.realDisable.call(gl, pname)
            }
            this.colorMask = gl.getParameter(gl.COLOR_WRITEMASK)
            gl.colorMask = function (r, g, b, a) {
              self.colorMask[0] = r
              self.colorMask[1] = g
              self.colorMask[2] = b
              self.colorMask[3] = a
              self.realColorMask.call(gl, r, g, b, a)
            }
            this.clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE)
            gl.clearColor = function (r, g, b, a) {
              self.clearColor[0] = r
              self.clearColor[1] = g
              self.clearColor[2] = b
              self.clearColor[3] = a
              self.realClearColor.call(gl, r, g, b, a)
            }
            this.viewport = gl.getParameter(gl.VIEWPORT)
            gl.viewport = function (x, y, w, h) {
              self.viewport[0] = x
              self.viewport[1] = y
              self.viewport[2] = w
              self.viewport[3] = h
              self.realViewport.call(gl, x, y, w, h)
            }
            this.isPatched = true
            safariCssSizeWorkaround(canvas)
          }
          CardboardDistorter.prototype.unpatch = function () {
            if (!this.isPatched) {
              return
            }
            var gl = this.gl
            var canvas = this.gl.canvas
            if (!isIOS()) {
              Object.defineProperty(canvas, 'width', this.realCanvasWidth)
              Object.defineProperty(canvas, 'height', this.realCanvasHeight)
            }
            canvas.width = this.bufferWidth
            canvas.height = this.bufferHeight
            gl.bindFramebuffer = this.realBindFramebuffer
            gl.enable = this.realEnable
            gl.disable = this.realDisable
            gl.colorMask = this.realColorMask
            gl.clearColor = this.realClearColor
            gl.viewport = this.realViewport
            if (this.lastBoundFramebuffer == this.framebuffer) {
              gl.bindFramebuffer(gl.FRAMEBUFFER, null)
            }
            this.isPatched = false
            setTimeout(function () {
              safariCssSizeWorkaround(canvas)
            }, 1)
          }
          CardboardDistorter.prototype.setTextureBounds = function (leftBounds, rightBounds) {
            if (!leftBounds) {
              leftBounds = [0, 0, 0.5, 1]
            }
            if (!rightBounds) {
              rightBounds = [0.5, 0, 0.5, 1]
            }
            this.viewportOffsetScale[0] = leftBounds[0]
            this.viewportOffsetScale[1] = leftBounds[1]
            this.viewportOffsetScale[2] = leftBounds[2]
            this.viewportOffsetScale[3] = leftBounds[3]
            this.viewportOffsetScale[4] = rightBounds[0]
            this.viewportOffsetScale[5] = rightBounds[1]
            this.viewportOffsetScale[6] = rightBounds[2]
            this.viewportOffsetScale[7] = rightBounds[3]
          }
          CardboardDistorter.prototype.submitFrame = function () {
            var gl = this.gl
            var self = this
            var glState = []
            if (!this.dirtySubmitFrameBindings) {
              glState.push(gl.CURRENT_PROGRAM, gl.ARRAY_BUFFER_BINDING, gl.ELEMENT_ARRAY_BUFFER_BINDING, gl.TEXTURE_BINDING_2D, gl.TEXTURE0)
            }
            glPreserveState(gl, glState, function (gl) {
              self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, null)
              if (self.cullFace) {
                self.realDisable.call(gl, gl.CULL_FACE)
              }
              if (self.depthTest) {
                self.realDisable.call(gl, gl.DEPTH_TEST)
              }
              if (self.blend) {
                self.realDisable.call(gl, gl.BLEND)
              }
              if (self.scissorTest) {
                self.realDisable.call(gl, gl.SCISSOR_TEST)
              }
              if (self.stencilTest) {
                self.realDisable.call(gl, gl.STENCIL_TEST)
              }
              self.realColorMask.call(gl, true, true, true, true)
              self.realViewport.call(gl, 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight)
              if (self.ctxAttribs.alpha || isIOS()) {
                self.realClearColor.call(gl, 0, 0, 0, 1)
                gl.clear(gl.COLOR_BUFFER_BIT)
              }
              gl.useProgram(self.program)
              gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, self.indexBuffer)
              gl.bindBuffer(gl.ARRAY_BUFFER, self.vertexBuffer)
              gl.enableVertexAttribArray(self.attribs.position)
              gl.enableVertexAttribArray(self.attribs.texCoord)
              gl.vertexAttribPointer(self.attribs.position, 2, gl.FLOAT, false, 20, 0)
              gl.vertexAttribPointer(self.attribs.texCoord, 3, gl.FLOAT, false, 20, 8)
              gl.activeTexture(gl.TEXTURE0)
              gl.uniform1i(self.uniforms.diffuse, 0)
              gl.bindTexture(gl.TEXTURE_2D, self.renderTarget)
              gl.uniform4fv(self.uniforms.viewportOffsetScale, self.viewportOffsetScale)
              gl.drawElements(gl.TRIANGLES, self.indexCount, gl.UNSIGNED_SHORT, 0)
              if (self.cardboardUI) {
                self.cardboardUI.renderNoState()
              }
              self.realBindFramebuffer.call(self.gl, gl.FRAMEBUFFER, self.framebuffer)
              if (!self.ctxAttribs.preserveDrawingBuffer) {
                self.realClearColor.call(gl, 0, 0, 0, 0)
                gl.clear(gl.COLOR_BUFFER_BIT)
              }
              if (!self.dirtySubmitFrameBindings) {
                self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, self.lastBoundFramebuffer)
              }
              if (self.cullFace) {
                self.realEnable.call(gl, gl.CULL_FACE)
              }
              if (self.depthTest) {
                self.realEnable.call(gl, gl.DEPTH_TEST)
              }
              if (self.blend) {
                self.realEnable.call(gl, gl.BLEND)
              }
              if (self.scissorTest) {
                self.realEnable.call(gl, gl.SCISSOR_TEST)
              }
              if (self.stencilTest) {
                self.realEnable.call(gl, gl.STENCIL_TEST)
              }
              self.realColorMask.apply(gl, self.colorMask)
              self.realViewport.apply(gl, self.viewport)
              if (self.ctxAttribs.alpha || !self.ctxAttribs.preserveDrawingBuffer) {
                self.realClearColor.apply(gl, self.clearColor)
              }
            })
            if (isIOS()) {
              var canvas = gl.canvas
              if (canvas.width != self.bufferWidth || canvas.height != self.bufferHeight) {
                self.bufferWidth = canvas.width
                self.bufferHeight = canvas.height
                self.onResize()
              }
            }
          }
          CardboardDistorter.prototype.updateDeviceInfo = function (deviceInfo) {
            var gl = this.gl
            var self = this
            var glState = [gl.ARRAY_BUFFER_BINDING, gl.ELEMENT_ARRAY_BUFFER_BINDING]
            glPreserveState(gl, glState, function (gl) {
              var vertices = self.computeMeshVertices_(self.meshWidth, self.meshHeight, deviceInfo)
              gl.bindBuffer(gl.ARRAY_BUFFER, self.vertexBuffer)
              gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW)
              if (!self.indexCount) {
                var indices = self.computeMeshIndices_(self.meshWidth, self.meshHeight)
                gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, self.indexBuffer)
                gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW)
                self.indexCount = indices.length
              }
            })
          }
          CardboardDistorter.prototype.computeMeshVertices_ = function (width, height, deviceInfo) {
            var vertices = new Float32Array(2 * width * height * 5)
            var lensFrustum = deviceInfo.getLeftEyeVisibleTanAngles()
            var noLensFrustum = deviceInfo.getLeftEyeNoLensTanAngles()
            var viewport = deviceInfo.getLeftEyeVisibleScreenRect(noLensFrustum)
            var vidx = 0
            for (var e = 0; e < 2; e++) {
              for (var j = 0; j < height; j++) {
                for (var i = 0; i < width; i++, vidx++) {
                  var u = i / (width - 1)
                  var v = j / (height - 1)
                  var s = u
                  var t = v
                  var x = lerp(lensFrustum[0], lensFrustum[2], u)
                  var y = lerp(lensFrustum[3], lensFrustum[1], v)
                  var d = Math.sqrt(x * x + y * y)
                  var r = deviceInfo.distortion.distortInverse(d)
                  var p = x * r / d
                  var q = y * r / d
                  u = (p - noLensFrustum[0]) / (noLensFrustum[2] - noLensFrustum[0])
                  v = (q - noLensFrustum[3]) / (noLensFrustum[1] - noLensFrustum[3])
                  u = (viewport.x + u * viewport.width - 0.5) * 2.0
                  v = (viewport.y + v * viewport.height - 0.5) * 2.0
                  vertices[vidx * 5 + 0] = u
                  vertices[vidx * 5 + 1] = v
                  vertices[vidx * 5 + 2] = s
                  vertices[vidx * 5 + 3] = t
                  vertices[vidx * 5 + 4] = e
                }
              }
              var w = lensFrustum[2] - lensFrustum[0]
              lensFrustum[0] = -(w + lensFrustum[0])
              lensFrustum[2] = w - lensFrustum[2]
              w = noLensFrustum[2] - noLensFrustum[0]
              noLensFrustum[0] = -(w + noLensFrustum[0])
              noLensFrustum[2] = w - noLensFrustum[2]
              viewport.x = 1 - (viewport.x + viewport.width)
            }
            return vertices
          }
          CardboardDistorter.prototype.computeMeshIndices_ = function (width, height) {
            var indices = new Uint16Array(2 * (width - 1) * (height - 1) * 6)
            var halfwidth = width / 2
            var halfheight = height / 2
            var vidx = 0
            var iidx = 0
            for (var e = 0; e < 2; e++) {
              for (var j = 0; j < height; j++) {
                for (var i = 0; i < width; i++, vidx++) {
                  if (i == 0 || j == 0) continue
                  if (i <= halfwidth == j <= halfheight) {
                    indices[iidx++] = vidx
                    indices[iidx++] = vidx - width - 1
                    indices[iidx++] = vidx - width
                    indices[iidx++] = vidx - width - 1
                    indices[iidx++] = vidx
                    indices[iidx++] = vidx - 1
                  } else {
                    indices[iidx++] = vidx - 1
                    indices[iidx++] = vidx - width
                    indices[iidx++] = vidx
                    indices[iidx++] = vidx - width
                    indices[iidx++] = vidx - 1
                    indices[iidx++] = vidx - width - 1
                  }
                }
              }
            }
            return indices
          }
          CardboardDistorter.prototype.getOwnPropertyDescriptor_ = function (proto, attrName) {
            var descriptor = Object.getOwnPropertyDescriptor(proto, attrName)
            if (descriptor.get === undefined || descriptor.set === undefined) {
              descriptor.configurable = true
              descriptor.enumerable = true
              descriptor.get = function () {
                return this.getAttribute(attrName)
              }
              descriptor.set = function (val) {
                this.setAttribute(attrName, val)
              }
            }
            return descriptor
          }
          var uiVS = ['attribute vec2 position;', 'uniform mat4 projectionMat;', 'void main() {', '  gl_Position = projectionMat * vec4( position, -1.0, 1.0 );', '}'].join('\n')
          var uiFS = ['precision mediump float;', 'uniform vec4 color;', 'void main() {', '  gl_FragColor = color;', '}'].join('\n')
          var DEG2RAD = Math.PI / 180.0
          var kAnglePerGearSection = 60
          var kOuterRimEndAngle = 12
          var kInnerRimBeginAngle = 20
          var kOuterRadius = 1
          var kMiddleRadius = 0.75
          var kInnerRadius = 0.3125
          var kCenterLineThicknessDp = 4
          var kButtonWidthDp = 28
          var kTouchSlopFactor = 1.5
          function CardboardUI (gl) {
            this.gl = gl
            this.attribs = {
              position: 0
            }
            this.program = linkProgram(gl, uiVS, uiFS, this.attribs)
            this.uniforms = getProgramUniforms(gl, this.program)
            this.vertexBuffer = gl.createBuffer()
            this.gearOffset = 0
            this.gearVertexCount = 0
            this.arrowOffset = 0
            this.arrowVertexCount = 0
            this.projMat = new Float32Array(16)
            this.listener = null
            this.onResize()
          }
          CardboardUI.prototype.destroy = function () {
            var gl = this.gl
            if (this.listener) {
              gl.canvas.removeEventListener('click', this.listener, false)
            }
            gl.deleteProgram(this.program)
            gl.deleteBuffer(this.vertexBuffer)
          }
          CardboardUI.prototype.listen = function (optionsCallback, backCallback) {
            var canvas = this.gl.canvas
            this.listener = function (event) {
              var midline = canvas.clientWidth / 2
              var buttonSize = kButtonWidthDp * kTouchSlopFactor
              if (event.clientX > midline - buttonSize && event.clientX < midline + buttonSize && event.clientY > canvas.clientHeight - buttonSize) {
                optionsCallback(event)
              } else if (event.clientX < buttonSize && event.clientY < buttonSize) {
                backCallback(event)
              }
            }
            canvas.addEventListener('click', this.listener, false)
          }
          CardboardUI.prototype.onResize = function () {
            var gl = this.gl
            var self = this
            var glState = [gl.ARRAY_BUFFER_BINDING]
            glPreserveState(gl, glState, function (gl) {
              var vertices = []
              var midline = gl.drawingBufferWidth / 2
              var physicalPixels = Math.max(screen.width, screen.height) * window.devicePixelRatio
              var scalingRatio = gl.drawingBufferWidth / physicalPixels
              var dps = scalingRatio * window.devicePixelRatio
              var lineWidth = kCenterLineThicknessDp * dps / 2
              var buttonSize = kButtonWidthDp * kTouchSlopFactor * dps
              var buttonScale = kButtonWidthDp * dps / 2
              var buttonBorder = (kButtonWidthDp * kTouchSlopFactor - kButtonWidthDp) * dps
              vertices.push(midline - lineWidth, buttonSize)
              vertices.push(midline - lineWidth, gl.drawingBufferHeight)
              vertices.push(midline + lineWidth, buttonSize)
              vertices.push(midline + lineWidth, gl.drawingBufferHeight)
              self.gearOffset = vertices.length / 2
              function addGearSegment (theta, r) {
                var angle = (90 - theta) * DEG2RAD
                var x = Math.cos(angle)
                var y = Math.sin(angle)
                vertices.push(kInnerRadius * x * buttonScale + midline, kInnerRadius * y * buttonScale + buttonScale)
                vertices.push(r * x * buttonScale + midline, r * y * buttonScale + buttonScale)
              }
              for (var i = 0; i <= 6; i++) {
                var segmentTheta = i * kAnglePerGearSection
                addGearSegment(segmentTheta, kOuterRadius)
                addGearSegment(segmentTheta + kOuterRimEndAngle, kOuterRadius)
                addGearSegment(segmentTheta + kInnerRimBeginAngle, kMiddleRadius)
                addGearSegment(segmentTheta + (kAnglePerGearSection - kInnerRimBeginAngle), kMiddleRadius)
                addGearSegment(segmentTheta + (kAnglePerGearSection - kOuterRimEndAngle), kOuterRadius)
              }
              self.gearVertexCount = vertices.length / 2 - self.gearOffset
              self.arrowOffset = vertices.length / 2
              function addArrowVertex (x, y) {
                vertices.push(buttonBorder + x, gl.drawingBufferHeight - buttonBorder - y)
              }
              var angledLineWidth = lineWidth / Math.sin(45 * DEG2RAD)
              addArrowVertex(0, buttonScale)
              addArrowVertex(buttonScale, 0)
              addArrowVertex(buttonScale + angledLineWidth, angledLineWidth)
              addArrowVertex(angledLineWidth, buttonScale + angledLineWidth)
              addArrowVertex(angledLineWidth, buttonScale - angledLineWidth)
              addArrowVertex(0, buttonScale)
              addArrowVertex(buttonScale, buttonScale * 2)
              addArrowVertex(buttonScale + angledLineWidth, buttonScale * 2 - angledLineWidth)
              addArrowVertex(angledLineWidth, buttonScale - angledLineWidth)
              addArrowVertex(0, buttonScale)
              addArrowVertex(angledLineWidth, buttonScale - lineWidth)
              addArrowVertex(kButtonWidthDp * dps, buttonScale - lineWidth)
              addArrowVertex(angledLineWidth, buttonScale + lineWidth)
              addArrowVertex(kButtonWidthDp * dps, buttonScale + lineWidth)
              self.arrowVertexCount = vertices.length / 2 - self.arrowOffset
              gl.bindBuffer(gl.ARRAY_BUFFER, self.vertexBuffer)
              gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW)
            })
          }
          CardboardUI.prototype.render = function () {
            var gl = this.gl
            var self = this
            var glState = [gl.CULL_FACE, gl.DEPTH_TEST, gl.BLEND, gl.SCISSOR_TEST, gl.STENCIL_TEST, gl.COLOR_WRITEMASK, gl.VIEWPORT, gl.CURRENT_PROGRAM, gl.ARRAY_BUFFER_BINDING]
            glPreserveState(gl, glState, function (gl) {
              gl.disable(gl.CULL_FACE)
              gl.disable(gl.DEPTH_TEST)
              gl.disable(gl.BLEND)
              gl.disable(gl.SCISSOR_TEST)
              gl.disable(gl.STENCIL_TEST)
              gl.colorMask(true, true, true, true)
              gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight)
              self.renderNoState()
            })
          }
          CardboardUI.prototype.renderNoState = function () {
            var gl = this.gl
            gl.useProgram(this.program)
            gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer)
            gl.enableVertexAttribArray(this.attribs.position)
            gl.vertexAttribPointer(this.attribs.position, 2, gl.FLOAT, false, 8, 0)
            gl.uniform4f(this.uniforms.color, 1.0, 1.0, 1.0, 1.0)
            orthoMatrix(this.projMat, 0, gl.drawingBufferWidth, 0, gl.drawingBufferHeight, 0.1, 1024.0)
            gl.uniformMatrix4fv(this.uniforms.projectionMat, false, this.projMat)
            gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4)
            gl.drawArrays(gl.TRIANGLE_STRIP, this.gearOffset, this.gearVertexCount)
            gl.drawArrays(gl.TRIANGLE_STRIP, this.arrowOffset, this.arrowVertexCount)
          }
          function Distortion (coefficients) {
            this.coefficients = coefficients
          }
          Distortion.prototype.distortInverse = function (radius) {
            var r0 = 0
            var r1 = 1
            var dr0 = radius - this.distort(r0)
            while (Math.abs(r1 - r0) > 0.0001) {
              var dr1 = radius - this.distort(r1)
              var r2 = r1 - dr1 * ((r1 - r0) / (dr1 - dr0))
              r0 = r1
              r1 = r2
              dr0 = dr1
            }
            return r1
          }
          Distortion.prototype.distort = function (radius) {
            var r2 = radius * radius
            var ret = 0
            for (var i = 0; i < this.coefficients.length; i++) {
              ret = r2 * (ret + this.coefficients[i])
            }
            return (ret + 1) * radius
          }
          var degToRad = Math.PI / 180
          var radToDeg = 180 / Math.PI
          var Vector3 = function Vector3 (x, y, z) {
            this.x = x || 0
            this.y = y || 0
            this.z = z || 0
          }
          Vector3.prototype = {
            constructor: Vector3,
            set: function set (x, y, z) {
              this.x = x
              this.y = y
              this.z = z
              return this
            },
            copy: function copy (v) {
              this.x = v.x
              this.y = v.y
              this.z = v.z
              return this
            },
            length: function length () {
              return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z)
            },
            normalize: function normalize () {
              var scalar = this.length()
              if (scalar !== 0) {
                var invScalar = 1 / scalar
                this.multiplyScalar(invScalar)
              } else {
                this.x = 0
                this.y = 0
                this.z = 0
              }
              return this
            },
            multiplyScalar: function multiplyScalar (scalar) {
              this.x *= scalar
              this.y *= scalar
              this.z *= scalar
            },
            applyQuaternion: function applyQuaternion (q) {
              var x = this.x
              var y = this.y
              var z = this.z
              var qx = q.x
              var qy = q.y
              var qz = q.z
              var qw = q.w
              var ix = qw * x + qy * z - qz * y
              var iy = qw * y + qz * x - qx * z
              var iz = qw * z + qx * y - qy * x
              var iw = -qx * x - qy * y - qz * z
              this.x = ix * qw + iw * -qx + iy * -qz - iz * -qy
              this.y = iy * qw + iw * -qy + iz * -qx - ix * -qz
              this.z = iz * qw + iw * -qz + ix * -qy - iy * -qx
              return this
            },
            dot: function dot (v) {
              return this.x * v.x + this.y * v.y + this.z * v.z
            },
            crossVectors: function crossVectors (a, b) {
              var ax = a.x
              var ay = a.y
              var az = a.z
              var bx = b.x
              var by = b.y
              var bz = b.z
              this.x = ay * bz - az * by
              this.y = az * bx - ax * bz
              this.z = ax * by - ay * bx
              return this
            }
          }
          var Quaternion = function Quaternion (x, y, z, w) {
            this.x = x || 0
            this.y = y || 0
            this.z = z || 0
            this.w = w !== undefined ? w : 1
          }
          Quaternion.prototype = {
            constructor: Quaternion,
            set: function set (x, y, z, w) {
              this.x = x
              this.y = y
              this.z = z
              this.w = w
              return this
            },
            copy: function copy (quaternion) {
              this.x = quaternion.x
              this.y = quaternion.y
              this.z = quaternion.z
              this.w = quaternion.w
              return this
            },
            setFromEulerXYZ: function setFromEulerXYZ (x, y, z) {
              var c1 = Math.cos(x / 2)
              var c2 = Math.cos(y / 2)
              var c3 = Math.cos(z / 2)
              var s1 = Math.sin(x / 2)
              var s2 = Math.sin(y / 2)
              var s3 = Math.sin(z / 2)
              this.x = s1 * c2 * c3 + c1 * s2 * s3
              this.y = c1 * s2 * c3 - s1 * c2 * s3
              this.z = c1 * c2 * s3 + s1 * s2 * c3
              this.w = c1 * c2 * c3 - s1 * s2 * s3
              return this
            },
            setFromEulerYXZ: function setFromEulerYXZ (x, y, z) {
              var c1 = Math.cos(x / 2)
              var c2 = Math.cos(y / 2)
              var c3 = Math.cos(z / 2)
              var s1 = Math.sin(x / 2)
              var s2 = Math.sin(y / 2)
              var s3 = Math.sin(z / 2)
              this.x = s1 * c2 * c3 + c1 * s2 * s3
              this.y = c1 * s2 * c3 - s1 * c2 * s3
              this.z = c1 * c2 * s3 - s1 * s2 * c3
              this.w = c1 * c2 * c3 + s1 * s2 * s3
              return this
            },
            setFromAxisAngle: function setFromAxisAngle (axis, angle) {
              var halfAngle = angle / 2
              var s = Math.sin(halfAngle)
              this.x = axis.x * s
              this.y = axis.y * s
              this.z = axis.z * s
              this.w = Math.cos(halfAngle)
              return this
            },
            multiply: function multiply (q) {
              return this.multiplyQuaternions(this, q)
            },
            multiplyQuaternions: function multiplyQuaternions (a, b) {
              var qax = a.x
              var qay = a.y
              var qaz = a.z
              var qaw = a.w
              var qbx = b.x
              var qby = b.y
              var qbz = b.z
              var qbw = b.w
              this.x = qax * qbw + qaw * qbx + qay * qbz - qaz * qby
              this.y = qay * qbw + qaw * qby + qaz * qbx - qax * qbz
              this.z = qaz * qbw + qaw * qbz + qax * qby - qay * qbx
              this.w = qaw * qbw - qax * qbx - qay * qby - qaz * qbz
              return this
            },
            inverse: function inverse () {
              this.x *= -1
              this.y *= -1
              this.z *= -1
              this.normalize()
              return this
            },
            normalize: function normalize () {
              var l = Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w)
              if (l === 0) {
                this.x = 0
                this.y = 0
                this.z = 0
                this.w = 1
              } else {
                l = 1 / l
                this.x = this.x * l
                this.y = this.y * l
                this.z = this.z * l
                this.w = this.w * l
              }
              return this
            },
            slerp: function slerp (qb, t) {
              if (t === 0) return this
              if (t === 1) return this.copy(qb)
              var x = this.x
              var y = this.y
              var z = this.z
              var w = this.w
              var cosHalfTheta = w * qb.w + x * qb.x + y * qb.y + z * qb.z
              if (cosHalfTheta < 0) {
                this.w = -qb.w
                this.x = -qb.x
                this.y = -qb.y
                this.z = -qb.z
                cosHalfTheta = -cosHalfTheta
              } else {
                this.copy(qb)
              }
              if (cosHalfTheta >= 1.0) {
                this.w = w
                this.x = x
                this.y = y
                this.z = z
                return this
              }
              var halfTheta = Math.acos(cosHalfTheta)
              var sinHalfTheta = Math.sqrt(1.0 - cosHalfTheta * cosHalfTheta)
              if (Math.abs(sinHalfTheta) < 0.001) {
                this.w = 0.5 * (w + this.w)
                this.x = 0.5 * (x + this.x)
                this.y = 0.5 * (y + this.y)
                this.z = 0.5 * (z + this.z)
                return this
              }
              var ratioA = Math.sin((1 - t) * halfTheta) / sinHalfTheta
              var ratioB = Math.sin(t * halfTheta) / sinHalfTheta
              this.w = w * ratioA + this.w * ratioB
              this.x = x * ratioA + this.x * ratioB
              this.y = y * ratioA + this.y * ratioB
              this.z = z * ratioA + this.z * ratioB
              return this
            },
            setFromUnitVectors: (function () {
              var v1, r
              var EPS = 0.000001
              return function (vFrom, vTo) {
                if (v1 === undefined) v1 = new Vector3()
                r = vFrom.dot(vTo) + 1
                if (r < EPS) {
                  r = 0
                  if (Math.abs(vFrom.x) > Math.abs(vFrom.z)) {
                    v1.set(-vFrom.y, vFrom.x, 0)
                  } else {
                    v1.set(0, -vFrom.z, vFrom.y)
                  }
                } else {
                  v1.crossVectors(vFrom, vTo)
                }
                this.x = v1.x
                this.y = v1.y
                this.z = v1.z
                this.w = r
                this.normalize()
                return this
              }
            }())
          }
          function Device (params) {
            this.width = params.width || getScreenWidth()
            this.height = params.height || getScreenHeight()
            this.widthMeters = params.widthMeters
            this.heightMeters = params.heightMeters
            this.bevelMeters = params.bevelMeters
          }
          var DEFAULT_ANDROID = new Device({
            widthMeters: 0.110,
            heightMeters: 0.062,
            bevelMeters: 0.004
          })
          var DEFAULT_IOS = new Device({
            widthMeters: 0.1038,
            heightMeters: 0.0584,
            bevelMeters: 0.004
          })
          var Viewers = {
            CardboardV1: new CardboardViewer({
              id: 'CardboardV1',
              label: 'Cardboard I/O 2014',
              fov: 40,
              interLensDistance: 0.060,
              baselineLensDistance: 0.035,
              screenLensDistance: 0.042,
              distortionCoefficients: [0.441, 0.156],
              inverseCoefficients: [-0.4410035, 0.42756155, -0.4804439, 0.5460139, -0.58821183, 0.5733938, -0.48303202, 0.33299083, -0.17573841, 0.0651772, -0.01488963, 0.001559834]
            }),
            CardboardV2: new CardboardViewer({
              id: 'CardboardV2',
              label: 'Cardboard I/O 2015',
              fov: 60,
              interLensDistance: 0.064,
              baselineLensDistance: 0.035,
              screenLensDistance: 0.039,
              distortionCoefficients: [0.34, 0.55],
              inverseCoefficients: [-0.33836704, -0.18162185, 0.862655, -1.2462051, 1.0560602, -0.58208317, 0.21609078, -0.05444823, 0.009177956, -9.904169E-4, 6.183535E-5, -1.6981803E-6]
            })
          }
          function DeviceInfo (deviceParams, additionalViewers) {
            this.viewer = Viewers.CardboardV2
            this.updateDeviceParams(deviceParams)
            this.distortion = new Distortion(this.viewer.distortionCoefficients)
            for (var i = 0; i < additionalViewers.length; i++) {
              var viewer = additionalViewers[i]
              Viewers[viewer.id] = new CardboardViewer(viewer)
            }
          }
          DeviceInfo.prototype.updateDeviceParams = function (deviceParams) {
            this.device = this.determineDevice_(deviceParams) || this.device
          }
          DeviceInfo.prototype.getDevice = function () {
            return this.device
          }
          DeviceInfo.prototype.setViewer = function (viewer) {
            this.viewer = viewer
            this.distortion = new Distortion(this.viewer.distortionCoefficients)
          }
          DeviceInfo.prototype.determineDevice_ = function (deviceParams) {
            if (!deviceParams) {
              if (isIOS()) {
                console.warn('Using fallback iOS device measurements.')
                return DEFAULT_IOS
              } else {
                console.warn('Using fallback Android device measurements.')
                return DEFAULT_ANDROID
              }
            }
            var METERS_PER_INCH = 0.0254
            var metersPerPixelX = METERS_PER_INCH / deviceParams.xdpi
            var metersPerPixelY = METERS_PER_INCH / deviceParams.ydpi
            var width = getScreenWidth()
            var height = getScreenHeight()
            return new Device({
              widthMeters: metersPerPixelX * width,
              heightMeters: metersPerPixelY * height,
              bevelMeters: deviceParams.bevelMm * 0.001
            })
          }
          DeviceInfo.prototype.getDistortedFieldOfViewLeftEye = function () {
            var viewer = this.viewer
            var device = this.device
            var distortion = this.distortion
            var eyeToScreenDistance = viewer.screenLensDistance
            var outerDist = (device.widthMeters - viewer.interLensDistance) / 2
            var innerDist = viewer.interLensDistance / 2
            var bottomDist = viewer.baselineLensDistance - device.bevelMeters
            var topDist = device.heightMeters - bottomDist
            var outerAngle = radToDeg * Math.atan(distortion.distort(outerDist / eyeToScreenDistance))
            var innerAngle = radToDeg * Math.atan(distortion.distort(innerDist / eyeToScreenDistance))
            var bottomAngle = radToDeg * Math.atan(distortion.distort(bottomDist / eyeToScreenDistance))
            var topAngle = radToDeg * Math.atan(distortion.distort(topDist / eyeToScreenDistance))
            return {
              leftDegrees: Math.min(outerAngle, viewer.fov),
              rightDegrees: Math.min(innerAngle, viewer.fov),
              downDegrees: Math.min(bottomAngle, viewer.fov),
              upDegrees: Math.min(topAngle, viewer.fov)
            }
          }
          DeviceInfo.prototype.getLeftEyeVisibleTanAngles = function () {
            var viewer = this.viewer
            var device = this.device
            var distortion = this.distortion
            var fovLeft = Math.tan(-degToRad * viewer.fov)
            var fovTop = Math.tan(degToRad * viewer.fov)
            var fovRight = Math.tan(degToRad * viewer.fov)
            var fovBottom = Math.tan(-degToRad * viewer.fov)
            var halfWidth = device.widthMeters / 4
            var halfHeight = device.heightMeters / 2
            var verticalLensOffset = viewer.baselineLensDistance - device.bevelMeters - halfHeight
            var centerX = viewer.interLensDistance / 2 - halfWidth
            var centerY = -verticalLensOffset
            var centerZ = viewer.screenLensDistance
            var screenLeft = distortion.distort((centerX - halfWidth) / centerZ)
            var screenTop = distortion.distort((centerY + halfHeight) / centerZ)
            var screenRight = distortion.distort((centerX + halfWidth) / centerZ)
            var screenBottom = distortion.distort((centerY - halfHeight) / centerZ)
            var result = new Float32Array(4)
            result[0] = Math.max(fovLeft, screenLeft)
            result[1] = Math.min(fovTop, screenTop)
            result[2] = Math.min(fovRight, screenRight)
            result[3] = Math.max(fovBottom, screenBottom)
            return result
          }
          DeviceInfo.prototype.getLeftEyeNoLensTanAngles = function () {
            var viewer = this.viewer
            var device = this.device
            var distortion = this.distortion
            var result = new Float32Array(4)
            var fovLeft = distortion.distortInverse(Math.tan(-degToRad * viewer.fov))
            var fovTop = distortion.distortInverse(Math.tan(degToRad * viewer.fov))
            var fovRight = distortion.distortInverse(Math.tan(degToRad * viewer.fov))
            var fovBottom = distortion.distortInverse(Math.tan(-degToRad * viewer.fov))
            var halfWidth = device.widthMeters / 4
            var halfHeight = device.heightMeters / 2
            var verticalLensOffset = viewer.baselineLensDistance - device.bevelMeters - halfHeight
            var centerX = viewer.interLensDistance / 2 - halfWidth
            var centerY = -verticalLensOffset
            var centerZ = viewer.screenLensDistance
            var screenLeft = (centerX - halfWidth) / centerZ
            var screenTop = (centerY + halfHeight) / centerZ
            var screenRight = (centerX + halfWidth) / centerZ
            var screenBottom = (centerY - halfHeight) / centerZ
            result[0] = Math.max(fovLeft, screenLeft)
            result[1] = Math.min(fovTop, screenTop)
            result[2] = Math.min(fovRight, screenRight)
            result[3] = Math.max(fovBottom, screenBottom)
            return result
          }
          DeviceInfo.prototype.getLeftEyeVisibleScreenRect = function (undistortedFrustum) {
            var viewer = this.viewer
            var device = this.device
            var dist = viewer.screenLensDistance
            var eyeX = (device.widthMeters - viewer.interLensDistance) / 2
            var eyeY = viewer.baselineLensDistance - device.bevelMeters
            var left = (undistortedFrustum[0] * dist + eyeX) / device.widthMeters
            var top = (undistortedFrustum[1] * dist + eyeY) / device.heightMeters
            var right = (undistortedFrustum[2] * dist + eyeX) / device.widthMeters
            var bottom = (undistortedFrustum[3] * dist + eyeY) / device.heightMeters
            return {
              x: left,
              y: bottom,
              width: right - left,
              height: top - bottom
            }
          }
          DeviceInfo.prototype.getFieldOfViewLeftEye = function (opt_isUndistorted) {
            return opt_isUndistorted ? this.getUndistortedFieldOfViewLeftEye() : this.getDistortedFieldOfViewLeftEye()
          }
          DeviceInfo.prototype.getFieldOfViewRightEye = function (opt_isUndistorted) {
            var fov = this.getFieldOfViewLeftEye(opt_isUndistorted)
            return {
              leftDegrees: fov.rightDegrees,
              rightDegrees: fov.leftDegrees,
              upDegrees: fov.upDegrees,
              downDegrees: fov.downDegrees
            }
          }
          DeviceInfo.prototype.getUndistortedFieldOfViewLeftEye = function () {
            var p = this.getUndistortedParams_()
            return {
              leftDegrees: radToDeg * Math.atan(p.outerDist),
              rightDegrees: radToDeg * Math.atan(p.innerDist),
              downDegrees: radToDeg * Math.atan(p.bottomDist),
              upDegrees: radToDeg * Math.atan(p.topDist)
            }
          }
          DeviceInfo.prototype.getUndistortedViewportLeftEye = function () {
            var p = this.getUndistortedParams_()
            var viewer = this.viewer
            var device = this.device
            var eyeToScreenDistance = viewer.screenLensDistance
            var screenWidth = device.widthMeters / eyeToScreenDistance
            var screenHeight = device.heightMeters / eyeToScreenDistance
            var xPxPerTanAngle = device.width / screenWidth
            var yPxPerTanAngle = device.height / screenHeight
            var x = Math.round((p.eyePosX - p.outerDist) * xPxPerTanAngle)
            var y = Math.round((p.eyePosY - p.bottomDist) * yPxPerTanAngle)
            return {
              x: x,
              y: y,
              width: Math.round((p.eyePosX + p.innerDist) * xPxPerTanAngle) - x,
              height: Math.round((p.eyePosY + p.topDist) * yPxPerTanAngle) - y
            }
          }
          DeviceInfo.prototype.getUndistortedParams_ = function () {
            var viewer = this.viewer
            var device = this.device
            var distortion = this.distortion
            var eyeToScreenDistance = viewer.screenLensDistance
            var halfLensDistance = viewer.interLensDistance / 2 / eyeToScreenDistance
            var screenWidth = device.widthMeters / eyeToScreenDistance
            var screenHeight = device.heightMeters / eyeToScreenDistance
            var eyePosX = screenWidth / 2 - halfLensDistance
            var eyePosY = (viewer.baselineLensDistance - device.bevelMeters) / eyeToScreenDistance
            var maxFov = viewer.fov
            var viewerMax = distortion.distortInverse(Math.tan(degToRad * maxFov))
            var outerDist = Math.min(eyePosX, viewerMax)
            var innerDist = Math.min(halfLensDistance, viewerMax)
            var bottomDist = Math.min(eyePosY, viewerMax)
            var topDist = Math.min(screenHeight - eyePosY, viewerMax)
            return {
              outerDist: outerDist,
              innerDist: innerDist,
              topDist: topDist,
              bottomDist: bottomDist,
              eyePosX: eyePosX,
              eyePosY: eyePosY
            }
          }
          function CardboardViewer (params) {
            this.id = params.id
            this.label = params.label
            this.fov = params.fov
            this.interLensDistance = params.interLensDistance
            this.baselineLensDistance = params.baselineLensDistance
            this.screenLensDistance = params.screenLensDistance
            this.distortionCoefficients = params.distortionCoefficients
            this.inverseCoefficients = params.inverseCoefficients
          }
          DeviceInfo.Viewers = Viewers
          var format = 1
          var last_updated = '2018-02-20T22:55:10Z'
          var devices = [{ type: 'android', rules: [{ mdmh: 'asus/*/Nexus 7/*' }, { ua: 'Nexus 7' }], dpi: [320.8, 323], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'asus/*/ASUS_Z00AD/*' }, { ua: 'ASUS_Z00AD' }], dpi: [403, 404.6], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Google/*/Pixel XL/*' }, { ua: 'Pixel XL' }], dpi: [537.9, 533], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Google/*/Pixel/*' }, { ua: 'Pixel' }], dpi: [432.6, 436.7], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'HTC/*/HTC6435LVW/*' }, { ua: 'HTC6435LVW' }], dpi: [449.7, 443.3], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'HTC/*/HTC One XL/*' }, { ua: 'HTC One XL' }], dpi: [315.3, 314.6], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'htc/*/Nexus 9/*' }, { ua: 'Nexus 9' }], dpi: 289, bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'HTC/*/HTC One M9/*' }, { ua: 'HTC One M9' }], dpi: [442.5, 443.3], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'HTC/*/HTC One_M8/*' }, { ua: 'HTC One_M8' }], dpi: [449.7, 447.4], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'HTC/*/HTC One/*' }, { ua: 'HTC One' }], dpi: 472.8, bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Huawei/*/Nexus 6P/*' }, { ua: 'Nexus 6P' }], dpi: [515.1, 518], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'LENOVO/*/Lenovo PB2-690Y/*' }, { ua: 'Lenovo PB2-690Y' }], dpi: [457.2, 454.713], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'LGE/*/Nexus 5X/*' }, { ua: 'Nexus 5X' }], dpi: [422, 419.9], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'LGE/*/LGMS345/*' }, { ua: 'LGMS345' }], dpi: [221.7, 219.1], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'LGE/*/LG-D800/*' }, { ua: 'LG-D800' }], dpi: [422, 424.1], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'LGE/*/LG-D850/*' }, { ua: 'LG-D850' }], dpi: [537.9, 541.9], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'LGE/*/VS985 4G/*' }, { ua: 'VS985 4G' }], dpi: [537.9, 535.6], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'LGE/*/Nexus 5/*' }, { ua: 'Nexus 5 B' }], dpi: [442.4, 444.8], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'LGE/*/Nexus 4/*' }, { ua: 'Nexus 4' }], dpi: [319.8, 318.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'LGE/*/LG-P769/*' }, { ua: 'LG-P769' }], dpi: [240.6, 247.5], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'LGE/*/LGMS323/*' }, { ua: 'LGMS323' }], dpi: [206.6, 204.6], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'LGE/*/LGLS996/*' }, { ua: 'LGLS996' }], dpi: [403.4, 401.5], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Micromax/*/4560MMX/*' }, { ua: '4560MMX' }], dpi: [240, 219.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Micromax/*/A250/*' }, { ua: 'Micromax A250' }], dpi: [480, 446.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Micromax/*/Micromax AQ4501/*' }, { ua: 'Micromax AQ4501' }], dpi: 240, bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'motorola/*/G5/*' }, { ua: 'Moto G (5) Plus' }], dpi: [403.4, 403], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/DROID RAZR/*' }, { ua: 'DROID RAZR' }], dpi: [368.1, 256.7], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT830C/*' }, { ua: 'XT830C' }], dpi: [254, 255.9], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1021/*' }, { ua: 'XT1021' }], dpi: [254, 256.7], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1023/*' }, { ua: 'XT1023' }], dpi: [254, 256.7], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1028/*' }, { ua: 'XT1028' }], dpi: [326.6, 327.6], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1034/*' }, { ua: 'XT1034' }], dpi: [326.6, 328.4], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1053/*' }, { ua: 'XT1053' }], dpi: [315.3, 316.1], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1562/*' }, { ua: 'XT1562' }], dpi: [403.4, 402.7], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/Nexus 6/*' }, { ua: 'Nexus 6 B' }], dpi: [494.3, 489.7], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1063/*' }, { ua: 'XT1063' }], dpi: [295, 296.6], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1064/*' }, { ua: 'XT1064' }], dpi: [295, 295.6], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1092/*' }, { ua: 'XT1092' }], dpi: [422, 424.1], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'motorola/*/XT1095/*' }, { ua: 'XT1095' }], dpi: [422, 423.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'motorola/*/G4/*' }, { ua: 'Moto G (4)' }], dpi: 401, bw: 4, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'OnePlus/*/A0001/*' }, { ua: 'A0001' }], dpi: [403.4, 401], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'OnePlus/*/ONE E1005/*' }, { ua: 'ONE E1005' }], dpi: [442.4, 441.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'OnePlus/*/ONE A2005/*' }, { ua: 'ONE A2005' }], dpi: [391.9, 405.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'OnePlus/*/ONEPLUS A5000/*' }, { ua: 'ONEPLUS A5000 ' }], dpi: [403.411, 399.737], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'OnePlus/*/ONE A5010/*' }, { ua: 'ONEPLUS A5010' }], dpi: [403, 400], bw: 2, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'OPPO/*/X909/*' }, { ua: 'X909' }], dpi: [442.4, 444.1], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/GT-I9082/*' }, { ua: 'GT-I9082' }], dpi: [184.7, 185.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G360P/*' }, { ua: 'SM-G360P' }], dpi: [196.7, 205.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/Nexus S/*' }, { ua: 'Nexus S' }], dpi: [234.5, 229.8], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/GT-I9300/*' }, { ua: 'GT-I9300' }], dpi: [304.8, 303.9], bw: 5, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-T230NU/*' }, { ua: 'SM-T230NU' }], dpi: 216, bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SGH-T399/*' }, { ua: 'SGH-T399' }], dpi: [217.7, 231.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SGH-M919/*' }, { ua: 'SGH-M919' }], dpi: [440.8, 437.7], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-N9005/*' }, { ua: 'SM-N9005' }], dpi: [386.4, 387], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SAMSUNG-SM-N900A/*' }, { ua: 'SAMSUNG-SM-N900A' }], dpi: [386.4, 387.7], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/GT-I9500/*' }, { ua: 'GT-I9500' }], dpi: [442.5, 443.3], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/GT-I9505/*' }, { ua: 'GT-I9505' }], dpi: 439.4, bw: 4, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G900F/*' }, { ua: 'SM-G900F' }], dpi: [415.6, 431.6], bw: 5, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G900M/*' }, { ua: 'SM-G900M' }], dpi: [415.6, 431.6], bw: 5, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G800F/*' }, { ua: 'SM-G800F' }], dpi: 326.8, bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G906S/*' }, { ua: 'SM-G906S' }], dpi: [562.7, 572.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/GT-I9300/*' }, { ua: 'GT-I9300' }], dpi: [306.7, 304.8], bw: 5, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-T535/*' }, { ua: 'SM-T535' }], dpi: [142.6, 136.4], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-N920C/*' }, { ua: 'SM-N920C' }], dpi: [515.1, 518.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-N920P/*' }, { ua: 'SM-N920P' }], dpi: [386.3655, 390.144], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-N920W8/*' }, { ua: 'SM-N920W8' }], dpi: [515.1, 518.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/GT-I9300I/*' }, { ua: 'GT-I9300I' }], dpi: [304.8, 305.8], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/GT-I9195/*' }, { ua: 'GT-I9195' }], dpi: [249.4, 256.7], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SPH-L520/*' }, { ua: 'SPH-L520' }], dpi: [249.4, 255.9], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SAMSUNG-SGH-I717/*' }, { ua: 'SAMSUNG-SGH-I717' }], dpi: 285.8, bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SPH-D710/*' }, { ua: 'SPH-D710' }], dpi: [217.7, 204.2], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/GT-N7100/*' }, { ua: 'GT-N7100' }], dpi: 265.1, bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SCH-I605/*' }, { ua: 'SCH-I605' }], dpi: 265.1, bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/Galaxy Nexus/*' }, { ua: 'Galaxy Nexus' }], dpi: [315.3, 314.2], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-N910H/*' }, { ua: 'SM-N910H' }], dpi: [515.1, 518], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-N910C/*' }, { ua: 'SM-N910C' }], dpi: [515.2, 520.2], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G130M/*' }, { ua: 'SM-G130M' }], dpi: [165.9, 164.8], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G928I/*' }, { ua: 'SM-G928I' }], dpi: [515.1, 518.4], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G920F/*' }, { ua: 'SM-G920F' }], dpi: 580.6, bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G920P/*' }, { ua: 'SM-G920P' }], dpi: [522.5, 577], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G925F/*' }, { ua: 'SM-G925F' }], dpi: 580.6, bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G925V/*' }, { ua: 'SM-G925V' }], dpi: [522.5, 576.6], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G930F/*' }, { ua: 'SM-G930F' }], dpi: 576.6, bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G935F/*' }, { ua: 'SM-G935F' }], dpi: 533, bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G950F/*' }, { ua: 'SM-G950F' }], dpi: [562.707, 565.293], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'samsung/*/SM-G955U/*' }, { ua: 'SM-G955U' }], dpi: [522.514, 525.762], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'Sony/*/C6903/*' }, { ua: 'C6903' }], dpi: [442.5, 443.3], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'Sony/*/D6653/*' }, { ua: 'D6653' }], dpi: [428.6, 427.6], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Sony/*/E6653/*' }, { ua: 'E6653' }], dpi: [428.6, 425.7], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Sony/*/E6853/*' }, { ua: 'E6853' }], dpi: [403.4, 401.9], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Sony/*/SGP321/*' }, { ua: 'SGP321' }], dpi: [224.7, 224.1], bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'TCT/*/ALCATEL ONE TOUCH Fierce/*' }, { ua: 'ALCATEL ONE TOUCH Fierce' }], dpi: [240, 247.5], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'THL/*/thl 5000/*' }, { ua: 'thl 5000' }], dpi: [480, 443.3], bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'Fly/*/IQ4412/*' }, { ua: 'IQ4412' }], dpi: 307.9, bw: 3, ac: 1000 }, { type: 'android', rules: [{ mdmh: 'ZTE/*/ZTE Blade L2/*' }, { ua: 'ZTE Blade L2' }], dpi: 240, bw: 3, ac: 500 }, { type: 'android', rules: [{ mdmh: 'BENEVE/*/VR518/*' }, { ua: 'VR518' }], dpi: 480, bw: 3, ac: 500 }, { type: 'ios', rules: [{ res: [640, 960] }], dpi: [325.1, 328.4], bw: 4, ac: 1000 }, { type: 'ios', rules: [{ res: [640, 1136] }], dpi: [317.1, 320.2], bw: 3, ac: 1000 }, { type: 'ios', rules: [{ res: [750, 1334] }], dpi: 326.4, bw: 4, ac: 1000 }, { type: 'ios', rules: [{ res: [1242, 2208] }], dpi: [453.6, 458.4], bw: 4, ac: 1000 }, { type: 'ios', rules: [{ res: [1125, 2001] }], dpi: [410.9, 415.4], bw: 4, ac: 1000 }, { type: 'ios', rules: [{ res: [1125, 2436] }], dpi: 458, bw: 4, ac: 1000 }]
          var DPDB_CACHE = {
  	format: format,
  	last_updated: last_updated,
  	devices: devices
          }
          function Dpdb (url, onDeviceParamsUpdated) {
            this.dpdb = DPDB_CACHE
            this.recalculateDeviceParams_()
            if (url) {
              this.onDeviceParamsUpdated = onDeviceParamsUpdated
              var xhr = new XMLHttpRequest()
              var obj = this
              xhr.open('GET', url, true)
              xhr.addEventListener('load', function () {
                obj.loading = false
                if (xhr.status >= 200 && xhr.status <= 299) {
                  obj.dpdb = JSON.parse(xhr.response)
                  obj.recalculateDeviceParams_()
                } else {
                  console.error('Error loading online DPDB!')
                }
              })
              xhr.send()
            }
          }
          Dpdb.prototype.getDeviceParams = function () {
            return this.deviceParams
          }
          Dpdb.prototype.recalculateDeviceParams_ = function () {
            var newDeviceParams = this.calcDeviceParams_()
            if (newDeviceParams) {
              this.deviceParams = newDeviceParams
              if (this.onDeviceParamsUpdated) {
                this.onDeviceParamsUpdated(this.deviceParams)
              }
            } else {
              console.error('Failed to recalculate device parameters.')
            }
          }
          Dpdb.prototype.calcDeviceParams_ = function () {
            var db = this.dpdb
            if (!db) {
              console.error('DPDB not available.')
              return null
            }
            if (db.format != 1) {
              console.error('DPDB has unexpected format version.')
              return null
            }
            if (!db.devices || !db.devices.length) {
              console.error('DPDB does not have a devices section.')
              return null
            }
            var userAgent = navigator.userAgent || navigator.vendor || window.opera
            var width = getScreenWidth()
            var height = getScreenHeight()
            if (!db.devices) {
              console.error('DPDB has no devices section.')
              return null
            }
            for (var i = 0; i < db.devices.length; i++) {
              var device = db.devices[i]
              if (!device.rules) {
                console.warn('Device[' + i + '] has no rules section.')
                continue
              }
              if (device.type != 'ios' && device.type != 'android') {
                console.warn('Device[' + i + '] has invalid type.')
                continue
              }
              if (isIOS() != (device.type == 'ios')) continue
              var matched = false
              for (var j = 0; j < device.rules.length; j++) {
                var rule = device.rules[j]
                if (this.matchRule_(rule, userAgent, width, height)) {
                  matched = true
                  break
                }
              }
              if (!matched) continue
              var xdpi = device.dpi[0] || device.dpi
              var ydpi = device.dpi[1] || device.dpi
              return new DeviceParams({ xdpi: xdpi, ydpi: ydpi, bevelMm: device.bw })
            }
            console.warn('No DPDB device match.')
            return null
          }
          Dpdb.prototype.matchRule_ = function (rule, ua, screenWidth, screenHeight) {
            if (!rule.ua && !rule.res) return false
            if (rule.ua && ua.indexOf(rule.ua) < 0) return false
            if (rule.res) {
              if (!rule.res[0] || !rule.res[1]) return false
              var resX = rule.res[0]
              var resY = rule.res[1]
              if (Math.min(screenWidth, screenHeight) != Math.min(resX, resY) || Math.max(screenWidth, screenHeight) != Math.max(resX, resY)) {
                return false
              }
            }
            return true
          }
          function DeviceParams (params) {
            this.xdpi = params.xdpi
            this.ydpi = params.ydpi
            this.bevelMm = params.bevelMm
          }
          function SensorSample (sample, timestampS) {
            this.set(sample, timestampS)
          }
          SensorSample.prototype.set = function (sample, timestampS) {
            this.sample = sample
            this.timestampS = timestampS
          }
          SensorSample.prototype.copy = function (sensorSample) {
            this.set(sensorSample.sample, sensorSample.timestampS)
          }
          function ComplementaryFilter (kFilter, isDebug) {
            this.kFilter = kFilter
            this.isDebug = isDebug
            this.currentAccelMeasurement = new SensorSample()
            this.currentGyroMeasurement = new SensorSample()
            this.previousGyroMeasurement = new SensorSample()
            if (isIOS()) {
              this.filterQ = new Quaternion(-1, 0, 0, 1)
            } else {
              this.filterQ = new Quaternion(1, 0, 0, 1)
            }
            this.previousFilterQ = new Quaternion()
            this.previousFilterQ.copy(this.filterQ)
            this.accelQ = new Quaternion()
            this.isOrientationInitialized = false
            this.estimatedGravity = new Vector3()
            this.measuredGravity = new Vector3()
            this.gyroIntegralQ = new Quaternion()
          }
          ComplementaryFilter.prototype.addAccelMeasurement = function (vector, timestampS) {
            this.currentAccelMeasurement.set(vector, timestampS)
          }
          ComplementaryFilter.prototype.addGyroMeasurement = function (vector, timestampS) {
            this.currentGyroMeasurement.set(vector, timestampS)
            var deltaT = timestampS - this.previousGyroMeasurement.timestampS
            if (isTimestampDeltaValid(deltaT)) {
              this.run_()
            }
            this.previousGyroMeasurement.copy(this.currentGyroMeasurement)
          }
          ComplementaryFilter.prototype.run_ = function () {
            if (!this.isOrientationInitialized) {
              this.accelQ = this.accelToQuaternion_(this.currentAccelMeasurement.sample)
              this.previousFilterQ.copy(this.accelQ)
              this.isOrientationInitialized = true
              return
            }
            var deltaT = this.currentGyroMeasurement.timestampS - this.previousGyroMeasurement.timestampS
            var gyroDeltaQ = this.gyroToQuaternionDelta_(this.currentGyroMeasurement.sample, deltaT)
            this.gyroIntegralQ.multiply(gyroDeltaQ)
            this.filterQ.copy(this.previousFilterQ)
            this.filterQ.multiply(gyroDeltaQ)
            var invFilterQ = new Quaternion()
            invFilterQ.copy(this.filterQ)
            invFilterQ.inverse()
            this.estimatedGravity.set(0, 0, -1)
            this.estimatedGravity.applyQuaternion(invFilterQ)
            this.estimatedGravity.normalize()
            this.measuredGravity.copy(this.currentAccelMeasurement.sample)
            this.measuredGravity.normalize()
            var deltaQ = new Quaternion()
            deltaQ.setFromUnitVectors(this.estimatedGravity, this.measuredGravity)
            deltaQ.inverse()
            if (this.isDebug) {
              console.log('Delta: %d deg, G_est: (%s, %s, %s), G_meas: (%s, %s, %s)', radToDeg * getQuaternionAngle(deltaQ), this.estimatedGravity.x.toFixed(1), this.estimatedGravity.y.toFixed(1), this.estimatedGravity.z.toFixed(1), this.measuredGravity.x.toFixed(1), this.measuredGravity.y.toFixed(1), this.measuredGravity.z.toFixed(1))
            }
            var targetQ = new Quaternion()
            targetQ.copy(this.filterQ)
            targetQ.multiply(deltaQ)
            this.filterQ.slerp(targetQ, 1 - this.kFilter)
            this.previousFilterQ.copy(this.filterQ)
          }
          ComplementaryFilter.prototype.getOrientation = function () {
            return this.filterQ
          }
          ComplementaryFilter.prototype.accelToQuaternion_ = function (accel) {
            var normAccel = new Vector3()
            normAccel.copy(accel)
            normAccel.normalize()
            var quat = new Quaternion()
            quat.setFromUnitVectors(new Vector3(0, 0, -1), normAccel)
            quat.inverse()
            return quat
          }
          ComplementaryFilter.prototype.gyroToQuaternionDelta_ = function (gyro, dt) {
            var quat = new Quaternion()
            var axis = new Vector3()
            axis.copy(gyro)
            axis.normalize()
            quat.setFromAxisAngle(axis, gyro.length() * dt)
            return quat
          }
          function PosePredictor (predictionTimeS, isDebug) {
            this.predictionTimeS = predictionTimeS
            this.isDebug = isDebug
            this.previousQ = new Quaternion()
            this.previousTimestampS = null
            this.deltaQ = new Quaternion()
            this.outQ = new Quaternion()
          }
          PosePredictor.prototype.getPrediction = function (currentQ, gyro, timestampS) {
            if (!this.previousTimestampS) {
              this.previousQ.copy(currentQ)
              this.previousTimestampS = timestampS
              return currentQ
            }
            var axis = new Vector3()
            axis.copy(gyro)
            axis.normalize()
            var angularSpeed = gyro.length()
            if (angularSpeed < degToRad * 20) {
              if (this.isDebug) {
                console.log('Moving slowly, at %s deg/s: no prediction', (radToDeg * angularSpeed).toFixed(1))
              }
              this.outQ.copy(currentQ)
              this.previousQ.copy(currentQ)
              return this.outQ
            }
            var predictAngle = angularSpeed * this.predictionTimeS
            this.deltaQ.setFromAxisAngle(axis, predictAngle)
            this.outQ.copy(this.previousQ)
            this.outQ.multiply(this.deltaQ)
            this.previousQ.copy(currentQ)
            this.previousTimestampS = timestampS
            return this.outQ
          }
          function FusionPoseSensor (kFilter, predictionTime, yawOnly, isDebug) {
            this.yawOnly = yawOnly
            this.accelerometer = new Vector3()
            this.gyroscope = new Vector3()
            this.filter = new ComplementaryFilter(kFilter, isDebug)
            this.posePredictor = new PosePredictor(predictionTime, isDebug)
            this.isFirefoxAndroid = isFirefoxAndroid()
            this.isIOS = isIOS()
            var chromeVersion = getChromeVersion()
            this.isDeviceMotionInRadians = !this.isIOS && chromeVersion && chromeVersion < 66
            this.isWithoutDeviceMotion = isChromeWithoutDeviceMotion()
            this.filterToWorldQ = new Quaternion()
            if (isIOS()) {
              this.filterToWorldQ.setFromAxisAngle(new Vector3(1, 0, 0), Math.PI / 2)
            } else {
              this.filterToWorldQ.setFromAxisAngle(new Vector3(1, 0, 0), -Math.PI / 2)
            }
            this.inverseWorldToScreenQ = new Quaternion()
            this.worldToScreenQ = new Quaternion()
            this.originalPoseAdjustQ = new Quaternion()
            this.originalPoseAdjustQ.setFromAxisAngle(new Vector3(0, 0, 1), -window.orientation * Math.PI / 180)
            this.setScreenTransform_()
            if (isLandscapeMode()) {
              this.filterToWorldQ.multiply(this.inverseWorldToScreenQ)
            }
            this.resetQ = new Quaternion()
            this.orientationOut_ = new Float32Array(4)
            this.start()
          }
          FusionPoseSensor.prototype.getPosition = function () {
            return null
          }
          FusionPoseSensor.prototype.getOrientation = function () {
            var orientation = void 0
            if (this.isWithoutDeviceMotion && this._deviceOrientationQ) {
              this.deviceOrientationFixQ = this.deviceOrientationFixQ || (function () {
                var z = new Quaternion().setFromAxisAngle(new Vector3(0, 0, -1), 0)
                var y = new Quaternion()
                if (window.orientation === -90) {
                  y.setFromAxisAngle(new Vector3(0, 1, 0), Math.PI / -2)
                } else {
                  y.setFromAxisAngle(new Vector3(0, 1, 0), Math.PI / 2)
                }
                return z.multiply(y)
              }())
              this.deviceOrientationFilterToWorldQ = this.deviceOrientationFilterToWorldQ || (function () {
                var q = new Quaternion()
                q.setFromAxisAngle(new Vector3(1, 0, 0), -Math.PI / 2)
                return q
              }())
              orientation = this._deviceOrientationQ
              var out = new Quaternion()
              out.copy(orientation)
              out.multiply(this.deviceOrientationFilterToWorldQ)
              out.multiply(this.resetQ)
              out.multiply(this.worldToScreenQ)
              out.multiplyQuaternions(this.deviceOrientationFixQ, out)
              if (this.yawOnly) {
                out.x = 0
                out.z = 0
                out.normalize()
              }
              this.orientationOut_[0] = out.x
              this.orientationOut_[1] = out.y
              this.orientationOut_[2] = out.z
              this.orientationOut_[3] = out.w
              return this.orientationOut_
            } else {
              var filterOrientation = this.filter.getOrientation()
              orientation = this.posePredictor.getPrediction(filterOrientation, this.gyroscope, this.previousTimestampS)
            }
            var out = new Quaternion()
            out.copy(this.filterToWorldQ)
            out.multiply(this.resetQ)
            out.multiply(orientation)
            out.multiply(this.worldToScreenQ)
            if (this.yawOnly) {
              out.x = 0
              out.z = 0
              out.normalize()
            }
            this.orientationOut_[0] = out.x
            this.orientationOut_[1] = out.y
            this.orientationOut_[2] = out.z
            this.orientationOut_[3] = out.w
            return this.orientationOut_
          }
          FusionPoseSensor.prototype.resetPose = function () {
            this.resetQ.copy(this.filter.getOrientation())
            this.resetQ.x = 0
            this.resetQ.y = 0
            this.resetQ.z *= -1
            this.resetQ.normalize()
            if (isLandscapeMode()) {
              this.resetQ.multiply(this.inverseWorldToScreenQ)
            }
            this.resetQ.multiply(this.originalPoseAdjustQ)
          }
          FusionPoseSensor.prototype.onDeviceOrientation_ = function (e) {
            this._deviceOrientationQ = this._deviceOrientationQ || new Quaternion()
            var alpha = e.alpha
            var beta = e.beta
            var gamma = e.gamma
            alpha = (alpha || 0) * Math.PI / 180
            beta = (beta || 0) * Math.PI / 180
            gamma = (gamma || 0) * Math.PI / 180
            this._deviceOrientationQ.setFromEulerYXZ(beta, alpha, -gamma)
          }
          FusionPoseSensor.prototype.onDeviceMotion_ = function (deviceMotion) {
            this.updateDeviceMotion_(deviceMotion)
          }
          FusionPoseSensor.prototype.updateDeviceMotion_ = function (deviceMotion) {
            var accGravity = deviceMotion.accelerationIncludingGravity
            var rotRate = deviceMotion.rotationRate
            var timestampS = deviceMotion.timeStamp / 1000
            var deltaS = timestampS - this.previousTimestampS
            if (deltaS < 0) {
              warnOnce('fusion-pose-sensor:invalid:non-monotonic', 'Invalid timestamps detected: non-monotonic timestamp from devicemotion')
              this.previousTimestampS = timestampS
              return
            } else if (deltaS <= MIN_TIMESTEP || deltaS > MAX_TIMESTEP) {
              warnOnce('fusion-pose-sensor:invalid:outside-threshold', 'Invalid timestamps detected: Timestamp from devicemotion outside expected range.')
              this.previousTimestampS = timestampS
              return
            }
            this.accelerometer.set(-accGravity.x, -accGravity.y, -accGravity.z)
            if (isR7()) {
              this.gyroscope.set(-rotRate.beta, rotRate.alpha, rotRate.gamma)
            } else {
              this.gyroscope.set(rotRate.alpha, rotRate.beta, rotRate.gamma)
            }
            if (!this.isDeviceMotionInRadians) {
              this.gyroscope.multiplyScalar(Math.PI / 180)
            }
            this.filter.addAccelMeasurement(this.accelerometer, timestampS)
            this.filter.addGyroMeasurement(this.gyroscope, timestampS)
            this.previousTimestampS = timestampS
          }
          FusionPoseSensor.prototype.onOrientationChange_ = function (screenOrientation) {
            this.setScreenTransform_()
          }
          FusionPoseSensor.prototype.onMessage_ = function (event) {
            var message = event.data
            if (!message || !message.type) {
              return
            }
            var type = message.type.toLowerCase()
            if (type !== 'devicemotion') {
              return
            }
            this.updateDeviceMotion_(message.deviceMotionEvent)
          }
          FusionPoseSensor.prototype.setScreenTransform_ = function () {
            this.worldToScreenQ.set(0, 0, 0, 1)
            switch (window.orientation) {
              case 0:
                break
              case 90:
                this.worldToScreenQ.setFromAxisAngle(new Vector3(0, 0, 1), -Math.PI / 2)
                break
              case -90:
                this.worldToScreenQ.setFromAxisAngle(new Vector3(0, 0, 1), Math.PI / 2)
                break
              case 180:
                break
            }
            this.inverseWorldToScreenQ.copy(this.worldToScreenQ)
            this.inverseWorldToScreenQ.inverse()
          }
          FusionPoseSensor.prototype.start = function () {
            this.onDeviceMotionCallback_ = this.onDeviceMotion_.bind(this)
            this.onOrientationChangeCallback_ = this.onOrientationChange_.bind(this)
            this.onMessageCallback_ = this.onMessage_.bind(this)
            this.onDeviceOrientationCallback_ = this.onDeviceOrientation_.bind(this)
            if (isIOS() && isInsideCrossOriginIFrame()) {
              window.addEventListener('message', this.onMessageCallback_)
            }
            window.addEventListener('orientationchange', this.onOrientationChangeCallback_)
            if (this.isWithoutDeviceMotion) {
              window.addEventListener('deviceorientation', this.onDeviceOrientationCallback_)
            } else {
              window.addEventListener('devicemotion', this.onDeviceMotionCallback_)
            }
          }
          FusionPoseSensor.prototype.stop = function () {
            window.removeEventListener('devicemotion', this.onDeviceMotionCallback_)
            window.removeEventListener('deviceorientation', this.onDeviceOrientationCallback_)
            window.removeEventListener('orientationchange', this.onOrientationChangeCallback_)
            window.removeEventListener('message', this.onMessageCallback_)
          }
          var SENSOR_FREQUENCY = 60
          var X_AXIS = new Vector3(1, 0, 0)
          var Z_AXIS = new Vector3(0, 0, 1)
          var orientation = {}
          if (screen.orientation) {
            orientation = screen.orientation
          } else if (screen.msOrientation) {
            orientation = screen.msOrientation
          } else {
            Object.defineProperty(orientation, 'angle', {
              get: function get$$1 () {
                return window.orientation || 0
              }
            })
          }
          var SENSOR_TO_VR = new Quaternion()
          SENSOR_TO_VR.setFromAxisAngle(X_AXIS, -Math.PI / 2)
          SENSOR_TO_VR.multiply(new Quaternion().setFromAxisAngle(Z_AXIS, Math.PI / 2))
          var PoseSensor = (function () {
            function PoseSensor (config) {
              classCallCheck(this, PoseSensor)
              this.config = config
              this.sensor = null
              this.fusionSensor = null
              this._out = new Float32Array(4)
              this.api = null
              this.errors = []
              this._sensorQ = new Quaternion()
              this._worldToScreenQ = new Quaternion()
              this._outQ = new Quaternion()
              this._onSensorRead = this._onSensorRead.bind(this)
              this._onSensorError = this._onSensorError.bind(this)
              this._onOrientationChange = this._onOrientationChange.bind(this)
              this._onOrientationChange()
              this.init()
            }
            createClass(PoseSensor, [{
              key: 'init',
              value: function init () {
                var sensor = null
                try {
                  sensor = new RelativeOrientationSensor({ frequency: SENSOR_FREQUENCY })
                  sensor.addEventListener('error', this._onSensorError)
                } catch (error) {
                  this.errors.push(error)
                  if (error.name === 'SecurityError') {
                    console.error('Cannot construct sensors due to the Feature Policy')
                    console.warn('Attempting to fall back using "devicemotion"; however this will ' + 'fail in the future without correct permissions.')
                    this.useDeviceMotion()
                  } else if (error.name === 'ReferenceError') {
                    this.useDeviceMotion()
                  } else {
                    console.error(error)
                  }
                }
                if (sensor) {
                  this.api = 'sensor'
                  this.sensor = sensor
                  this.sensor.addEventListener('reading', this._onSensorRead)
                  this.sensor.start()
                }
                window.addEventListener('orientationchange', this._onOrientationChange)
              }
            }, {
              key: 'useDeviceMotion',
              value: function useDeviceMotion () {
                this.api = 'devicemotion'
                this.fusionSensor = new FusionPoseSensor(this.config.K_FILTER, this.config.PREDICTION_TIME_S, this.config.YAW_ONLY, this.config.DEBUG)
                if (this.sensor) {
                  this.sensor.removeEventListener('reading', this._onSensorRead)
                  this.sensor.removeEventListener('error', this._onSensorError)
                  this.sensor = null
                }
              }
            }, {
              key: 'getOrientation',
              value: function getOrientation () {
                if (this.fusionSensor) {
                  return this.fusionSensor.getOrientation()
                }
                if (!this.sensor || !this.sensor.quaternion) {
                  this._out[0] = this._out[1] = this._out[2] = 0
                  this._out[3] = 1
                  return this._out
                }
                var q = this.sensor.quaternion
                this._sensorQ.set(q[0], q[1], q[2], q[3])
                var out = this._outQ
                out.copy(SENSOR_TO_VR)
                out.multiply(this._sensorQ)
                out.multiply(this._worldToScreenQ)
                if (this.config.YAW_ONLY) {
                  out.x = out.z = 0
                  out.normalize()
                }
                this._out[0] = out.x
                this._out[1] = out.y
                this._out[2] = out.z
                this._out[3] = out.w
                return this._out
              }
            }, {
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          function RotateInstructions () {
            this.loadIcon_()
            var overlay = document.createElement('div')
            var s = overlay.style
            s.position = 'fixed'
            s.top = 0
            s.right = 0
            s.bottom = 0
            s.left = 0
            s.backgroundColor = 'gray'
            s.fontFamily = 'sans-serif'
            s.zIndex = 1000000
            var img = document.createElement('img')
            img.src = this.icon
            var s = img.style
            s.marginLeft = '25%'
            s.marginTop = '25%'
            s.width = '50%'
            overlay.appendChild(img)
            var text = document.createElement('div')
            var s = text.style
            s.textAlign = 'center'
            s.fontSize = '16px'
            s.lineHeight = '24px'
            s.margin = '24px 25%'
            s.width = '50%'
            text.innerHTML = 'Place your phone into your Cardboard viewer.'
            overlay.appendChild(text)
            var snackbar = document.createElement('div')
            var s = snackbar.style
            s.backgroundColor = '#CFD8DC'
            s.position = 'fixed'
            s.bottom = 0
            s.width = '100%'
            s.height = '48px'
            s.padding = '14px 24px'
            s.boxSizing = 'border-box'
            s.color = '#656A6B'
            overlay.appendChild(snackbar)
            var snackbarText = document.createElement('div')
            snackbarText.style.float = 'left'
            snackbarText.innerHTML = 'No Cardboard viewer?'
            var snackbarButton = document.createElement('a')
            snackbarButton.href = 'https://www.google.com/get/cardboard/get-cardboard/'
            snackbarButton.innerHTML = 'get one'
            snackbarButton.target = '_blank'
            var s = snackbarButton.style
            s.float = 'right'
            s.fontWeight = 600
            s.textTransform = 'uppercase'
            s.borderLeft = '1px solid gray'
            s.paddingLeft = '24px'
            s.textDecoration = 'none'
            s.color = '#656A6B'
            snackbar.appendChild(snackbarText)
            snackbar.appendChild(snackbarButton)
            this.overlay = overlay
            this.text = text
            this.hide()
          }
          RotateInstructions.prototype.show = function (parent) {
            if (!parent && !this.overlay.parentElement) {
              document.body.appendChild(this.overlay)
            } else if (parent) {
              if (this.overlay.parentElement && this.overlay.parentElement != parent) this.overlay.parentElement.removeChild(this.overlay)
              parent.appendChild(this.overlay)
            }
            this.overlay.style.display = 'block'
            var img = this.overlay.querySelector('img')
            var s = img.style
            if (isLandscapeMode()) {
              s.width = '20%'
              s.marginLeft = '40%'
              s.marginTop = '3%'
            } else {
              s.width = '50%'
              s.marginLeft = '25%'
              s.marginTop = '25%'
            }
          }
          RotateInstructions.prototype.hide = function () {
            this.overlay.style.display = 'none'
          }
          RotateInstructions.prototype.showTemporarily = function (ms, parent) {
            this.show(parent)
            this.timer = setTimeout(this.hide.bind(this), ms)
          }
          RotateInstructions.prototype.disableShowTemporarily = function () {
            clearTimeout(this.timer)
          }
          RotateInstructions.prototype.update = function () {
            this.disableShowTemporarily()
            if (!isLandscapeMode() && isMobile()) {
              this.show()
            } else {
              this.hide()
            }
          }
          RotateInstructions.prototype.loadIcon_ = function () {
            this.icon = base64('image/svg+xml', rotateInstructionsAsset)
          }
          var DEFAULT_VIEWER = 'CardboardV1'
          var VIEWER_KEY = 'WEBVR_CARDBOARD_VIEWER'
          var CLASS_NAME = 'webvr-polyfill-viewer-selector'
          function ViewerSelector (defaultViewer) {
            try {
              this.selectedKey = localStorage.getItem(VIEWER_KEY)
            } catch (error) {
              console.error('Failed to load viewer profile: %s', error)
            }
            if (!this.selectedKey) {
              this.selectedKey = defaultViewer || DEFAULT_VIEWER
            }
            this.dialog = this.createDialog_(DeviceInfo.Viewers)
            this.root = null
            this.onChangeCallbacks_ = []
          }
          ViewerSelector.prototype.show = function (root) {
            this.root = root
            root.appendChild(this.dialog)
            var selected = this.dialog.querySelector('#' + this.selectedKey)
            selected.checked = true
            this.dialog.style.display = 'block'
          }
          ViewerSelector.prototype.hide = function () {
            if (this.root && this.root.contains(this.dialog)) {
              this.root.removeChild(this.dialog)
            }
            this.dialog.style.display = 'none'
          }
          ViewerSelector.prototype.getCurrentViewer = function () {
            return DeviceInfo.Viewers[this.selectedKey]
          }
          ViewerSelector.prototype.getSelectedKey_ = function () {
            var input = this.dialog.querySelector('input[name=field]:checked')
            if (input) {
              return input.id
            }
            return null
          }
          ViewerSelector.prototype.onChange = function (cb) {
            this.onChangeCallbacks_.push(cb)
          }
          ViewerSelector.prototype.fireOnChange_ = function (viewer) {
            for (var i = 0; i < this.onChangeCallbacks_.length; i++) {
              this.onChangeCallbacks_[i](viewer)
            }
          }
          ViewerSelector.prototype.onSave_ = function () {
            this.selectedKey = this.getSelectedKey_()
            if (!this.selectedKey || !DeviceInfo.Viewers[this.selectedKey]) {
              console.error('ViewerSelector.onSave_: this should never happen!')
              return
            }
            this.fireOnChange_(DeviceInfo.Viewers[this.selectedKey])
            try {
              localStorage.setItem(VIEWER_KEY, this.selectedKey)
            } catch (error) {
              console.error('Failed to save viewer profile: %s', error)
            }
            this.hide()
          }
          ViewerSelector.prototype.createDialog_ = function (options) {
            var container = document.createElement('div')
            container.classList.add(CLASS_NAME)
            container.style.display = 'none'
            var overlay = document.createElement('div')
            var s = overlay.style
            s.position = 'fixed'
            s.left = 0
            s.top = 0
            s.width = '100%'
            s.height = '100%'
            s.background = 'rgba(0, 0, 0, 0.3)'
            overlay.addEventListener('click', this.hide.bind(this))
            var width = 280
            var dialog = document.createElement('div')
            var s = dialog.style
            s.boxSizing = 'border-box'
            s.position = 'fixed'
            s.top = '24px'
            s.left = '50%'
            s.marginLeft = -width / 2 + 'px'
            s.width = width + 'px'
            s.padding = '24px'
            s.overflow = 'hidden'
            s.background = '#fafafa'
            s.fontFamily = "'Roboto', sans-serif"
            s.boxShadow = '0px 5px 20px #666'
            dialog.appendChild(this.createH1_('Select your viewer'))
            for (var id in options) {
              dialog.appendChild(this.createChoice_(id, options[id].label))
            }
            dialog.appendChild(this.createButton_('Save', this.onSave_.bind(this)))
            container.appendChild(overlay)
            container.appendChild(dialog)
            return container
          }
          ViewerSelector.prototype.createH1_ = function (name) {
            var h1 = document.createElement('h1')
            var s = h1.style
            s.color = 'black'
            s.fontSize = '20px'
            s.fontWeight = 'bold'
            s.marginTop = 0
            s.marginBottom = '24px'
            h1.innerHTML = name
            return h1
          }
          ViewerSelector.prototype.createChoice_ = function (id, name) {
            var div = document.createElement('div')
            div.style.marginTop = '8px'
            div.style.color = 'black'
            var input = document.createElement('input')
            input.style.fontSize = '30px'
            input.setAttribute('id', id)
            input.setAttribute('type', 'radio')
            input.setAttribute('value', id)
            input.setAttribute('name', 'field')
            var label = document.createElement('label')
            label.style.marginLeft = '4px'
            label.setAttribute('for', id)
            label.innerHTML = name
            div.appendChild(input)
            div.appendChild(label)
            return div
          }
          ViewerSelector.prototype.createButton_ = function (label, onclick) {
            var button = document.createElement('button')
            button.innerHTML = label
            var s = button.style
            s.float = 'right'
            s.textTransform = 'uppercase'
            s.color = '#1094f7'
            s.fontSize = '14px'
            s.letterSpacing = 0
            s.border = 0
            s.background = 'none'
            s.marginTop = '16px'
            button.addEventListener('click', onclick)
            return button
          }
          var commonjsGlobal$$1 = typeof window !== 'undefined' ? window : typeof commonjsGlobal$1 !== 'undefined' ? commonjsGlobal$1 : typeof self !== 'undefined' ? self : {}
          function unwrapExports$$1 (x) {
  	return x && x.__esModule ? x.default : x
          }
          function createCommonjsModule$$1 (fn, module) {
  	return module = { exports: {} }, fn(module, module.exports), module.exports
          }
          var NoSleep = createCommonjsModule$$1(function (module, exports) {
            (function webpackUniversalModuleDefinition (root, factory) {
  	module.exports = factory()
            })(commonjsGlobal$$1, function () {
              return (function (modules) {
           	var installedModules = {}
           	function __webpack_require__ (moduleId) {
           		if (installedModules[moduleId]) {
           			return installedModules[moduleId].exports
           		}
           		var module = installedModules[moduleId] = {
           			i: moduleId,
           			l: false,
           			exports: {}
           		}
           		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__)
           		module.l = true
           		return module.exports
           	}
           	__webpack_require__.m = modules
           	__webpack_require__.c = installedModules
           	__webpack_require__.d = function (exports, name, getter) {
           		if (!__webpack_require__.o(exports, name)) {
           			Object.defineProperty(exports, name, {
           				configurable: false,
           				enumerable: true,
           				get: getter
           			})
           		}
           	}
           	__webpack_require__.n = function (module) {
           		var getter = module && module.__esModule
           			? function getDefault () { return module.default }
           			: function getModuleExports () { return module }
           		__webpack_require__.d(getter, 'a', getter)
           		return getter
           	}
           	__webpack_require__.o = function (object, property) { return Object.prototype.hasOwnProperty.call(object, property) }
           	__webpack_require__.p = ''
           	return __webpack_require__(__webpack_require__.s = 0)
              })
              ([
                function (module, exports, __webpack_require__) {
                  var _createClass = (function () { function defineProperties (target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor) } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor } }())
                  function _classCallCheck (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function') } }
                  var mediaFile = __webpack_require__(1)
                  var oldIOS = typeof navigator !== 'undefined' && parseFloat(('' + (/CPU.*OS ([0-9_]{3,4})[0-9_]{0,1}|(CPU like).*AppleWebKit.*Mobile/i.exec(navigator.userAgent) || [0, ''])[1]).replace('undefined', '3_2').replace('_', '.').replace('_', '')) < 10 && !window.MSStream
                  var NoSleep = (function () {
                    function NoSleep () {
                      _classCallCheck(this, NoSleep)
                      if (oldIOS) {
                        this.noSleepTimer = null
                      } else {
                        this.noSleepVideo = document.createElement('video')
                        this.noSleepVideo.setAttribute('playsinline', '')
                        this.noSleepVideo.setAttribute('src', mediaFile)
                        this.noSleepVideo.addEventListener('timeupdate', function (e) {
                          if (this.noSleepVideo.currentTime > 0.5) {
                            this.noSleepVideo.currentTime = Math.random()
                          }
                        }.bind(this))
                      }
                    }
                    _createClass(NoSleep, [{
                      key: 'enable',
                      value: function enable () {
                        if (oldIOS) {
                          this.disable()
                          this.noSleepTimer = window.setInterval(function () {
                            window.location.href = '/'
                            window.setTimeout(window.stop, 0)
                          }, 15000)
                        } else {
                          this.noSleepVideo.play()
                        }
                      }
                    }, {
                      key: 'disable',
                      value: function disable () {
                        if (oldIOS) {
                          if (this.noSleepTimer) {
                            window.clearInterval(this.noSleepTimer)
                            this.noSleepTimer = null
                          }
                        } else {
                          this.noSleepVideo.pause()
                        }
                      }
                    }])
                    return NoSleep
                  }())
                  module.exports = NoSleep
                },
                function (module, exports, __webpack_require__) {
                  module.exports = 'data:video/mp4;base64,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                }
              ])
            })
          })
          var NoSleep$1 = unwrapExports$$1(NoSleep)
          var nextDisplayId = 1000
          var defaultLeftBounds = [0, 0, 0.5, 1]
          var defaultRightBounds = [0.5, 0, 0.5, 1]
          var raf = window.requestAnimationFrame
          var caf = window.cancelAnimationFrame
          function VRFrameData () {
            this.leftProjectionMatrix = new Float32Array(16)
            this.leftViewMatrix = new Float32Array(16)
            this.rightProjectionMatrix = new Float32Array(16)
            this.rightViewMatrix = new Float32Array(16)
            this.pose = null
          }
          function VRDisplayCapabilities (config) {
            Object.defineProperties(this, {
              hasPosition: {
                writable: false, enumerable: true, value: config.hasPosition
              },
              hasExternalDisplay: {
                writable: false, enumerable: true, value: config.hasExternalDisplay
              },
              canPresent: {
                writable: false, enumerable: true, value: config.canPresent
              },
              maxLayers: {
                writable: false, enumerable: true, value: config.maxLayers
              },
              hasOrientation: {
                enumerable: true,
                get: function get () {
                  deprecateWarning('VRDisplayCapabilities.prototype.hasOrientation', 'VRDisplay.prototype.getFrameData')
                  return config.hasOrientation
                }
              }
            })
          }
          function VRDisplay (config) {
            config = config || {}
            var USE_WAKELOCK = 'wakelock' in config ? config.wakelock : true
            this.isPolyfilled = true
            this.displayId = nextDisplayId++
            this.displayName = ''
            this.depthNear = 0.01
            this.depthFar = 10000.0
            this.isPresenting = false
            Object.defineProperty(this, 'isConnected', {
              get: function get () {
                deprecateWarning('VRDisplay.prototype.isConnected', 'VRDisplayCapabilities.prototype.hasExternalDisplay')
                return false
              }
            })
            this.capabilities = new VRDisplayCapabilities({
              hasPosition: false,
              hasOrientation: false,
              hasExternalDisplay: false,
              canPresent: false,
              maxLayers: 1
            })
            this.stageParameters = null
            this.waitingForPresent_ = false
            this.layer_ = null
            this.originalParent_ = null
            this.fullscreenElement_ = null
            this.fullscreenWrapper_ = null
            this.fullscreenElementCachedStyle_ = null
            this.fullscreenEventTarget_ = null
            this.fullscreenChangeHandler_ = null
            this.fullscreenErrorHandler_ = null
            if (USE_WAKELOCK && isMobile()) {
              this.wakelock_ = new NoSleep$1()
            }
          }
          VRDisplay.prototype.getFrameData = function (frameData) {
            return frameDataFromPose(frameData, this._getPose(), this)
          }
          VRDisplay.prototype.getPose = function () {
            deprecateWarning('VRDisplay.prototype.getPose', 'VRDisplay.prototype.getFrameData')
            return this._getPose()
          }
          VRDisplay.prototype.resetPose = function () {
            deprecateWarning('VRDisplay.prototype.resetPose')
            return this._resetPose()
          }
          VRDisplay.prototype.getImmediatePose = function () {
            deprecateWarning('VRDisplay.prototype.getImmediatePose', 'VRDisplay.prototype.getFrameData')
            return this._getPose()
          }
          VRDisplay.prototype.requestAnimationFrame = function (callback) {
            return raf(callback)
          }
          VRDisplay.prototype.cancelAnimationFrame = function (id) {
            return caf(id)
          }
          VRDisplay.prototype.wrapForFullscreen = function (element) {
            if (isIOS()) {
              return element
            }
            if (!this.fullscreenWrapper_) {
              this.fullscreenWrapper_ = document.createElement('div')
              var cssProperties = ['height: ' + Math.min(screen.height, screen.width) + 'px !important', 'top: 0 !important', 'left: 0 !important', 'right: 0 !important', 'border: 0', 'margin: 0', 'padding: 0', 'z-index: 999999 !important', 'position: fixed']
              this.fullscreenWrapper_.setAttribute('style', cssProperties.join('; ') + ';')
              this.fullscreenWrapper_.classList.add('webvr-polyfill-fullscreen-wrapper')
            }
            if (this.fullscreenElement_ == element) {
              return this.fullscreenWrapper_
            }
            if (this.fullscreenElement_) {
              if (this.originalParent_) {
                this.originalParent_.appendChild(this.fullscreenElement_)
              } else {
                this.fullscreenElement_.parentElement.removeChild(this.fullscreenElement_)
              }
            }
            this.fullscreenElement_ = element
            this.originalParent_ = element.parentElement
            if (!this.originalParent_) {
              document.body.appendChild(element)
            }
            if (!this.fullscreenWrapper_.parentElement) {
              var parent = this.fullscreenElement_.parentElement
              parent.insertBefore(this.fullscreenWrapper_, this.fullscreenElement_)
              parent.removeChild(this.fullscreenElement_)
            }
            this.fullscreenWrapper_.insertBefore(this.fullscreenElement_, this.fullscreenWrapper_.firstChild)
            this.fullscreenElementCachedStyle_ = this.fullscreenElement_.getAttribute('style')
            var self = this
            function applyFullscreenElementStyle () {
              if (!self.fullscreenElement_) {
                return
              }
              var cssProperties = ['position: absolute', 'top: 0', 'left: 0', 'width: ' + Math.max(screen.width, screen.height) + 'px', 'height: ' + Math.min(screen.height, screen.width) + 'px', 'border: 0', 'margin: 0', 'padding: 0']
              self.fullscreenElement_.setAttribute('style', cssProperties.join('; ') + ';')
            }
            applyFullscreenElementStyle()
            return this.fullscreenWrapper_
          }
          VRDisplay.prototype.removeFullscreenWrapper = function () {
            if (!this.fullscreenElement_) {
              return
            }
            var element = this.fullscreenElement_
            if (this.fullscreenElementCachedStyle_) {
              element.setAttribute('style', this.fullscreenElementCachedStyle_)
            } else {
              element.removeAttribute('style')
            }
            this.fullscreenElement_ = null
            this.fullscreenElementCachedStyle_ = null
            var parent = this.fullscreenWrapper_.parentElement
            this.fullscreenWrapper_.removeChild(element)
            if (this.originalParent_ === parent) {
              parent.insertBefore(element, this.fullscreenWrapper_)
            } else if (this.originalParent_) {
              this.originalParent_.appendChild(element)
            }
            parent.removeChild(this.fullscreenWrapper_)
            return element
          }
          VRDisplay.prototype.requestPresent = function (layers) {
            var wasPresenting = this.isPresenting
            var self = this
            if (!(layers instanceof Array)) {
              deprecateWarning('VRDisplay.prototype.requestPresent with non-array argument', 'an array of VRLayers as the first argument')
              layers = [layers]
            }
            return new Promise(function (resolve, reject) {
              if (!self.capabilities.canPresent) {
                reject(new Error('VRDisplay is not capable of presenting.'))
                return
              }
              if (layers.length == 0 || layers.length > self.capabilities.maxLayers) {
                reject(new Error('Invalid number of layers.'))
                return
              }
              var incomingLayer = layers[0]
              if (!incomingLayer.source) {
                resolve()
                return
              }
              var leftBounds = incomingLayer.leftBounds || defaultLeftBounds
              var rightBounds = incomingLayer.rightBounds || defaultRightBounds
              if (wasPresenting) {
                var layer = self.layer_
                if (layer.source !== incomingLayer.source) {
                  layer.source = incomingLayer.source
                }
                for (var i = 0; i < 4; i++) {
                  layer.leftBounds[i] = leftBounds[i]
                  layer.rightBounds[i] = rightBounds[i]
                }
                self.wrapForFullscreen(self.layer_.source)
                self.updatePresent_()
                resolve()
                return
              }
              self.layer_ = {
                predistorted: incomingLayer.predistorted,
                source: incomingLayer.source,
                leftBounds: leftBounds.slice(0),
                rightBounds: rightBounds.slice(0)
              }
              self.waitingForPresent_ = false
              if (self.layer_ && self.layer_.source) {
                var fullscreenElement = self.wrapForFullscreen(self.layer_.source)
                var onFullscreenChange = function onFullscreenChange () {
                  var actualFullscreenElement = getFullscreenElement()
                  self.isPresenting = fullscreenElement === actualFullscreenElement
                  if (self.isPresenting) {
                    if (screen.orientation && screen.orientation.lock) {
                      screen.orientation.lock('landscape-primary').catch(function (error) {
                        console.error('screen.orientation.lock() failed due to', error.message)
                      })
                    }
                    self.waitingForPresent_ = false
                    self.beginPresent_()
                    resolve()
                  } else {
                    if (screen.orientation && screen.orientation.unlock) {
                      screen.orientation.unlock()
                    }
                    self.removeFullscreenWrapper()
                    self.disableWakeLock()
                    self.endPresent_()
                    self.removeFullscreenListeners_()
                  }
                  self.fireVRDisplayPresentChange_()
                }
                var onFullscreenError = function onFullscreenError () {
                  if (!self.waitingForPresent_) {
                    return
                  }
                  self.removeFullscreenWrapper()
                  self.removeFullscreenListeners_()
                  self.disableWakeLock()
                  self.waitingForPresent_ = false
                  self.isPresenting = false
                  reject(new Error('Unable to present.'))
                }
                self.addFullscreenListeners_(fullscreenElement, onFullscreenChange, onFullscreenError)
                if (requestFullscreen(fullscreenElement)) {
                  self.enableWakeLock()
                  self.waitingForPresent_ = true
                } else if (isIOS() || isWebViewAndroid()) {
                  self.enableWakeLock()
                  self.isPresenting = true
                  self.beginPresent_()
                  self.fireVRDisplayPresentChange_()
                  resolve()
                }
              }
              if (!self.waitingForPresent_ && !isIOS()) {
                exitFullscreen()
                reject(new Error('Unable to present.'))
              }
            })
          }
          VRDisplay.prototype.exitPresent = function () {
            var wasPresenting = this.isPresenting
            var self = this
            this.isPresenting = false
            this.layer_ = null
            this.disableWakeLock()
            return new Promise(function (resolve, reject) {
              if (wasPresenting) {
                if (!exitFullscreen() && isIOS()) {
                  self.endPresent_()
                  self.fireVRDisplayPresentChange_()
                }
                if (isWebViewAndroid()) {
                  self.removeFullscreenWrapper()
                  self.removeFullscreenListeners_()
                  self.endPresent_()
                  self.fireVRDisplayPresentChange_()
                }
                resolve()
              } else {
                reject(new Error('Was not presenting to VRDisplay.'))
              }
            })
          }
          VRDisplay.prototype.getLayers = function () {
            if (this.layer_) {
              return [this.layer_]
            }
            return []
          }
          VRDisplay.prototype.fireVRDisplayPresentChange_ = function () {
            var event = new CustomEvent('vrdisplaypresentchange', { detail: { display: this } })
            window.dispatchEvent(event)
          }
          VRDisplay.prototype.fireVRDisplayConnect_ = function () {
            var event = new CustomEvent('vrdisplayconnect', { detail: { display: this } })
            window.dispatchEvent(event)
          }
          VRDisplay.prototype.addFullscreenListeners_ = function (element, changeHandler, errorHandler) {
            this.removeFullscreenListeners_()
            this.fullscreenEventTarget_ = element
            this.fullscreenChangeHandler_ = changeHandler
            this.fullscreenErrorHandler_ = errorHandler
            if (changeHandler) {
              if (document.fullscreenEnabled) {
                element.addEventListener('fullscreenchange', changeHandler, false)
              } else if (document.webkitFullscreenEnabled) {
                element.addEventListener('webkitfullscreenchange', changeHandler, false)
              } else if (document.mozFullScreenEnabled) {
                document.addEventListener('mozfullscreenchange', changeHandler, false)
              } else if (document.msFullscreenEnabled) {
                element.addEventListener('msfullscreenchange', changeHandler, false)
              }
            }
            if (errorHandler) {
              if (document.fullscreenEnabled) {
                element.addEventListener('fullscreenerror', errorHandler, false)
              } else if (document.webkitFullscreenEnabled) {
                element.addEventListener('webkitfullscreenerror', errorHandler, false)
              } else if (document.mozFullScreenEnabled) {
                document.addEventListener('mozfullscreenerror', errorHandler, false)
              } else if (document.msFullscreenEnabled) {
                element.addEventListener('msfullscreenerror', errorHandler, false)
              }
            }
          }
          VRDisplay.prototype.removeFullscreenListeners_ = function () {
            if (!this.fullscreenEventTarget_) return
            var element = this.fullscreenEventTarget_
            if (this.fullscreenChangeHandler_) {
              var changeHandler = this.fullscreenChangeHandler_
              element.removeEventListener('fullscreenchange', changeHandler, false)
              element.removeEventListener('webkitfullscreenchange', changeHandler, false)
              document.removeEventListener('mozfullscreenchange', changeHandler, false)
              element.removeEventListener('msfullscreenchange', changeHandler, false)
            }
            if (this.fullscreenErrorHandler_) {
              var errorHandler = this.fullscreenErrorHandler_
              element.removeEventListener('fullscreenerror', errorHandler, false)
              element.removeEventListener('webkitfullscreenerror', errorHandler, false)
              document.removeEventListener('mozfullscreenerror', errorHandler, false)
              element.removeEventListener('msfullscreenerror', errorHandler, false)
            }
            this.fullscreenEventTarget_ = null
            this.fullscreenChangeHandler_ = null
            this.fullscreenErrorHandler_ = null
          }
          VRDisplay.prototype.enableWakeLock = function () {
            if (this.wakelock_) {
              this.wakelock_.enable()
            }
          }
          VRDisplay.prototype.disableWakeLock = function () {
            if (this.wakelock_) {
              this.wakelock_.disable()
            }
          }
          VRDisplay.prototype.beginPresent_ = function () {
          }
          VRDisplay.prototype.endPresent_ = function () {
          }
          VRDisplay.prototype.submitFrame = function (pose) {
          }
          VRDisplay.prototype.getEyeParameters = function (whichEye) {
            return null
          }
          var config = {
            ADDITIONAL_VIEWERS: [],
            DEFAULT_VIEWER: '',
            MOBILE_WAKE_LOCK: true,
            DEBUG: false,
            DPDB_URL: 'https://dpdb.webvr.rocks/dpdb.json',
            K_FILTER: 0.98,
            PREDICTION_TIME_S: 0.040,
            CARDBOARD_UI_DISABLED: false,
            ROTATE_INSTRUCTIONS_DISABLED: false,
            YAW_ONLY: false,
            BUFFER_SCALE: 0.5,
            DIRTY_SUBMIT_FRAME_BINDINGS: false
          }
          var Eye = {
            LEFT: 'left',
            RIGHT: 'right'
          }
          function CardboardVRDisplay (config$$1) {
            var defaults = extend({}, config)
            config$$1 = extend(defaults, config$$1 || {})
            VRDisplay.call(this, {
              wakelock: config$$1.MOBILE_WAKE_LOCK
            })
            this.config = config$$1
            this.displayName = 'Cardboard VRDisplay'
            this.capabilities = new VRDisplayCapabilities({
              hasPosition: false,
              hasOrientation: true,
              hasExternalDisplay: false,
              canPresent: true,
              maxLayers: 1
            })
            this.stageParameters = null
            this.bufferScale_ = this.config.BUFFER_SCALE
            this.poseSensor_ = new PoseSensor(this.config)
            this.distorter_ = null
            this.cardboardUI_ = null
            this.dpdb_ = new Dpdb(this.config.DPDB_URL, this.onDeviceParamsUpdated_.bind(this))
            this.deviceInfo_ = new DeviceInfo(this.dpdb_.getDeviceParams(), config$$1.ADDITIONAL_VIEWERS)
            this.viewerSelector_ = new ViewerSelector(config$$1.DEFAULT_VIEWER)
            this.viewerSelector_.onChange(this.onViewerChanged_.bind(this))
            this.deviceInfo_.setViewer(this.viewerSelector_.getCurrentViewer())
            if (!this.config.ROTATE_INSTRUCTIONS_DISABLED) {
              this.rotateInstructions_ = new RotateInstructions()
            }
            if (isIOS()) {
              window.addEventListener('resize', this.onResize_.bind(this))
            }
          }
          CardboardVRDisplay.prototype = Object.create(VRDisplay.prototype)
          CardboardVRDisplay.prototype._getPose = function () {
            return {
              position: null,
              orientation: this.poseSensor_.getOrientation(),
              linearVelocity: null,
              linearAcceleration: null,
              angularVelocity: null,
              angularAcceleration: null
            }
          }
          CardboardVRDisplay.prototype._resetPose = function () {
            if (this.poseSensor_.resetPose) {
              this.poseSensor_.resetPose()
            }
          }
          CardboardVRDisplay.prototype._getFieldOfView = function (whichEye) {
            var fieldOfView
            if (whichEye == Eye.LEFT) {
              fieldOfView = this.deviceInfo_.getFieldOfViewLeftEye()
            } else if (whichEye == Eye.RIGHT) {
              fieldOfView = this.deviceInfo_.getFieldOfViewRightEye()
            } else {
              console.error('Invalid eye provided: %s', whichEye)
              return null
            }
            return fieldOfView
          }
          CardboardVRDisplay.prototype._getEyeOffset = function (whichEye) {
            var offset
            if (whichEye == Eye.LEFT) {
              offset = [-this.deviceInfo_.viewer.interLensDistance * 0.5, 0.0, 0.0]
            } else if (whichEye == Eye.RIGHT) {
              offset = [this.deviceInfo_.viewer.interLensDistance * 0.5, 0.0, 0.0]
            } else {
              console.error('Invalid eye provided: %s', whichEye)
              return null
            }
            return offset
          }
          CardboardVRDisplay.prototype.getEyeParameters = function (whichEye) {
            var offset = this._getEyeOffset(whichEye)
            var fieldOfView = this._getFieldOfView(whichEye)
            var eyeParams = {
              offset: offset,
              renderWidth: this.deviceInfo_.device.width * 0.5 * this.bufferScale_,
              renderHeight: this.deviceInfo_.device.height * this.bufferScale_
            }
            Object.defineProperty(eyeParams, 'fieldOfView', {
              enumerable: true,
              get: function get () {
                deprecateWarning('VRFieldOfView', 'VRFrameData\'s projection matrices')
                return fieldOfView
              }
            })
            return eyeParams
          }
          CardboardVRDisplay.prototype.onDeviceParamsUpdated_ = function (newParams) {
            if (this.config.DEBUG) {
              console.log('DPDB reported that device params were updated.')
            }
            this.deviceInfo_.updateDeviceParams(newParams)
            if (this.distorter_) {
              this.distorter_.updateDeviceInfo(this.deviceInfo_)
            }
          }
          CardboardVRDisplay.prototype.updateBounds_ = function () {
            if (this.layer_ && this.distorter_ && (this.layer_.leftBounds || this.layer_.rightBounds)) {
              this.distorter_.setTextureBounds(this.layer_.leftBounds, this.layer_.rightBounds)
            }
          }
          CardboardVRDisplay.prototype.beginPresent_ = function () {
            var gl = this.layer_.source.getContext('webgl')
            if (!gl) gl = this.layer_.source.getContext('experimental-webgl')
            if (!gl) gl = this.layer_.source.getContext('webgl2')
            if (!gl) return
            if (this.layer_.predistorted) {
              if (!this.config.CARDBOARD_UI_DISABLED) {
                gl.canvas.width = getScreenWidth() * this.bufferScale_
                gl.canvas.height = getScreenHeight() * this.bufferScale_
                this.cardboardUI_ = new CardboardUI(gl)
              }
            } else {
              if (!this.config.CARDBOARD_UI_DISABLED) {
                this.cardboardUI_ = new CardboardUI(gl)
              }
              this.distorter_ = new CardboardDistorter(gl, this.cardboardUI_, this.config.BUFFER_SCALE, this.config.DIRTY_SUBMIT_FRAME_BINDINGS)
              this.distorter_.updateDeviceInfo(this.deviceInfo_)
            }
            if (this.cardboardUI_) {
              this.cardboardUI_.listen(function (e) {
                this.viewerSelector_.show(this.layer_.source.parentElement)
                e.stopPropagation()
                e.preventDefault()
              }.bind(this), function (e) {
                this.exitPresent()
                e.stopPropagation()
                e.preventDefault()
              }.bind(this))
            }
            if (this.rotateInstructions_) {
              if (isLandscapeMode() && isMobile()) {
                this.rotateInstructions_.showTemporarily(3000, this.layer_.source.parentElement)
              } else {
                this.rotateInstructions_.update()
              }
            }
            this.orientationHandler = this.onOrientationChange_.bind(this)
            window.addEventListener('orientationchange', this.orientationHandler)
            this.vrdisplaypresentchangeHandler = this.updateBounds_.bind(this)
            window.addEventListener('vrdisplaypresentchange', this.vrdisplaypresentchangeHandler)
            this.fireVRDisplayDeviceParamsChange_()
          }
          CardboardVRDisplay.prototype.endPresent_ = function () {
            if (this.distorter_) {
              this.distorter_.destroy()
              this.distorter_ = null
            }
            if (this.cardboardUI_) {
              this.cardboardUI_.destroy()
              this.cardboardUI_ = null
            }
            if (this.rotateInstructions_) {
              this.rotateInstructions_.hide()
            }
            this.viewerSelector_.hide()
            window.removeEventListener('orientationchange', this.orientationHandler)
            window.removeEventListener('vrdisplaypresentchange', this.vrdisplaypresentchangeHandler)
          }
          CardboardVRDisplay.prototype.updatePresent_ = function () {
            this.endPresent_()
            this.beginPresent_()
          }
          CardboardVRDisplay.prototype.submitFrame = function (pose) {
            if (this.distorter_) {
              this.updateBounds_()
              this.distorter_.submitFrame()
            } else if (this.cardboardUI_ && this.layer_) {
              var canvas = this.layer_.source.getContext('webgl').canvas
              if (canvas.width != this.lastWidth || canvas.height != this.lastHeight) {
                this.cardboardUI_.onResize()
              }
              this.lastWidth = canvas.width
              this.lastHeight = canvas.height
              this.cardboardUI_.render()
            }
          }
          CardboardVRDisplay.prototype.onOrientationChange_ = function (e) {
            this.viewerSelector_.hide()
            if (this.rotateInstructions_) {
              this.rotateInstructions_.update()
            }
            this.onResize_()
          }
          CardboardVRDisplay.prototype.onResize_ = function (e) {
            if (this.layer_) {
              var gl = this.layer_.source.getContext('webgl')
              var cssProperties = ['position: absolute', 'top: 0', 'left: 0',
                'width: 100vw', 'height: 100vh', 'border: 0', 'margin: 0',
                'padding: 0px', 'box-sizing: content-box']
              gl.canvas.setAttribute('style', cssProperties.join('; ') + ';')
              safariCssSizeWorkaround(gl.canvas)
            }
          }
          CardboardVRDisplay.prototype.onViewerChanged_ = function (viewer) {
            this.deviceInfo_.setViewer(viewer)
            if (this.distorter_) {
              this.distorter_.updateDeviceInfo(this.deviceInfo_)
            }
            this.fireVRDisplayDeviceParamsChange_()
          }
          CardboardVRDisplay.prototype.fireVRDisplayDeviceParamsChange_ = function () {
            var event = new CustomEvent('vrdisplaydeviceparamschange', {
              detail: {
                vrdisplay: this,
                deviceInfo: this.deviceInfo_
              }
            })
            window.dispatchEvent(event)
          }
          CardboardVRDisplay.VRFrameData = VRFrameData
          CardboardVRDisplay.VRDisplay = VRDisplay
          return CardboardVRDisplay
        }))
      })
      var CardboardVRDisplay = unwrapExports(cardboardVrDisplay)

      var version = '0.10.6'

      var DefaultConfig = {
        ADDITIONAL_VIEWERS: [],
        DEFAULT_VIEWER: '',
        PROVIDE_MOBILE_VRDISPLAY: true,
        GET_VR_DISPLAYS_TIMEOUT: 1000,
        MOBILE_WAKE_LOCK: true,
        DEBUG: false,
        DPDB_URL: 'https://dpdb.webvr.rocks/dpdb.json',
        K_FILTER: 0.98,
        PREDICTION_TIME_S: 0.040,
        TOUCH_PANNER_DISABLED: true,
        CARDBOARD_UI_DISABLED: false,
        ROTATE_INSTRUCTIONS_DISABLED: false,
        YAW_ONLY: false,
        BUFFER_SCALE: 0.5,
        DIRTY_SUBMIT_FRAME_BINDINGS: false
      }

      function WebVRPolyfill (config) {
        this.config = extend(extend({}, DefaultConfig), config)
        this.polyfillDisplays = []
        this.enabled = false
        this.hasNative = 'getVRDisplays' in navigator
        this.native = {}
        this.native.getVRDisplays = navigator.getVRDisplays
        this.native.VRFrameData = window.VRFrameData
        this.native.VRDisplay = window.VRDisplay
        if (!this.hasNative || this.config.PROVIDE_MOBILE_VRDISPLAY && isMobile()) {
          this.enable()
          this.getVRDisplays().then(function (displays) {
            if (displays && displays[0] && displays[0].fireVRDisplayConnect_) {
              displays[0].fireVRDisplayConnect_()
            }
          })
        }
      }
      WebVRPolyfill.prototype.getPolyfillDisplays = function () {
        if (this._polyfillDisplaysPopulated) {
          return this.polyfillDisplays
        }
        if (isMobile()) {
          var vrDisplay = new CardboardVRDisplay({
            ADDITIONAL_VIEWERS: this.config.ADDITIONAL_VIEWERS,
            DEFAULT_VIEWER: this.config.DEFAULT_VIEWER,
            MOBILE_WAKE_LOCK: this.config.MOBILE_WAKE_LOCK,
            DEBUG: this.config.DEBUG,
            DPDB_URL: this.config.DPDB_URL,
            CARDBOARD_UI_DISABLED: this.config.CARDBOARD_UI_DISABLED,
            K_FILTER: this.config.K_FILTER,
            PREDICTION_TIME_S: this.config.PREDICTION_TIME_S,
            TOUCH_PANNER_DISABLED: this.config.TOUCH_PANNER_DISABLED,
            ROTATE_INSTRUCTIONS_DISABLED: this.config.ROTATE_INSTRUCTIONS_DISABLED,
            YAW_ONLY: this.config.YAW_ONLY,
            BUFFER_SCALE: this.config.BUFFER_SCALE,
            DIRTY_SUBMIT_FRAME_BINDINGS: this.config.DIRTY_SUBMIT_FRAME_BINDINGS
          })
          this.polyfillDisplays.push(vrDisplay)
        }
        this._polyfillDisplaysPopulated = true
        return this.polyfillDisplays
      }
      WebVRPolyfill.prototype.enable = function () {
        this.enabled = true
        if (this.hasNative && this.native.VRFrameData) {
          var NativeVRFrameData = this.native.VRFrameData
          var nativeFrameData = new this.native.VRFrameData()
          var nativeGetFrameData = this.native.VRDisplay.prototype.getFrameData
          window.VRDisplay.prototype.getFrameData = function (frameData) {
            if (frameData instanceof NativeVRFrameData) {
              nativeGetFrameData.call(this, frameData)
              return
            }
            nativeGetFrameData.call(this, nativeFrameData)
            frameData.pose = nativeFrameData.pose
            copyArray(nativeFrameData.leftProjectionMatrix, frameData.leftProjectionMatrix)
            copyArray(nativeFrameData.rightProjectionMatrix, frameData.rightProjectionMatrix)
            copyArray(nativeFrameData.leftViewMatrix, frameData.leftViewMatrix)
            copyArray(nativeFrameData.rightViewMatrix, frameData.rightViewMatrix)
          }
        }
        navigator.getVRDisplays = this.getVRDisplays.bind(this)
        window.VRDisplay = CardboardVRDisplay.VRDisplay
        window.VRFrameData = CardboardVRDisplay.VRFrameData
      }
      WebVRPolyfill.prototype.getVRDisplays = function () {
        var _this = this
        var config = this.config
        if (!this.hasNative) {
          return Promise.resolve(this.getPolyfillDisplays())
        }
        var timeoutId
        var vrDisplaysNative = this.native.getVRDisplays.call(navigator)
        var timeoutPromise = new Promise(function (resolve) {
          timeoutId = setTimeout(function () {
            console.warn('Native WebVR implementation detected, but `getVRDisplays()` failed to resolve. Falling back to polyfill.')
            resolve([])
          }, config.GET_VR_DISPLAYS_TIMEOUT)
        })
        return race([vrDisplaysNative, timeoutPromise]).then(function (nativeDisplays) {
          clearTimeout(timeoutId)
          return nativeDisplays.length > 0 ? nativeDisplays : _this.getPolyfillDisplays()
        })
      }
      WebVRPolyfill.version = version
      WebVRPolyfill.VRFrameData = CardboardVRDisplay.VRFrameData
      WebVRPolyfill.VRDisplay = CardboardVRDisplay.VRDisplay

      var webvrPolyfill = Object.freeze({
  	default: WebVRPolyfill
      })

      var require$$0 = (webvrPolyfill && WebVRPolyfill) || webvrPolyfill

      if (typeof commonjsGlobal$1 !== 'undefined' && commonjsGlobal$1.window) {
        if (!commonjsGlobal$1.document) {
          commonjsGlobal$1.document = commonjsGlobal$1.window.document
        }
        if (!commonjsGlobal$1.navigator) {
          commonjsGlobal$1.navigator = commonjsGlobal$1.window.navigator
        }
      }
      var src = require$$0

      return src
    }))
  })

  var WebVRPolyfill = unwrapExports(webvrPolyfill)

  // Polyfills

  if (Number.EPSILON === undefined) {
  	Number.EPSILON = Math.pow(2, -52)
  }

  if (Number.isInteger === undefined) {
  	// Missing in IE
  	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger

  	Number.isInteger = function (value) {
  		return typeof value === 'number' && isFinite(value) && Math.floor(value) === value
  	}
  }

  //

  if (Math.sign === undefined) {
  	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign

  	Math.sign = function (x) {
  		return (x < 0) ? -1 : (x > 0) ? 1 : +x
  	}
  }

  if ('name' in Function.prototype === false) {
  	// Missing in IE
  	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name

  	Object.defineProperty(Function.prototype, 'name', {

  		get: function () {
  			return this.toString().match(/^\s*function\s*([^\(\s]*)/)[1]
  		}

  	})
  }

  if (Object.assign === undefined) {
  	// Missing in IE
  	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign

  	(function () {
  		Object.assign = function (target) {
  			if (target === undefined || target === null) {
  				throw new TypeError('Cannot convert undefined or null to object')
  			}

  			var output = Object(target)

  			for (var index = 1; index < arguments.length; index++) {
  				var source = arguments[index]

  				if (source !== undefined && source !== null) {
  					for (var nextKey in source) {
  						if (Object.prototype.hasOwnProperty.call(source, nextKey)) {
  							output[nextKey] = source[nextKey]
  						}
  					}
  				}
  			}

  			return output
  		}
  	})()
  }

  /**
   * https://github.com/mrdoob/eventdispatcher.js/
   */

  function EventDispatcher () {}

  Object.assign(EventDispatcher.prototype, {

  	addEventListener: function (type, listener) {
  		if (this._listeners === undefined) this._listeners = {}

  		var listeners = this._listeners

  		if (listeners[type] === undefined) {
  			listeners[type] = []
  		}

  		if (listeners[type].indexOf(listener) === -1) {
  			listeners[type].push(listener)
  		}
  	},

  	hasEventListener: function (type, listener) {
  		if (this._listeners === undefined) return false

  		var listeners = this._listeners

  		return listeners[type] !== undefined && listeners[type].indexOf(listener) !== -1
  	},

  	removeEventListener: function (type, listener) {
  		if (this._listeners === undefined) return

  		var listeners = this._listeners
  		var listenerArray = listeners[type]

  		if (listenerArray !== undefined) {
  			var index = listenerArray.indexOf(listener)

  			if (index !== -1) {
  				listenerArray.splice(index, 1)
  			}
  		}
  	},

  	dispatchEvent: function (event) {
  		if (this._listeners === undefined) return

  		var listeners = this._listeners
  		var listenerArray = listeners[event.type]

  		if (listenerArray !== undefined) {
  			event.target = this

  			var array = listenerArray.slice(0)

  			for (var i = 0, l = array.length; i < l; i++) {
  				array[i].call(this, event)
  			}
  		}
  	}

  })

  var REVISION = '93'
  var MOUSE = { LEFT: 0, MIDDLE: 1, RIGHT: 2 }
  var CullFaceNone = 0
  var CullFaceBack = 1
  var CullFaceFront = 2
  var PCFShadowMap = 1
  var PCFSoftShadowMap = 2
  var FrontSide = 0
  var BackSide = 1
  var DoubleSide = 2
  var FlatShading = 1
  var NoColors = 0
  var FaceColors = 1
  var VertexColors = 2
  var NoBlending = 0
  var NormalBlending = 1
  var AdditiveBlending = 2
  var SubtractiveBlending = 3
  var MultiplyBlending = 4
  var CustomBlending = 5
  var AddEquation = 100
  var SubtractEquation = 101
  var ReverseSubtractEquation = 102
  var MinEquation = 103
  var MaxEquation = 104
  var ZeroFactor = 200
  var OneFactor = 201
  var SrcColorFactor = 202
  var OneMinusSrcColorFactor = 203
  var SrcAlphaFactor = 204
  var OneMinusSrcAlphaFactor = 205
  var DstAlphaFactor = 206
  var OneMinusDstAlphaFactor = 207
  var DstColorFactor = 208
  var OneMinusDstColorFactor = 209
  var SrcAlphaSaturateFactor = 210
  var NeverDepth = 0
  var AlwaysDepth = 1
  var LessDepth = 2
  var LessEqualDepth = 3
  var EqualDepth = 4
  var GreaterEqualDepth = 5
  var GreaterDepth = 6
  var NotEqualDepth = 7
  var MultiplyOperation = 0
  var MixOperation = 1
  var AddOperation = 2
  var NoToneMapping = 0
  var LinearToneMapping = 1
  var ReinhardToneMapping = 2
  var Uncharted2ToneMapping = 3
  var CineonToneMapping = 4
  var UVMapping = 300
  var CubeReflectionMapping = 301
  var CubeRefractionMapping = 302
  var EquirectangularReflectionMapping = 303
  var EquirectangularRefractionMapping = 304
  var SphericalReflectionMapping = 305
  var CubeUVReflectionMapping = 306
  var CubeUVRefractionMapping = 307
  var RepeatWrapping = 1000
  var ClampToEdgeWrapping = 1001
  var MirroredRepeatWrapping = 1002
  var NearestFilter = 1003
  var NearestMipMapNearestFilter = 1004
  var NearestMipMapLinearFilter = 1005
  var LinearFilter = 1006
  var LinearMipMapNearestFilter = 1007
  var LinearMipMapLinearFilter = 1008
  var UnsignedByteType = 1009
  var ByteType = 1010
  var ShortType = 1011
  var UnsignedShortType = 1012
  var IntType = 1013
  var UnsignedIntType = 1014
  var FloatType = 1015
  var HalfFloatType = 1016
  var UnsignedShort4444Type = 1017
  var UnsignedShort5551Type = 1018
  var UnsignedShort565Type = 1019
  var UnsignedInt248Type = 1020
  var AlphaFormat = 1021
  var RGBFormat = 1022
  var RGBAFormat = 1023
  var LuminanceFormat = 1024
  var LuminanceAlphaFormat = 1025
  var DepthFormat = 1026
  var DepthStencilFormat = 1027
  var RGB_S3TC_DXT1_Format = 33776
  var RGBA_S3TC_DXT1_Format = 33777
  var RGBA_S3TC_DXT3_Format = 33778
  var RGBA_S3TC_DXT5_Format = 33779
  var RGB_PVRTC_4BPPV1_Format = 35840
  var RGB_PVRTC_2BPPV1_Format = 35841
  var RGBA_PVRTC_4BPPV1_Format = 35842
  var RGBA_PVRTC_2BPPV1_Format = 35843
  var RGB_ETC1_Format = 36196
  var RGBA_ASTC_4x4_Format = 37808
  var RGBA_ASTC_5x4_Format = 37809
  var RGBA_ASTC_5x5_Format = 37810
  var RGBA_ASTC_6x5_Format = 37811
  var RGBA_ASTC_6x6_Format = 37812
  var RGBA_ASTC_8x5_Format = 37813
  var RGBA_ASTC_8x6_Format = 37814
  var RGBA_ASTC_8x8_Format = 37815
  var RGBA_ASTC_10x5_Format = 37816
  var RGBA_ASTC_10x6_Format = 37817
  var RGBA_ASTC_10x8_Format = 37818
  var RGBA_ASTC_10x10_Format = 37819
  var RGBA_ASTC_12x10_Format = 37820
  var RGBA_ASTC_12x12_Format = 37821
  var LoopOnce = 2200
  var LoopRepeat = 2201
  var LoopPingPong = 2202
  var InterpolateDiscrete = 2300
  var InterpolateLinear = 2301
  var InterpolateSmooth = 2302
  var ZeroCurvatureEnding = 2400
  var ZeroSlopeEnding = 2401
  var WrapAroundEnding = 2402
  var TrianglesDrawMode = 0
  var TriangleStripDrawMode = 1
  var TriangleFanDrawMode = 2
  var LinearEncoding = 3000
  var sRGBEncoding = 3001
  var GammaEncoding = 3007
  var RGBEEncoding = 3002
  var RGBM7Encoding = 3004
  var RGBM16Encoding = 3005
  var RGBDEncoding = 3006
  var BasicDepthPacking = 3200
  var RGBADepthPacking = 3201

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   */

  var _Math = {

  	DEG2RAD: Math.PI / 180,
  	RAD2DEG: 180 / Math.PI,

  	generateUUID: (function () {
  		// http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/21963136#21963136

  		var lut = []

  		for (var i = 0; i < 256; i++) {
  			lut[i] = (i < 16 ? '0' : '') + (i).toString(16)
  		}

  		return function generateUUID () {
  			var d0 = Math.random() * 0xffffffff | 0
  			var d1 = Math.random() * 0xffffffff | 0
  			var d2 = Math.random() * 0xffffffff | 0
  			var d3 = Math.random() * 0xffffffff | 0
  			var uuid = lut[d0 & 0xff] + lut[d0 >> 8 & 0xff] + lut[d0 >> 16 & 0xff] + lut[d0 >> 24 & 0xff] + '-' +
  				lut[d1 & 0xff] + lut[d1 >> 8 & 0xff] + '-' + lut[d1 >> 16 & 0x0f | 0x40] + lut[d1 >> 24 & 0xff] + '-' +
  				lut[d2 & 0x3f | 0x80] + lut[d2 >> 8 & 0xff] + '-' + lut[d2 >> 16 & 0xff] + lut[d2 >> 24 & 0xff] +
  				lut[d3 & 0xff] + lut[d3 >> 8 & 0xff] + lut[d3 >> 16 & 0xff] + lut[d3 >> 24 & 0xff]

  			// .toUpperCase() here flattens concatenated strings to save heap memory space.
  			return uuid.toUpperCase()
  		}
  	})(),

  	clamp: function (value, min, max) {
  		return Math.max(min, Math.min(max, value))
  	},

  	// compute euclidian modulo of m % n
  	// https://en.wikipedia.org/wiki/Modulo_operation

  	euclideanModulo: function (n, m) {
  		return ((n % m) + m) % m
  	},

  	// Linear mapping from range <a1, a2> to range <b1, b2>

  	mapLinear: function (x, a1, a2, b1, b2) {
  		return b1 + (x - a1) * (b2 - b1) / (a2 - a1)
  	},

  	// https://en.wikipedia.org/wiki/Linear_interpolation

  	lerp: function (x, y, t) {
  		return (1 - t) * x + t * y
  	},

  	// http://en.wikipedia.org/wiki/Smoothstep

  	smoothstep: function (x, min, max) {
  		if (x <= min) return 0
  		if (x >= max) return 1

  		x = (x - min) / (max - min)

  		return x * x * (3 - 2 * x)
  	},

  	smootherstep: function (x, min, max) {
  		if (x <= min) return 0
  		if (x >= max) return 1

  		x = (x - min) / (max - min)

  		return x * x * x * (x * (x * 6 - 15) + 10)
  	},

  	// Random integer from <low, high> interval

  	randInt: function (low, high) {
  		return low + Math.floor(Math.random() * (high - low + 1))
  	},

  	// Random float from <low, high> interval

  	randFloat: function (low, high) {
  		return low + Math.random() * (high - low)
  	},

  	// Random float from <-range/2, range/2> interval

  	randFloatSpread: function (range) {
  		return range * (0.5 - Math.random())
  	},

  	degToRad: function (degrees) {
  		return degrees * _Math.DEG2RAD
  	},

  	radToDeg: function (radians) {
  		return radians * _Math.RAD2DEG
  	},

  	isPowerOfTwo: function (value) {
  		return (value & (value - 1)) === 0 && value !== 0
  	},

  	ceilPowerOfTwo: function (value) {
  		return Math.pow(2, Math.ceil(Math.log(value) / Math.LN2))
  	},

  	floorPowerOfTwo: function (value) {
  		return Math.pow(2, Math.floor(Math.log(value) / Math.LN2))
  	}

  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author philogb / http://blog.thejit.org/
   * @author egraether / http://egraether.com/
   * @author zz85 / http://www.lab4games.net/zz85/blog
   */

  function Vector2 (x, y) {
  	this.x = x || 0
  	this.y = y || 0
  }

  Object.defineProperties(Vector2.prototype, {

  	width: {

  		get: function () {
  			return this.x
  		},

  		set: function (value) {
  			this.x = value
  		}

  	},

  	height: {

  		get: function () {
  			return this.y
  		},

  		set: function (value) {
  			this.y = value
  		}

  	}

  })

  Object.assign(Vector2.prototype, {

  	isVector2: true,

  	set: function (x, y) {
  		this.x = x
  		this.y = y

  		return this
  	},

  	setScalar: function (scalar) {
  		this.x = scalar
  		this.y = scalar

  		return this
  	},

  	setX: function (x) {
  		this.x = x

  		return this
  	},

  	setY: function (y) {
  		this.y = y

  		return this
  	},

  	setComponent: function (index, value) {
  		switch (index) {
  			case 0: this.x = value; break
  			case 1: this.y = value; break
  			default: throw new Error('index is out of range: ' + index)
  		}

  		return this
  	},

  	getComponent: function (index) {
  		switch (index) {
  			case 0: return this.x
  			case 1: return this.y
  			default: throw new Error('index is out of range: ' + index)
  		}
  	},

  	clone: function () {
  		return new this.constructor(this.x, this.y)
  	},

  	copy: function (v) {
  		this.x = v.x
  		this.y = v.y

  		return this
  	},

  	add: function (v, w) {
  		if (w !== undefined) {
  			console.warn('THREE.Vector2: .add() now only accepts one argument. Use .addVectors( a, b ) instead.')
  			return this.addVectors(v, w)
  		}

  		this.x += v.x
  		this.y += v.y

  		return this
  	},

  	addScalar: function (s) {
  		this.x += s
  		this.y += s

  		return this
  	},

  	addVectors: function (a, b) {
  		this.x = a.x + b.x
  		this.y = a.y + b.y

  		return this
  	},

  	addScaledVector: function (v, s) {
  		this.x += v.x * s
  		this.y += v.y * s

  		return this
  	},

  	sub: function (v, w) {
  		if (w !== undefined) {
  			console.warn('THREE.Vector2: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.')
  			return this.subVectors(v, w)
  		}

  		this.x -= v.x
  		this.y -= v.y

  		return this
  	},

  	subScalar: function (s) {
  		this.x -= s
  		this.y -= s

  		return this
  	},

  	subVectors: function (a, b) {
  		this.x = a.x - b.x
  		this.y = a.y - b.y

  		return this
  	},

  	multiply: function (v) {
  		this.x *= v.x
  		this.y *= v.y

  		return this
  	},

  	multiplyScalar: function (scalar) {
  		this.x *= scalar
  		this.y *= scalar

  		return this
  	},

  	divide: function (v) {
  		this.x /= v.x
  		this.y /= v.y

  		return this
  	},

  	divideScalar: function (scalar) {
  		return this.multiplyScalar(1 / scalar)
  	},

  	applyMatrix3: function (m) {
  		var x = this.x; var y = this.y
  		var e = m.elements

  		this.x = e[0] * x + e[3] * y + e[6]
  		this.y = e[1] * x + e[4] * y + e[7]

  		return this
  	},

  	min: function (v) {
  		this.x = Math.min(this.x, v.x)
  		this.y = Math.min(this.y, v.y)

  		return this
  	},

  	max: function (v) {
  		this.x = Math.max(this.x, v.x)
  		this.y = Math.max(this.y, v.y)

  		return this
  	},

  	clamp: function (min, max) {
  		// assumes min < max, componentwise

  		this.x = Math.max(min.x, Math.min(max.x, this.x))
  		this.y = Math.max(min.y, Math.min(max.y, this.y))

  		return this
  	},

  	clampScalar: (function () {
  		var min = new Vector2()
  		var max = new Vector2()

  		return function clampScalar (minVal, maxVal) {
  			min.set(minVal, minVal)
  			max.set(maxVal, maxVal)

  			return this.clamp(min, max)
  		}
  	}()),

  	clampLength: function (min, max) {
  		var length = this.length()

  		return this.divideScalar(length || 1).multiplyScalar(Math.max(min, Math.min(max, length)))
  	},

  	floor: function () {
  		this.x = Math.floor(this.x)
  		this.y = Math.floor(this.y)

  		return this
  	},

  	ceil: function () {
  		this.x = Math.ceil(this.x)
  		this.y = Math.ceil(this.y)

  		return this
  	},

  	round: function () {
  		this.x = Math.round(this.x)
  		this.y = Math.round(this.y)

  		return this
  	},

  	roundToZero: function () {
  		this.x = (this.x < 0) ? Math.ceil(this.x) : Math.floor(this.x)
  		this.y = (this.y < 0) ? Math.ceil(this.y) : Math.floor(this.y)

  		return this
  	},

  	negate: function () {
  		this.x = -this.x
  		this.y = -this.y

  		return this
  	},

  	dot: function (v) {
  		return this.x * v.x + this.y * v.y
  	},

  	lengthSq: function () {
  		return this.x * this.x + this.y * this.y
  	},

  	length: function () {
  		return Math.sqrt(this.x * this.x + this.y * this.y)
  	},

  	manhattanLength: function () {
  		return Math.abs(this.x) + Math.abs(this.y)
  	},

  	normalize: function () {
  		return this.divideScalar(this.length() || 1)
  	},

  	angle: function () {
  		// computes the angle in radians with respect to the positive x-axis

  		var angle = Math.atan2(this.y, this.x)

  		if (angle < 0) angle += 2 * Math.PI

  		return angle
  	},

  	distanceTo: function (v) {
  		return Math.sqrt(this.distanceToSquared(v))
  	},

  	distanceToSquared: function (v) {
  		var dx = this.x - v.x; var dy = this.y - v.y
  		return dx * dx + dy * dy
  	},

  	manhattanDistanceTo: function (v) {
  		return Math.abs(this.x - v.x) + Math.abs(this.y - v.y)
  	},

  	setLength: function (length) {
  		return this.normalize().multiplyScalar(length)
  	},

  	lerp: function (v, alpha) {
  		this.x += (v.x - this.x) * alpha
  		this.y += (v.y - this.y) * alpha

  		return this
  	},

  	lerpVectors: function (v1, v2, alpha) {
  		return this.subVectors(v2, v1).multiplyScalar(alpha).add(v1)
  	},

  	equals: function (v) {
  		return ((v.x === this.x) && (v.y === this.y))
  	},

  	fromArray: function (array, offset) {
  		if (offset === undefined) offset = 0

  		this.x = array[offset]
  		this.y = array[offset + 1]

  		return this
  	},

  	toArray: function (array, offset) {
  		if (array === undefined) array = []
  		if (offset === undefined) offset = 0

  		array[offset] = this.x
  		array[offset + 1] = this.y

  		return array
  	},

  	fromBufferAttribute: function (attribute, index, offset) {
  		if (offset !== undefined) {
  			console.warn('THREE.Vector2: offset has been removed from .fromBufferAttribute().')
  		}

  		this.x = attribute.getX(index)
  		this.y = attribute.getY(index)

  		return this
  	},

  	rotateAround: function (center, angle) {
  		var c = Math.cos(angle); var s = Math.sin(angle)

  		var x = this.x - center.x
  		var y = this.y - center.y

  		this.x = x * c - y * s + center.x
  		this.y = x * s + y * c + center.y

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author supereggbert / http://www.paulbrunt.co.uk/
   * @author philogb / http://blog.thejit.org/
   * @author jordi_ros / http://plattsoft.com
   * @author D1plo1d / http://github.com/D1plo1d
   * @author alteredq / http://alteredqualia.com/
   * @author mikael emtinger / http://gomo.se/
   * @author timknip / http://www.floorplanner.com/
   * @author bhouston / http://clara.io
   * @author WestLangley / http://github.com/WestLangley
   */

  function Matrix4 () {
  	this.elements = [

  		1, 0, 0, 0,
  		0, 1, 0, 0,
  		0, 0, 1, 0,
  		0, 0, 0, 1

  	]

  	if (arguments.length > 0) {
  		console.error('THREE.Matrix4: the constructor no longer reads arguments. use .set() instead.')
  	}
  }

  Object.assign(Matrix4.prototype, {

  	isMatrix4: true,

  	set: function (n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44) {
  		var te = this.elements

  		te[0] = n11; te[4] = n12; te[8] = n13; te[12] = n14
  		te[1] = n21; te[5] = n22; te[9] = n23; te[13] = n24
  		te[2] = n31; te[6] = n32; te[10] = n33; te[14] = n34
  		te[3] = n41; te[7] = n42; te[11] = n43; te[15] = n44

  		return this
  	},

  	identity: function () {
  		this.set(

  			1, 0, 0, 0,
  			0, 1, 0, 0,
  			0, 0, 1, 0,
  			0, 0, 0, 1

  		)

  		return this
  	},

  	clone: function () {
  		return new Matrix4().fromArray(this.elements)
  	},

  	copy: function (m) {
  		var te = this.elements
  		var me = m.elements

  		te[0] = me[0]; te[1] = me[1]; te[2] = me[2]; te[3] = me[3]
  		te[4] = me[4]; te[5] = me[5]; te[6] = me[6]; te[7] = me[7]
  		te[8] = me[8]; te[9] = me[9]; te[10] = me[10]; te[11] = me[11]
  		te[12] = me[12]; te[13] = me[13]; te[14] = me[14]; te[15] = me[15]

  		return this
  	},

  	copyPosition: function (m) {
  		var te = this.elements; var me = m.elements

  		te[12] = me[12]
  		te[13] = me[13]
  		te[14] = me[14]

  		return this
  	},

  	extractBasis: function (xAxis, yAxis, zAxis) {
  		xAxis.setFromMatrixColumn(this, 0)
  		yAxis.setFromMatrixColumn(this, 1)
  		zAxis.setFromMatrixColumn(this, 2)

  		return this
  	},

  	makeBasis: function (xAxis, yAxis, zAxis) {
  		this.set(
  			xAxis.x, yAxis.x, zAxis.x, 0,
  			xAxis.y, yAxis.y, zAxis.y, 0,
  			xAxis.z, yAxis.z, zAxis.z, 0,
  			0, 0, 0, 1
  		)

  		return this
  	},

  	extractRotation: (function () {
  		var v1 = new Vector3()

  		return function extractRotation (m) {
  			// this method does not support reflection matrices

  			var te = this.elements
  			var me = m.elements

  			var scaleX = 1 / v1.setFromMatrixColumn(m, 0).length()
  			var scaleY = 1 / v1.setFromMatrixColumn(m, 1).length()
  			var scaleZ = 1 / v1.setFromMatrixColumn(m, 2).length()

  			te[0] = me[0] * scaleX
  			te[1] = me[1] * scaleX
  			te[2] = me[2] * scaleX
  			te[3] = 0

  			te[4] = me[4] * scaleY
  			te[5] = me[5] * scaleY
  			te[6] = me[6] * scaleY
  			te[7] = 0

  			te[8] = me[8] * scaleZ
  			te[9] = me[9] * scaleZ
  			te[10] = me[10] * scaleZ
  			te[11] = 0

  			te[12] = 0
  			te[13] = 0
  			te[14] = 0
  			te[15] = 1

  			return this
  		}
  	}()),

  	makeRotationFromEuler: function (euler) {
  		if (!(euler && euler.isEuler)) {
  			console.error('THREE.Matrix4: .makeRotationFromEuler() now expects a Euler rotation rather than a Vector3 and order.')
  		}

  		var te = this.elements

  		var x = euler.x; var y = euler.y; var z = euler.z
  		var a = Math.cos(x); var b = Math.sin(x)
  		var c = Math.cos(y); var d = Math.sin(y)
  		var e = Math.cos(z); var f = Math.sin(z)

  		if (euler.order === 'XYZ') {
  			var ae = a * e; var af = a * f; var be = b * e; var bf = b * f

  			te[0] = c * e
  			te[4] = -c * f
  			te[8] = d

  			te[1] = af + be * d
  			te[5] = ae - bf * d
  			te[9] = -b * c

  			te[2] = bf - ae * d
  			te[6] = be + af * d
  			te[10] = a * c
  		} else if (euler.order === 'YXZ') {
  			var ce = c * e; var cf = c * f; var de = d * e; var df = d * f

  			te[0] = ce + df * b
  			te[4] = de * b - cf
  			te[8] = a * d

  			te[1] = a * f
  			te[5] = a * e
  			te[9] = -b

  			te[2] = cf * b - de
  			te[6] = df + ce * b
  			te[10] = a * c
  		} else if (euler.order === 'ZXY') {
  			var ce = c * e; var cf = c * f; var de = d * e; var df = d * f

  			te[0] = ce - df * b
  			te[4] = -a * f
  			te[8] = de + cf * b

  			te[1] = cf + de * b
  			te[5] = a * e
  			te[9] = df - ce * b

  			te[2] = -a * d
  			te[6] = b
  			te[10] = a * c
  		} else if (euler.order === 'ZYX') {
  			var ae = a * e; var af = a * f; var be = b * e; var bf = b * f

  			te[0] = c * e
  			te[4] = be * d - af
  			te[8] = ae * d + bf

  			te[1] = c * f
  			te[5] = bf * d + ae
  			te[9] = af * d - be

  			te[2] = -d
  			te[6] = b * c
  			te[10] = a * c
  		} else if (euler.order === 'YZX') {
  			var ac = a * c; var ad = a * d; var bc = b * c; var bd = b * d

  			te[0] = c * e
  			te[4] = bd - ac * f
  			te[8] = bc * f + ad

  			te[1] = f
  			te[5] = a * e
  			te[9] = -b * e

  			te[2] = -d * e
  			te[6] = ad * f + bc
  			te[10] = ac - bd * f
  		} else if (euler.order === 'XZY') {
  			var ac = a * c; var ad = a * d; var bc = b * c; var bd = b * d

  			te[0] = c * e
  			te[4] = -f
  			te[8] = d * e

  			te[1] = ac * f + bd
  			te[5] = a * e
  			te[9] = ad * f - bc

  			te[2] = bc * f - ad
  			te[6] = b * e
  			te[10] = bd * f + ac
  		}

  		// bottom row
  		te[3] = 0
  		te[7] = 0
  		te[11] = 0

  		// last column
  		te[12] = 0
  		te[13] = 0
  		te[14] = 0
  		te[15] = 1

  		return this
  	},

  	makeRotationFromQuaternion: (function () {
  		var zero = new Vector3(0, 0, 0)
  		var one = new Vector3(1, 1, 1)

  		return function makeRotationFromQuaternion (q) {
  			return this.compose(zero, q, one)
  		}
  	}()),

  	lookAt: (function () {
  		var x = new Vector3()
  		var y = new Vector3()
  		var z = new Vector3()

  		return function lookAt (eye, target, up) {
  			var te = this.elements

  			z.subVectors(eye, target)

  			if (z.lengthSq() === 0) {
  				// eye and target are in the same position

  				z.z = 1
  			}

  			z.normalize()
  			x.crossVectors(up, z)

  			if (x.lengthSq() === 0) {
  				// up and z are parallel

  				if (Math.abs(up.z) === 1) {
  					z.x += 0.0001
  				} else {
  					z.z += 0.0001
  				}

  				z.normalize()
  				x.crossVectors(up, z)
  			}

  			x.normalize()
  			y.crossVectors(z, x)

  			te[0] = x.x; te[4] = y.x; te[8] = z.x
  			te[1] = x.y; te[5] = y.y; te[9] = z.y
  			te[2] = x.z; te[6] = y.z; te[10] = z.z

  			return this
  		}
  	}()),

  	multiply: function (m, n) {
  		if (n !== undefined) {
  			console.warn('THREE.Matrix4: .multiply() now only accepts one argument. Use .multiplyMatrices( a, b ) instead.')
  			return this.multiplyMatrices(m, n)
  		}

  		return this.multiplyMatrices(this, m)
  	},

  	premultiply: function (m) {
  		return this.multiplyMatrices(m, this)
  	},

  	multiplyMatrices: function (a, b) {
  		var ae = a.elements
  		var be = b.elements
  		var te = this.elements

  		var a11 = ae[0]; var a12 = ae[4]; var a13 = ae[8]; var a14 = ae[12]
  		var a21 = ae[1]; var a22 = ae[5]; var a23 = ae[9]; var a24 = ae[13]
  		var a31 = ae[2]; var a32 = ae[6]; var a33 = ae[10]; var a34 = ae[14]
  		var a41 = ae[3]; var a42 = ae[7]; var a43 = ae[11]; var a44 = ae[15]

  		var b11 = be[0]; var b12 = be[4]; var b13 = be[8]; var b14 = be[12]
  		var b21 = be[1]; var b22 = be[5]; var b23 = be[9]; var b24 = be[13]
  		var b31 = be[2]; var b32 = be[6]; var b33 = be[10]; var b34 = be[14]
  		var b41 = be[3]; var b42 = be[7]; var b43 = be[11]; var b44 = be[15]

  		te[0] = a11 * b11 + a12 * b21 + a13 * b31 + a14 * b41
  		te[4] = a11 * b12 + a12 * b22 + a13 * b32 + a14 * b42
  		te[8] = a11 * b13 + a12 * b23 + a13 * b33 + a14 * b43
  		te[12] = a11 * b14 + a12 * b24 + a13 * b34 + a14 * b44

  		te[1] = a21 * b11 + a22 * b21 + a23 * b31 + a24 * b41
  		te[5] = a21 * b12 + a22 * b22 + a23 * b32 + a24 * b42
  		te[9] = a21 * b13 + a22 * b23 + a23 * b33 + a24 * b43
  		te[13] = a21 * b14 + a22 * b24 + a23 * b34 + a24 * b44

  		te[2] = a31 * b11 + a32 * b21 + a33 * b31 + a34 * b41
  		te[6] = a31 * b12 + a32 * b22 + a33 * b32 + a34 * b42
  		te[10] = a31 * b13 + a32 * b23 + a33 * b33 + a34 * b43
  		te[14] = a31 * b14 + a32 * b24 + a33 * b34 + a34 * b44

  		te[3] = a41 * b11 + a42 * b21 + a43 * b31 + a44 * b41
  		te[7] = a41 * b12 + a42 * b22 + a43 * b32 + a44 * b42
  		te[11] = a41 * b13 + a42 * b23 + a43 * b33 + a44 * b43
  		te[15] = a41 * b14 + a42 * b24 + a43 * b34 + a44 * b44

  		return this
  	},

  	multiplyScalar: function (s) {
  		var te = this.elements

  		te[0] *= s; te[4] *= s; te[8] *= s; te[12] *= s
  		te[1] *= s; te[5] *= s; te[9] *= s; te[13] *= s
  		te[2] *= s; te[6] *= s; te[10] *= s; te[14] *= s
  		te[3] *= s; te[7] *= s; te[11] *= s; te[15] *= s

  		return this
  	},

  	applyToBufferAttribute: (function () {
  		var v1 = new Vector3()

  		return function applyToBufferAttribute (attribute) {
  			for (var i = 0, l = attribute.count; i < l; i++) {
  				v1.x = attribute.getX(i)
  				v1.y = attribute.getY(i)
  				v1.z = attribute.getZ(i)

  				v1.applyMatrix4(this)

  				attribute.setXYZ(i, v1.x, v1.y, v1.z)
  			}

  			return attribute
  		}
  	}()),

  	determinant: function () {
  		var te = this.elements

  		var n11 = te[0]; var n12 = te[4]; var n13 = te[8]; var n14 = te[12]
  		var n21 = te[1]; var n22 = te[5]; var n23 = te[9]; var n24 = te[13]
  		var n31 = te[2]; var n32 = te[6]; var n33 = te[10]; var n34 = te[14]
  		var n41 = te[3]; var n42 = te[7]; var n43 = te[11]; var n44 = te[15]

  		// TODO: make this more efficient
  		// ( based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm )

  		return (
  			n41 * (
  				+n14 * n23 * n32 -
  				 n13 * n24 * n32 -
  				 n14 * n22 * n33 +
  				 n12 * n24 * n33 +
  				 n13 * n22 * n34 -
  				 n12 * n23 * n34
  			) +
  			n42 * (
  				+n11 * n23 * n34 -
  				 n11 * n24 * n33 +
  				 n14 * n21 * n33 -
  				 n13 * n21 * n34 +
  				 n13 * n24 * n31 -
  				 n14 * n23 * n31
  			) +
  			n43 * (
  				+n11 * n24 * n32 -
  				 n11 * n22 * n34 -
  				 n14 * n21 * n32 +
  				 n12 * n21 * n34 +
  				 n14 * n22 * n31 -
  				 n12 * n24 * n31
  			) +
  			n44 * (
  				-n13 * n22 * n31 -
  				 n11 * n23 * n32 +
  				 n11 * n22 * n33 +
  				 n13 * n21 * n32 -
  				 n12 * n21 * n33 +
  				 n12 * n23 * n31
  			)

  		)
  	},

  	transpose: function () {
  		var te = this.elements
  		var tmp

  		tmp = te[1]; te[1] = te[4]; te[4] = tmp
  		tmp = te[2]; te[2] = te[8]; te[8] = tmp
  		tmp = te[6]; te[6] = te[9]; te[9] = tmp

  		tmp = te[3]; te[3] = te[12]; te[12] = tmp
  		tmp = te[7]; te[7] = te[13]; te[13] = tmp
  		tmp = te[11]; te[11] = te[14]; te[14] = tmp

  		return this
  	},

  	setPosition: function (v) {
  		var te = this.elements

  		te[12] = v.x
  		te[13] = v.y
  		te[14] = v.z

  		return this
  	},

  	getInverse: function (m, throwOnDegenerate) {
  		// based on http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm
  		var te = this.elements
  			var me = m.elements

  			var n11 = me[0]; var n21 = me[1]; var n31 = me[2]; var n41 = me[3]
  			var n12 = me[4]; var n22 = me[5]; var n32 = me[6]; var n42 = me[7]
  			var n13 = me[8]; var n23 = me[9]; var n33 = me[10]; var n43 = me[11]
  			var n14 = me[12]; var n24 = me[13]; var n34 = me[14]; var n44 = me[15]

  			var t11 = n23 * n34 * n42 - n24 * n33 * n42 + n24 * n32 * n43 - n22 * n34 * n43 - n23 * n32 * n44 + n22 * n33 * n44
  			var t12 = n14 * n33 * n42 - n13 * n34 * n42 - n14 * n32 * n43 + n12 * n34 * n43 + n13 * n32 * n44 - n12 * n33 * n44
  			var t13 = n13 * n24 * n42 - n14 * n23 * n42 + n14 * n22 * n43 - n12 * n24 * n43 - n13 * n22 * n44 + n12 * n23 * n44
  			var t14 = n14 * n23 * n32 - n13 * n24 * n32 - n14 * n22 * n33 + n12 * n24 * n33 + n13 * n22 * n34 - n12 * n23 * n34

  		var det = n11 * t11 + n21 * t12 + n31 * t13 + n41 * t14

  		if (det === 0) {
  			var msg = "THREE.Matrix4: .getInverse() can't invert matrix, determinant is 0"

  			if (throwOnDegenerate === true) {
  				throw new Error(msg)
  			} else {
  				console.warn(msg)
  			}

  			return this.identity()
  		}

  		var detInv = 1 / det

  		te[0] = t11 * detInv
  		te[1] = (n24 * n33 * n41 - n23 * n34 * n41 - n24 * n31 * n43 + n21 * n34 * n43 + n23 * n31 * n44 - n21 * n33 * n44) * detInv
  		te[2] = (n22 * n34 * n41 - n24 * n32 * n41 + n24 * n31 * n42 - n21 * n34 * n42 - n22 * n31 * n44 + n21 * n32 * n44) * detInv
  		te[3] = (n23 * n32 * n41 - n22 * n33 * n41 - n23 * n31 * n42 + n21 * n33 * n42 + n22 * n31 * n43 - n21 * n32 * n43) * detInv

  		te[4] = t12 * detInv
  		te[5] = (n13 * n34 * n41 - n14 * n33 * n41 + n14 * n31 * n43 - n11 * n34 * n43 - n13 * n31 * n44 + n11 * n33 * n44) * detInv
  		te[6] = (n14 * n32 * n41 - n12 * n34 * n41 - n14 * n31 * n42 + n11 * n34 * n42 + n12 * n31 * n44 - n11 * n32 * n44) * detInv
  		te[7] = (n12 * n33 * n41 - n13 * n32 * n41 + n13 * n31 * n42 - n11 * n33 * n42 - n12 * n31 * n43 + n11 * n32 * n43) * detInv

  		te[8] = t13 * detInv
  		te[9] = (n14 * n23 * n41 - n13 * n24 * n41 - n14 * n21 * n43 + n11 * n24 * n43 + n13 * n21 * n44 - n11 * n23 * n44) * detInv
  		te[10] = (n12 * n24 * n41 - n14 * n22 * n41 + n14 * n21 * n42 - n11 * n24 * n42 - n12 * n21 * n44 + n11 * n22 * n44) * detInv
  		te[11] = (n13 * n22 * n41 - n12 * n23 * n41 - n13 * n21 * n42 + n11 * n23 * n42 + n12 * n21 * n43 - n11 * n22 * n43) * detInv

  		te[12] = t14 * detInv
  		te[13] = (n13 * n24 * n31 - n14 * n23 * n31 + n14 * n21 * n33 - n11 * n24 * n33 - n13 * n21 * n34 + n11 * n23 * n34) * detInv
  		te[14] = (n14 * n22 * n31 - n12 * n24 * n31 - n14 * n21 * n32 + n11 * n24 * n32 + n12 * n21 * n34 - n11 * n22 * n34) * detInv
  		te[15] = (n12 * n23 * n31 - n13 * n22 * n31 + n13 * n21 * n32 - n11 * n23 * n32 - n12 * n21 * n33 + n11 * n22 * n33) * detInv

  		return this
  	},

  	scale: function (v) {
  		var te = this.elements
  		var x = v.x; var y = v.y; var z = v.z

  		te[0] *= x; te[4] *= y; te[8] *= z
  		te[1] *= x; te[5] *= y; te[9] *= z
  		te[2] *= x; te[6] *= y; te[10] *= z
  		te[3] *= x; te[7] *= y; te[11] *= z

  		return this
  	},

  	getMaxScaleOnAxis: function () {
  		var te = this.elements

  		var scaleXSq = te[0] * te[0] + te[1] * te[1] + te[2] * te[2]
  		var scaleYSq = te[4] * te[4] + te[5] * te[5] + te[6] * te[6]
  		var scaleZSq = te[8] * te[8] + te[9] * te[9] + te[10] * te[10]

  		return Math.sqrt(Math.max(scaleXSq, scaleYSq, scaleZSq))
  	},

  	makeTranslation: function (x, y, z) {
  		this.set(

  			1, 0, 0, x,
  			0, 1, 0, y,
  			0, 0, 1, z,
  			0, 0, 0, 1

  		)

  		return this
  	},

  	makeRotationX: function (theta) {
  		var c = Math.cos(theta); var s = Math.sin(theta)

  		this.set(

  			1, 0, 0, 0,
  			0, c, -s, 0,
  			0, s, c, 0,
  			0, 0, 0, 1

  		)

  		return this
  	},

  	makeRotationY: function (theta) {
  		var c = Math.cos(theta); var s = Math.sin(theta)

  		this.set(

  			 c, 0, s, 0,
  			 0, 1, 0, 0,
  			-s, 0, c, 0,
  			 0, 0, 0, 1

  		)

  		return this
  	},

  	makeRotationZ: function (theta) {
  		var c = Math.cos(theta); var s = Math.sin(theta)

  		this.set(

  			c, -s, 0, 0,
  			s, c, 0, 0,
  			0, 0, 1, 0,
  			0, 0, 0, 1

  		)

  		return this
  	},

  	makeRotationAxis: function (axis, angle) {
  		// Based on http://www.gamedev.net/reference/articles/article1199.asp

  		var c = Math.cos(angle)
  		var s = Math.sin(angle)
  		var t = 1 - c
  		var x = axis.x; var y = axis.y; var z = axis.z
  		var tx = t * x; var ty = t * y

  		this.set(

  			tx * x + c, tx * y - s * z, tx * z + s * y, 0,
  			tx * y + s * z, ty * y + c, ty * z - s * x, 0,
  			tx * z - s * y, ty * z + s * x, t * z * z + c, 0,
  			0, 0, 0, 1

  		)

  		 return this
  	},

  	makeScale: function (x, y, z) {
  		this.set(

  			x, 0, 0, 0,
  			0, y, 0, 0,
  			0, 0, z, 0,
  			0, 0, 0, 1

  		)

  		return this
  	},

  	makeShear: function (x, y, z) {
  		this.set(

  			1, y, z, 0,
  			x, 1, z, 0,
  			x, y, 1, 0,
  			0, 0, 0, 1

  		)

  		return this
  	},

  	compose: function (position, quaternion, scale) {
  		var te = this.elements

  		var x = quaternion._x; var y = quaternion._y; var z = quaternion._z; var w = quaternion._w
  		var x2 = x + x; var	y2 = y + y; var z2 = z + z
  		var xx = x * x2; var xy = x * y2; var xz = x * z2
  		var yy = y * y2; var yz = y * z2; var zz = z * z2
  		var wx = w * x2; var wy = w * y2; var wz = w * z2

  		var sx = scale.x; var sy = scale.y; var sz = scale.z

  	        te[0] = (1 - (yy + zz)) * sx
  	        te[1] = (xy + wz) * sx
  	        te[2] = (xz - wy) * sx
  	        te[3] = 0

  	        te[4] = (xy - wz) * sy
  	        te[5] = (1 - (xx + zz)) * sy
  	        te[6] = (yz + wx) * sy
  	        te[7] = 0

  	        te[8] = (xz + wy) * sz
  	        te[9] = (yz - wx) * sz
  	        te[10] = (1 - (xx + yy)) * sz
  	        te[11] = 0

  	        te[12] = position.x
  	        te[13] = position.y
  	        te[14] = position.z
  	        te[15] = 1

  	        return this
  	},

  	decompose: (function () {
  		var vector = new Vector3()
  		var matrix = new Matrix4()

  		return function decompose (position, quaternion, scale) {
  			var te = this.elements

  			var sx = vector.set(te[0], te[1], te[2]).length()
  			var sy = vector.set(te[4], te[5], te[6]).length()
  			var sz = vector.set(te[8], te[9], te[10]).length()

  			// if determine is negative, we need to invert one scale
  			var det = this.determinant()
  			if (det < 0) sx = -sx

  			position.x = te[12]
  			position.y = te[13]
  			position.z = te[14]

  			// scale the rotation part
  			matrix.copy(this)

  			var invSX = 1 / sx
  			var invSY = 1 / sy
  			var invSZ = 1 / sz

  			matrix.elements[0] *= invSX
  			matrix.elements[1] *= invSX
  			matrix.elements[2] *= invSX

  			matrix.elements[4] *= invSY
  			matrix.elements[5] *= invSY
  			matrix.elements[6] *= invSY

  			matrix.elements[8] *= invSZ
  			matrix.elements[9] *= invSZ
  			matrix.elements[10] *= invSZ

  			quaternion.setFromRotationMatrix(matrix)

  			scale.x = sx
  			scale.y = sy
  			scale.z = sz

  			return this
  		}
  	}()),

  	makePerspective: function (left, right, top, bottom, near, far) {
  		if (far === undefined) {
  			console.warn('THREE.Matrix4: .makePerspective() has been redefined and has a new signature. Please check the docs.')
  		}

  		var te = this.elements
  		var x = 2 * near / (right - left)
  		var y = 2 * near / (top - bottom)

  		var a = (right + left) / (right - left)
  		var b = (top + bottom) / (top - bottom)
  		var c = -(far + near) / (far - near)
  		var d = -2 * far * near / (far - near)

  		te[0] = x;	te[4] = 0;	te[8] = a;	te[12] = 0
  		te[1] = 0;	te[5] = y;	te[9] = b;	te[13] = 0
  		te[2] = 0;	te[6] = 0;	te[10] = c;	te[14] = d
  		te[3] = 0;	te[7] = 0;	te[11] = -1;	te[15] = 0

  		return this
  	},

  	makeOrthographic: function (left, right, top, bottom, near, far) {
  		var te = this.elements
  		var w = 1.0 / (right - left)
  		var h = 1.0 / (top - bottom)
  		var p = 1.0 / (far - near)

  		var x = (right + left) * w
  		var y = (top + bottom) * h
  		var z = (far + near) * p

  		te[0] = 2 * w;	te[4] = 0;	te[8] = 0;	te[12] = -x
  		te[1] = 0;	te[5] = 2 * h;	te[9] = 0;	te[13] = -y
  		te[2] = 0;	te[6] = 0;	te[10] = -2 * p;	te[14] = -z
  		te[3] = 0;	te[7] = 0;	te[11] = 0;	te[15] = 1

  		return this
  	},

  	equals: function (matrix) {
  		var te = this.elements
  		var me = matrix.elements

  		for (var i = 0; i < 16; i++) {
  			if (te[i] !== me[i]) return false
  		}

  		return true
  	},

  	fromArray: function (array, offset) {
  		if (offset === undefined) offset = 0

  		for (var i = 0; i < 16; i++) {
  			this.elements[i] = array[i + offset]
  		}

  		return this
  	},

  	toArray: function (array, offset) {
  		if (array === undefined) array = []
  		if (offset === undefined) offset = 0

  		var te = this.elements

  		array[offset] = te[0]
  		array[offset + 1] = te[1]
  		array[offset + 2] = te[2]
  		array[offset + 3] = te[3]

  		array[offset + 4] = te[4]
  		array[offset + 5] = te[5]
  		array[offset + 6] = te[6]
  		array[offset + 7] = te[7]

  		array[offset + 8] = te[8]
  		array[offset + 9] = te[9]
  		array[offset + 10] = te[10]
  		array[offset + 11] = te[11]

  		array[offset + 12] = te[12]
  		array[offset + 13] = te[13]
  		array[offset + 14] = te[14]
  		array[offset + 15] = te[15]

  		return array
  	}

  })

  /**
   * @author mikael emtinger / http://gomo.se/
   * @author alteredq / http://alteredqualia.com/
   * @author WestLangley / http://github.com/WestLangley
   * @author bhouston / http://clara.io
   */

  function Quaternion (x, y, z, w) {
  	this._x = x || 0
  	this._y = y || 0
  	this._z = z || 0
  	this._w = (w !== undefined) ? w : 1
  }

  Object.assign(Quaternion, {

  	slerp: function (qa, qb, qm, t) {
  		return qm.copy(qa).slerp(qb, t)
  	},

  	slerpFlat: function (dst, dstOffset, src0, srcOffset0, src1, srcOffset1, t) {
  		// fuzz-free, array-based Quaternion SLERP operation

  		var x0 = src0[srcOffset0 + 0]
  			var y0 = src0[srcOffset0 + 1]
  			var z0 = src0[srcOffset0 + 2]
  			var w0 = src0[srcOffset0 + 3]

  			var x1 = src1[srcOffset1 + 0]
  			var y1 = src1[srcOffset1 + 1]
  			var z1 = src1[srcOffset1 + 2]
  			var w1 = src1[srcOffset1 + 3]

  		if (w0 !== w1 || x0 !== x1 || y0 !== y1 || z0 !== z1) {
  			var s = 1 - t

  				var cos = x0 * x1 + y0 * y1 + z0 * z1 + w0 * w1

  				var dir = (cos >= 0 ? 1 : -1)
  				var sqrSin = 1 - cos * cos

  			// Skip the Slerp for tiny steps to avoid numeric problems:
  			if (sqrSin > Number.EPSILON) {
  				var sin = Math.sqrt(sqrSin)
  					var len = Math.atan2(sin, cos * dir)

  				s = Math.sin(s * len) / sin
  				t = Math.sin(t * len) / sin
  			}

  			var tDir = t * dir

  			x0 = x0 * s + x1 * tDir
  			y0 = y0 * s + y1 * tDir
  			z0 = z0 * s + z1 * tDir
  			w0 = w0 * s + w1 * tDir

  			// Normalize in case we just did a lerp:
  			if (s === 1 - t) {
  				var f = 1 / Math.sqrt(x0 * x0 + y0 * y0 + z0 * z0 + w0 * w0)

  				x0 *= f
  				y0 *= f
  				z0 *= f
  				w0 *= f
  			}
  		}

  		dst[dstOffset] = x0
  		dst[dstOffset + 1] = y0
  		dst[dstOffset + 2] = z0
  		dst[dstOffset + 3] = w0
  	}

  })

  Object.defineProperties(Quaternion.prototype, {

  	x: {

  		get: function () {
  			return this._x
  		},

  		set: function (value) {
  			this._x = value
  			this.onChangeCallback()
  		}

  	},

  	y: {

  		get: function () {
  			return this._y
  		},

  		set: function (value) {
  			this._y = value
  			this.onChangeCallback()
  		}

  	},

  	z: {

  		get: function () {
  			return this._z
  		},

  		set: function (value) {
  			this._z = value
  			this.onChangeCallback()
  		}

  	},

  	w: {

  		get: function () {
  			return this._w
  		},

  		set: function (value) {
  			this._w = value
  			this.onChangeCallback()
  		}

  	}

  })

  Object.assign(Quaternion.prototype, {

  	set: function (x, y, z, w) {
  		this._x = x
  		this._y = y
  		this._z = z
  		this._w = w

  		this.onChangeCallback()

  		return this
  	},

  	clone: function () {
  		return new this.constructor(this._x, this._y, this._z, this._w)
  	},

  	copy: function (quaternion) {
  		this._x = quaternion.x
  		this._y = quaternion.y
  		this._z = quaternion.z
  		this._w = quaternion.w

  		this.onChangeCallback()

  		return this
  	},

  	setFromEuler: function (euler, update) {
  		if (!(euler && euler.isEuler)) {
  			throw new Error('THREE.Quaternion: .setFromEuler() now expects an Euler rotation rather than a Vector3 and order.')
  		}

  		var x = euler._x; var y = euler._y; var z = euler._z; var order = euler.order

  		// http://www.mathworks.com/matlabcentral/fileexchange/
  		// 	20696-function-to-convert-between-dcm-euler-angles-quaternions-and-euler-vectors/
  		//	content/SpinCalc.m

  		var cos = Math.cos
  		var sin = Math.sin

  		var c1 = cos(x / 2)
  		var c2 = cos(y / 2)
  		var c3 = cos(z / 2)

  		var s1 = sin(x / 2)
  		var s2 = sin(y / 2)
  		var s3 = sin(z / 2)

  		if (order === 'XYZ') {
  			this._x = s1 * c2 * c3 + c1 * s2 * s3
  			this._y = c1 * s2 * c3 - s1 * c2 * s3
  			this._z = c1 * c2 * s3 + s1 * s2 * c3
  			this._w = c1 * c2 * c3 - s1 * s2 * s3
  		} else if (order === 'YXZ') {
  			this._x = s1 * c2 * c3 + c1 * s2 * s3
  			this._y = c1 * s2 * c3 - s1 * c2 * s3
  			this._z = c1 * c2 * s3 - s1 * s2 * c3
  			this._w = c1 * c2 * c3 + s1 * s2 * s3
  		} else if (order === 'ZXY') {
  			this._x = s1 * c2 * c3 - c1 * s2 * s3
  			this._y = c1 * s2 * c3 + s1 * c2 * s3
  			this._z = c1 * c2 * s3 + s1 * s2 * c3
  			this._w = c1 * c2 * c3 - s1 * s2 * s3
  		} else if (order === 'ZYX') {
  			this._x = s1 * c2 * c3 - c1 * s2 * s3
  			this._y = c1 * s2 * c3 + s1 * c2 * s3
  			this._z = c1 * c2 * s3 - s1 * s2 * c3
  			this._w = c1 * c2 * c3 + s1 * s2 * s3
  		} else if (order === 'YZX') {
  			this._x = s1 * c2 * c3 + c1 * s2 * s3
  			this._y = c1 * s2 * c3 + s1 * c2 * s3
  			this._z = c1 * c2 * s3 - s1 * s2 * c3
  			this._w = c1 * c2 * c3 - s1 * s2 * s3
  		} else if (order === 'XZY') {
  			this._x = s1 * c2 * c3 - c1 * s2 * s3
  			this._y = c1 * s2 * c3 - s1 * c2 * s3
  			this._z = c1 * c2 * s3 + s1 * s2 * c3
  			this._w = c1 * c2 * c3 + s1 * s2 * s3
  		}

  		if (update !== false) this.onChangeCallback()

  		return this
  	},

  	setFromAxisAngle: function (axis, angle) {
  		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/angleToQuaternion/index.htm

  		// assumes axis is normalized

  		var halfAngle = angle / 2; var s = Math.sin(halfAngle)

  		this._x = axis.x * s
  		this._y = axis.y * s
  		this._z = axis.z * s
  		this._w = Math.cos(halfAngle)

  		this.onChangeCallback()

  		return this
  	},

  	setFromRotationMatrix: function (m) {
  		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/index.htm

  		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

  		var te = m.elements

  			var m11 = te[0]; var m12 = te[4]; var m13 = te[8]
  			var m21 = te[1]; var m22 = te[5]; var m23 = te[9]
  			var m31 = te[2]; var m32 = te[6]; var m33 = te[10]

  			var trace = m11 + m22 + m33
  			var s

  		if (trace > 0) {
  			s = 0.5 / Math.sqrt(trace + 1.0)

  			this._w = 0.25 / s
  			this._x = (m32 - m23) * s
  			this._y = (m13 - m31) * s
  			this._z = (m21 - m12) * s
  		} else if (m11 > m22 && m11 > m33) {
  			s = 2.0 * Math.sqrt(1.0 + m11 - m22 - m33)

  			this._w = (m32 - m23) / s
  			this._x = 0.25 * s
  			this._y = (m12 + m21) / s
  			this._z = (m13 + m31) / s
  		} else if (m22 > m33) {
  			s = 2.0 * Math.sqrt(1.0 + m22 - m11 - m33)

  			this._w = (m13 - m31) / s
  			this._x = (m12 + m21) / s
  			this._y = 0.25 * s
  			this._z = (m23 + m32) / s
  		} else {
  			s = 2.0 * Math.sqrt(1.0 + m33 - m11 - m22)

  			this._w = (m21 - m12) / s
  			this._x = (m13 + m31) / s
  			this._y = (m23 + m32) / s
  			this._z = 0.25 * s
  		}

  		this.onChangeCallback()

  		return this
  	},

  	setFromUnitVectors: (function () {
  		// assumes direction vectors vFrom and vTo are normalized

  		var v1 = new Vector3()
  		var r

  		var EPS = 0.000001

  		return function setFromUnitVectors (vFrom, vTo) {
  			if (v1 === undefined) v1 = new Vector3()

  			r = vFrom.dot(vTo) + 1

  			if (r < EPS) {
  				r = 0

  				if (Math.abs(vFrom.x) > Math.abs(vFrom.z)) {
  					v1.set(-vFrom.y, vFrom.x, 0)
  				} else {
  					v1.set(0, -vFrom.z, vFrom.y)
  				}
  			} else {
  				v1.crossVectors(vFrom, vTo)
  			}

  			this._x = v1.x
  			this._y = v1.y
  			this._z = v1.z
  			this._w = r

  			return this.normalize()
  		}
  	}()),

  	inverse: function () {
  		// quaternion is assumed to have unit length

  		return this.conjugate()
  	},

  	conjugate: function () {
  		this._x *= -1
  		this._y *= -1
  		this._z *= -1

  		this.onChangeCallback()

  		return this
  	},

  	dot: function (v) {
  		return this._x * v._x + this._y * v._y + this._z * v._z + this._w * v._w
  	},

  	lengthSq: function () {
  		return this._x * this._x + this._y * this._y + this._z * this._z + this._w * this._w
  	},

  	length: function () {
  		return Math.sqrt(this._x * this._x + this._y * this._y + this._z * this._z + this._w * this._w)
  	},

  	normalize: function () {
  		var l = this.length()

  		if (l === 0) {
  			this._x = 0
  			this._y = 0
  			this._z = 0
  			this._w = 1
  		} else {
  			l = 1 / l

  			this._x = this._x * l
  			this._y = this._y * l
  			this._z = this._z * l
  			this._w = this._w * l
  		}

  		this.onChangeCallback()

  		return this
  	},

  	multiply: function (q, p) {
  		if (p !== undefined) {
  			console.warn('THREE.Quaternion: .multiply() now only accepts one argument. Use .multiplyQuaternions( a, b ) instead.')
  			return this.multiplyQuaternions(q, p)
  		}

  		return this.multiplyQuaternions(this, q)
  	},

  	premultiply: function (q) {
  		return this.multiplyQuaternions(q, this)
  	},

  	multiplyQuaternions: function (a, b) {
  		// from http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/code/index.htm

  		var qax = a._x; var qay = a._y; var qaz = a._z; var qaw = a._w
  		var qbx = b._x; var qby = b._y; var qbz = b._z; var qbw = b._w

  		this._x = qax * qbw + qaw * qbx + qay * qbz - qaz * qby
  		this._y = qay * qbw + qaw * qby + qaz * qbx - qax * qbz
  		this._z = qaz * qbw + qaw * qbz + qax * qby - qay * qbx
  		this._w = qaw * qbw - qax * qbx - qay * qby - qaz * qbz

  		this.onChangeCallback()

  		return this
  	},

  	slerp: function (qb, t) {
  		if (t === 0) return this
  		if (t === 1) return this.copy(qb)

  		var x = this._x; var y = this._y; var z = this._z; var w = this._w

  		// http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/slerp/

  		var cosHalfTheta = w * qb._w + x * qb._x + y * qb._y + z * qb._z

  		if (cosHalfTheta < 0) {
  			this._w = -qb._w
  			this._x = -qb._x
  			this._y = -qb._y
  			this._z = -qb._z

  			cosHalfTheta = -cosHalfTheta
  		} else {
  			this.copy(qb)
  		}

  		if (cosHalfTheta >= 1.0) {
  			this._w = w
  			this._x = x
  			this._y = y
  			this._z = z

  			return this
  		}

  		var sinHalfTheta = Math.sqrt(1.0 - cosHalfTheta * cosHalfTheta)

  		if (Math.abs(sinHalfTheta) < 0.001) {
  			this._w = 0.5 * (w + this._w)
  			this._x = 0.5 * (x + this._x)
  			this._y = 0.5 * (y + this._y)
  			this._z = 0.5 * (z + this._z)

  			return this
  		}

  		var halfTheta = Math.atan2(sinHalfTheta, cosHalfTheta)
  		var ratioA = Math.sin((1 - t) * halfTheta) / sinHalfTheta
  			var ratioB = Math.sin(t * halfTheta) / sinHalfTheta

  		this._w = (w * ratioA + this._w * ratioB)
  		this._x = (x * ratioA + this._x * ratioB)
  		this._y = (y * ratioA + this._y * ratioB)
  		this._z = (z * ratioA + this._z * ratioB)

  		this.onChangeCallback()

  		return this
  	},

  	equals: function (quaternion) {
  		return (quaternion._x === this._x) && (quaternion._y === this._y) && (quaternion._z === this._z) && (quaternion._w === this._w)
  	},

  	fromArray: function (array, offset) {
  		if (offset === undefined) offset = 0

  		this._x = array[offset]
  		this._y = array[offset + 1]
  		this._z = array[offset + 2]
  		this._w = array[offset + 3]

  		this.onChangeCallback()

  		return this
  	},

  	toArray: function (array, offset) {
  		if (array === undefined) array = []
  		if (offset === undefined) offset = 0

  		array[offset] = this._x
  		array[offset + 1] = this._y
  		array[offset + 2] = this._z
  		array[offset + 3] = this._w

  		return array
  	},

  	onChange: function (callback) {
  		this.onChangeCallback = callback

  		return this
  	},

  	onChangeCallback: function () {}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author kile / http://kile.stravaganza.org/
   * @author philogb / http://blog.thejit.org/
   * @author mikael emtinger / http://gomo.se/
   * @author egraether / http://egraether.com/
   * @author WestLangley / http://github.com/WestLangley
   */

  function Vector3 (x, y, z) {
  	this.x = x || 0
  	this.y = y || 0
  	this.z = z || 0
  }

  Object.assign(Vector3.prototype, {

  	isVector3: true,

  	set: function (x, y, z) {
  		this.x = x
  		this.y = y
  		this.z = z

  		return this
  	},

  	setScalar: function (scalar) {
  		this.x = scalar
  		this.y = scalar
  		this.z = scalar

  		return this
  	},

  	setX: function (x) {
  		this.x = x

  		return this
  	},

  	setY: function (y) {
  		this.y = y

  		return this
  	},

  	setZ: function (z) {
  		this.z = z

  		return this
  	},

  	setComponent: function (index, value) {
  		switch (index) {
  			case 0: this.x = value; break
  			case 1: this.y = value; break
  			case 2: this.z = value; break
  			default: throw new Error('index is out of range: ' + index)
  		}

  		return this
  	},

  	getComponent: function (index) {
  		switch (index) {
  			case 0: return this.x
  			case 1: return this.y
  			case 2: return this.z
  			default: throw new Error('index is out of range: ' + index)
  		}
  	},

  	clone: function () {
  		return new this.constructor(this.x, this.y, this.z)
  	},

  	copy: function (v) {
  		this.x = v.x
  		this.y = v.y
  		this.z = v.z

  		return this
  	},

  	add: function (v, w) {
  		if (w !== undefined) {
  			console.warn('THREE.Vector3: .add() now only accepts one argument. Use .addVectors( a, b ) instead.')
  			return this.addVectors(v, w)
  		}

  		this.x += v.x
  		this.y += v.y
  		this.z += v.z

  		return this
  	},

  	addScalar: function (s) {
  		this.x += s
  		this.y += s
  		this.z += s

  		return this
  	},

  	addVectors: function (a, b) {
  		this.x = a.x + b.x
  		this.y = a.y + b.y
  		this.z = a.z + b.z

  		return this
  	},

  	addScaledVector: function (v, s) {
  		this.x += v.x * s
  		this.y += v.y * s
  		this.z += v.z * s

  		return this
  	},

  	sub: function (v, w) {
  		if (w !== undefined) {
  			console.warn('THREE.Vector3: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.')
  			return this.subVectors(v, w)
  		}

  		this.x -= v.x
  		this.y -= v.y
  		this.z -= v.z

  		return this
  	},

  	subScalar: function (s) {
  		this.x -= s
  		this.y -= s
  		this.z -= s

  		return this
  	},

  	subVectors: function (a, b) {
  		this.x = a.x - b.x
  		this.y = a.y - b.y
  		this.z = a.z - b.z

  		return this
  	},

  	multiply: function (v, w) {
  		if (w !== undefined) {
  			console.warn('THREE.Vector3: .multiply() now only accepts one argument. Use .multiplyVectors( a, b ) instead.')
  			return this.multiplyVectors(v, w)
  		}

  		this.x *= v.x
  		this.y *= v.y
  		this.z *= v.z

  		return this
  	},

  	multiplyScalar: function (scalar) {
  		this.x *= scalar
  		this.y *= scalar
  		this.z *= scalar

  		return this
  	},

  	multiplyVectors: function (a, b) {
  		this.x = a.x * b.x
  		this.y = a.y * b.y
  		this.z = a.z * b.z

  		return this
  	},

  	applyEuler: (function () {
  		var quaternion = new Quaternion()

  		return function applyEuler (euler) {
  			if (!(euler && euler.isEuler)) {
  				console.error('THREE.Vector3: .applyEuler() now expects an Euler rotation rather than a Vector3 and order.')
  			}

  			return this.applyQuaternion(quaternion.setFromEuler(euler))
  		}
  	}()),

  	applyAxisAngle: (function () {
  		var quaternion = new Quaternion()

  		return function applyAxisAngle (axis, angle) {
  			return this.applyQuaternion(quaternion.setFromAxisAngle(axis, angle))
  		}
  	}()),

  	applyMatrix3: function (m) {
  		var x = this.x; var y = this.y; var z = this.z
  		var e = m.elements

  		this.x = e[0] * x + e[3] * y + e[6] * z
  		this.y = e[1] * x + e[4] * y + e[7] * z
  		this.z = e[2] * x + e[5] * y + e[8] * z

  		return this
  	},

  	applyMatrix4: function (m) {
  		var x = this.x; var y = this.y; var z = this.z
  		var e = m.elements

  		var w = 1 / (e[3] * x + e[7] * y + e[11] * z + e[15])

  		this.x = (e[0] * x + e[4] * y + e[8] * z + e[12]) * w
  		this.y = (e[1] * x + e[5] * y + e[9] * z + e[13]) * w
  		this.z = (e[2] * x + e[6] * y + e[10] * z + e[14]) * w

  		return this
  	},

  	applyQuaternion: function (q) {
  		var x = this.x; var y = this.y; var z = this.z
  		var qx = q.x; var qy = q.y; var qz = q.z; var qw = q.w

  		// calculate quat * vector

  		var ix = qw * x + qy * z - qz * y
  		var iy = qw * y + qz * x - qx * z
  		var iz = qw * z + qx * y - qy * x
  		var iw = -qx * x - qy * y - qz * z

  		// calculate result * inverse quat

  		this.x = ix * qw + iw * -qx + iy * -qz - iz * -qy
  		this.y = iy * qw + iw * -qy + iz * -qx - ix * -qz
  		this.z = iz * qw + iw * -qz + ix * -qy - iy * -qx

  		return this
  	},

  	project: (function () {
  		var matrix = new Matrix4()

  		return function project (camera) {
  			matrix.multiplyMatrices(camera.projectionMatrix, matrix.getInverse(camera.matrixWorld))
  			return this.applyMatrix4(matrix)
  		}
  	}()),

  	unproject: (function () {
  		var matrix = new Matrix4()

  		return function unproject (camera) {
  			matrix.multiplyMatrices(camera.matrixWorld, matrix.getInverse(camera.projectionMatrix))
  			return this.applyMatrix4(matrix)
  		}
  	}()),

  	transformDirection: function (m) {
  		// input: THREE.Matrix4 affine matrix
  		// vector interpreted as a direction

  		var x = this.x; var y = this.y; var z = this.z
  		var e = m.elements

  		this.x = e[0] * x + e[4] * y + e[8] * z
  		this.y = e[1] * x + e[5] * y + e[9] * z
  		this.z = e[2] * x + e[6] * y + e[10] * z

  		return this.normalize()
  	},

  	divide: function (v) {
  		this.x /= v.x
  		this.y /= v.y
  		this.z /= v.z

  		return this
  	},

  	divideScalar: function (scalar) {
  		return this.multiplyScalar(1 / scalar)
  	},

  	min: function (v) {
  		this.x = Math.min(this.x, v.x)
  		this.y = Math.min(this.y, v.y)
  		this.z = Math.min(this.z, v.z)

  		return this
  	},

  	max: function (v) {
  		this.x = Math.max(this.x, v.x)
  		this.y = Math.max(this.y, v.y)
  		this.z = Math.max(this.z, v.z)

  		return this
  	},

  	clamp: function (min, max) {
  		// assumes min < max, componentwise

  		this.x = Math.max(min.x, Math.min(max.x, this.x))
  		this.y = Math.max(min.y, Math.min(max.y, this.y))
  		this.z = Math.max(min.z, Math.min(max.z, this.z))

  		return this
  	},

  	clampScalar: (function () {
  		var min = new Vector3()
  		var max = new Vector3()

  		return function clampScalar (minVal, maxVal) {
  			min.set(minVal, minVal, minVal)
  			max.set(maxVal, maxVal, maxVal)

  			return this.clamp(min, max)
  		}
  	}()),

  	clampLength: function (min, max) {
  		var length = this.length()

  		return this.divideScalar(length || 1).multiplyScalar(Math.max(min, Math.min(max, length)))
  	},

  	floor: function () {
  		this.x = Math.floor(this.x)
  		this.y = Math.floor(this.y)
  		this.z = Math.floor(this.z)

  		return this
  	},

  	ceil: function () {
  		this.x = Math.ceil(this.x)
  		this.y = Math.ceil(this.y)
  		this.z = Math.ceil(this.z)

  		return this
  	},

  	round: function () {
  		this.x = Math.round(this.x)
  		this.y = Math.round(this.y)
  		this.z = Math.round(this.z)

  		return this
  	},

  	roundToZero: function () {
  		this.x = (this.x < 0) ? Math.ceil(this.x) : Math.floor(this.x)
  		this.y = (this.y < 0) ? Math.ceil(this.y) : Math.floor(this.y)
  		this.z = (this.z < 0) ? Math.ceil(this.z) : Math.floor(this.z)

  		return this
  	},

  	negate: function () {
  		this.x = -this.x
  		this.y = -this.y
  		this.z = -this.z

  		return this
  	},

  	dot: function (v) {
  		return this.x * v.x + this.y * v.y + this.z * v.z
  	},

  	// TODO lengthSquared?

  	lengthSq: function () {
  		return this.x * this.x + this.y * this.y + this.z * this.z
  	},

  	length: function () {
  		return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z)
  	},

  	manhattanLength: function () {
  		return Math.abs(this.x) + Math.abs(this.y) + Math.abs(this.z)
  	},

  	normalize: function () {
  		return this.divideScalar(this.length() || 1)
  	},

  	setLength: function (length) {
  		return this.normalize().multiplyScalar(length)
  	},

  	lerp: function (v, alpha) {
  		this.x += (v.x - this.x) * alpha
  		this.y += (v.y - this.y) * alpha
  		this.z += (v.z - this.z) * alpha

  		return this
  	},

  	lerpVectors: function (v1, v2, alpha) {
  		return this.subVectors(v2, v1).multiplyScalar(alpha).add(v1)
  	},

  	cross: function (v, w) {
  		if (w !== undefined) {
  			console.warn('THREE.Vector3: .cross() now only accepts one argument. Use .crossVectors( a, b ) instead.')
  			return this.crossVectors(v, w)
  		}

  		return this.crossVectors(this, v)
  	},

  	crossVectors: function (a, b) {
  		var ax = a.x; var ay = a.y; var az = a.z
  		var bx = b.x; var by = b.y; var bz = b.z

  		this.x = ay * bz - az * by
  		this.y = az * bx - ax * bz
  		this.z = ax * by - ay * bx

  		return this
  	},

  	projectOnVector: function (vector) {
  		var scalar = vector.dot(this) / vector.lengthSq()

  		return this.copy(vector).multiplyScalar(scalar)
  	},

  	projectOnPlane: (function () {
  		var v1 = new Vector3()

  		return function projectOnPlane (planeNormal) {
  			v1.copy(this).projectOnVector(planeNormal)

  			return this.sub(v1)
  		}
  	}()),

  	reflect: (function () {
  		// reflect incident vector off plane orthogonal to normal
  		// normal is assumed to have unit length

  		var v1 = new Vector3()

  		return function reflect (normal) {
  			return this.sub(v1.copy(normal).multiplyScalar(2 * this.dot(normal)))
  		}
  	}()),

  	angleTo: function (v) {
  		var theta = this.dot(v) / (Math.sqrt(this.lengthSq() * v.lengthSq()))

  		// clamp, to handle numerical problems

  		return Math.acos(_Math.clamp(theta, -1, 1))
  	},

  	distanceTo: function (v) {
  		return Math.sqrt(this.distanceToSquared(v))
  	},

  	distanceToSquared: function (v) {
  		var dx = this.x - v.x; var dy = this.y - v.y; var dz = this.z - v.z

  		return dx * dx + dy * dy + dz * dz
  	},

  	manhattanDistanceTo: function (v) {
  		return Math.abs(this.x - v.x) + Math.abs(this.y - v.y) + Math.abs(this.z - v.z)
  	},

  	setFromSpherical: function (s) {
  		var sinPhiRadius = Math.sin(s.phi) * s.radius

  		this.x = sinPhiRadius * Math.sin(s.theta)
  		this.y = Math.cos(s.phi) * s.radius
  		this.z = sinPhiRadius * Math.cos(s.theta)

  		return this
  	},

  	setFromCylindrical: function (c) {
  		this.x = c.radius * Math.sin(c.theta)
  		this.y = c.y
  		this.z = c.radius * Math.cos(c.theta)

  		return this
  	},

  	setFromMatrixPosition: function (m) {
  		var e = m.elements

  		this.x = e[12]
  		this.y = e[13]
  		this.z = e[14]

  		return this
  	},

  	setFromMatrixScale: function (m) {
  		var sx = this.setFromMatrixColumn(m, 0).length()
  		var sy = this.setFromMatrixColumn(m, 1).length()
  		var sz = this.setFromMatrixColumn(m, 2).length()

  		this.x = sx
  		this.y = sy
  		this.z = sz

  		return this
  	},

  	setFromMatrixColumn: function (m, index) {
  		return this.fromArray(m.elements, index * 4)
  	},

  	equals: function (v) {
  		return ((v.x === this.x) && (v.y === this.y) && (v.z === this.z))
  	},

  	fromArray: function (array, offset) {
  		if (offset === undefined) offset = 0

  		this.x = array[offset]
  		this.y = array[offset + 1]
  		this.z = array[offset + 2]

  		return this
  	},

  	toArray: function (array, offset) {
  		if (array === undefined) array = []
  		if (offset === undefined) offset = 0

  		array[offset] = this.x
  		array[offset + 1] = this.y
  		array[offset + 2] = this.z

  		return array
  	},

  	fromBufferAttribute: function (attribute, index, offset) {
  		if (offset !== undefined) {
  			console.warn('THREE.Vector3: offset has been removed from .fromBufferAttribute().')
  		}

  		this.x = attribute.getX(index)
  		this.y = attribute.getY(index)
  		this.z = attribute.getZ(index)

  		return this
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author WestLangley / http://github.com/WestLangley
   * @author bhouston / http://clara.io
   * @author tschw
   */

  function Matrix3 () {
  	this.elements = [

  		1, 0, 0,
  		0, 1, 0,
  		0, 0, 1

  	]

  	if (arguments.length > 0) {
  		console.error('THREE.Matrix3: the constructor no longer reads arguments. use .set() instead.')
  	}
  }

  Object.assign(Matrix3.prototype, {

  	isMatrix3: true,

  	set: function (n11, n12, n13, n21, n22, n23, n31, n32, n33) {
  		var te = this.elements

  		te[0] = n11; te[1] = n21; te[2] = n31
  		te[3] = n12; te[4] = n22; te[5] = n32
  		te[6] = n13; te[7] = n23; te[8] = n33

  		return this
  	},

  	identity: function () {
  		this.set(

  			1, 0, 0,
  			0, 1, 0,
  			0, 0, 1

  		)

  		return this
  	},

  	clone: function () {
  		return new this.constructor().fromArray(this.elements)
  	},

  	copy: function (m) {
  		var te = this.elements
  		var me = m.elements

  		te[0] = me[0]; te[1] = me[1]; te[2] = me[2]
  		te[3] = me[3]; te[4] = me[4]; te[5] = me[5]
  		te[6] = me[6]; te[7] = me[7]; te[8] = me[8]

  		return this
  	},

  	setFromMatrix4: function (m) {
  		var me = m.elements

  		this.set(

  			me[0], me[4], me[8],
  			me[1], me[5], me[9],
  			me[2], me[6], me[10]

  		)

  		return this
  	},

  	applyToBufferAttribute: (function () {
  		var v1 = new Vector3()

  		return function applyToBufferAttribute (attribute) {
  			for (var i = 0, l = attribute.count; i < l; i++) {
  				v1.x = attribute.getX(i)
  				v1.y = attribute.getY(i)
  				v1.z = attribute.getZ(i)

  				v1.applyMatrix3(this)

  				attribute.setXYZ(i, v1.x, v1.y, v1.z)
  			}

  			return attribute
  		}
  	}()),

  	multiply: function (m) {
  		return this.multiplyMatrices(this, m)
  	},

  	premultiply: function (m) {
  		return this.multiplyMatrices(m, this)
  	},

  	multiplyMatrices: function (a, b) {
  		var ae = a.elements
  		var be = b.elements
  		var te = this.elements

  		var a11 = ae[0]; var a12 = ae[3]; var a13 = ae[6]
  		var a21 = ae[1]; var a22 = ae[4]; var a23 = ae[7]
  		var a31 = ae[2]; var a32 = ae[5]; var a33 = ae[8]

  		var b11 = be[0]; var b12 = be[3]; var b13 = be[6]
  		var b21 = be[1]; var b22 = be[4]; var b23 = be[7]
  		var b31 = be[2]; var b32 = be[5]; var b33 = be[8]

  		te[0] = a11 * b11 + a12 * b21 + a13 * b31
  		te[3] = a11 * b12 + a12 * b22 + a13 * b32
  		te[6] = a11 * b13 + a12 * b23 + a13 * b33

  		te[1] = a21 * b11 + a22 * b21 + a23 * b31
  		te[4] = a21 * b12 + a22 * b22 + a23 * b32
  		te[7] = a21 * b13 + a22 * b23 + a23 * b33

  		te[2] = a31 * b11 + a32 * b21 + a33 * b31
  		te[5] = a31 * b12 + a32 * b22 + a33 * b32
  		te[8] = a31 * b13 + a32 * b23 + a33 * b33

  		return this
  	},

  	multiplyScalar: function (s) {
  		var te = this.elements

  		te[0] *= s; te[3] *= s; te[6] *= s
  		te[1] *= s; te[4] *= s; te[7] *= s
  		te[2] *= s; te[5] *= s; te[8] *= s

  		return this
  	},

  	determinant: function () {
  		var te = this.elements

  		var a = te[0]; var b = te[1]; var c = te[2]
  			var d = te[3]; var e = te[4]; var f = te[5]
  			var g = te[6]; var h = te[7]; var i = te[8]

  		return a * e * i - a * f * h - b * d * i + b * f * g + c * d * h - c * e * g
  	},

  	getInverse: function (matrix, throwOnDegenerate) {
  		if (matrix && matrix.isMatrix4) {
  			console.error('THREE.Matrix3: .getInverse() no longer takes a Matrix4 argument.')
  		}

  		var me = matrix.elements
  			var te = this.elements

  			var n11 = me[0]; var n21 = me[1]; var n31 = me[2]
  			var n12 = me[3]; var n22 = me[4]; var n32 = me[5]
  			var n13 = me[6]; var n23 = me[7]; var n33 = me[8]

  			var t11 = n33 * n22 - n32 * n23
  			var t12 = n32 * n13 - n33 * n12
  			var t13 = n23 * n12 - n22 * n13

  			var det = n11 * t11 + n21 * t12 + n31 * t13

  		if (det === 0) {
  			var msg = "THREE.Matrix3: .getInverse() can't invert matrix, determinant is 0"

  			if (throwOnDegenerate === true) {
  				throw new Error(msg)
  			} else {
  				console.warn(msg)
  			}

  			return this.identity()
  		}

  		var detInv = 1 / det

  		te[0] = t11 * detInv
  		te[1] = (n31 * n23 - n33 * n21) * detInv
  		te[2] = (n32 * n21 - n31 * n22) * detInv

  		te[3] = t12 * detInv
  		te[4] = (n33 * n11 - n31 * n13) * detInv
  		te[5] = (n31 * n12 - n32 * n11) * detInv

  		te[6] = t13 * detInv
  		te[7] = (n21 * n13 - n23 * n11) * detInv
  		te[8] = (n22 * n11 - n21 * n12) * detInv

  		return this
  	},

  	transpose: function () {
  		var tmp; var m = this.elements

  		tmp = m[1]; m[1] = m[3]; m[3] = tmp
  		tmp = m[2]; m[2] = m[6]; m[6] = tmp
  		tmp = m[5]; m[5] = m[7]; m[7] = tmp

  		return this
  	},

  	getNormalMatrix: function (matrix4) {
  		return this.setFromMatrix4(matrix4).getInverse(this).transpose()
  	},

  	transposeIntoArray: function (r) {
  		var m = this.elements

  		r[0] = m[0]
  		r[1] = m[3]
  		r[2] = m[6]
  		r[3] = m[1]
  		r[4] = m[4]
  		r[5] = m[7]
  		r[6] = m[2]
  		r[7] = m[5]
  		r[8] = m[8]

  		return this
  	},

  	setUvTransform: function (tx, ty, sx, sy, rotation, cx, cy) {
  		var c = Math.cos(rotation)
  		var s = Math.sin(rotation)

  		this.set(
  			sx * c, sx * s, -sx * (c * cx + s * cy) + cx + tx,
  			-sy * s, sy * c, -sy * (-s * cx + c * cy) + cy + ty,
  			0, 0, 1
  		)
  	},

  	scale: function (sx, sy) {
  		var te = this.elements

  		te[0] *= sx; te[3] *= sx; te[6] *= sx
  		te[1] *= sy; te[4] *= sy; te[7] *= sy

  		return this
  	},

  	rotate: function (theta) {
  		var c = Math.cos(theta)
  		var s = Math.sin(theta)

  		var te = this.elements

  		var a11 = te[0]; var a12 = te[3]; var a13 = te[6]
  		var a21 = te[1]; var a22 = te[4]; var a23 = te[7]

  		te[0] = c * a11 + s * a21
  		te[3] = c * a12 + s * a22
  		te[6] = c * a13 + s * a23

  		te[1] = -s * a11 + c * a21
  		te[4] = -s * a12 + c * a22
  		te[7] = -s * a13 + c * a23

  		return this
  	},

  	translate: function (tx, ty) {
  		var te = this.elements

  		te[0] += tx * te[2]; te[3] += tx * te[5]; te[6] += tx * te[8]
  		te[1] += ty * te[2]; te[4] += ty * te[5]; te[7] += ty * te[8]

  		return this
  	},

  	equals: function (matrix) {
  		var te = this.elements
  		var me = matrix.elements

  		for (var i = 0; i < 9; i++) {
  			if (te[i] !== me[i]) return false
  		}

  		return true
  	},

  	fromArray: function (array, offset) {
  		if (offset === undefined) offset = 0

  		for (var i = 0; i < 9; i++) {
  			this.elements[i] = array[i + offset]
  		}

  		return this
  	},

  	toArray: function (array, offset) {
  		if (array === undefined) array = []
  		if (offset === undefined) offset = 0

  		var te = this.elements

  		array[offset] = te[0]
  		array[offset + 1] = te[1]
  		array[offset + 2] = te[2]

  		array[offset + 3] = te[3]
  		array[offset + 4] = te[4]
  		array[offset + 5] = te[5]

  		array[offset + 6] = te[6]
  		array[offset + 7] = te[7]
  		array[offset + 8] = te[8]

  		return array
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   * @author szimek / https://github.com/szimek/
   */

  var textureId = 0

  function Texture (image, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding) {
  	Object.defineProperty(this, 'id', { value: textureId++ })

  	this.uuid = _Math.generateUUID()

  	this.name = ''

  	this.image = image !== undefined ? image : Texture.DEFAULT_IMAGE
  	this.mipmaps = []

  	this.mapping = mapping !== undefined ? mapping : Texture.DEFAULT_MAPPING

  	this.wrapS = wrapS !== undefined ? wrapS : ClampToEdgeWrapping
  	this.wrapT = wrapT !== undefined ? wrapT : ClampToEdgeWrapping

  	this.magFilter = magFilter !== undefined ? magFilter : LinearFilter
  	this.minFilter = minFilter !== undefined ? minFilter : LinearMipMapLinearFilter

  	this.anisotropy = anisotropy !== undefined ? anisotropy : 1

  	this.format = format !== undefined ? format : RGBAFormat
  	this.type = type !== undefined ? type : UnsignedByteType

  	this.offset = new Vector2(0, 0)
  	this.repeat = new Vector2(1, 1)
  	this.center = new Vector2(0, 0)
  	this.rotation = 0

  	this.matrixAutoUpdate = true
  	this.matrix = new Matrix3()

  	this.generateMipmaps = true
  	this.premultiplyAlpha = false
  	this.flipY = true
  	this.unpackAlignment = 4	// valid values: 1, 2, 4, 8 (see http://www.khronos.org/opengles/sdk/docs/man/xhtml/glPixelStorei.xml)

  	// Values of encoding !== THREE.LinearEncoding only supported on map, envMap and emissiveMap.
  	//
  	// Also changing the encoding after already used by a Material will not automatically make the Material
  	// update.  You need to explicitly call Material.needsUpdate to trigger it to recompile.
  	this.encoding = encoding !== undefined ? encoding : LinearEncoding

  	this.version = 0
  	this.onUpdate = null
  }

  Texture.DEFAULT_IMAGE = undefined
  Texture.DEFAULT_MAPPING = UVMapping

  Texture.prototype = Object.assign(Object.create(EventDispatcher.prototype), {

  	constructor: Texture,

  	isTexture: true,

  	updateMatrix: function () {
  		this.matrix.setUvTransform(this.offset.x, this.offset.y, this.repeat.x, this.repeat.y, this.rotation, this.center.x, this.center.y)
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (source) {
  		this.name = source.name

  		this.image = source.image
  		this.mipmaps = source.mipmaps.slice(0)

  		this.mapping = source.mapping

  		this.wrapS = source.wrapS
  		this.wrapT = source.wrapT

  		this.magFilter = source.magFilter
  		this.minFilter = source.minFilter

  		this.anisotropy = source.anisotropy

  		this.format = source.format
  		this.type = source.type

  		this.offset.copy(source.offset)
  		this.repeat.copy(source.repeat)
  		this.center.copy(source.center)
  		this.rotation = source.rotation

  		this.matrixAutoUpdate = source.matrixAutoUpdate
  		this.matrix.copy(source.matrix)

  		this.generateMipmaps = source.generateMipmaps
  		this.premultiplyAlpha = source.premultiplyAlpha
  		this.flipY = source.flipY
  		this.unpackAlignment = source.unpackAlignment
  		this.encoding = source.encoding

  		return this
  	},

  	toJSON: function (meta) {
  		var isRootObject = (meta === undefined || typeof meta === 'string')

  		if (!isRootObject && meta.textures[this.uuid] !== undefined) {
  			return meta.textures[this.uuid]
  		}

  		function getDataURL (image) {
  			var canvas

  			if (image instanceof HTMLCanvasElement) {
  				canvas = image
  			} else {
  				canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas')
  				canvas.width = image.width
  				canvas.height = image.height

  				var context = canvas.getContext('2d')

  				if (image instanceof ImageData) {
  					context.putImageData(image, 0, 0)
  				} else {
  					context.drawImage(image, 0, 0, image.width, image.height)
  				}
  			}

  			if (canvas.width > 2048 || canvas.height > 2048) {
  				return canvas.toDataURL('image/jpeg', 0.6)
  			} else {
  				return canvas.toDataURL('image/png')
  			}
  		}

  		var output = {

  			metadata: {
  				version: 4.5,
  				type: 'Texture',
  				generator: 'Texture.toJSON'
  			},

  			uuid: this.uuid,
  			name: this.name,

  			mapping: this.mapping,

  			repeat: [this.repeat.x, this.repeat.y],
  			offset: [this.offset.x, this.offset.y],
  			center: [this.center.x, this.center.y],
  			rotation: this.rotation,

  			wrap: [this.wrapS, this.wrapT],

  			format: this.format,
  			minFilter: this.minFilter,
  			magFilter: this.magFilter,
  			anisotropy: this.anisotropy,

  			flipY: this.flipY

  		}

  		if (this.image !== undefined) {
  			// TODO: Move to THREE.Image

  			var image = this.image

  			if (image.uuid === undefined) {
  				image.uuid = _Math.generateUUID() // UGH
  			}

  			if (!isRootObject && meta.images[image.uuid] === undefined) {
  				meta.images[image.uuid] = {
  					uuid: image.uuid,
  					url: getDataURL(image)
  				}
  			}

  			output.image = image.uuid
  		}

  		if (!isRootObject) {
  			meta.textures[this.uuid] = output
  		}

  		return output
  	},

  	dispose: function () {
  		this.dispatchEvent({ type: 'dispose' })
  	},

  	transformUv: function (uv) {
  		if (this.mapping !== UVMapping) return

  		uv.applyMatrix3(this.matrix)

  		if (uv.x < 0 || uv.x > 1) {
  			switch (this.wrapS) {
  				case RepeatWrapping:

  					uv.x = uv.x - Math.floor(uv.x)
  					break

  				case ClampToEdgeWrapping:

  					uv.x = uv.x < 0 ? 0 : 1
  					break

  				case MirroredRepeatWrapping:

  					if (Math.abs(Math.floor(uv.x) % 2) === 1) {
  						uv.x = Math.ceil(uv.x) - uv.x
  					} else {
  						uv.x = uv.x - Math.floor(uv.x)
  					}
  					break
  			}
  		}

  		if (uv.y < 0 || uv.y > 1) {
  			switch (this.wrapT) {
  				case RepeatWrapping:

  					uv.y = uv.y - Math.floor(uv.y)
  					break

  				case ClampToEdgeWrapping:

  					uv.y = uv.y < 0 ? 0 : 1
  					break

  				case MirroredRepeatWrapping:

  					if (Math.abs(Math.floor(uv.y) % 2) === 1) {
  						uv.y = Math.ceil(uv.y) - uv.y
  					} else {
  						uv.y = uv.y - Math.floor(uv.y)
  					}
  					break
  			}
  		}

  		if (this.flipY) {
  			uv.y = 1 - uv.y
  		}
  	}

  })

  Object.defineProperty(Texture.prototype, 'needsUpdate', {

  	set: function (value) {
  		if (value === true) this.version++
  	}

  })

  /**
   * @author supereggbert / http://www.paulbrunt.co.uk/
   * @author philogb / http://blog.thejit.org/
   * @author mikael emtinger / http://gomo.se/
   * @author egraether / http://egraether.com/
   * @author WestLangley / http://github.com/WestLangley
   */

  function Vector4 (x, y, z, w) {
  	this.x = x || 0
  	this.y = y || 0
  	this.z = z || 0
  	this.w = (w !== undefined) ? w : 1
  }

  Object.assign(Vector4.prototype, {

  	isVector4: true,

  	set: function (x, y, z, w) {
  		this.x = x
  		this.y = y
  		this.z = z
  		this.w = w

  		return this
  	},

  	setScalar: function (scalar) {
  		this.x = scalar
  		this.y = scalar
  		this.z = scalar
  		this.w = scalar

  		return this
  	},

  	setX: function (x) {
  		this.x = x

  		return this
  	},

  	setY: function (y) {
  		this.y = y

  		return this
  	},

  	setZ: function (z) {
  		this.z = z

  		return this
  	},

  	setW: function (w) {
  		this.w = w

  		return this
  	},

  	setComponent: function (index, value) {
  		switch (index) {
  			case 0: this.x = value; break
  			case 1: this.y = value; break
  			case 2: this.z = value; break
  			case 3: this.w = value; break
  			default: throw new Error('index is out of range: ' + index)
  		}

  		return this
  	},

  	getComponent: function (index) {
  		switch (index) {
  			case 0: return this.x
  			case 1: return this.y
  			case 2: return this.z
  			case 3: return this.w
  			default: throw new Error('index is out of range: ' + index)
  		}
  	},

  	clone: function () {
  		return new this.constructor(this.x, this.y, this.z, this.w)
  	},

  	copy: function (v) {
  		this.x = v.x
  		this.y = v.y
  		this.z = v.z
  		this.w = (v.w !== undefined) ? v.w : 1

  		return this
  	},

  	add: function (v, w) {
  		if (w !== undefined) {
  			console.warn('THREE.Vector4: .add() now only accepts one argument. Use .addVectors( a, b ) instead.')
  			return this.addVectors(v, w)
  		}

  		this.x += v.x
  		this.y += v.y
  		this.z += v.z
  		this.w += v.w

  		return this
  	},

  	addScalar: function (s) {
  		this.x += s
  		this.y += s
  		this.z += s
  		this.w += s

  		return this
  	},

  	addVectors: function (a, b) {
  		this.x = a.x + b.x
  		this.y = a.y + b.y
  		this.z = a.z + b.z
  		this.w = a.w + b.w

  		return this
  	},

  	addScaledVector: function (v, s) {
  		this.x += v.x * s
  		this.y += v.y * s
  		this.z += v.z * s
  		this.w += v.w * s

  		return this
  	},

  	sub: function (v, w) {
  		if (w !== undefined) {
  			console.warn('THREE.Vector4: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.')
  			return this.subVectors(v, w)
  		}

  		this.x -= v.x
  		this.y -= v.y
  		this.z -= v.z
  		this.w -= v.w

  		return this
  	},

  	subScalar: function (s) {
  		this.x -= s
  		this.y -= s
  		this.z -= s
  		this.w -= s

  		return this
  	},

  	subVectors: function (a, b) {
  		this.x = a.x - b.x
  		this.y = a.y - b.y
  		this.z = a.z - b.z
  		this.w = a.w - b.w

  		return this
  	},

  	multiplyScalar: function (scalar) {
  		this.x *= scalar
  		this.y *= scalar
  		this.z *= scalar
  		this.w *= scalar

  		return this
  	},

  	applyMatrix4: function (m) {
  		var x = this.x; var y = this.y; var z = this.z; var w = this.w
  		var e = m.elements

  		this.x = e[0] * x + e[4] * y + e[8] * z + e[12] * w
  		this.y = e[1] * x + e[5] * y + e[9] * z + e[13] * w
  		this.z = e[2] * x + e[6] * y + e[10] * z + e[14] * w
  		this.w = e[3] * x + e[7] * y + e[11] * z + e[15] * w

  		return this
  	},

  	divideScalar: function (scalar) {
  		return this.multiplyScalar(1 / scalar)
  	},

  	setAxisAngleFromQuaternion: function (q) {
  		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/quaternionToAngle/index.htm

  		// q is assumed to be normalized

  		this.w = 2 * Math.acos(q.w)

  		var s = Math.sqrt(1 - q.w * q.w)

  		if (s < 0.0001) {
  			this.x = 1
  			this.y = 0
  			this.z = 0
  		} else {
  			this.x = q.x / s
  			this.y = q.y / s
  			this.z = q.z / s
  		}

  		return this
  	},

  	setAxisAngleFromRotationMatrix: function (m) {
  		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToAngle/index.htm

  		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

  		var angle; var x; var y; var z		// variables for result
  			var epsilon = 0.01		// margin to allow for rounding errors
  			var epsilon2 = 0.1		// margin to distinguish between 0 and 180 degrees

  			var te = m.elements

  			var m11 = te[0]; var m12 = te[4]; var m13 = te[8]
  			var m21 = te[1]; var m22 = te[5]; var m23 = te[9]
  			var m31 = te[2]; var m32 = te[6]; var m33 = te[10]

  		if ((Math.abs(m12 - m21) < epsilon) &&
  		     (Math.abs(m13 - m31) < epsilon) &&
  		     (Math.abs(m23 - m32) < epsilon)) {
  			// singularity found
  			// first check for identity matrix which must have +1 for all terms
  			// in leading diagonal and zero in other terms

  			if ((Math.abs(m12 + m21) < epsilon2) &&
  			     (Math.abs(m13 + m31) < epsilon2) &&
  			     (Math.abs(m23 + m32) < epsilon2) &&
  			     (Math.abs(m11 + m22 + m33 - 3) < epsilon2)) {
  				// this singularity is identity matrix so angle = 0

  				this.set(1, 0, 0, 0)

  				return this // zero angle, arbitrary axis
  			}

  			// otherwise this singularity is angle = 180

  			angle = Math.PI

  			var xx = (m11 + 1) / 2
  			var yy = (m22 + 1) / 2
  			var zz = (m33 + 1) / 2
  			var xy = (m12 + m21) / 4
  			var xz = (m13 + m31) / 4
  			var yz = (m23 + m32) / 4

  			if ((xx > yy) && (xx > zz)) {
  				// m11 is the largest diagonal term

  				if (xx < epsilon) {
  					x = 0
  					y = 0.707106781
  					z = 0.707106781
  				} else {
  					x = Math.sqrt(xx)
  					y = xy / x
  					z = xz / x
  				}
  			} else if (yy > zz) {
  				// m22 is the largest diagonal term

  				if (yy < epsilon) {
  					x = 0.707106781
  					y = 0
  					z = 0.707106781
  				} else {
  					y = Math.sqrt(yy)
  					x = xy / y
  					z = yz / y
  				}
  			} else {
  				// m33 is the largest diagonal term so base result on this

  				if (zz < epsilon) {
  					x = 0.707106781
  					y = 0.707106781
  					z = 0
  				} else {
  					z = Math.sqrt(zz)
  					x = xz / z
  					y = yz / z
  				}
  			}

  			this.set(x, y, z, angle)

  			return this // return 180 deg rotation
  		}

  		// as we have reached here there are no singularities so we can handle normally

  		var s = Math.sqrt((m32 - m23) * (m32 - m23) +
  		                   (m13 - m31) * (m13 - m31) +
  		                   (m21 - m12) * (m21 - m12)) // used to normalize

  		if (Math.abs(s) < 0.001) s = 1

  		// prevent divide by zero, should not happen if matrix is orthogonal and should be
  		// caught by singularity test above, but I've left it in just in case

  		this.x = (m32 - m23) / s
  		this.y = (m13 - m31) / s
  		this.z = (m21 - m12) / s
  		this.w = Math.acos((m11 + m22 + m33 - 1) / 2)

  		return this
  	},

  	min: function (v) {
  		this.x = Math.min(this.x, v.x)
  		this.y = Math.min(this.y, v.y)
  		this.z = Math.min(this.z, v.z)
  		this.w = Math.min(this.w, v.w)

  		return this
  	},

  	max: function (v) {
  		this.x = Math.max(this.x, v.x)
  		this.y = Math.max(this.y, v.y)
  		this.z = Math.max(this.z, v.z)
  		this.w = Math.max(this.w, v.w)

  		return this
  	},

  	clamp: function (min, max) {
  		// assumes min < max, componentwise

  		this.x = Math.max(min.x, Math.min(max.x, this.x))
  		this.y = Math.max(min.y, Math.min(max.y, this.y))
  		this.z = Math.max(min.z, Math.min(max.z, this.z))
  		this.w = Math.max(min.w, Math.min(max.w, this.w))

  		return this
  	},

  	clampScalar: (function () {
  		var min, max

  		return function clampScalar (minVal, maxVal) {
  			if (min === undefined) {
  				min = new Vector4()
  				max = new Vector4()
  			}

  			min.set(minVal, minVal, minVal, minVal)
  			max.set(maxVal, maxVal, maxVal, maxVal)

  			return this.clamp(min, max)
  		}
  	}()),

  	clampLength: function (min, max) {
  		var length = this.length()

  		return this.divideScalar(length || 1).multiplyScalar(Math.max(min, Math.min(max, length)))
  	},

  	floor: function () {
  		this.x = Math.floor(this.x)
  		this.y = Math.floor(this.y)
  		this.z = Math.floor(this.z)
  		this.w = Math.floor(this.w)

  		return this
  	},

  	ceil: function () {
  		this.x = Math.ceil(this.x)
  		this.y = Math.ceil(this.y)
  		this.z = Math.ceil(this.z)
  		this.w = Math.ceil(this.w)

  		return this
  	},

  	round: function () {
  		this.x = Math.round(this.x)
  		this.y = Math.round(this.y)
  		this.z = Math.round(this.z)
  		this.w = Math.round(this.w)

  		return this
  	},

  	roundToZero: function () {
  		this.x = (this.x < 0) ? Math.ceil(this.x) : Math.floor(this.x)
  		this.y = (this.y < 0) ? Math.ceil(this.y) : Math.floor(this.y)
  		this.z = (this.z < 0) ? Math.ceil(this.z) : Math.floor(this.z)
  		this.w = (this.w < 0) ? Math.ceil(this.w) : Math.floor(this.w)

  		return this
  	},

  	negate: function () {
  		this.x = -this.x
  		this.y = -this.y
  		this.z = -this.z
  		this.w = -this.w

  		return this
  	},

  	dot: function (v) {
  		return this.x * v.x + this.y * v.y + this.z * v.z + this.w * v.w
  	},

  	lengthSq: function () {
  		return this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w
  	},

  	length: function () {
  		return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w)
  	},

  	manhattanLength: function () {
  		return Math.abs(this.x) + Math.abs(this.y) + Math.abs(this.z) + Math.abs(this.w)
  	},

  	normalize: function () {
  		return this.divideScalar(this.length() || 1)
  	},

  	setLength: function (length) {
  		return this.normalize().multiplyScalar(length)
  	},

  	lerp: function (v, alpha) {
  		this.x += (v.x - this.x) * alpha
  		this.y += (v.y - this.y) * alpha
  		this.z += (v.z - this.z) * alpha
  		this.w += (v.w - this.w) * alpha

  		return this
  	},

  	lerpVectors: function (v1, v2, alpha) {
  		return this.subVectors(v2, v1).multiplyScalar(alpha).add(v1)
  	},

  	equals: function (v) {
  		return ((v.x === this.x) && (v.y === this.y) && (v.z === this.z) && (v.w === this.w))
  	},

  	fromArray: function (array, offset) {
  		if (offset === undefined) offset = 0

  		this.x = array[offset]
  		this.y = array[offset + 1]
  		this.z = array[offset + 2]
  		this.w = array[offset + 3]

  		return this
  	},

  	toArray: function (array, offset) {
  		if (array === undefined) array = []
  		if (offset === undefined) offset = 0

  		array[offset] = this.x
  		array[offset + 1] = this.y
  		array[offset + 2] = this.z
  		array[offset + 3] = this.w

  		return array
  	},

  	fromBufferAttribute: function (attribute, index, offset) {
  		if (offset !== undefined) {
  			console.warn('THREE.Vector4: offset has been removed from .fromBufferAttribute().')
  		}

  		this.x = attribute.getX(index)
  		this.y = attribute.getY(index)
  		this.z = attribute.getZ(index)
  		this.w = attribute.getW(index)

  		return this
  	}

  })

  /**
   * @author szimek / https://github.com/szimek/
   * @author alteredq / http://alteredqualia.com/
   * @author Marius Kintel / https://github.com/kintel
   */

  /*
   In options, we can specify:
   * Texture parameters for an auto-generated target texture
   * depthBuffer/stencilBuffer: Booleans to indicate if we should generate these buffers
  */
  function WebGLRenderTarget (width, height, options) {
  	this.width = width
  	this.height = height

  	this.scissor = new Vector4(0, 0, width, height)
  	this.scissorTest = false

  	this.viewport = new Vector4(0, 0, width, height)

  	options = options || {}

  	if (options.minFilter === undefined) options.minFilter = LinearFilter

  	this.texture = new Texture(undefined, undefined, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.encoding)

  	this.texture.generateMipmaps = options.generateMipmaps !== undefined ? options.generateMipmaps : true

  	this.depthBuffer = options.depthBuffer !== undefined ? options.depthBuffer : true
  	this.stencilBuffer = options.stencilBuffer !== undefined ? options.stencilBuffer : true
  	this.depthTexture = options.depthTexture !== undefined ? options.depthTexture : null
  }

  WebGLRenderTarget.prototype = Object.assign(Object.create(EventDispatcher.prototype), {

  	constructor: WebGLRenderTarget,

  	isWebGLRenderTarget: true,

  	setSize: function (width, height) {
  		if (this.width !== width || this.height !== height) {
  			this.width = width
  			this.height = height

  			this.dispose()
  		}

  		this.viewport.set(0, 0, width, height)
  		this.scissor.set(0, 0, width, height)
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (source) {
  		this.width = source.width
  		this.height = source.height

  		this.viewport.copy(source.viewport)

  		this.texture = source.texture.clone()

  		this.depthBuffer = source.depthBuffer
  		this.stencilBuffer = source.stencilBuffer
  		this.depthTexture = source.depthTexture

  		return this
  	},

  	dispose: function () {
  		this.dispatchEvent({ type: 'dispose' })
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com
   */

  function WebGLRenderTargetCube (width, height, options) {
  	WebGLRenderTarget.call(this, width, height, options)

  	this.activeCubeFace = 0 // PX 0, NX 1, PY 2, NY 3, PZ 4, NZ 5
  	this.activeMipMapLevel = 0
  }

  WebGLRenderTargetCube.prototype = Object.create(WebGLRenderTarget.prototype)
  WebGLRenderTargetCube.prototype.constructor = WebGLRenderTargetCube

  WebGLRenderTargetCube.prototype.isWebGLRenderTargetCube = true

  /**
   * @author alteredq / http://alteredqualia.com/
   */

  function DataTexture (data, width, height, format, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, encoding) {
  	Texture.call(this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding)

  	this.image = { data: data, width: width, height: height }

  	this.magFilter = magFilter !== undefined ? magFilter : NearestFilter
  	this.minFilter = minFilter !== undefined ? minFilter : NearestFilter

  	this.generateMipmaps = false
  	this.flipY = false
  	this.unpackAlignment = 1
  }

  DataTexture.prototype = Object.create(Texture.prototype)
  DataTexture.prototype.constructor = DataTexture

  DataTexture.prototype.isDataTexture = true

  /**
   * @author bhouston / http://clara.io
   * @author WestLangley / http://github.com/WestLangley
   */

  function Box3 (min, max) {
  	this.min = (min !== undefined) ? min : new Vector3(+Infinity, +Infinity, +Infinity)
  	this.max = (max !== undefined) ? max : new Vector3(-Infinity, -Infinity, -Infinity)
  }

  Object.assign(Box3.prototype, {

  	isBox3: true,

  	set: function (min, max) {
  		this.min.copy(min)
  		this.max.copy(max)

  		return this
  	},

  	setFromArray: function (array) {
  		var minX = +Infinity
  		var minY = +Infinity
  		var minZ = +Infinity

  		var maxX = -Infinity
  		var maxY = -Infinity
  		var maxZ = -Infinity

  		for (var i = 0, l = array.length; i < l; i += 3) {
  			var x = array[i]
  			var y = array[i + 1]
  			var z = array[i + 2]

  			if (x < minX) minX = x
  			if (y < minY) minY = y
  			if (z < minZ) minZ = z

  			if (x > maxX) maxX = x
  			if (y > maxY) maxY = y
  			if (z > maxZ) maxZ = z
  		}

  		this.min.set(minX, minY, minZ)
  		this.max.set(maxX, maxY, maxZ)

  		return this
  	},

  	setFromBufferAttribute: function (attribute) {
  		var minX = +Infinity
  		var minY = +Infinity
  		var minZ = +Infinity

  		var maxX = -Infinity
  		var maxY = -Infinity
  		var maxZ = -Infinity

  		for (var i = 0, l = attribute.count; i < l; i++) {
  			var x = attribute.getX(i)
  			var y = attribute.getY(i)
  			var z = attribute.getZ(i)

  			if (x < minX) minX = x
  			if (y < minY) minY = y
  			if (z < minZ) minZ = z

  			if (x > maxX) maxX = x
  			if (y > maxY) maxY = y
  			if (z > maxZ) maxZ = z
  		}

  		this.min.set(minX, minY, minZ)
  		this.max.set(maxX, maxY, maxZ)

  		return this
  	},

  	setFromPoints: function (points) {
  		this.makeEmpty()

  		for (var i = 0, il = points.length; i < il; i++) {
  			this.expandByPoint(points[i])
  		}

  		return this
  	},

  	setFromCenterAndSize: (function () {
  		var v1 = new Vector3()

  		return function setFromCenterAndSize (center, size) {
  			var halfSize = v1.copy(size).multiplyScalar(0.5)

  			this.min.copy(center).sub(halfSize)
  			this.max.copy(center).add(halfSize)

  			return this
  		}
  	}()),

  	setFromObject: function (object) {
  		this.makeEmpty()

  		return this.expandByObject(object)
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (box) {
  		this.min.copy(box.min)
  		this.max.copy(box.max)

  		return this
  	},

  	makeEmpty: function () {
  		this.min.x = this.min.y = this.min.z = +Infinity
  		this.max.x = this.max.y = this.max.z = -Infinity

  		return this
  	},

  	isEmpty: function () {
  		// this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes

  		return (this.max.x < this.min.x) || (this.max.y < this.min.y) || (this.max.z < this.min.z)
  	},

  	getCenter: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Box3: .getCenter() target is now required')
  			target = new Vector3()
  		}

  		return this.isEmpty() ? target.set(0, 0, 0) : target.addVectors(this.min, this.max).multiplyScalar(0.5)
  	},

  	getSize: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Box3: .getSize() target is now required')
  			target = new Vector3()
  		}

  		return this.isEmpty() ? target.set(0, 0, 0) : target.subVectors(this.max, this.min)
  	},

  	expandByPoint: function (point) {
  		this.min.min(point)
  		this.max.max(point)

  		return this
  	},

  	expandByVector: function (vector) {
  		this.min.sub(vector)
  		this.max.add(vector)

  		return this
  	},

  	expandByScalar: function (scalar) {
  		this.min.addScalar(-scalar)
  		this.max.addScalar(scalar)

  		return this
  	},

  	expandByObject: (function () {
  		// Computes the world-axis-aligned bounding box of an object (including its children),
  		// accounting for both the object's, and children's, world transforms

  		var scope, i, l

  		var v1 = new Vector3()

  		function traverse (node) {
  			var geometry = node.geometry

  			if (geometry !== undefined) {
  				if (geometry.isGeometry) {
  					var vertices = geometry.vertices

  					for (i = 0, l = vertices.length; i < l; i++) {
  						v1.copy(vertices[i])
  						v1.applyMatrix4(node.matrixWorld)

  						scope.expandByPoint(v1)
  					}
  				} else if (geometry.isBufferGeometry) {
  					var attribute = geometry.attributes.position

  					if (attribute !== undefined) {
  						for (i = 0, l = attribute.count; i < l; i++) {
  							v1.fromBufferAttribute(attribute, i).applyMatrix4(node.matrixWorld)

  							scope.expandByPoint(v1)
  						}
  					}
  				}
  			}
  		}

  		return function expandByObject (object) {
  			scope = this

  			object.updateMatrixWorld(true)

  			object.traverse(traverse)

  			return this
  		}
  	}()),

  	containsPoint: function (point) {
  		return !(point.x < this.min.x || point.x > this.max.x ||
  			point.y < this.min.y || point.y > this.max.y ||
  			point.z < this.min.z || point.z > this.max.z)
  	},

  	containsBox: function (box) {
  		return this.min.x <= box.min.x && box.max.x <= this.max.x &&
  			this.min.y <= box.min.y && box.max.y <= this.max.y &&
  			this.min.z <= box.min.z && box.max.z <= this.max.z
  	},

  	getParameter: function (point, target) {
  		// This can potentially have a divide by zero if the box
  		// has a size dimension of 0.

  		if (target === undefined) {
  			console.warn('THREE.Box3: .getParameter() target is now required')
  			target = new Vector3()
  		}

  		return target.set(
  			(point.x - this.min.x) / (this.max.x - this.min.x),
  			(point.y - this.min.y) / (this.max.y - this.min.y),
  			(point.z - this.min.z) / (this.max.z - this.min.z)
  		)
  	},

  	intersectsBox: function (box) {
  		// using 6 splitting planes to rule out intersections.
  		return !(box.max.x < this.min.x || box.min.x > this.max.x ||
  			box.max.y < this.min.y || box.min.y > this.max.y ||
  			box.max.z < this.min.z || box.min.z > this.max.z)
  	},

  	intersectsSphere: (function () {
  		var closestPoint = new Vector3()

  		return function intersectsSphere (sphere) {
  			// Find the point on the AABB closest to the sphere center.
  			this.clampPoint(sphere.center, closestPoint)

  			// If that point is inside the sphere, the AABB and sphere intersect.
  			return closestPoint.distanceToSquared(sphere.center) <= (sphere.radius * sphere.radius)
  		}
  	})(),

  	intersectsPlane: function (plane) {
  		// We compute the minimum and maximum dot product values. If those values
  		// are on the same side (back or front) of the plane, then there is no intersection.

  		var min, max

  		if (plane.normal.x > 0) {
  			min = plane.normal.x * this.min.x
  			max = plane.normal.x * this.max.x
  		} else {
  			min = plane.normal.x * this.max.x
  			max = plane.normal.x * this.min.x
  		}

  		if (plane.normal.y > 0) {
  			min += plane.normal.y * this.min.y
  			max += plane.normal.y * this.max.y
  		} else {
  			min += plane.normal.y * this.max.y
  			max += plane.normal.y * this.min.y
  		}

  		if (plane.normal.z > 0) {
  			min += plane.normal.z * this.min.z
  			max += plane.normal.z * this.max.z
  		} else {
  			min += plane.normal.z * this.max.z
  			max += plane.normal.z * this.min.z
  		}

  		return (min <= plane.constant && max >= plane.constant)
  	},

  	intersectsTriangle: (function () {
  		// triangle centered vertices
  		var v0 = new Vector3()
  		var v1 = new Vector3()
  		var v2 = new Vector3()

  		// triangle edge vectors
  		var f0 = new Vector3()
  		var f1 = new Vector3()
  		var f2 = new Vector3()

  		var testAxis = new Vector3()

  		var center = new Vector3()
  		var extents = new Vector3()

  		var triangleNormal = new Vector3()

  		function satForAxes (axes) {
  			var i, j

  			for (i = 0, j = axes.length - 3; i <= j; i += 3) {
  				testAxis.fromArray(axes, i)
  				// project the aabb onto the seperating axis
  				var r = extents.x * Math.abs(testAxis.x) + extents.y * Math.abs(testAxis.y) + extents.z * Math.abs(testAxis.z)
  				// project all 3 vertices of the triangle onto the seperating axis
  				var p0 = v0.dot(testAxis)
  				var p1 = v1.dot(testAxis)
  				var p2 = v2.dot(testAxis)
  				// actual test, basically see if either of the most extreme of the triangle points intersects r
  				if (Math.max(-Math.max(p0, p1, p2), Math.min(p0, p1, p2)) > r) {
  					// points of the projected triangle are outside the projected half-length of the aabb
  					// the axis is seperating and we can exit
  					return false
  				}
  			}

  			return true
  		}

  		return function intersectsTriangle (triangle) {
  			if (this.isEmpty()) {
  				return false
  			}

  			// compute box center and extents
  			this.getCenter(center)
  			extents.subVectors(this.max, center)

  			// translate triangle to aabb origin
  			v0.subVectors(triangle.a, center)
  			v1.subVectors(triangle.b, center)
  			v2.subVectors(triangle.c, center)

  			// compute edge vectors for triangle
  			f0.subVectors(v1, v0)
  			f1.subVectors(v2, v1)
  			f2.subVectors(v0, v2)

  			// test against axes that are given by cross product combinations of the edges of the triangle and the edges of the aabb
  			// make an axis testing of each of the 3 sides of the aabb against each of the 3 sides of the triangle = 9 axis of separation
  			// axis_ij = u_i x f_j (u0, u1, u2 = face normals of aabb = x,y,z axes vectors since aabb is axis aligned)
  			var axes = [
  				0, -f0.z, f0.y, 0, -f1.z, f1.y, 0, -f2.z, f2.y,
  				f0.z, 0, -f0.x, f1.z, 0, -f1.x, f2.z, 0, -f2.x,
  				-f0.y, f0.x, 0, -f1.y, f1.x, 0, -f2.y, f2.x, 0
  			]
  			if (!satForAxes(axes)) {
  				return false
  			}

  			// test 3 face normals from the aabb
  			axes = [1, 0, 0, 0, 1, 0, 0, 0, 1]
  			if (!satForAxes(axes)) {
  				return false
  			}

  			// finally testing the face normal of the triangle
  			// use already existing triangle edge vectors here
  			triangleNormal.crossVectors(f0, f1)
  			axes = [triangleNormal.x, triangleNormal.y, triangleNormal.z]
  			return satForAxes(axes)
  		}
  	})(),

  	clampPoint: function (point, target) {
  		if (target === undefined) {
  			console.warn('THREE.Box3: .clampPoint() target is now required')
  			target = new Vector3()
  		}

  		return target.copy(point).clamp(this.min, this.max)
  	},

  	distanceToPoint: (function () {
  		var v1 = new Vector3()

  		return function distanceToPoint (point) {
  			var clampedPoint = v1.copy(point).clamp(this.min, this.max)
  			return clampedPoint.sub(point).length()
  		}
  	}()),

  	getBoundingSphere: (function () {
  		var v1 = new Vector3()

  		return function getBoundingSphere (target) {
  			if (target === undefined) {
  				console.warn('THREE.Box3: .getBoundingSphere() target is now required')
  				target = new Sphere()
  			}

  			this.getCenter(target.center)

  			target.radius = this.getSize(v1).length() * 0.5

  			return target
  		}
  	}()),

  	intersect: function (box) {
  		this.min.max(box.min)
  		this.max.min(box.max)

  		// ensure that if there is no overlap, the result is fully empty, not slightly empty with non-inf/+inf values that will cause subsequence intersects to erroneously return valid values.
  		if (this.isEmpty()) this.makeEmpty()

  		return this
  	},

  	union: function (box) {
  		this.min.min(box.min)
  		this.max.max(box.max)

  		return this
  	},

  	applyMatrix4: function (matrix) {
  		// transform of empty box is an empty box.
  		if (this.isEmpty()) return this

  		var m = matrix.elements

  		var xax = m[0] * this.min.x; var xay = m[1] * this.min.x; var xaz = m[2] * this.min.x
  		var xbx = m[0] * this.max.x; var xby = m[1] * this.max.x; var xbz = m[2] * this.max.x
  		var yax = m[4] * this.min.y; var yay = m[5] * this.min.y; var yaz = m[6] * this.min.y
  		var ybx = m[4] * this.max.y; var yby = m[5] * this.max.y; var ybz = m[6] * this.max.y
  		var zax = m[8] * this.min.z; var zay = m[9] * this.min.z; var zaz = m[10] * this.min.z
  		var zbx = m[8] * this.max.z; var zby = m[9] * this.max.z; var zbz = m[10] * this.max.z

  		this.min.x = Math.min(xax, xbx) + Math.min(yax, ybx) + Math.min(zax, zbx) + m[12]
  		this.min.y = Math.min(xay, xby) + Math.min(yay, yby) + Math.min(zay, zby) + m[13]
  		this.min.z = Math.min(xaz, xbz) + Math.min(yaz, ybz) + Math.min(zaz, zbz) + m[14]
  		this.max.x = Math.max(xax, xbx) + Math.max(yax, ybx) + Math.max(zax, zbx) + m[12]
  		this.max.y = Math.max(xay, xby) + Math.max(yay, yby) + Math.max(zay, zby) + m[13]
  		this.max.z = Math.max(xaz, xbz) + Math.max(yaz, ybz) + Math.max(zaz, zbz) + m[14]

  		return this
  	},

  	translate: function (offset) {
  		this.min.add(offset)
  		this.max.add(offset)

  		return this
  	},

  	equals: function (box) {
  		return box.min.equals(this.min) && box.max.equals(this.max)
  	}

  })

  /**
   * @author bhouston / http://clara.io
   * @author mrdoob / http://mrdoob.com/
   */

  function Sphere (center, radius) {
  	this.center = (center !== undefined) ? center : new Vector3()
  	this.radius = (radius !== undefined) ? radius : 0
  }

  Object.assign(Sphere.prototype, {

  	set: function (center, radius) {
  		this.center.copy(center)
  		this.radius = radius

  		return this
  	},

  	setFromPoints: (function () {
  		var box = new Box3()

  		return function setFromPoints (points, optionalCenter) {
  			var center = this.center

  			if (optionalCenter !== undefined) {
  				center.copy(optionalCenter)
  			} else {
  				box.setFromPoints(points).getCenter(center)
  			}

  			var maxRadiusSq = 0

  			for (var i = 0, il = points.length; i < il; i++) {
  				maxRadiusSq = Math.max(maxRadiusSq, center.distanceToSquared(points[i]))
  			}

  			this.radius = Math.sqrt(maxRadiusSq)

  			return this
  		}
  	}()),

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (sphere) {
  		this.center.copy(sphere.center)
  		this.radius = sphere.radius

  		return this
  	},

  	empty: function () {
  		return (this.radius <= 0)
  	},

  	containsPoint: function (point) {
  		return (point.distanceToSquared(this.center) <= (this.radius * this.radius))
  	},

  	distanceToPoint: function (point) {
  		return (point.distanceTo(this.center) - this.radius)
  	},

  	intersectsSphere: function (sphere) {
  		var radiusSum = this.radius + sphere.radius

  		return sphere.center.distanceToSquared(this.center) <= (radiusSum * radiusSum)
  	},

  	intersectsBox: function (box) {
  		return box.intersectsSphere(this)
  	},

  	intersectsPlane: function (plane) {
  		return Math.abs(plane.distanceToPoint(this.center)) <= this.radius
  	},

  	clampPoint: function (point, target) {
  		var deltaLengthSq = this.center.distanceToSquared(point)

  		if (target === undefined) {
  			console.warn('THREE.Sphere: .clampPoint() target is now required')
  			target = new Vector3()
  		}

  		target.copy(point)

  		if (deltaLengthSq > (this.radius * this.radius)) {
  			target.sub(this.center).normalize()
  			target.multiplyScalar(this.radius).add(this.center)
  		}

  		return target
  	},

  	getBoundingBox: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Sphere: .getBoundingBox() target is now required')
  			target = new Box3()
  		}

  		target.set(this.center, this.center)
  		target.expandByScalar(this.radius)

  		return target
  	},

  	applyMatrix4: function (matrix) {
  		this.center.applyMatrix4(matrix)
  		this.radius = this.radius * matrix.getMaxScaleOnAxis()

  		return this
  	},

  	translate: function (offset) {
  		this.center.add(offset)

  		return this
  	},

  	equals: function (sphere) {
  		return sphere.center.equals(this.center) && (sphere.radius === this.radius)
  	}

  })

  /**
   * @author bhouston / http://clara.io
   */

  function Plane (normal, constant) {
  	// normal is assumed to be normalized

  	this.normal = (normal !== undefined) ? normal : new Vector3(1, 0, 0)
  	this.constant = (constant !== undefined) ? constant : 0
  }

  Object.assign(Plane.prototype, {

  	set: function (normal, constant) {
  		this.normal.copy(normal)
  		this.constant = constant

  		return this
  	},

  	setComponents: function (x, y, z, w) {
  		this.normal.set(x, y, z)
  		this.constant = w

  		return this
  	},

  	setFromNormalAndCoplanarPoint: function (normal, point) {
  		this.normal.copy(normal)
  		this.constant = -point.dot(this.normal)

  		return this
  	},

  	setFromCoplanarPoints: (function () {
  		var v1 = new Vector3()
  		var v2 = new Vector3()

  		return function setFromCoplanarPoints (a, b, c) {
  			var normal = v1.subVectors(c, b).cross(v2.subVectors(a, b)).normalize()

  			// Q: should an error be thrown if normal is zero (e.g. degenerate plane)?

  			this.setFromNormalAndCoplanarPoint(normal, a)

  			return this
  		}
  	}()),

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (plane) {
  		this.normal.copy(plane.normal)
  		this.constant = plane.constant

  		return this
  	},

  	normalize: function () {
  		// Note: will lead to a divide by zero if the plane is invalid.

  		var inverseNormalLength = 1.0 / this.normal.length()
  		this.normal.multiplyScalar(inverseNormalLength)
  		this.constant *= inverseNormalLength

  		return this
  	},

  	negate: function () {
  		this.constant *= -1
  		this.normal.negate()

  		return this
  	},

  	distanceToPoint: function (point) {
  		return this.normal.dot(point) + this.constant
  	},

  	distanceToSphere: function (sphere) {
  		return this.distanceToPoint(sphere.center) - sphere.radius
  	},

  	projectPoint: function (point, target) {
  		if (target === undefined) {
  			console.warn('THREE.Plane: .projectPoint() target is now required')
  			target = new Vector3()
  		}

  		return target.copy(this.normal).multiplyScalar(-this.distanceToPoint(point)).add(point)
  	},

  	intersectLine: (function () {
  		var v1 = new Vector3()

  		return function intersectLine (line, target) {
  			if (target === undefined) {
  				console.warn('THREE.Plane: .intersectLine() target is now required')
  				target = new Vector3()
  			}

  			var direction = line.delta(v1)

  			var denominator = this.normal.dot(direction)

  			if (denominator === 0) {
  				// line is coplanar, return origin
  				if (this.distanceToPoint(line.start) === 0) {
  					return target.copy(line.start)
  				}

  				// Unsure if this is the correct method to handle this case.
  				return undefined
  			}

  			var t = -(line.start.dot(this.normal) + this.constant) / denominator

  			if (t < 0 || t > 1) {
  				return undefined
  			}

  			return target.copy(direction).multiplyScalar(t).add(line.start)
  		}
  	}()),

  	intersectsLine: function (line) {
  		// Note: this tests if a line intersects the plane, not whether it (or its end-points) are coplanar with it.

  		var startSign = this.distanceToPoint(line.start)
  		var endSign = this.distanceToPoint(line.end)

  		return (startSign < 0 && endSign > 0) || (endSign < 0 && startSign > 0)
  	},

  	intersectsBox: function (box) {
  		return box.intersectsPlane(this)
  	},

  	intersectsSphere: function (sphere) {
  		return sphere.intersectsPlane(this)
  	},

  	coplanarPoint: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Plane: .coplanarPoint() target is now required')
  			target = new Vector3()
  		}

  		return target.copy(this.normal).multiplyScalar(-this.constant)
  	},

  	applyMatrix4: (function () {
  		var v1 = new Vector3()
  		var m1 = new Matrix3()

  		return function applyMatrix4 (matrix, optionalNormalMatrix) {
  			var normalMatrix = optionalNormalMatrix || m1.getNormalMatrix(matrix)

  			var referencePoint = this.coplanarPoint(v1).applyMatrix4(matrix)

  			var normal = this.normal.applyMatrix3(normalMatrix).normalize()

  			this.constant = -referencePoint.dot(normal)

  			return this
  		}
  	}()),

  	translate: function (offset) {
  		this.constant -= offset.dot(this.normal)

  		return this
  	},

  	equals: function (plane) {
  		return plane.normal.equals(this.normal) && (plane.constant === this.constant)
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   * @author bhouston / http://clara.io
   */

  function Frustum (p0, p1, p2, p3, p4, p5) {
  	this.planes = [

  		(p0 !== undefined) ? p0 : new Plane(),
  		(p1 !== undefined) ? p1 : new Plane(),
  		(p2 !== undefined) ? p2 : new Plane(),
  		(p3 !== undefined) ? p3 : new Plane(),
  		(p4 !== undefined) ? p4 : new Plane(),
  		(p5 !== undefined) ? p5 : new Plane()

  	]
  }

  Object.assign(Frustum.prototype, {

  	set: function (p0, p1, p2, p3, p4, p5) {
  		var planes = this.planes

  		planes[0].copy(p0)
  		planes[1].copy(p1)
  		planes[2].copy(p2)
  		planes[3].copy(p3)
  		planes[4].copy(p4)
  		planes[5].copy(p5)

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (frustum) {
  		var planes = this.planes

  		for (var i = 0; i < 6; i++) {
  			planes[i].copy(frustum.planes[i])
  		}

  		return this
  	},

  	setFromMatrix: function (m) {
  		var planes = this.planes
  		var me = m.elements
  		var me0 = me[0]; var me1 = me[1]; var me2 = me[2]; var me3 = me[3]
  		var me4 = me[4]; var me5 = me[5]; var me6 = me[6]; var me7 = me[7]
  		var me8 = me[8]; var me9 = me[9]; var me10 = me[10]; var me11 = me[11]
  		var me12 = me[12]; var me13 = me[13]; var me14 = me[14]; var me15 = me[15]

  		planes[0].setComponents(me3 - me0, me7 - me4, me11 - me8, me15 - me12).normalize()
  		planes[1].setComponents(me3 + me0, me7 + me4, me11 + me8, me15 + me12).normalize()
  		planes[2].setComponents(me3 + me1, me7 + me5, me11 + me9, me15 + me13).normalize()
  		planes[3].setComponents(me3 - me1, me7 - me5, me11 - me9, me15 - me13).normalize()
  		planes[4].setComponents(me3 - me2, me7 - me6, me11 - me10, me15 - me14).normalize()
  		planes[5].setComponents(me3 + me2, me7 + me6, me11 + me10, me15 + me14).normalize()

  		return this
  	},

  	intersectsObject: (function () {
  		var sphere = new Sphere()

  		return function intersectsObject (object) {
  			var geometry = object.geometry

  			if (geometry.boundingSphere === null) { geometry.computeBoundingSphere() }

  			sphere.copy(geometry.boundingSphere)
  				.applyMatrix4(object.matrixWorld)

  			return this.intersectsSphere(sphere)
  		}
  	}()),

  	intersectsSprite: (function () {
  		var sphere = new Sphere()

  		return function intersectsSprite (sprite) {
  			sphere.center.set(0, 0, 0)
  			sphere.radius = 0.7071067811865476
  			sphere.applyMatrix4(sprite.matrixWorld)

  			return this.intersectsSphere(sphere)
  		}
  	}()),

  	intersectsSphere: function (sphere) {
  		var planes = this.planes
  		var center = sphere.center
  		var negRadius = -sphere.radius

  		for (var i = 0; i < 6; i++) {
  			var distance = planes[i].distanceToPoint(center)

  			if (distance < negRadius) {
  				return false
  			}
  		}

  		return true
  	},

  	intersectsBox: (function () {
  		var p1 = new Vector3()
  			var p2 = new Vector3()

  		return function intersectsBox (box) {
  			var planes = this.planes

  			for (var i = 0; i < 6; i++) {
  				var plane = planes[i]

  				p1.x = plane.normal.x > 0 ? box.min.x : box.max.x
  				p2.x = plane.normal.x > 0 ? box.max.x : box.min.x
  				p1.y = plane.normal.y > 0 ? box.min.y : box.max.y
  				p2.y = plane.normal.y > 0 ? box.max.y : box.min.y
  				p1.z = plane.normal.z > 0 ? box.min.z : box.max.z
  				p2.z = plane.normal.z > 0 ? box.max.z : box.min.z

  				var d1 = plane.distanceToPoint(p1)
  				var d2 = plane.distanceToPoint(p2)

  				// if both outside plane, no intersection

  				if (d1 < 0 && d2 < 0) {
  					return false
  				}
  			}

  			return true
  		}
  	}()),

  	containsPoint: function (point) {
  		var planes = this.planes

  		for (var i = 0; i < 6; i++) {
  			if (planes[i].distanceToPoint(point) < 0) {
  				return false
  			}
  		}

  		return true
  	}

  })

  var alphamap_fragment = '#ifdef USE_ALPHAMAP\n\tdiffuseColor.a *= texture2D( alphaMap, vUv ).g;\n#endif\n'

  var alphamap_pars_fragment = '#ifdef USE_ALPHAMAP\n\tuniform sampler2D alphaMap;\n#endif\n'

  var alphatest_fragment = '#ifdef ALPHATEST\n\tif ( diffuseColor.a < ALPHATEST ) discard;\n#endif\n'

  var aomap_fragment = '#ifdef USE_AOMAP\n\tfloat ambientOcclusion = ( texture2D( aoMap, vUv2 ).r - 1.0 ) * aoMapIntensity + 1.0;\n\treflectedLight.indirectDiffuse *= ambientOcclusion;\n\t#if defined( USE_ENVMAP ) && defined( PHYSICAL )\n\t\tfloat dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );\n\t\treflectedLight.indirectSpecular *= computeSpecularOcclusion( dotNV, ambientOcclusion, material.specularRoughness );\n\t#endif\n#endif\n'

  var aomap_pars_fragment = '#ifdef USE_AOMAP\n\tuniform sampler2D aoMap;\n\tuniform float aoMapIntensity;\n#endif'

  var begin_vertex = '\nvec3 transformed = vec3( position );\n'

  var beginnormal_vertex = '\nvec3 objectNormal = vec3( normal );\n'

  var bsdfs = 'float punctualLightIntensityToIrradianceFactor( const in float lightDistance, const in float cutoffDistance, const in float decayExponent ) {\n\tif( decayExponent > 0.0 ) {\n#if defined ( PHYSICALLY_CORRECT_LIGHTS )\n\t\tfloat distanceFalloff = 1.0 / max( pow( lightDistance, decayExponent ), 0.01 );\n\t\tfloat maxDistanceCutoffFactor = pow2( saturate( 1.0 - pow4( lightDistance / cutoffDistance ) ) );\n\t\treturn distanceFalloff * maxDistanceCutoffFactor;\n#else\n\t\treturn pow( saturate( -lightDistance / cutoffDistance + 1.0 ), decayExponent );\n#endif\n\t}\n\treturn 1.0;\n}\nvec3 BRDF_Diffuse_Lambert( const in vec3 diffuseColor ) {\n\treturn RECIPROCAL_PI * diffuseColor;\n}\nvec3 F_Schlick( const in vec3 specularColor, const in float dotLH ) {\n\tfloat fresnel = exp2( ( -5.55473 * dotLH - 6.98316 ) * dotLH );\n\treturn ( 1.0 - specularColor ) * fresnel + specularColor;\n}\nfloat G_GGX_Smith( const in float alpha, const in float dotNL, const in float dotNV ) {\n\tfloat a2 = pow2( alpha );\n\tfloat gl = dotNL + sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );\n\tfloat gv = dotNV + sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );\n\treturn 1.0 / ( gl * gv );\n}\nfloat G_GGX_SmithCorrelated( const in float alpha, const in float dotNL, const in float dotNV ) {\n\tfloat a2 = pow2( alpha );\n\tfloat gv = dotNL * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNV ) );\n\tfloat gl = dotNV * sqrt( a2 + ( 1.0 - a2 ) * pow2( dotNL ) );\n\treturn 0.5 / max( gv + gl, EPSILON );\n}\nfloat D_GGX( const in float alpha, const in float dotNH ) {\n\tfloat a2 = pow2( alpha );\n\tfloat denom = pow2( dotNH ) * ( a2 - 1.0 ) + 1.0;\n\treturn RECIPROCAL_PI * a2 / pow2( denom );\n}\nvec3 BRDF_Specular_GGX( const in IncidentLight incidentLight, const in GeometricContext geometry, const in vec3 specularColor, const in float roughness ) {\n\tfloat alpha = pow2( roughness );\n\tvec3 halfDir = normalize( incidentLight.direction + geometry.viewDir );\n\tfloat dotNL = saturate( dot( geometry.normal, incidentLight.direction ) );\n\tfloat dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );\n\tfloat dotNH = saturate( dot( geometry.normal, halfDir ) );\n\tfloat dotLH = saturate( dot( incidentLight.direction, halfDir ) );\n\tvec3 F = F_Schlick( specularColor, dotLH );\n\tfloat G = G_GGX_SmithCorrelated( alpha, dotNL, dotNV );\n\tfloat D = D_GGX( alpha, dotNH );\n\treturn F * ( G * D );\n}\nvec2 LTC_Uv( const in vec3 N, const in vec3 V, const in float roughness ) {\n\tconst float LUT_SIZE  = 64.0;\n\tconst float LUT_SCALE = ( LUT_SIZE - 1.0 ) / LUT_SIZE;\n\tconst float LUT_BIAS  = 0.5 / LUT_SIZE;\n\tfloat dotNV = saturate( dot( N, V ) );\n\tvec2 uv = vec2( roughness, sqrt( 1.0 - dotNV ) );\n\tuv = uv * LUT_SCALE + LUT_BIAS;\n\treturn uv;\n}\nfloat LTC_ClippedSphereFormFactor( const in vec3 f ) {\n\tfloat l = length( f );\n\treturn max( ( l * l + f.z ) / ( l + 1.0 ), 0.0 );\n}\nvec3 LTC_EdgeVectorFormFactor( const in vec3 v1, const in vec3 v2 ) {\n\tfloat x = dot( v1, v2 );\n\tfloat y = abs( x );\n\tfloat a = 0.8543985 + ( 0.4965155 + 0.0145206 * y ) * y;\n\tfloat b = 3.4175940 + ( 4.1616724 + y ) * y;\n\tfloat v = a / b;\n\tfloat theta_sintheta = ( x > 0.0 ) ? v : 0.5 * inversesqrt( max( 1.0 - x * x, 1e-7 ) ) - v;\n\treturn cross( v1, v2 ) * theta_sintheta;\n}\nvec3 LTC_Evaluate( const in vec3 N, const in vec3 V, const in vec3 P, const in mat3 mInv, const in vec3 rectCoords[ 4 ] ) {\n\tvec3 v1 = rectCoords[ 1 ] - rectCoords[ 0 ];\n\tvec3 v2 = rectCoords[ 3 ] - rectCoords[ 0 ];\n\tvec3 lightNormal = cross( v1, v2 );\n\tif( dot( lightNormal, P - rectCoords[ 0 ] ) < 0.0 ) return vec3( 0.0 );\n\tvec3 T1, T2;\n\tT1 = normalize( V - N * dot( V, N ) );\n\tT2 = - cross( N, T1 );\n\tmat3 mat = mInv * transposeMat3( mat3( T1, T2, N ) );\n\tvec3 coords[ 4 ];\n\tcoords[ 0 ] = mat * ( rectCoords[ 0 ] - P );\n\tcoords[ 1 ] = mat * ( rectCoords[ 1 ] - P );\n\tcoords[ 2 ] = mat * ( rectCoords[ 2 ] - P );\n\tcoords[ 3 ] = mat * ( rectCoords[ 3 ] - P );\n\tcoords[ 0 ] = normalize( coords[ 0 ] );\n\tcoords[ 1 ] = normalize( coords[ 1 ] );\n\tcoords[ 2 ] = normalize( coords[ 2 ] );\n\tcoords[ 3 ] = normalize( coords[ 3 ] );\n\tvec3 vectorFormFactor = vec3( 0.0 );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 0 ], coords[ 1 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 1 ], coords[ 2 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 2 ], coords[ 3 ] );\n\tvectorFormFactor += LTC_EdgeVectorFormFactor( coords[ 3 ], coords[ 0 ] );\n\tfloat result = LTC_ClippedSphereFormFactor( vectorFormFactor );\n\treturn vec3( result );\n}\nvec3 BRDF_Specular_GGX_Environment( const in GeometricContext geometry, const in vec3 specularColor, const in float roughness ) {\n\tfloat dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );\n\tconst vec4 c0 = vec4( - 1, - 0.0275, - 0.572, 0.022 );\n\tconst vec4 c1 = vec4( 1, 0.0425, 1.04, - 0.04 );\n\tvec4 r = roughness * c0 + c1;\n\tfloat a004 = min( r.x * r.x, exp2( - 9.28 * dotNV ) ) * r.x + r.y;\n\tvec2 AB = vec2( -1.04, 1.04 ) * a004 + r.zw;\n\treturn specularColor * AB.x + AB.y;\n}\nfloat G_BlinnPhong_Implicit( ) {\n\treturn 0.25;\n}\nfloat D_BlinnPhong( const in float shininess, const in float dotNH ) {\n\treturn RECIPROCAL_PI * ( shininess * 0.5 + 1.0 ) * pow( dotNH, shininess );\n}\nvec3 BRDF_Specular_BlinnPhong( const in IncidentLight incidentLight, const in GeometricContext geometry, const in vec3 specularColor, const in float shininess ) {\n\tvec3 halfDir = normalize( incidentLight.direction + geometry.viewDir );\n\tfloat dotNH = saturate( dot( geometry.normal, halfDir ) );\n\tfloat dotLH = saturate( dot( incidentLight.direction, halfDir ) );\n\tvec3 F = F_Schlick( specularColor, dotLH );\n\tfloat G = G_BlinnPhong_Implicit( );\n\tfloat D = D_BlinnPhong( shininess, dotNH );\n\treturn F * ( G * D );\n}\nfloat GGXRoughnessToBlinnExponent( const in float ggxRoughness ) {\n\treturn ( 2.0 / pow2( ggxRoughness + 0.0001 ) - 2.0 );\n}\nfloat BlinnExponentToGGXRoughness( const in float blinnExponent ) {\n\treturn sqrt( 2.0 / ( blinnExponent + 2.0 ) );\n}\n'

  var bumpmap_pars_fragment = '#ifdef USE_BUMPMAP\n\tuniform sampler2D bumpMap;\n\tuniform float bumpScale;\n\tvec2 dHdxy_fwd() {\n\t\tvec2 dSTdx = dFdx( vUv );\n\t\tvec2 dSTdy = dFdy( vUv );\n\t\tfloat Hll = bumpScale * texture2D( bumpMap, vUv ).x;\n\t\tfloat dBx = bumpScale * texture2D( bumpMap, vUv + dSTdx ).x - Hll;\n\t\tfloat dBy = bumpScale * texture2D( bumpMap, vUv + dSTdy ).x - Hll;\n\t\treturn vec2( dBx, dBy );\n\t}\n\tvec3 perturbNormalArb( vec3 surf_pos, vec3 surf_norm, vec2 dHdxy ) {\n\t\tvec3 vSigmaX = vec3( dFdx( surf_pos.x ), dFdx( surf_pos.y ), dFdx( surf_pos.z ) );\n\t\tvec3 vSigmaY = vec3( dFdy( surf_pos.x ), dFdy( surf_pos.y ), dFdy( surf_pos.z ) );\n\t\tvec3 vN = surf_norm;\n\t\tvec3 R1 = cross( vSigmaY, vN );\n\t\tvec3 R2 = cross( vN, vSigmaX );\n\t\tfloat fDet = dot( vSigmaX, R1 );\n\t\tfDet *= ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\tvec3 vGrad = sign( fDet ) * ( dHdxy.x * R1 + dHdxy.y * R2 );\n\t\treturn normalize( abs( fDet ) * surf_norm - vGrad );\n\t}\n#endif\n'

  var clipping_planes_fragment = '#if NUM_CLIPPING_PLANES > 0\n\tvec4 plane;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < UNION_CLIPPING_PLANES; i ++ ) {\n\t\tplane = clippingPlanes[ i ];\n\t\tif ( dot( vViewPosition, plane.xyz ) > plane.w ) discard;\n\t}\n\t#if UNION_CLIPPING_PLANES < NUM_CLIPPING_PLANES\n\t\tbool clipped = true;\n\t\t#pragma unroll_loop\n\t\tfor ( int i = UNION_CLIPPING_PLANES; i < NUM_CLIPPING_PLANES; i ++ ) {\n\t\t\tplane = clippingPlanes[ i ];\n\t\t\tclipped = ( dot( vViewPosition, plane.xyz ) > plane.w ) && clipped;\n\t\t}\n\t\tif ( clipped ) discard;\n\t#endif\n#endif\n'

  var clipping_planes_pars_fragment = '#if NUM_CLIPPING_PLANES > 0\n\t#if ! defined( PHYSICAL ) && ! defined( PHONG )\n\t\tvarying vec3 vViewPosition;\n\t#endif\n\tuniform vec4 clippingPlanes[ NUM_CLIPPING_PLANES ];\n#endif\n'

  var clipping_planes_pars_vertex = '#if NUM_CLIPPING_PLANES > 0 && ! defined( PHYSICAL ) && ! defined( PHONG )\n\tvarying vec3 vViewPosition;\n#endif\n'

  var clipping_planes_vertex = '#if NUM_CLIPPING_PLANES > 0 && ! defined( PHYSICAL ) && ! defined( PHONG )\n\tvViewPosition = - mvPosition.xyz;\n#endif\n'

  var color_fragment = '#ifdef USE_COLOR\n\tdiffuseColor.rgb *= vColor;\n#endif'

  var color_pars_fragment = '#ifdef USE_COLOR\n\tvarying vec3 vColor;\n#endif\n'

  var color_pars_vertex = '#ifdef USE_COLOR\n\tvarying vec3 vColor;\n#endif'

  var color_vertex = '#ifdef USE_COLOR\n\tvColor.xyz = color.xyz;\n#endif'

  var common = '#define PI 3.14159265359\n#define PI2 6.28318530718\n#define PI_HALF 1.5707963267949\n#define RECIPROCAL_PI 0.31830988618\n#define RECIPROCAL_PI2 0.15915494\n#define LOG2 1.442695\n#define EPSILON 1e-6\n#define saturate(a) clamp( a, 0.0, 1.0 )\n#define whiteCompliment(a) ( 1.0 - saturate( a ) )\nfloat pow2( const in float x ) { return x*x; }\nfloat pow3( const in float x ) { return x*x*x; }\nfloat pow4( const in float x ) { float x2 = x*x; return x2*x2; }\nfloat average( const in vec3 color ) { return dot( color, vec3( 0.3333 ) ); }\nhighp float rand( const in vec2 uv ) {\n\tconst highp float a = 12.9898, b = 78.233, c = 43758.5453;\n\thighp float dt = dot( uv.xy, vec2( a,b ) ), sn = mod( dt, PI );\n\treturn fract(sin(sn) * c);\n}\nstruct IncidentLight {\n\tvec3 color;\n\tvec3 direction;\n\tbool visible;\n};\nstruct ReflectedLight {\n\tvec3 directDiffuse;\n\tvec3 directSpecular;\n\tvec3 indirectDiffuse;\n\tvec3 indirectSpecular;\n};\nstruct GeometricContext {\n\tvec3 position;\n\tvec3 normal;\n\tvec3 viewDir;\n};\nvec3 transformDirection( in vec3 dir, in mat4 matrix ) {\n\treturn normalize( ( matrix * vec4( dir, 0.0 ) ).xyz );\n}\nvec3 inverseTransformDirection( in vec3 dir, in mat4 matrix ) {\n\treturn normalize( ( vec4( dir, 0.0 ) * matrix ).xyz );\n}\nvec3 projectOnPlane(in vec3 point, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\tfloat distance = dot( planeNormal, point - pointOnPlane );\n\treturn - distance * planeNormal + point;\n}\nfloat sideOfPlane( in vec3 point, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\treturn sign( dot( point - pointOnPlane, planeNormal ) );\n}\nvec3 linePlaneIntersect( in vec3 pointOnLine, in vec3 lineDirection, in vec3 pointOnPlane, in vec3 planeNormal ) {\n\treturn lineDirection * ( dot( planeNormal, pointOnPlane - pointOnLine ) / dot( planeNormal, lineDirection ) ) + pointOnLine;\n}\nmat3 transposeMat3( const in mat3 m ) {\n\tmat3 tmp;\n\ttmp[ 0 ] = vec3( m[ 0 ].x, m[ 1 ].x, m[ 2 ].x );\n\ttmp[ 1 ] = vec3( m[ 0 ].y, m[ 1 ].y, m[ 2 ].y );\n\ttmp[ 2 ] = vec3( m[ 0 ].z, m[ 1 ].z, m[ 2 ].z );\n\treturn tmp;\n}\nfloat linearToRelativeLuminance( const in vec3 color ) {\n\tvec3 weights = vec3( 0.2126, 0.7152, 0.0722 );\n\treturn dot( weights, color.rgb );\n}\n'

  var cube_uv_reflection_fragment = '#ifdef ENVMAP_TYPE_CUBE_UV\n#define cubeUV_textureSize (1024.0)\nint getFaceFromDirection(vec3 direction) {\n\tvec3 absDirection = abs(direction);\n\tint face = -1;\n\tif( absDirection.x > absDirection.z ) {\n\t\tif(absDirection.x > absDirection.y )\n\t\t\tface = direction.x > 0.0 ? 0 : 3;\n\t\telse\n\t\t\tface = direction.y > 0.0 ? 1 : 4;\n\t}\n\telse {\n\t\tif(absDirection.z > absDirection.y )\n\t\t\tface = direction.z > 0.0 ? 2 : 5;\n\t\telse\n\t\t\tface = direction.y > 0.0 ? 1 : 4;\n\t}\n\treturn face;\n}\n#define cubeUV_maxLods1  (log2(cubeUV_textureSize*0.25) - 1.0)\n#define cubeUV_rangeClamp (exp2((6.0 - 1.0) * 2.0))\nvec2 MipLevelInfo( vec3 vec, float roughnessLevel, float roughness ) {\n\tfloat scale = exp2(cubeUV_maxLods1 - roughnessLevel);\n\tfloat dxRoughness = dFdx(roughness);\n\tfloat dyRoughness = dFdy(roughness);\n\tvec3 dx = dFdx( vec * scale * dxRoughness );\n\tvec3 dy = dFdy( vec * scale * dyRoughness );\n\tfloat d = max( dot( dx, dx ), dot( dy, dy ) );\n\td = clamp(d, 1.0, cubeUV_rangeClamp);\n\tfloat mipLevel = 0.5 * log2(d);\n\treturn vec2(floor(mipLevel), fract(mipLevel));\n}\n#define cubeUV_maxLods2 (log2(cubeUV_textureSize*0.25) - 2.0)\n#define cubeUV_rcpTextureSize (1.0 / cubeUV_textureSize)\nvec2 getCubeUV(vec3 direction, float roughnessLevel, float mipLevel) {\n\tmipLevel = roughnessLevel > cubeUV_maxLods2 - 3.0 ? 0.0 : mipLevel;\n\tfloat a = 16.0 * cubeUV_rcpTextureSize;\n\tvec2 exp2_packed = exp2( vec2( roughnessLevel, mipLevel ) );\n\tvec2 rcp_exp2_packed = vec2( 1.0 ) / exp2_packed;\n\tfloat powScale = exp2_packed.x * exp2_packed.y;\n\tfloat scale = rcp_exp2_packed.x * rcp_exp2_packed.y * 0.25;\n\tfloat mipOffset = 0.75*(1.0 - rcp_exp2_packed.y) * rcp_exp2_packed.x;\n\tbool bRes = mipLevel == 0.0;\n\tscale =  bRes && (scale < a) ? a : scale;\n\tvec3 r;\n\tvec2 offset;\n\tint face = getFaceFromDirection(direction);\n\tfloat rcpPowScale = 1.0 / powScale;\n\tif( face == 0) {\n\t\tr = vec3(direction.x, -direction.z, direction.y);\n\t\toffset = vec2(0.0+mipOffset,0.75 * rcpPowScale);\n\t\toffset.y = bRes && (offset.y < 2.0*a) ? a : offset.y;\n\t}\n\telse if( face == 1) {\n\t\tr = vec3(direction.y, direction.x, direction.z);\n\t\toffset = vec2(scale+mipOffset, 0.75 * rcpPowScale);\n\t\toffset.y = bRes && (offset.y < 2.0*a) ? a : offset.y;\n\t}\n\telse if( face == 2) {\n\t\tr = vec3(direction.z, direction.x, direction.y);\n\t\toffset = vec2(2.0*scale+mipOffset, 0.75 * rcpPowScale);\n\t\toffset.y = bRes && (offset.y < 2.0*a) ? a : offset.y;\n\t}\n\telse if( face == 3) {\n\t\tr = vec3(direction.x, direction.z, direction.y);\n\t\toffset = vec2(0.0+mipOffset,0.5 * rcpPowScale);\n\t\toffset.y = bRes && (offset.y < 2.0*a) ? 0.0 : offset.y;\n\t}\n\telse if( face == 4) {\n\t\tr = vec3(direction.y, direction.x, -direction.z);\n\t\toffset = vec2(scale+mipOffset, 0.5 * rcpPowScale);\n\t\toffset.y = bRes && (offset.y < 2.0*a) ? 0.0 : offset.y;\n\t}\n\telse {\n\t\tr = vec3(direction.z, -direction.x, direction.y);\n\t\toffset = vec2(2.0*scale+mipOffset, 0.5 * rcpPowScale);\n\t\toffset.y = bRes && (offset.y < 2.0*a) ? 0.0 : offset.y;\n\t}\n\tr = normalize(r);\n\tfloat texelOffset = 0.5 * cubeUV_rcpTextureSize;\n\tvec2 s = ( r.yz / abs( r.x ) + vec2( 1.0 ) ) * 0.5;\n\tvec2 base = offset + vec2( texelOffset );\n\treturn base + s * ( scale - 2.0 * texelOffset );\n}\n#define cubeUV_maxLods3 (log2(cubeUV_textureSize*0.25) - 3.0)\nvec4 textureCubeUV(vec3 reflectedDirection, float roughness ) {\n\tfloat roughnessVal = roughness* cubeUV_maxLods3;\n\tfloat r1 = floor(roughnessVal);\n\tfloat r2 = r1 + 1.0;\n\tfloat t = fract(roughnessVal);\n\tvec2 mipInfo = MipLevelInfo(reflectedDirection, r1, roughness);\n\tfloat s = mipInfo.y;\n\tfloat level0 = mipInfo.x;\n\tfloat level1 = level0 + 1.0;\n\tlevel1 = level1 > 5.0 ? 5.0 : level1;\n\tlevel0 += min( floor( s + 0.5 ), 5.0 );\n\tvec2 uv_10 = getCubeUV(reflectedDirection, r1, level0);\n\tvec4 color10 = envMapTexelToLinear(texture2D(envMap, uv_10));\n\tvec2 uv_20 = getCubeUV(reflectedDirection, r2, level0);\n\tvec4 color20 = envMapTexelToLinear(texture2D(envMap, uv_20));\n\tvec4 result = mix(color10, color20, t);\n\treturn vec4(result.rgb, 1.0);\n}\n#endif\n'

  var defaultnormal_vertex = 'vec3 transformedNormal = normalMatrix * objectNormal;\n#ifdef FLIP_SIDED\n\ttransformedNormal = - transformedNormal;\n#endif\n'

  var displacementmap_pars_vertex = '#ifdef USE_DISPLACEMENTMAP\n\tuniform sampler2D displacementMap;\n\tuniform float displacementScale;\n\tuniform float displacementBias;\n#endif\n'

  var displacementmap_vertex = '#ifdef USE_DISPLACEMENTMAP\n\ttransformed += normalize( objectNormal ) * ( texture2D( displacementMap, uv ).x * displacementScale + displacementBias );\n#endif\n'

  var emissivemap_fragment = '#ifdef USE_EMISSIVEMAP\n\tvec4 emissiveColor = texture2D( emissiveMap, vUv );\n\temissiveColor.rgb = emissiveMapTexelToLinear( emissiveColor ).rgb;\n\ttotalEmissiveRadiance *= emissiveColor.rgb;\n#endif\n'

  var emissivemap_pars_fragment = '#ifdef USE_EMISSIVEMAP\n\tuniform sampler2D emissiveMap;\n#endif\n'

  var encodings_fragment = '  gl_FragColor = linearToOutputTexel( gl_FragColor );\n'

  var encodings_pars_fragment = '\nvec4 LinearToLinear( in vec4 value ) {\n\treturn value;\n}\nvec4 GammaToLinear( in vec4 value, in float gammaFactor ) {\n\treturn vec4( pow( value.xyz, vec3( gammaFactor ) ), value.w );\n}\nvec4 LinearToGamma( in vec4 value, in float gammaFactor ) {\n\treturn vec4( pow( value.xyz, vec3( 1.0 / gammaFactor ) ), value.w );\n}\nvec4 sRGBToLinear( in vec4 value ) {\n\treturn vec4( mix( pow( value.rgb * 0.9478672986 + vec3( 0.0521327014 ), vec3( 2.4 ) ), value.rgb * 0.0773993808, vec3( lessThanEqual( value.rgb, vec3( 0.04045 ) ) ) ), value.w );\n}\nvec4 LinearTosRGB( in vec4 value ) {\n\treturn vec4( mix( pow( value.rgb, vec3( 0.41666 ) ) * 1.055 - vec3( 0.055 ), value.rgb * 12.92, vec3( lessThanEqual( value.rgb, vec3( 0.0031308 ) ) ) ), value.w );\n}\nvec4 RGBEToLinear( in vec4 value ) {\n\treturn vec4( value.rgb * exp2( value.a * 255.0 - 128.0 ), 1.0 );\n}\nvec4 LinearToRGBE( in vec4 value ) {\n\tfloat maxComponent = max( max( value.r, value.g ), value.b );\n\tfloat fExp = clamp( ceil( log2( maxComponent ) ), -128.0, 127.0 );\n\treturn vec4( value.rgb / exp2( fExp ), ( fExp + 128.0 ) / 255.0 );\n}\nvec4 RGBMToLinear( in vec4 value, in float maxRange ) {\n\treturn vec4( value.xyz * value.w * maxRange, 1.0 );\n}\nvec4 LinearToRGBM( in vec4 value, in float maxRange ) {\n\tfloat maxRGB = max( value.x, max( value.g, value.b ) );\n\tfloat M      = clamp( maxRGB / maxRange, 0.0, 1.0 );\n\tM            = ceil( M * 255.0 ) / 255.0;\n\treturn vec4( value.rgb / ( M * maxRange ), M );\n}\nvec4 RGBDToLinear( in vec4 value, in float maxRange ) {\n\treturn vec4( value.rgb * ( ( maxRange / 255.0 ) / value.a ), 1.0 );\n}\nvec4 LinearToRGBD( in vec4 value, in float maxRange ) {\n\tfloat maxRGB = max( value.x, max( value.g, value.b ) );\n\tfloat D      = max( maxRange / maxRGB, 1.0 );\n\tD            = min( floor( D ) / 255.0, 1.0 );\n\treturn vec4( value.rgb * ( D * ( 255.0 / maxRange ) ), D );\n}\nconst mat3 cLogLuvM = mat3( 0.2209, 0.3390, 0.4184, 0.1138, 0.6780, 0.7319, 0.0102, 0.1130, 0.2969 );\nvec4 LinearToLogLuv( in vec4 value )  {\n\tvec3 Xp_Y_XYZp = value.rgb * cLogLuvM;\n\tXp_Y_XYZp = max(Xp_Y_XYZp, vec3(1e-6, 1e-6, 1e-6));\n\tvec4 vResult;\n\tvResult.xy = Xp_Y_XYZp.xy / Xp_Y_XYZp.z;\n\tfloat Le = 2.0 * log2(Xp_Y_XYZp.y) + 127.0;\n\tvResult.w = fract(Le);\n\tvResult.z = (Le - (floor(vResult.w*255.0))/255.0)/255.0;\n\treturn vResult;\n}\nconst mat3 cLogLuvInverseM = mat3( 6.0014, -2.7008, -1.7996, -1.3320, 3.1029, -5.7721, 0.3008, -1.0882, 5.6268 );\nvec4 LogLuvToLinear( in vec4 value ) {\n\tfloat Le = value.z * 255.0 + value.w;\n\tvec3 Xp_Y_XYZp;\n\tXp_Y_XYZp.y = exp2((Le - 127.0) / 2.0);\n\tXp_Y_XYZp.z = Xp_Y_XYZp.y / value.y;\n\tXp_Y_XYZp.x = value.x * Xp_Y_XYZp.z;\n\tvec3 vRGB = Xp_Y_XYZp.rgb * cLogLuvInverseM;\n\treturn vec4( max(vRGB, 0.0), 1.0 );\n}\n'

  var envmap_fragment = '#ifdef USE_ENVMAP\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG )\n\t\tvec3 cameraToVertex = normalize( vWorldPosition - cameraPosition );\n\t\tvec3 worldNormal = inverseTransformDirection( normal, viewMatrix );\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvec3 reflectVec = reflect( cameraToVertex, worldNormal );\n\t\t#else\n\t\t\tvec3 reflectVec = refract( cameraToVertex, worldNormal, refractionRatio );\n\t\t#endif\n\t#else\n\t\tvec3 reflectVec = vReflect;\n\t#endif\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tvec4 envColor = textureCube( envMap, vec3( flipEnvMap * reflectVec.x, reflectVec.yz ) );\n\t#elif defined( ENVMAP_TYPE_EQUIREC )\n\t\tvec2 sampleUV;\n\t\treflectVec = normalize( reflectVec );\n\t\tsampleUV.y = asin( clamp( reflectVec.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;\n\t\tsampleUV.x = atan( reflectVec.z, reflectVec.x ) * RECIPROCAL_PI2 + 0.5;\n\t\tvec4 envColor = texture2D( envMap, sampleUV );\n\t#elif defined( ENVMAP_TYPE_SPHERE )\n\t\treflectVec = normalize( reflectVec );\n\t\tvec3 reflectView = normalize( ( viewMatrix * vec4( reflectVec, 0.0 ) ).xyz + vec3( 0.0, 0.0, 1.0 ) );\n\t\tvec4 envColor = texture2D( envMap, reflectView.xy * 0.5 + 0.5 );\n\t#else\n\t\tvec4 envColor = vec4( 0.0 );\n\t#endif\n\tenvColor = envMapTexelToLinear( envColor );\n\t#ifdef ENVMAP_BLENDING_MULTIPLY\n\t\toutgoingLight = mix( outgoingLight, outgoingLight * envColor.xyz, specularStrength * reflectivity );\n\t#elif defined( ENVMAP_BLENDING_MIX )\n\t\toutgoingLight = mix( outgoingLight, envColor.xyz, specularStrength * reflectivity );\n\t#elif defined( ENVMAP_BLENDING_ADD )\n\t\toutgoingLight += envColor.xyz * specularStrength * reflectivity;\n\t#endif\n#endif\n'

  var envmap_pars_fragment = '#if defined( USE_ENVMAP ) || defined( PHYSICAL )\n\tuniform float reflectivity;\n\tuniform float envMapIntensity;\n#endif\n#ifdef USE_ENVMAP\n\t#if ! defined( PHYSICAL ) && ( defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG ) )\n\t\tvarying vec3 vWorldPosition;\n\t#endif\n\t#ifdef ENVMAP_TYPE_CUBE\n\t\tuniform samplerCube envMap;\n\t#else\n\t\tuniform sampler2D envMap;\n\t#endif\n\tuniform float flipEnvMap;\n\tuniform int maxMipLevel;\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG ) || defined( PHYSICAL )\n\t\tuniform float refractionRatio;\n\t#else\n\t\tvarying vec3 vReflect;\n\t#endif\n#endif\n'

  var envmap_pars_vertex = '#ifdef USE_ENVMAP\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG )\n\t\tvarying vec3 vWorldPosition;\n\t#else\n\t\tvarying vec3 vReflect;\n\t\tuniform float refractionRatio;\n\t#endif\n#endif\n'

  var envmap_vertex = '#ifdef USE_ENVMAP\n\t#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG )\n\t\tvWorldPosition = worldPosition.xyz;\n\t#else\n\t\tvec3 cameraToVertex = normalize( worldPosition.xyz - cameraPosition );\n\t\tvec3 worldNormal = inverseTransformDirection( transformedNormal, viewMatrix );\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvReflect = reflect( cameraToVertex, worldNormal );\n\t\t#else\n\t\t\tvReflect = refract( cameraToVertex, worldNormal, refractionRatio );\n\t\t#endif\n\t#endif\n#endif\n'

  var fog_vertex = '\n#ifdef USE_FOG\nfogDepth = -mvPosition.z;\n#endif'

  var fog_pars_vertex = '#ifdef USE_FOG\n  varying float fogDepth;\n#endif\n'

  var fog_fragment = '#ifdef USE_FOG\n\t#ifdef FOG_EXP2\n\t\tfloat fogFactor = whiteCompliment( exp2( - fogDensity * fogDensity * fogDepth * fogDepth * LOG2 ) );\n\t#else\n\t\tfloat fogFactor = smoothstep( fogNear, fogFar, fogDepth );\n\t#endif\n\tgl_FragColor.rgb = mix( gl_FragColor.rgb, fogColor, fogFactor );\n#endif\n'

  var fog_pars_fragment = '#ifdef USE_FOG\n\tuniform vec3 fogColor;\n\tvarying float fogDepth;\n\t#ifdef FOG_EXP2\n\t\tuniform float fogDensity;\n\t#else\n\t\tuniform float fogNear;\n\t\tuniform float fogFar;\n\t#endif\n#endif\n'

  var gradientmap_pars_fragment = '#ifdef TOON\n\tuniform sampler2D gradientMap;\n\tvec3 getGradientIrradiance( vec3 normal, vec3 lightDirection ) {\n\t\tfloat dotNL = dot( normal, lightDirection );\n\t\tvec2 coord = vec2( dotNL * 0.5 + 0.5, 0.0 );\n\t\t#ifdef USE_GRADIENTMAP\n\t\t\treturn texture2D( gradientMap, coord ).rgb;\n\t\t#else\n\t\t\treturn ( coord.x < 0.7 ) ? vec3( 0.7 ) : vec3( 1.0 );\n\t\t#endif\n\t}\n#endif\n'

  var lightmap_fragment = '#ifdef USE_LIGHTMAP\n\treflectedLight.indirectDiffuse += PI * texture2D( lightMap, vUv2 ).xyz * lightMapIntensity;\n#endif\n'

  var lightmap_pars_fragment = '#ifdef USE_LIGHTMAP\n\tuniform sampler2D lightMap;\n\tuniform float lightMapIntensity;\n#endif'

  var lights_lambert_vertex = 'vec3 diffuse = vec3( 1.0 );\nGeometricContext geometry;\ngeometry.position = mvPosition.xyz;\ngeometry.normal = normalize( transformedNormal );\ngeometry.viewDir = normalize( -mvPosition.xyz );\nGeometricContext backGeometry;\nbackGeometry.position = geometry.position;\nbackGeometry.normal = -geometry.normal;\nbackGeometry.viewDir = geometry.viewDir;\nvLightFront = vec3( 0.0 );\n#ifdef DOUBLE_SIDED\n\tvLightBack = vec3( 0.0 );\n#endif\nIncidentLight directLight;\nfloat dotNL;\nvec3 directLightColor_Diffuse;\n#if NUM_POINT_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tgetPointDirectLightIrradiance( pointLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n#endif\n#if NUM_SPOT_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tgetSpotDirectLightIrradiance( spotLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n#endif\n#if NUM_DIR_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tgetDirectionalDirectLightIrradiance( directionalLights[ i ], geometry, directLight );\n\t\tdotNL = dot( geometry.normal, directLight.direction );\n\t\tdirectLightColor_Diffuse = PI * directLight.color;\n\t\tvLightFront += saturate( dotNL ) * directLightColor_Diffuse;\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += saturate( -dotNL ) * directLightColor_Diffuse;\n\t\t#endif\n\t}\n#endif\n#if NUM_HEMI_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {\n\t\tvLightFront += getHemisphereLightIrradiance( hemisphereLights[ i ], geometry );\n\t\t#ifdef DOUBLE_SIDED\n\t\t\tvLightBack += getHemisphereLightIrradiance( hemisphereLights[ i ], backGeometry );\n\t\t#endif\n\t}\n#endif\n'

  var lights_pars_begin = 'uniform vec3 ambientLightColor;\nvec3 getAmbientLightIrradiance( const in vec3 ambientLightColor ) {\n\tvec3 irradiance = ambientLightColor;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\treturn irradiance;\n}\n#if NUM_DIR_LIGHTS > 0\n\tstruct DirectionalLight {\n\t\tvec3 direction;\n\t\tvec3 color;\n\t\tint shadow;\n\t\tfloat shadowBias;\n\t\tfloat shadowRadius;\n\t\tvec2 shadowMapSize;\n\t};\n\tuniform DirectionalLight directionalLights[ NUM_DIR_LIGHTS ];\n\tvoid getDirectionalDirectLightIrradiance( const in DirectionalLight directionalLight, const in GeometricContext geometry, out IncidentLight directLight ) {\n\t\tdirectLight.color = directionalLight.color;\n\t\tdirectLight.direction = directionalLight.direction;\n\t\tdirectLight.visible = true;\n\t}\n#endif\n#if NUM_POINT_LIGHTS > 0\n\tstruct PointLight {\n\t\tvec3 position;\n\t\tvec3 color;\n\t\tfloat distance;\n\t\tfloat decay;\n\t\tint shadow;\n\t\tfloat shadowBias;\n\t\tfloat shadowRadius;\n\t\tvec2 shadowMapSize;\n\t\tfloat shadowCameraNear;\n\t\tfloat shadowCameraFar;\n\t};\n\tuniform PointLight pointLights[ NUM_POINT_LIGHTS ];\n\tvoid getPointDirectLightIrradiance( const in PointLight pointLight, const in GeometricContext geometry, out IncidentLight directLight ) {\n\t\tvec3 lVector = pointLight.position - geometry.position;\n\t\tdirectLight.direction = normalize( lVector );\n\t\tfloat lightDistance = length( lVector );\n\t\tdirectLight.color = pointLight.color;\n\t\tdirectLight.color *= punctualLightIntensityToIrradianceFactor( lightDistance, pointLight.distance, pointLight.decay );\n\t\tdirectLight.visible = ( directLight.color != vec3( 0.0 ) );\n\t}\n#endif\n#if NUM_SPOT_LIGHTS > 0\n\tstruct SpotLight {\n\t\tvec3 position;\n\t\tvec3 direction;\n\t\tvec3 color;\n\t\tfloat distance;\n\t\tfloat decay;\n\t\tfloat coneCos;\n\t\tfloat penumbraCos;\n\t\tint shadow;\n\t\tfloat shadowBias;\n\t\tfloat shadowRadius;\n\t\tvec2 shadowMapSize;\n\t};\n\tuniform SpotLight spotLights[ NUM_SPOT_LIGHTS ];\n\tvoid getSpotDirectLightIrradiance( const in SpotLight spotLight, const in GeometricContext geometry, out IncidentLight directLight  ) {\n\t\tvec3 lVector = spotLight.position - geometry.position;\n\t\tdirectLight.direction = normalize( lVector );\n\t\tfloat lightDistance = length( lVector );\n\t\tfloat angleCos = dot( directLight.direction, spotLight.direction );\n\t\tif ( angleCos > spotLight.coneCos ) {\n\t\t\tfloat spotEffect = smoothstep( spotLight.coneCos, spotLight.penumbraCos, angleCos );\n\t\t\tdirectLight.color = spotLight.color;\n\t\t\tdirectLight.color *= spotEffect * punctualLightIntensityToIrradianceFactor( lightDistance, spotLight.distance, spotLight.decay );\n\t\t\tdirectLight.visible = true;\n\t\t} else {\n\t\t\tdirectLight.color = vec3( 0.0 );\n\t\t\tdirectLight.visible = false;\n\t\t}\n\t}\n#endif\n#if NUM_RECT_AREA_LIGHTS > 0\n\tstruct RectAreaLight {\n\t\tvec3 color;\n\t\tvec3 position;\n\t\tvec3 halfWidth;\n\t\tvec3 halfHeight;\n\t};\n\tuniform sampler2D ltc_1;\tuniform sampler2D ltc_2;\n\tuniform RectAreaLight rectAreaLights[ NUM_RECT_AREA_LIGHTS ];\n#endif\n#if NUM_HEMI_LIGHTS > 0\n\tstruct HemisphereLight {\n\t\tvec3 direction;\n\t\tvec3 skyColor;\n\t\tvec3 groundColor;\n\t};\n\tuniform HemisphereLight hemisphereLights[ NUM_HEMI_LIGHTS ];\n\tvec3 getHemisphereLightIrradiance( const in HemisphereLight hemiLight, const in GeometricContext geometry ) {\n\t\tfloat dotNL = dot( geometry.normal, hemiLight.direction );\n\t\tfloat hemiDiffuseWeight = 0.5 * dotNL + 0.5;\n\t\tvec3 irradiance = mix( hemiLight.groundColor, hemiLight.skyColor, hemiDiffuseWeight );\n\t\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\t\tirradiance *= PI;\n\t\t#endif\n\t\treturn irradiance;\n\t}\n#endif\n'

  var lights_pars_maps = '#if defined( USE_ENVMAP ) && defined( PHYSICAL )\n\tvec3 getLightProbeIndirectIrradiance( const in GeometricContext geometry, const in int maxMIPLevel ) {\n\t\tvec3 worldNormal = inverseTransformDirection( geometry.normal, viewMatrix );\n\t\t#ifdef ENVMAP_TYPE_CUBE\n\t\t\tvec3 queryVec = vec3( flipEnvMap * worldNormal.x, worldNormal.yz );\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = textureCubeLodEXT( envMap, queryVec, float( maxMIPLevel ) );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = textureCube( envMap, queryVec, float( maxMIPLevel ) );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\t\tvec3 queryVec = vec3( flipEnvMap * worldNormal.x, worldNormal.yz );\n\t\t\tvec4 envMapColor = textureCubeUV( queryVec, 1.0 );\n\t\t#else\n\t\t\tvec4 envMapColor = vec4( 0.0 );\n\t\t#endif\n\t\treturn PI * envMapColor.rgb * envMapIntensity;\n\t}\n\tfloat getSpecularMIPLevel( const in float blinnShininessExponent, const in int maxMIPLevel ) {\n\t\tfloat maxMIPLevelScalar = float( maxMIPLevel );\n\t\tfloat desiredMIPLevel = maxMIPLevelScalar + 0.79248 - 0.5 * log2( pow2( blinnShininessExponent ) + 1.0 );\n\t\treturn clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );\n\t}\n\tvec3 getLightProbeIndirectRadiance( const in GeometricContext geometry, const in float blinnShininessExponent, const in int maxMIPLevel ) {\n\t\t#ifdef ENVMAP_MODE_REFLECTION\n\t\t\tvec3 reflectVec = reflect( -geometry.viewDir, geometry.normal );\n\t\t#else\n\t\t\tvec3 reflectVec = refract( -geometry.viewDir, geometry.normal, refractionRatio );\n\t\t#endif\n\t\treflectVec = inverseTransformDirection( reflectVec, viewMatrix );\n\t\tfloat specularMIPLevel = getSpecularMIPLevel( blinnShininessExponent, maxMIPLevel );\n\t\t#ifdef ENVMAP_TYPE_CUBE\n\t\t\tvec3 queryReflectVec = vec3( flipEnvMap * reflectVec.x, reflectVec.yz );\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = textureCubeLodEXT( envMap, queryReflectVec, specularMIPLevel );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = textureCube( envMap, queryReflectVec, specularMIPLevel );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#elif defined( ENVMAP_TYPE_CUBE_UV )\n\t\t\tvec3 queryReflectVec = vec3( flipEnvMap * reflectVec.x, reflectVec.yz );\n\t\t\tvec4 envMapColor = textureCubeUV(queryReflectVec, BlinnExponentToGGXRoughness(blinnShininessExponent));\n\t\t#elif defined( ENVMAP_TYPE_EQUIREC )\n\t\t\tvec2 sampleUV;\n\t\t\tsampleUV.y = asin( clamp( reflectVec.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;\n\t\t\tsampleUV.x = atan( reflectVec.z, reflectVec.x ) * RECIPROCAL_PI2 + 0.5;\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = texture2DLodEXT( envMap, sampleUV, specularMIPLevel );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = texture2D( envMap, sampleUV, specularMIPLevel );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#elif defined( ENVMAP_TYPE_SPHERE )\n\t\t\tvec3 reflectView = normalize( ( viewMatrix * vec4( reflectVec, 0.0 ) ).xyz + vec3( 0.0,0.0,1.0 ) );\n\t\t\t#ifdef TEXTURE_LOD_EXT\n\t\t\t\tvec4 envMapColor = texture2DLodEXT( envMap, reflectView.xy * 0.5 + 0.5, specularMIPLevel );\n\t\t\t#else\n\t\t\t\tvec4 envMapColor = texture2D( envMap, reflectView.xy * 0.5 + 0.5, specularMIPLevel );\n\t\t\t#endif\n\t\t\tenvMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;\n\t\t#endif\n\t\treturn envMapColor.rgb * envMapIntensity;\n\t}\n#endif\n'

  var lights_phong_fragment = 'BlinnPhongMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb;\nmaterial.specularColor = specular;\nmaterial.specularShininess = shininess;\nmaterial.specularStrength = specularStrength;\n'

  var lights_phong_pars_fragment = 'varying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\nstruct BlinnPhongMaterial {\n\tvec3\tdiffuseColor;\n\tvec3\tspecularColor;\n\tfloat\tspecularShininess;\n\tfloat\tspecularStrength;\n};\nvoid RE_Direct_BlinnPhong( const in IncidentLight directLight, const in GeometricContext geometry, const in BlinnPhongMaterial material, inout ReflectedLight reflectedLight ) {\n\t#ifdef TOON\n\t\tvec3 irradiance = getGradientIrradiance( geometry.normal, directLight.direction ) * directLight.color;\n\t#else\n\t\tfloat dotNL = saturate( dot( geometry.normal, directLight.direction ) );\n\t\tvec3 irradiance = dotNL * directLight.color;\n\t#endif\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\treflectedLight.directDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n\treflectedLight.directSpecular += irradiance * BRDF_Specular_BlinnPhong( directLight, geometry, material.specularColor, material.specularShininess ) * material.specularStrength;\n}\nvoid RE_IndirectDiffuse_BlinnPhong( const in vec3 irradiance, const in GeometricContext geometry, const in BlinnPhongMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\n#define RE_Direct\t\t\t\tRE_Direct_BlinnPhong\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_BlinnPhong\n#define Material_LightProbeLOD( material )\t(0)\n'

  var lights_physical_fragment = 'PhysicalMaterial material;\nmaterial.diffuseColor = diffuseColor.rgb * ( 1.0 - metalnessFactor );\nmaterial.specularRoughness = clamp( roughnessFactor, 0.04, 1.0 );\n#ifdef STANDARD\n\tmaterial.specularColor = mix( vec3( DEFAULT_SPECULAR_COEFFICIENT ), diffuseColor.rgb, metalnessFactor );\n#else\n\tmaterial.specularColor = mix( vec3( MAXIMUM_SPECULAR_COEFFICIENT * pow2( reflectivity ) ), diffuseColor.rgb, metalnessFactor );\n\tmaterial.clearCoat = saturate( clearCoat );\tmaterial.clearCoatRoughness = clamp( clearCoatRoughness, 0.04, 1.0 );\n#endif\n'

  var lights_physical_pars_fragment = 'struct PhysicalMaterial {\n\tvec3\tdiffuseColor;\n\tfloat\tspecularRoughness;\n\tvec3\tspecularColor;\n\t#ifndef STANDARD\n\t\tfloat clearCoat;\n\t\tfloat clearCoatRoughness;\n\t#endif\n};\n#define MAXIMUM_SPECULAR_COEFFICIENT 0.16\n#define DEFAULT_SPECULAR_COEFFICIENT 0.04\nfloat clearCoatDHRApprox( const in float roughness, const in float dotNL ) {\n\treturn DEFAULT_SPECULAR_COEFFICIENT + ( 1.0 - DEFAULT_SPECULAR_COEFFICIENT ) * ( pow( 1.0 - dotNL, 5.0 ) * pow( 1.0 - roughness, 2.0 ) );\n}\n#if NUM_RECT_AREA_LIGHTS > 0\n\tvoid RE_Direct_RectArea_Physical( const in RectAreaLight rectAreaLight, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\t\tvec3 normal = geometry.normal;\n\t\tvec3 viewDir = geometry.viewDir;\n\t\tvec3 position = geometry.position;\n\t\tvec3 lightPos = rectAreaLight.position;\n\t\tvec3 halfWidth = rectAreaLight.halfWidth;\n\t\tvec3 halfHeight = rectAreaLight.halfHeight;\n\t\tvec3 lightColor = rectAreaLight.color;\n\t\tfloat roughness = material.specularRoughness;\n\t\tvec3 rectCoords[ 4 ];\n\t\trectCoords[ 0 ] = lightPos - halfWidth - halfHeight;\t\trectCoords[ 1 ] = lightPos + halfWidth - halfHeight;\n\t\trectCoords[ 2 ] = lightPos + halfWidth + halfHeight;\n\t\trectCoords[ 3 ] = lightPos - halfWidth + halfHeight;\n\t\tvec2 uv = LTC_Uv( normal, viewDir, roughness );\n\t\tvec4 t1 = texture2D( ltc_1, uv );\n\t\tvec4 t2 = texture2D( ltc_2, uv );\n\t\tmat3 mInv = mat3(\n\t\t\tvec3( t1.x, 0, t1.y ),\n\t\t\tvec3(    0, 1,    0 ),\n\t\t\tvec3( t1.z, 0, t1.w )\n\t\t);\n\t\tvec3 fresnel = ( material.specularColor * t2.x + ( vec3( 1.0 ) - material.specularColor ) * t2.y );\n\t\treflectedLight.directSpecular += lightColor * fresnel * LTC_Evaluate( normal, viewDir, position, mInv, rectCoords );\n\t\treflectedLight.directDiffuse += lightColor * material.diffuseColor * LTC_Evaluate( normal, viewDir, position, mat3( 1.0 ), rectCoords );\n\t}\n#endif\nvoid RE_Direct_Physical( const in IncidentLight directLight, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\tfloat dotNL = saturate( dot( geometry.normal, directLight.direction ) );\n\tvec3 irradiance = dotNL * directLight.color;\n\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\tirradiance *= PI;\n\t#endif\n\t#ifndef STANDARD\n\t\tfloat clearCoatDHR = material.clearCoat * clearCoatDHRApprox( material.clearCoatRoughness, dotNL );\n\t#else\n\t\tfloat clearCoatDHR = 0.0;\n\t#endif\n\treflectedLight.directSpecular += ( 1.0 - clearCoatDHR ) * irradiance * BRDF_Specular_GGX( directLight, geometry, material.specularColor, material.specularRoughness );\n\treflectedLight.directDiffuse += ( 1.0 - clearCoatDHR ) * irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n\t#ifndef STANDARD\n\t\treflectedLight.directSpecular += irradiance * material.clearCoat * BRDF_Specular_GGX( directLight, geometry, vec3( DEFAULT_SPECULAR_COEFFICIENT ), material.clearCoatRoughness );\n\t#endif\n}\nvoid RE_IndirectDiffuse_Physical( const in vec3 irradiance, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\treflectedLight.indirectDiffuse += irradiance * BRDF_Diffuse_Lambert( material.diffuseColor );\n}\nvoid RE_IndirectSpecular_Physical( const in vec3 radiance, const in vec3 clearCoatRadiance, const in GeometricContext geometry, const in PhysicalMaterial material, inout ReflectedLight reflectedLight ) {\n\t#ifndef STANDARD\n\t\tfloat dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );\n\t\tfloat dotNL = dotNV;\n\t\tfloat clearCoatDHR = material.clearCoat * clearCoatDHRApprox( material.clearCoatRoughness, dotNL );\n\t#else\n\t\tfloat clearCoatDHR = 0.0;\n\t#endif\n\treflectedLight.indirectSpecular += ( 1.0 - clearCoatDHR ) * radiance * BRDF_Specular_GGX_Environment( geometry, material.specularColor, material.specularRoughness );\n\t#ifndef STANDARD\n\t\treflectedLight.indirectSpecular += clearCoatRadiance * material.clearCoat * BRDF_Specular_GGX_Environment( geometry, vec3( DEFAULT_SPECULAR_COEFFICIENT ), material.clearCoatRoughness );\n\t#endif\n}\n#define RE_Direct\t\t\t\tRE_Direct_Physical\n#define RE_Direct_RectArea\t\tRE_Direct_RectArea_Physical\n#define RE_IndirectDiffuse\t\tRE_IndirectDiffuse_Physical\n#define RE_IndirectSpecular\t\tRE_IndirectSpecular_Physical\n#define Material_BlinnShininessExponent( material )   GGXRoughnessToBlinnExponent( material.specularRoughness )\n#define Material_ClearCoat_BlinnShininessExponent( material )   GGXRoughnessToBlinnExponent( material.clearCoatRoughness )\nfloat computeSpecularOcclusion( const in float dotNV, const in float ambientOcclusion, const in float roughness ) {\n\treturn saturate( pow( dotNV + ambientOcclusion, exp2( - 16.0 * roughness - 1.0 ) ) - 1.0 + ambientOcclusion );\n}\n'

  var lights_fragment_begin = '\nGeometricContext geometry;\ngeometry.position = - vViewPosition;\ngeometry.normal = normal;\ngeometry.viewDir = normalize( vViewPosition );\nIncidentLight directLight;\n#if ( NUM_POINT_LIGHTS > 0 ) && defined( RE_Direct )\n\tPointLight pointLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tpointLight = pointLights[ i ];\n\t\tgetPointDirectLightIrradiance( pointLight, geometry, directLight );\n\t\t#ifdef USE_SHADOWMAP\n\t\tdirectLight.color *= all( bvec2( pointLight.shadow, directLight.visible ) ) ? getPointShadow( pointShadowMap[ i ], pointLight.shadowMapSize, pointLight.shadowBias, pointLight.shadowRadius, vPointShadowCoord[ i ], pointLight.shadowCameraNear, pointLight.shadowCameraFar ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n#endif\n#if ( NUM_SPOT_LIGHTS > 0 ) && defined( RE_Direct )\n\tSpotLight spotLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tspotLight = spotLights[ i ];\n\t\tgetSpotDirectLightIrradiance( spotLight, geometry, directLight );\n\t\t#ifdef USE_SHADOWMAP\n\t\tdirectLight.color *= all( bvec2( spotLight.shadow, directLight.visible ) ) ? getShadow( spotShadowMap[ i ], spotLight.shadowMapSize, spotLight.shadowBias, spotLight.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n#endif\n#if ( NUM_DIR_LIGHTS > 0 ) && defined( RE_Direct )\n\tDirectionalLight directionalLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tdirectionalLight = directionalLights[ i ];\n\t\tgetDirectionalDirectLightIrradiance( directionalLight, geometry, directLight );\n\t\t#ifdef USE_SHADOWMAP\n\t\tdirectLight.color *= all( bvec2( directionalLight.shadow, directLight.visible ) ) ? getShadow( directionalShadowMap[ i ], directionalLight.shadowMapSize, directionalLight.shadowBias, directionalLight.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;\n\t\t#endif\n\t\tRE_Direct( directLight, geometry, material, reflectedLight );\n\t}\n#endif\n#if ( NUM_RECT_AREA_LIGHTS > 0 ) && defined( RE_Direct_RectArea )\n\tRectAreaLight rectAreaLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_RECT_AREA_LIGHTS; i ++ ) {\n\t\trectAreaLight = rectAreaLights[ i ];\n\t\tRE_Direct_RectArea( rectAreaLight, geometry, material, reflectedLight );\n\t}\n#endif\n#if defined( RE_IndirectDiffuse )\n\tvec3 irradiance = getAmbientLightIrradiance( ambientLightColor );\n\t#if ( NUM_HEMI_LIGHTS > 0 )\n\t\t#pragma unroll_loop\n\t\tfor ( int i = 0; i < NUM_HEMI_LIGHTS; i ++ ) {\n\t\t\tirradiance += getHemisphereLightIrradiance( hemisphereLights[ i ], geometry );\n\t\t}\n\t#endif\n#endif\n#if defined( RE_IndirectSpecular )\n\tvec3 radiance = vec3( 0.0 );\n\tvec3 clearCoatRadiance = vec3( 0.0 );\n#endif\n'

  var lights_fragment_maps = '#if defined( RE_IndirectDiffuse )\n\t#ifdef USE_LIGHTMAP\n\t\tvec3 lightMapIrradiance = texture2D( lightMap, vUv2 ).xyz * lightMapIntensity;\n\t\t#ifndef PHYSICALLY_CORRECT_LIGHTS\n\t\t\tlightMapIrradiance *= PI;\n\t\t#endif\n\t\tirradiance += lightMapIrradiance;\n\t#endif\n\t#if defined( USE_ENVMAP ) && defined( PHYSICAL ) && defined( ENVMAP_TYPE_CUBE_UV )\n\t\tirradiance += getLightProbeIndirectIrradiance( geometry, maxMipLevel );\n\t#endif\n#endif\n#if defined( USE_ENVMAP ) && defined( RE_IndirectSpecular )\n\tradiance += getLightProbeIndirectRadiance( geometry, Material_BlinnShininessExponent( material ), maxMipLevel );\n\t#ifndef STANDARD\n\t\tclearCoatRadiance += getLightProbeIndirectRadiance( geometry, Material_ClearCoat_BlinnShininessExponent( material ), maxMipLevel );\n\t#endif\n#endif\n'

  var lights_fragment_end = '#if defined( RE_IndirectDiffuse )\n\tRE_IndirectDiffuse( irradiance, geometry, material, reflectedLight );\n#endif\n#if defined( RE_IndirectSpecular )\n\tRE_IndirectSpecular( radiance, clearCoatRadiance, geometry, material, reflectedLight );\n#endif\n'

  var logdepthbuf_fragment = '#if defined( USE_LOGDEPTHBUF ) && defined( USE_LOGDEPTHBUF_EXT )\n\tgl_FragDepthEXT = log2( vFragDepth ) * logDepthBufFC * 0.5;\n#endif'

  var logdepthbuf_pars_fragment = '#ifdef USE_LOGDEPTHBUF\n\tuniform float logDepthBufFC;\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvarying float vFragDepth;\n\t#endif\n#endif\n'

  var logdepthbuf_pars_vertex = '#ifdef USE_LOGDEPTHBUF\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvarying float vFragDepth;\n\t#endif\n\tuniform float logDepthBufFC;\n#endif'

  var logdepthbuf_vertex = '#ifdef USE_LOGDEPTHBUF\n\t#ifdef USE_LOGDEPTHBUF_EXT\n\t\tvFragDepth = 1.0 + gl_Position.w;\n\t#else\n\t\tgl_Position.z = log2( max( EPSILON, gl_Position.w + 1.0 ) ) * logDepthBufFC - 1.0;\n\t\tgl_Position.z *= gl_Position.w;\n\t#endif\n#endif\n'

  var map_fragment = '#ifdef USE_MAP\n\tvec4 texelColor = texture2D( map, vUv );\n\ttexelColor = mapTexelToLinear( texelColor );\n\tdiffuseColor *= texelColor;\n#endif\n'

  var map_pars_fragment = '#ifdef USE_MAP\n\tuniform sampler2D map;\n#endif\n'

  var map_particle_fragment = '#ifdef USE_MAP\n\tvec2 uv = ( uvTransform * vec3( gl_PointCoord.x, 1.0 - gl_PointCoord.y, 1 ) ).xy;\n\tvec4 mapTexel = texture2D( map, uv );\n\tdiffuseColor *= mapTexelToLinear( mapTexel );\n#endif\n'

  var map_particle_pars_fragment = '#ifdef USE_MAP\n\tuniform mat3 uvTransform;\n\tuniform sampler2D map;\n#endif\n'

  var metalnessmap_fragment = 'float metalnessFactor = metalness;\n#ifdef USE_METALNESSMAP\n\tvec4 texelMetalness = texture2D( metalnessMap, vUv );\n\tmetalnessFactor *= texelMetalness.b;\n#endif\n'

  var metalnessmap_pars_fragment = '#ifdef USE_METALNESSMAP\n\tuniform sampler2D metalnessMap;\n#endif'

  var morphnormal_vertex = '#ifdef USE_MORPHNORMALS\n\tobjectNormal += ( morphNormal0 - normal ) * morphTargetInfluences[ 0 ];\n\tobjectNormal += ( morphNormal1 - normal ) * morphTargetInfluences[ 1 ];\n\tobjectNormal += ( morphNormal2 - normal ) * morphTargetInfluences[ 2 ];\n\tobjectNormal += ( morphNormal3 - normal ) * morphTargetInfluences[ 3 ];\n#endif\n'

  var morphtarget_pars_vertex = '#ifdef USE_MORPHTARGETS\n\t#ifndef USE_MORPHNORMALS\n\tuniform float morphTargetInfluences[ 8 ];\n\t#else\n\tuniform float morphTargetInfluences[ 4 ];\n\t#endif\n#endif'

  var morphtarget_vertex = '#ifdef USE_MORPHTARGETS\n\ttransformed += ( morphTarget0 - position ) * morphTargetInfluences[ 0 ];\n\ttransformed += ( morphTarget1 - position ) * morphTargetInfluences[ 1 ];\n\ttransformed += ( morphTarget2 - position ) * morphTargetInfluences[ 2 ];\n\ttransformed += ( morphTarget3 - position ) * morphTargetInfluences[ 3 ];\n\t#ifndef USE_MORPHNORMALS\n\ttransformed += ( morphTarget4 - position ) * morphTargetInfluences[ 4 ];\n\ttransformed += ( morphTarget5 - position ) * morphTargetInfluences[ 5 ];\n\ttransformed += ( morphTarget6 - position ) * morphTargetInfluences[ 6 ];\n\ttransformed += ( morphTarget7 - position ) * morphTargetInfluences[ 7 ];\n\t#endif\n#endif\n'

  var normal_fragment_begin = '#ifdef FLAT_SHADED\n\tvec3 fdx = vec3( dFdx( vViewPosition.x ), dFdx( vViewPosition.y ), dFdx( vViewPosition.z ) );\n\tvec3 fdy = vec3( dFdy( vViewPosition.x ), dFdy( vViewPosition.y ), dFdy( vViewPosition.z ) );\n\tvec3 normal = normalize( cross( fdx, fdy ) );\n#else\n\tvec3 normal = normalize( vNormal );\n\t#ifdef DOUBLE_SIDED\n\t\tnormal = normal * ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t#endif\n#endif\n'

  var normal_fragment_maps = '#ifdef USE_NORMALMAP\n\tnormal = perturbNormal2Arb( -vViewPosition, normal );\n#elif defined( USE_BUMPMAP )\n\tnormal = perturbNormalArb( -vViewPosition, normal, dHdxy_fwd() );\n#endif\n'

  var normalmap_pars_fragment = '#ifdef USE_NORMALMAP\n\tuniform sampler2D normalMap;\n\tuniform vec2 normalScale;\n\tvec3 perturbNormal2Arb( vec3 eye_pos, vec3 surf_norm ) {\n\t\tvec3 q0 = vec3( dFdx( eye_pos.x ), dFdx( eye_pos.y ), dFdx( eye_pos.z ) );\n\t\tvec3 q1 = vec3( dFdy( eye_pos.x ), dFdy( eye_pos.y ), dFdy( eye_pos.z ) );\n\t\tvec2 st0 = dFdx( vUv.st );\n\t\tvec2 st1 = dFdy( vUv.st );\n\t\tfloat scale = sign( st1.t * st0.s - st0.t * st1.s );\n\t\tvec3 S = normalize( ( q0 * st1.t - q1 * st0.t ) * scale );\n\t\tvec3 T = normalize( ( - q0 * st1.s + q1 * st0.s ) * scale );\n\t\tvec3 N = normalize( surf_norm );\n\t\tmat3 tsn = mat3( S, T, N );\n\t\tvec3 mapN = texture2D( normalMap, vUv ).xyz * 2.0 - 1.0;\n\t\tmapN.xy *= normalScale;\n\t\tmapN.xy *= ( float( gl_FrontFacing ) * 2.0 - 1.0 );\n\t\treturn normalize( tsn * mapN );\n\t}\n#endif\n'

  var packing = 'vec3 packNormalToRGB( const in vec3 normal ) {\n\treturn normalize( normal ) * 0.5 + 0.5;\n}\nvec3 unpackRGBToNormal( const in vec3 rgb ) {\n\treturn 2.0 * rgb.xyz - 1.0;\n}\nconst float PackUpscale = 256. / 255.;const float UnpackDownscale = 255. / 256.;\nconst vec3 PackFactors = vec3( 256. * 256. * 256., 256. * 256.,  256. );\nconst vec4 UnpackFactors = UnpackDownscale / vec4( PackFactors, 1. );\nconst float ShiftRight8 = 1. / 256.;\nvec4 packDepthToRGBA( const in float v ) {\n\tvec4 r = vec4( fract( v * PackFactors ), v );\n\tr.yzw -= r.xyz * ShiftRight8;\treturn r * PackUpscale;\n}\nfloat unpackRGBAToDepth( const in vec4 v ) {\n\treturn dot( v, UnpackFactors );\n}\nfloat viewZToOrthographicDepth( const in float viewZ, const in float near, const in float far ) {\n\treturn ( viewZ + near ) / ( near - far );\n}\nfloat orthographicDepthToViewZ( const in float linearClipZ, const in float near, const in float far ) {\n\treturn linearClipZ * ( near - far ) - near;\n}\nfloat viewZToPerspectiveDepth( const in float viewZ, const in float near, const in float far ) {\n\treturn (( near + viewZ ) * far ) / (( far - near ) * viewZ );\n}\nfloat perspectiveDepthToViewZ( const in float invClipZ, const in float near, const in float far ) {\n\treturn ( near * far ) / ( ( far - near ) * invClipZ - far );\n}\n'

  var premultiplied_alpha_fragment = '#ifdef PREMULTIPLIED_ALPHA\n\tgl_FragColor.rgb *= gl_FragColor.a;\n#endif\n'

  var project_vertex = 'vec4 mvPosition = modelViewMatrix * vec4( transformed, 1.0 );\ngl_Position = projectionMatrix * mvPosition;\n'

  var dithering_fragment = '#if defined( DITHERING )\n  gl_FragColor.rgb = dithering( gl_FragColor.rgb );\n#endif\n'

  var dithering_pars_fragment = '#if defined( DITHERING )\n\tvec3 dithering( vec3 color ) {\n\t\tfloat grid_position = rand( gl_FragCoord.xy );\n\t\tvec3 dither_shift_RGB = vec3( 0.25 / 255.0, -0.25 / 255.0, 0.25 / 255.0 );\n\t\tdither_shift_RGB = mix( 2.0 * dither_shift_RGB, -2.0 * dither_shift_RGB, grid_position );\n\t\treturn color + dither_shift_RGB;\n\t}\n#endif\n'

  var roughnessmap_fragment = 'float roughnessFactor = roughness;\n#ifdef USE_ROUGHNESSMAP\n\tvec4 texelRoughness = texture2D( roughnessMap, vUv );\n\troughnessFactor *= texelRoughness.g;\n#endif\n'

  var roughnessmap_pars_fragment = '#ifdef USE_ROUGHNESSMAP\n\tuniform sampler2D roughnessMap;\n#endif'

  var shadowmap_pars_fragment = '#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHTS > 0\n\t\tuniform sampler2D directionalShadowMap[ NUM_DIR_LIGHTS ];\n\t\tvarying vec4 vDirectionalShadowCoord[ NUM_DIR_LIGHTS ];\n\t#endif\n\t#if NUM_SPOT_LIGHTS > 0\n\t\tuniform sampler2D spotShadowMap[ NUM_SPOT_LIGHTS ];\n\t\tvarying vec4 vSpotShadowCoord[ NUM_SPOT_LIGHTS ];\n\t#endif\n\t#if NUM_POINT_LIGHTS > 0\n\t\tuniform sampler2D pointShadowMap[ NUM_POINT_LIGHTS ];\n\t\tvarying vec4 vPointShadowCoord[ NUM_POINT_LIGHTS ];\n\t#endif\n\tfloat texture2DCompare( sampler2D depths, vec2 uv, float compare ) {\n\t\treturn step( compare, unpackRGBAToDepth( texture2D( depths, uv ) ) );\n\t}\n\tfloat texture2DShadowLerp( sampler2D depths, vec2 size, vec2 uv, float compare ) {\n\t\tconst vec2 offset = vec2( 0.0, 1.0 );\n\t\tvec2 texelSize = vec2( 1.0 ) / size;\n\t\tvec2 centroidUV = floor( uv * size + 0.5 ) / size;\n\t\tfloat lb = texture2DCompare( depths, centroidUV + texelSize * offset.xx, compare );\n\t\tfloat lt = texture2DCompare( depths, centroidUV + texelSize * offset.xy, compare );\n\t\tfloat rb = texture2DCompare( depths, centroidUV + texelSize * offset.yx, compare );\n\t\tfloat rt = texture2DCompare( depths, centroidUV + texelSize * offset.yy, compare );\n\t\tvec2 f = fract( uv * size + 0.5 );\n\t\tfloat a = mix( lb, lt, f.y );\n\t\tfloat b = mix( rb, rt, f.y );\n\t\tfloat c = mix( a, b, f.x );\n\t\treturn c;\n\t}\n\tfloat getShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord ) {\n\t\tfloat shadow = 1.0;\n\t\tshadowCoord.xyz /= shadowCoord.w;\n\t\tshadowCoord.z += shadowBias;\n\t\tbvec4 inFrustumVec = bvec4 ( shadowCoord.x >= 0.0, shadowCoord.x <= 1.0, shadowCoord.y >= 0.0, shadowCoord.y <= 1.0 );\n\t\tbool inFrustum = all( inFrustumVec );\n\t\tbvec2 frustumTestVec = bvec2( inFrustum, shadowCoord.z <= 1.0 );\n\t\tbool frustumTest = all( frustumTestVec );\n\t\tif ( frustumTest ) {\n\t\t#if defined( SHADOWMAP_TYPE_PCF )\n\t\t\tvec2 texelSize = vec2( 1.0 ) / shadowMapSize;\n\t\t\tfloat dx0 = - texelSize.x * shadowRadius;\n\t\t\tfloat dy0 = - texelSize.y * shadowRadius;\n\t\t\tfloat dx1 = + texelSize.x * shadowRadius;\n\t\t\tfloat dy1 = + texelSize.y * shadowRadius;\n\t\t\tshadow = (\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( 0.0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DCompare( shadowMap, shadowCoord.xy + vec2( dx1, dy1 ), shadowCoord.z )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#elif defined( SHADOWMAP_TYPE_PCF_SOFT )\n\t\t\tvec2 texelSize = vec2( 1.0 ) / shadowMapSize;\n\t\t\tfloat dx0 = - texelSize.x * shadowRadius;\n\t\t\tfloat dy0 = - texelSize.y * shadowRadius;\n\t\t\tfloat dx1 = + texelSize.x * shadowRadius;\n\t\t\tfloat dy1 = + texelSize.y * shadowRadius;\n\t\t\tshadow = (\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( dx0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( 0.0, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( dx1, dy0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( dx0, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy, shadowCoord.z ) +\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( dx1, 0.0 ), shadowCoord.z ) +\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( dx0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( 0.0, dy1 ), shadowCoord.z ) +\n\t\t\t\ttexture2DShadowLerp( shadowMap, shadowMapSize, shadowCoord.xy + vec2( dx1, dy1 ), shadowCoord.z )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#else\n\t\t\tshadow = texture2DCompare( shadowMap, shadowCoord.xy, shadowCoord.z );\n\t\t#endif\n\t\t}\n\t\treturn shadow;\n\t}\n\tvec2 cubeToUV( vec3 v, float texelSizeY ) {\n\t\tvec3 absV = abs( v );\n\t\tfloat scaleToCube = 1.0 / max( absV.x, max( absV.y, absV.z ) );\n\t\tabsV *= scaleToCube;\n\t\tv *= scaleToCube * ( 1.0 - 2.0 * texelSizeY );\n\t\tvec2 planar = v.xy;\n\t\tfloat almostATexel = 1.5 * texelSizeY;\n\t\tfloat almostOne = 1.0 - almostATexel;\n\t\tif ( absV.z >= almostOne ) {\n\t\t\tif ( v.z > 0.0 )\n\t\t\t\tplanar.x = 4.0 - v.x;\n\t\t} else if ( absV.x >= almostOne ) {\n\t\t\tfloat signX = sign( v.x );\n\t\t\tplanar.x = v.z * signX + 2.0 * signX;\n\t\t} else if ( absV.y >= almostOne ) {\n\t\t\tfloat signY = sign( v.y );\n\t\t\tplanar.x = v.x + 2.0 * signY + 2.0;\n\t\t\tplanar.y = v.z * signY - 2.0;\n\t\t}\n\t\treturn vec2( 0.125, 0.25 ) * planar + vec2( 0.375, 0.75 );\n\t}\n\tfloat getPointShadow( sampler2D shadowMap, vec2 shadowMapSize, float shadowBias, float shadowRadius, vec4 shadowCoord, float shadowCameraNear, float shadowCameraFar ) {\n\t\tvec2 texelSize = vec2( 1.0 ) / ( shadowMapSize * vec2( 4.0, 2.0 ) );\n\t\tvec3 lightToPosition = shadowCoord.xyz;\n\t\tfloat dp = ( length( lightToPosition ) - shadowCameraNear ) / ( shadowCameraFar - shadowCameraNear );\t\tdp += shadowBias;\n\t\tvec3 bd3D = normalize( lightToPosition );\n\t\t#if defined( SHADOWMAP_TYPE_PCF ) || defined( SHADOWMAP_TYPE_PCF_SOFT )\n\t\t\tvec2 offset = vec2( - 1, 1 ) * shadowRadius * texelSize.y;\n\t\t\treturn (\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xyx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yyx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxy, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.xxx, texelSize.y ), dp ) +\n\t\t\t\ttexture2DCompare( shadowMap, cubeToUV( bd3D + offset.yxx, texelSize.y ), dp )\n\t\t\t) * ( 1.0 / 9.0 );\n\t\t#else\n\t\t\treturn texture2DCompare( shadowMap, cubeToUV( bd3D, texelSize.y ), dp );\n\t\t#endif\n\t}\n#endif\n'

  var shadowmap_pars_vertex = '#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHTS > 0\n\t\tuniform mat4 directionalShadowMatrix[ NUM_DIR_LIGHTS ];\n\t\tvarying vec4 vDirectionalShadowCoord[ NUM_DIR_LIGHTS ];\n\t#endif\n\t#if NUM_SPOT_LIGHTS > 0\n\t\tuniform mat4 spotShadowMatrix[ NUM_SPOT_LIGHTS ];\n\t\tvarying vec4 vSpotShadowCoord[ NUM_SPOT_LIGHTS ];\n\t#endif\n\t#if NUM_POINT_LIGHTS > 0\n\t\tuniform mat4 pointShadowMatrix[ NUM_POINT_LIGHTS ];\n\t\tvarying vec4 vPointShadowCoord[ NUM_POINT_LIGHTS ];\n\t#endif\n#endif\n'

  var shadowmap_vertex = '#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tvDirectionalShadowCoord[ i ] = directionalShadowMatrix[ i ] * worldPosition;\n\t}\n\t#endif\n\t#if NUM_SPOT_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tvSpotShadowCoord[ i ] = spotShadowMatrix[ i ] * worldPosition;\n\t}\n\t#endif\n\t#if NUM_POINT_LIGHTS > 0\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tvPointShadowCoord[ i ] = pointShadowMatrix[ i ] * worldPosition;\n\t}\n\t#endif\n#endif\n'

  var shadowmask_pars_fragment = 'float getShadowMask() {\n\tfloat shadow = 1.0;\n\t#ifdef USE_SHADOWMAP\n\t#if NUM_DIR_LIGHTS > 0\n\tDirectionalLight directionalLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_DIR_LIGHTS; i ++ ) {\n\t\tdirectionalLight = directionalLights[ i ];\n\t\tshadow *= bool( directionalLight.shadow ) ? getShadow( directionalShadowMap[ i ], directionalLight.shadowMapSize, directionalLight.shadowBias, directionalLight.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;\n\t}\n\t#endif\n\t#if NUM_SPOT_LIGHTS > 0\n\tSpotLight spotLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_SPOT_LIGHTS; i ++ ) {\n\t\tspotLight = spotLights[ i ];\n\t\tshadow *= bool( spotLight.shadow ) ? getShadow( spotShadowMap[ i ], spotLight.shadowMapSize, spotLight.shadowBias, spotLight.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;\n\t}\n\t#endif\n\t#if NUM_POINT_LIGHTS > 0\n\tPointLight pointLight;\n\t#pragma unroll_loop\n\tfor ( int i = 0; i < NUM_POINT_LIGHTS; i ++ ) {\n\t\tpointLight = pointLights[ i ];\n\t\tshadow *= bool( pointLight.shadow ) ? getPointShadow( pointShadowMap[ i ], pointLight.shadowMapSize, pointLight.shadowBias, pointLight.shadowRadius, vPointShadowCoord[ i ], pointLight.shadowCameraNear, pointLight.shadowCameraFar ) : 1.0;\n\t}\n\t#endif\n\t#endif\n\treturn shadow;\n}\n'

  var skinbase_vertex = '#ifdef USE_SKINNING\n\tmat4 boneMatX = getBoneMatrix( skinIndex.x );\n\tmat4 boneMatY = getBoneMatrix( skinIndex.y );\n\tmat4 boneMatZ = getBoneMatrix( skinIndex.z );\n\tmat4 boneMatW = getBoneMatrix( skinIndex.w );\n#endif'

  var skinning_pars_vertex = '#ifdef USE_SKINNING\n\tuniform mat4 bindMatrix;\n\tuniform mat4 bindMatrixInverse;\n\t#ifdef BONE_TEXTURE\n\t\tuniform sampler2D boneTexture;\n\t\tuniform int boneTextureSize;\n\t\tmat4 getBoneMatrix( const in float i ) {\n\t\t\tfloat j = i * 4.0;\n\t\t\tfloat x = mod( j, float( boneTextureSize ) );\n\t\t\tfloat y = floor( j / float( boneTextureSize ) );\n\t\t\tfloat dx = 1.0 / float( boneTextureSize );\n\t\t\tfloat dy = 1.0 / float( boneTextureSize );\n\t\t\ty = dy * ( y + 0.5 );\n\t\t\tvec4 v1 = texture2D( boneTexture, vec2( dx * ( x + 0.5 ), y ) );\n\t\t\tvec4 v2 = texture2D( boneTexture, vec2( dx * ( x + 1.5 ), y ) );\n\t\t\tvec4 v3 = texture2D( boneTexture, vec2( dx * ( x + 2.5 ), y ) );\n\t\t\tvec4 v4 = texture2D( boneTexture, vec2( dx * ( x + 3.5 ), y ) );\n\t\t\tmat4 bone = mat4( v1, v2, v3, v4 );\n\t\t\treturn bone;\n\t\t}\n\t#else\n\t\tuniform mat4 boneMatrices[ MAX_BONES ];\n\t\tmat4 getBoneMatrix( const in float i ) {\n\t\t\tmat4 bone = boneMatrices[ int(i) ];\n\t\t\treturn bone;\n\t\t}\n\t#endif\n#endif\n'

  var skinning_vertex = '#ifdef USE_SKINNING\n\tvec4 skinVertex = bindMatrix * vec4( transformed, 1.0 );\n\tvec4 skinned = vec4( 0.0 );\n\tskinned += boneMatX * skinVertex * skinWeight.x;\n\tskinned += boneMatY * skinVertex * skinWeight.y;\n\tskinned += boneMatZ * skinVertex * skinWeight.z;\n\tskinned += boneMatW * skinVertex * skinWeight.w;\n\ttransformed = ( bindMatrixInverse * skinned ).xyz;\n#endif\n'

  var skinnormal_vertex = '#ifdef USE_SKINNING\n\tmat4 skinMatrix = mat4( 0.0 );\n\tskinMatrix += skinWeight.x * boneMatX;\n\tskinMatrix += skinWeight.y * boneMatY;\n\tskinMatrix += skinWeight.z * boneMatZ;\n\tskinMatrix += skinWeight.w * boneMatW;\n\tskinMatrix  = bindMatrixInverse * skinMatrix * bindMatrix;\n\tobjectNormal = vec4( skinMatrix * vec4( objectNormal, 0.0 ) ).xyz;\n#endif\n'

  var specularmap_fragment = 'float specularStrength;\n#ifdef USE_SPECULARMAP\n\tvec4 texelSpecular = texture2D( specularMap, vUv );\n\tspecularStrength = texelSpecular.r;\n#else\n\tspecularStrength = 1.0;\n#endif'

  var specularmap_pars_fragment = '#ifdef USE_SPECULARMAP\n\tuniform sampler2D specularMap;\n#endif'

  var tonemapping_fragment = '#if defined( TONE_MAPPING )\n  gl_FragColor.rgb = toneMapping( gl_FragColor.rgb );\n#endif\n'

  var tonemapping_pars_fragment = '#ifndef saturate\n\t#define saturate(a) clamp( a, 0.0, 1.0 )\n#endif\nuniform float toneMappingExposure;\nuniform float toneMappingWhitePoint;\nvec3 LinearToneMapping( vec3 color ) {\n\treturn toneMappingExposure * color;\n}\nvec3 ReinhardToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\treturn saturate( color / ( vec3( 1.0 ) + color ) );\n}\n#define Uncharted2Helper( x ) max( ( ( x * ( 0.15 * x + 0.10 * 0.50 ) + 0.20 * 0.02 ) / ( x * ( 0.15 * x + 0.50 ) + 0.20 * 0.30 ) ) - 0.02 / 0.30, vec3( 0.0 ) )\nvec3 Uncharted2ToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\treturn saturate( Uncharted2Helper( color ) / Uncharted2Helper( vec3( toneMappingWhitePoint ) ) );\n}\nvec3 OptimizedCineonToneMapping( vec3 color ) {\n\tcolor *= toneMappingExposure;\n\tcolor = max( vec3( 0.0 ), color - 0.004 );\n\treturn pow( ( color * ( 6.2 * color + 0.5 ) ) / ( color * ( 6.2 * color + 1.7 ) + 0.06 ), vec3( 2.2 ) );\n}\n'

  var uv_pars_fragment = '#if defined( USE_MAP ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( USE_SPECULARMAP ) || defined( USE_ALPHAMAP ) || defined( USE_EMISSIVEMAP ) || defined( USE_ROUGHNESSMAP ) || defined( USE_METALNESSMAP )\n\tvarying vec2 vUv;\n#endif'

  var uv_pars_vertex = '#if defined( USE_MAP ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( USE_SPECULARMAP ) || defined( USE_ALPHAMAP ) || defined( USE_EMISSIVEMAP ) || defined( USE_ROUGHNESSMAP ) || defined( USE_METALNESSMAP )\n\tvarying vec2 vUv;\n\tuniform mat3 uvTransform;\n#endif\n'

  var uv_vertex = '#if defined( USE_MAP ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( USE_SPECULARMAP ) || defined( USE_ALPHAMAP ) || defined( USE_EMISSIVEMAP ) || defined( USE_ROUGHNESSMAP ) || defined( USE_METALNESSMAP )\n\tvUv = ( uvTransform * vec3( uv, 1 ) ).xy;\n#endif'

  var uv2_pars_fragment = '#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tvarying vec2 vUv2;\n#endif'

  var uv2_pars_vertex = '#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tattribute vec2 uv2;\n\tvarying vec2 vUv2;\n#endif'

  var uv2_vertex = '#if defined( USE_LIGHTMAP ) || defined( USE_AOMAP )\n\tvUv2 = uv2;\n#endif'

  var worldpos_vertex = '#if defined( USE_ENVMAP ) || defined( DISTANCE ) || defined ( USE_SHADOWMAP )\n\tvec4 worldPosition = modelMatrix * vec4( transformed, 1.0 );\n#endif\n'

  var cube_frag = 'uniform samplerCube tCube;\nuniform float tFlip;\nuniform float opacity;\nvarying vec3 vWorldPosition;\nvoid main() {\n\tgl_FragColor = textureCube( tCube, vec3( tFlip * vWorldPosition.x, vWorldPosition.yz ) );\n\tgl_FragColor.a *= opacity;\n}\n'

  var cube_vert = 'varying vec3 vWorldPosition;\n#include <common>\nvoid main() {\n\tvWorldPosition = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n\tgl_Position.z = gl_Position.w;\n}\n'

  var depth_frag = '#if DEPTH_PACKING == 3200\n\tuniform float opacity;\n#endif\n#include <common>\n#include <packing>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( 1.0 );\n\t#if DEPTH_PACKING == 3200\n\t\tdiffuseColor.a = opacity;\n\t#endif\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <logdepthbuf_fragment>\n\t#if DEPTH_PACKING == 3200\n\t\tgl_FragColor = vec4( vec3( 1.0 - gl_FragCoord.z ), opacity );\n\t#elif DEPTH_PACKING == 3201\n\t\tgl_FragColor = packDepthToRGBA( gl_FragCoord.z );\n\t#endif\n}\n'

  var depth_vert = '#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_DISPLACEMENTMAP\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n}\n'

  var distanceRGBA_frag = '#define DISTANCE\nuniform vec3 referencePosition;\nuniform float nearDistance;\nuniform float farDistance;\nvarying vec3 vWorldPosition;\n#include <common>\n#include <packing>\n#include <uv_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main () {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( 1.0 );\n\t#include <map_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\tfloat dist = length( vWorldPosition - referencePosition );\n\tdist = ( dist - nearDistance ) / ( farDistance - nearDistance );\n\tdist = saturate( dist );\n\tgl_FragColor = packDepthToRGBA( dist );\n}\n'

  var distanceRGBA_vert = '#define DISTANCE\nvarying vec3 vWorldPosition;\n#include <common>\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_DISPLACEMENTMAP\n\t\t#include <beginnormal_vertex>\n\t\t#include <morphnormal_vertex>\n\t\t#include <skinnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <worldpos_vertex>\n\t#include <clipping_planes_vertex>\n\tvWorldPosition = worldPosition.xyz;\n}\n'

  var equirect_frag = 'uniform sampler2D tEquirect;\nvarying vec3 vWorldPosition;\n#include <common>\nvoid main() {\n\tvec3 direction = normalize( vWorldPosition );\n\tvec2 sampleUV;\n\tsampleUV.y = asin( clamp( direction.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;\n\tsampleUV.x = atan( direction.z, direction.x ) * RECIPROCAL_PI2 + 0.5;\n\tgl_FragColor = texture2D( tEquirect, sampleUV );\n}\n'

  var equirect_vert = 'varying vec3 vWorldPosition;\n#include <common>\nvoid main() {\n\tvWorldPosition = transformDirection( position, modelMatrix );\n\t#include <begin_vertex>\n\t#include <project_vertex>\n}\n'

  var linedashed_frag = 'uniform vec3 diffuse;\nuniform float opacity;\nuniform float dashSize;\nuniform float totalSize;\nvarying float vLineDistance;\n#include <common>\n#include <color_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tif ( mod( vLineDistance, totalSize ) > dashSize ) {\n\t\tdiscard;\n\t}\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <color_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <premultiplied_alpha_fragment>\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n}\n'

  var linedashed_vert = 'uniform float scale;\nattribute float lineDistance;\nvarying float vLineDistance;\n#include <common>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <color_vertex>\n\tvLineDistance = scale * lineDistance;\n\tvec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );\n\tgl_Position = projectionMatrix * mvPosition;\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <fog_vertex>\n}\n'

  var meshbasic_frag = 'uniform vec3 diffuse;\nuniform float opacity;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <envmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <specularmap_fragment>\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\t#ifdef USE_LIGHTMAP\n\t\treflectedLight.indirectDiffuse += texture2D( lightMap, vUv2 ).xyz * lightMapIntensity;\n\t#else\n\t\treflectedLight.indirectDiffuse += vec3( 1.0 );\n\t#endif\n\t#include <aomap_fragment>\n\treflectedLight.indirectDiffuse *= diffuseColor.rgb;\n\tvec3 outgoingLight = reflectedLight.indirectDiffuse;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <premultiplied_alpha_fragment>\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n}\n'

  var meshbasic_vert = '#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <skinbase_vertex>\n\t#ifdef USE_ENVMAP\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <worldpos_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <envmap_vertex>\n\t#include <fog_vertex>\n}\n'

  var meshlambert_frag = 'uniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float opacity;\nvarying vec3 vLightFront;\n#ifdef DOUBLE_SIDED\n\tvarying vec3 vLightBack;\n#endif\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <lights_pars_maps>\n#include <fog_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <shadowmask_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <specularmap_fragment>\n\t#include <emissivemap_fragment>\n\treflectedLight.indirectDiffuse = getAmbientLightIrradiance( ambientLightColor );\n\t#include <lightmap_fragment>\n\treflectedLight.indirectDiffuse *= BRDF_Diffuse_Lambert( diffuseColor.rgb );\n\t#ifdef DOUBLE_SIDED\n\t\treflectedLight.directDiffuse = ( gl_FrontFacing ) ? vLightFront : vLightBack;\n\t#else\n\t\treflectedLight.directDiffuse = vLightFront;\n\t#endif\n\treflectedLight.directDiffuse *= BRDF_Diffuse_Lambert( diffuseColor.rgb ) * getShadowMask();\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + totalEmissiveRadiance;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}\n'

  var meshlambert_vert = '#define LAMBERT\nvarying vec3 vLightFront;\n#ifdef DOUBLE_SIDED\n\tvarying vec3 vLightBack;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <envmap_pars_vertex>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <lights_pars_maps>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <lights_lambert_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}\n'

  var meshphong_frag = '#define PHONG\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform vec3 specular;\nuniform float shininess;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_pars_fragment>\n#include <gradientmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <lights_pars_maps>\n#include <lights_phong_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <specularmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <specularmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_phong_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;\n\t#include <envmap_fragment>\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}\n'

  var meshphong_vert = '#define PHONG\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <envmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <envmap_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}\n'

  var meshphysical_frag = '#define PHYSICAL\nuniform vec3 diffuse;\nuniform vec3 emissive;\nuniform float roughness;\nuniform float metalness;\nuniform float opacity;\n#ifndef STANDARD\n\tuniform float clearCoat;\n\tuniform float clearCoatRoughness;\n#endif\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <packing>\n#include <dithering_pars_fragment>\n#include <color_pars_fragment>\n#include <uv_pars_fragment>\n#include <uv2_pars_fragment>\n#include <map_pars_fragment>\n#include <alphamap_pars_fragment>\n#include <aomap_pars_fragment>\n#include <lightmap_pars_fragment>\n#include <emissivemap_pars_fragment>\n#include <envmap_pars_fragment>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <cube_uv_reflection_fragment>\n#include <lights_pars_begin>\n#include <lights_pars_maps>\n#include <lights_physical_pars_fragment>\n#include <shadowmap_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <roughnessmap_pars_fragment>\n#include <metalnessmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\tReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );\n\tvec3 totalEmissiveRadiance = emissive;\n\t#include <logdepthbuf_fragment>\n\t#include <map_fragment>\n\t#include <color_fragment>\n\t#include <alphamap_fragment>\n\t#include <alphatest_fragment>\n\t#include <roughnessmap_fragment>\n\t#include <metalnessmap_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\t#include <emissivemap_fragment>\n\t#include <lights_physical_fragment>\n\t#include <lights_fragment_begin>\n\t#include <lights_fragment_maps>\n\t#include <lights_fragment_end>\n\t#include <aomap_fragment>\n\tvec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n\t#include <premultiplied_alpha_fragment>\n\t#include <dithering_fragment>\n}\n'

  var meshphysical_vert = '#define PHYSICAL\nvarying vec3 vViewPosition;\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <common>\n#include <uv_pars_vertex>\n#include <uv2_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <shadowmap_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <uv2_vertex>\n\t#include <color_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\tvViewPosition = - mvPosition.xyz;\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}\n'

  var normal_frag = '#define NORMAL\nuniform float opacity;\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP )\n\tvarying vec3 vViewPosition;\n#endif\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <packing>\n#include <uv_pars_fragment>\n#include <bumpmap_pars_fragment>\n#include <normalmap_pars_fragment>\n#include <logdepthbuf_pars_fragment>\nvoid main() {\n\t#include <logdepthbuf_fragment>\n\t#include <normal_fragment_begin>\n\t#include <normal_fragment_maps>\n\tgl_FragColor = vec4( packNormalToRGB( normal ), opacity );\n}\n'

  var normal_vert = '#define NORMAL\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP )\n\tvarying vec3 vViewPosition;\n#endif\n#ifndef FLAT_SHADED\n\tvarying vec3 vNormal;\n#endif\n#include <uv_pars_vertex>\n#include <displacementmap_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <skinning_pars_vertex>\n#include <logdepthbuf_pars_vertex>\nvoid main() {\n\t#include <uv_vertex>\n\t#include <beginnormal_vertex>\n\t#include <morphnormal_vertex>\n\t#include <skinbase_vertex>\n\t#include <skinnormal_vertex>\n\t#include <defaultnormal_vertex>\n#ifndef FLAT_SHADED\n\tvNormal = normalize( transformedNormal );\n#endif\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <skinning_vertex>\n\t#include <displacementmap_vertex>\n\t#include <project_vertex>\n\t#include <logdepthbuf_vertex>\n#if defined( FLAT_SHADED ) || defined( USE_BUMPMAP ) || defined( USE_NORMALMAP )\n\tvViewPosition = - mvPosition.xyz;\n#endif\n}\n'

  var points_frag = 'uniform vec3 diffuse;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <color_pars_fragment>\n#include <map_particle_pars_fragment>\n#include <fog_pars_fragment>\n#include <logdepthbuf_pars_fragment>\n#include <clipping_planes_pars_fragment>\nvoid main() {\n\t#include <clipping_planes_fragment>\n\tvec3 outgoingLight = vec3( 0.0 );\n\tvec4 diffuseColor = vec4( diffuse, opacity );\n\t#include <logdepthbuf_fragment>\n\t#include <map_particle_fragment>\n\t#include <color_fragment>\n\t#include <alphatest_fragment>\n\toutgoingLight = diffuseColor.rgb;\n\tgl_FragColor = vec4( outgoingLight, diffuseColor.a );\n\t#include <premultiplied_alpha_fragment>\n\t#include <tonemapping_fragment>\n\t#include <encodings_fragment>\n\t#include <fog_fragment>\n}\n'

  var points_vert = 'uniform float size;\nuniform float scale;\n#include <common>\n#include <color_pars_vertex>\n#include <fog_pars_vertex>\n#include <morphtarget_pars_vertex>\n#include <logdepthbuf_pars_vertex>\n#include <clipping_planes_pars_vertex>\nvoid main() {\n\t#include <color_vertex>\n\t#include <begin_vertex>\n\t#include <morphtarget_vertex>\n\t#include <project_vertex>\n\t#ifdef USE_SIZEATTENUATION\n\t\tgl_PointSize = size * ( scale / - mvPosition.z );\n\t#else\n\t\tgl_PointSize = size;\n\t#endif\n\t#include <logdepthbuf_vertex>\n\t#include <clipping_planes_vertex>\n\t#include <worldpos_vertex>\n\t#include <fog_vertex>\n}\n'

  var shadow_frag = 'uniform vec3 color;\nuniform float opacity;\n#include <common>\n#include <packing>\n#include <fog_pars_fragment>\n#include <bsdfs>\n#include <lights_pars_begin>\n#include <shadowmap_pars_fragment>\n#include <shadowmask_pars_fragment>\nvoid main() {\n\tgl_FragColor = vec4( color, opacity * ( 1.0 - getShadowMask() ) );\n\t#include <fog_fragment>\n}\n'

  var shadow_vert = '#include <fog_pars_vertex>\n#include <shadowmap_pars_vertex>\nvoid main() {\n\t#include <begin_vertex>\n\t#include <project_vertex>\n\t#include <worldpos_vertex>\n\t#include <shadowmap_vertex>\n\t#include <fog_vertex>\n}\n'

  var ShaderChunk = {
  	alphamap_fragment: alphamap_fragment,
  	alphamap_pars_fragment: alphamap_pars_fragment,
  	alphatest_fragment: alphatest_fragment,
  	aomap_fragment: aomap_fragment,
  	aomap_pars_fragment: aomap_pars_fragment,
  	begin_vertex: begin_vertex,
  	beginnormal_vertex: beginnormal_vertex,
  	bsdfs: bsdfs,
  	bumpmap_pars_fragment: bumpmap_pars_fragment,
  	clipping_planes_fragment: clipping_planes_fragment,
  	clipping_planes_pars_fragment: clipping_planes_pars_fragment,
  	clipping_planes_pars_vertex: clipping_planes_pars_vertex,
  	clipping_planes_vertex: clipping_planes_vertex,
  	color_fragment: color_fragment,
  	color_pars_fragment: color_pars_fragment,
  	color_pars_vertex: color_pars_vertex,
  	color_vertex: color_vertex,
  	common: common,
  	cube_uv_reflection_fragment: cube_uv_reflection_fragment,
  	defaultnormal_vertex: defaultnormal_vertex,
  	displacementmap_pars_vertex: displacementmap_pars_vertex,
  	displacementmap_vertex: displacementmap_vertex,
  	emissivemap_fragment: emissivemap_fragment,
  	emissivemap_pars_fragment: emissivemap_pars_fragment,
  	encodings_fragment: encodings_fragment,
  	encodings_pars_fragment: encodings_pars_fragment,
  	envmap_fragment: envmap_fragment,
  	envmap_pars_fragment: envmap_pars_fragment,
  	envmap_pars_vertex: envmap_pars_vertex,
  	envmap_vertex: envmap_vertex,
  	fog_vertex: fog_vertex,
  	fog_pars_vertex: fog_pars_vertex,
  	fog_fragment: fog_fragment,
  	fog_pars_fragment: fog_pars_fragment,
  	gradientmap_pars_fragment: gradientmap_pars_fragment,
  	lightmap_fragment: lightmap_fragment,
  	lightmap_pars_fragment: lightmap_pars_fragment,
  	lights_lambert_vertex: lights_lambert_vertex,
  	lights_pars_begin: lights_pars_begin,
  	lights_pars_maps: lights_pars_maps,
  	lights_phong_fragment: lights_phong_fragment,
  	lights_phong_pars_fragment: lights_phong_pars_fragment,
  	lights_physical_fragment: lights_physical_fragment,
  	lights_physical_pars_fragment: lights_physical_pars_fragment,
  	lights_fragment_begin: lights_fragment_begin,
  	lights_fragment_maps: lights_fragment_maps,
  	lights_fragment_end: lights_fragment_end,
  	logdepthbuf_fragment: logdepthbuf_fragment,
  	logdepthbuf_pars_fragment: logdepthbuf_pars_fragment,
  	logdepthbuf_pars_vertex: logdepthbuf_pars_vertex,
  	logdepthbuf_vertex: logdepthbuf_vertex,
  	map_fragment: map_fragment,
  	map_pars_fragment: map_pars_fragment,
  	map_particle_fragment: map_particle_fragment,
  	map_particle_pars_fragment: map_particle_pars_fragment,
  	metalnessmap_fragment: metalnessmap_fragment,
  	metalnessmap_pars_fragment: metalnessmap_pars_fragment,
  	morphnormal_vertex: morphnormal_vertex,
  	morphtarget_pars_vertex: morphtarget_pars_vertex,
  	morphtarget_vertex: morphtarget_vertex,
  	normal_fragment_begin: normal_fragment_begin,
  	normal_fragment_maps: normal_fragment_maps,
  	normalmap_pars_fragment: normalmap_pars_fragment,
  	packing: packing,
  	premultiplied_alpha_fragment: premultiplied_alpha_fragment,
  	project_vertex: project_vertex,
  	dithering_fragment: dithering_fragment,
  	dithering_pars_fragment: dithering_pars_fragment,
  	roughnessmap_fragment: roughnessmap_fragment,
  	roughnessmap_pars_fragment: roughnessmap_pars_fragment,
  	shadowmap_pars_fragment: shadowmap_pars_fragment,
  	shadowmap_pars_vertex: shadowmap_pars_vertex,
  	shadowmap_vertex: shadowmap_vertex,
  	shadowmask_pars_fragment: shadowmask_pars_fragment,
  	skinbase_vertex: skinbase_vertex,
  	skinning_pars_vertex: skinning_pars_vertex,
  	skinning_vertex: skinning_vertex,
  	skinnormal_vertex: skinnormal_vertex,
  	specularmap_fragment: specularmap_fragment,
  	specularmap_pars_fragment: specularmap_pars_fragment,
  	tonemapping_fragment: tonemapping_fragment,
  	tonemapping_pars_fragment: tonemapping_pars_fragment,
  	uv_pars_fragment: uv_pars_fragment,
  	uv_pars_vertex: uv_pars_vertex,
  	uv_vertex: uv_vertex,
  	uv2_pars_fragment: uv2_pars_fragment,
  	uv2_pars_vertex: uv2_pars_vertex,
  	uv2_vertex: uv2_vertex,
  	worldpos_vertex: worldpos_vertex,

  	cube_frag: cube_frag,
  	cube_vert: cube_vert,
  	depth_frag: depth_frag,
  	depth_vert: depth_vert,
  	distanceRGBA_frag: distanceRGBA_frag,
  	distanceRGBA_vert: distanceRGBA_vert,
  	equirect_frag: equirect_frag,
  	equirect_vert: equirect_vert,
  	linedashed_frag: linedashed_frag,
  	linedashed_vert: linedashed_vert,
  	meshbasic_frag: meshbasic_frag,
  	meshbasic_vert: meshbasic_vert,
  	meshlambert_frag: meshlambert_frag,
  	meshlambert_vert: meshlambert_vert,
  	meshphong_frag: meshphong_frag,
  	meshphong_vert: meshphong_vert,
  	meshphysical_frag: meshphysical_frag,
  	meshphysical_vert: meshphysical_vert,
  	normal_frag: normal_frag,
  	normal_vert: normal_vert,
  	points_frag: points_frag,
  	points_vert: points_vert,
  	shadow_frag: shadow_frag,
  	shadow_vert: shadow_vert
  }

  /**
   * Uniform Utilities
   */

  var UniformsUtils = {

  	merge: function (uniforms) {
  		var merged = {}

  		for (var u = 0; u < uniforms.length; u++) {
  			var tmp = this.clone(uniforms[u])

  			for (var p in tmp) {
  				merged[p] = tmp[p]
  			}
  		}

  		return merged
  	},

  	clone: function (uniforms_src) {
  		var uniforms_dst = {}

  		for (var u in uniforms_src) {
  			uniforms_dst[u] = {}

  			for (var p in uniforms_src[u]) {
  				var parameter_src = uniforms_src[u][p]

  				if (parameter_src && (parameter_src.isColor ||
  					parameter_src.isMatrix3 || parameter_src.isMatrix4 ||
  					parameter_src.isVector2 || parameter_src.isVector3 || parameter_src.isVector4 ||
  					parameter_src.isTexture)) {
  					uniforms_dst[u][p] = parameter_src.clone()
  				} else if (Array.isArray(parameter_src)) {
  					uniforms_dst[u][p] = parameter_src.slice()
  				} else {
  					uniforms_dst[u][p] = parameter_src
  				}
  			}
  		}

  		return uniforms_dst
  	}

  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  var ColorKeywords = {
    aliceblue: 0xF0F8FF,
    antiquewhite: 0xFAEBD7,
    aqua: 0x00FFFF,
    aquamarine: 0x7FFFD4,
    azure: 0xF0FFFF,
  	beige: 0xF5F5DC,
    bisque: 0xFFE4C4,
    black: 0x000000,
    blanchedalmond: 0xFFEBCD,
    blue: 0x0000FF,
    blueviolet: 0x8A2BE2,
  	brown: 0xA52A2A,
    burlywood: 0xDEB887,
    cadetblue: 0x5F9EA0,
    chartreuse: 0x7FFF00,
    chocolate: 0xD2691E,
    coral: 0xFF7F50,
  	cornflowerblue: 0x6495ED,
    cornsilk: 0xFFF8DC,
    crimson: 0xDC143C,
    cyan: 0x00FFFF,
    darkblue: 0x00008B,
    darkcyan: 0x008B8B,
  	darkgoldenrod: 0xB8860B,
    darkgray: 0xA9A9A9,
    darkgreen: 0x006400,
    darkgrey: 0xA9A9A9,
    darkkhaki: 0xBDB76B,
    darkmagenta: 0x8B008B,
  	darkolivegreen: 0x556B2F,
    darkorange: 0xFF8C00,
    darkorchid: 0x9932CC,
    darkred: 0x8B0000,
    darksalmon: 0xE9967A,
    darkseagreen: 0x8FBC8F,
  	darkslateblue: 0x483D8B,
    darkslategray: 0x2F4F4F,
    darkslategrey: 0x2F4F4F,
    darkturquoise: 0x00CED1,
    darkviolet: 0x9400D3,
  	deeppink: 0xFF1493,
    deepskyblue: 0x00BFFF,
    dimgray: 0x696969,
    dimgrey: 0x696969,
    dodgerblue: 0x1E90FF,
    firebrick: 0xB22222,
  	floralwhite: 0xFFFAF0,
    forestgreen: 0x228B22,
    fuchsia: 0xFF00FF,
    gainsboro: 0xDCDCDC,
    ghostwhite: 0xF8F8FF,
    gold: 0xFFD700,
  	goldenrod: 0xDAA520,
    gray: 0x808080,
    green: 0x008000,
    greenyellow: 0xADFF2F,
    grey: 0x808080,
    honeydew: 0xF0FFF0,
    hotpink: 0xFF69B4,
  	indianred: 0xCD5C5C,
    indigo: 0x4B0082,
    ivory: 0xFFFFF0,
    khaki: 0xF0E68C,
    lavender: 0xE6E6FA,
    lavenderblush: 0xFFF0F5,
    lawngreen: 0x7CFC00,
  	lemonchiffon: 0xFFFACD,
    lightblue: 0xADD8E6,
    lightcoral: 0xF08080,
    lightcyan: 0xE0FFFF,
    lightgoldenrodyellow: 0xFAFAD2,
    lightgray: 0xD3D3D3,
  	lightgreen: 0x90EE90,
    lightgrey: 0xD3D3D3,
    lightpink: 0xFFB6C1,
    lightsalmon: 0xFFA07A,
    lightseagreen: 0x20B2AA,
    lightskyblue: 0x87CEFA,
  	lightslategray: 0x778899,
    lightslategrey: 0x778899,
    lightsteelblue: 0xB0C4DE,
    lightyellow: 0xFFFFE0,
    lime: 0x00FF00,
    limegreen: 0x32CD32,
  	linen: 0xFAF0E6,
    magenta: 0xFF00FF,
    maroon: 0x800000,
    mediumaquamarine: 0x66CDAA,
    mediumblue: 0x0000CD,
    mediumorchid: 0xBA55D3,
  	mediumpurple: 0x9370DB,
    mediumseagreen: 0x3CB371,
    mediumslateblue: 0x7B68EE,
    mediumspringgreen: 0x00FA9A,
    mediumturquoise: 0x48D1CC,
  	mediumvioletred: 0xC71585,
    midnightblue: 0x191970,
    mintcream: 0xF5FFFA,
    mistyrose: 0xFFE4E1,
    moccasin: 0xFFE4B5,
    navajowhite: 0xFFDEAD,
  	navy: 0x000080,
    oldlace: 0xFDF5E6,
    olive: 0x808000,
    olivedrab: 0x6B8E23,
    orange: 0xFFA500,
    orangered: 0xFF4500,
    orchid: 0xDA70D6,
  	palegoldenrod: 0xEEE8AA,
    palegreen: 0x98FB98,
    paleturquoise: 0xAFEEEE,
    palevioletred: 0xDB7093,
    papayawhip: 0xFFEFD5,
    peachpuff: 0xFFDAB9,
  	peru: 0xCD853F,
    pink: 0xFFC0CB,
    plum: 0xDDA0DD,
    powderblue: 0xB0E0E6,
    purple: 0x800080,
    rebeccapurple: 0x663399,
    red: 0xFF0000,
    rosybrown: 0xBC8F8F,
  	royalblue: 0x4169E1,
    saddlebrown: 0x8B4513,
    salmon: 0xFA8072,
    sandybrown: 0xF4A460,
    seagreen: 0x2E8B57,
    seashell: 0xFFF5EE,
  	sienna: 0xA0522D,
    silver: 0xC0C0C0,
    skyblue: 0x87CEEB,
    slateblue: 0x6A5ACD,
    slategray: 0x708090,
    slategrey: 0x708090,
    snow: 0xFFFAFA,
  	springgreen: 0x00FF7F,
    steelblue: 0x4682B4,
    tan: 0xD2B48C,
    teal: 0x008080,
    thistle: 0xD8BFD8,
    tomato: 0xFF6347,
    turquoise: 0x40E0D0,
  	violet: 0xEE82EE,
    wheat: 0xF5DEB3,
    white: 0xFFFFFF,
    whitesmoke: 0xF5F5F5,
    yellow: 0xFFFF00,
    yellowgreen: 0x9ACD32
  }

  function Color (r, g, b) {
  	if (g === undefined && b === undefined) {
  		// r is THREE.Color, hex or string
  		return this.set(r)
  	}

  	return this.setRGB(r, g, b)
  }

  Object.assign(Color.prototype, {

  	isColor: true,

  	r: 1,
    g: 1,
    b: 1,

  	set: function (value) {
  		if (value && value.isColor) {
  			this.copy(value)
  		} else if (typeof value === 'number') {
  			this.setHex(value)
  		} else if (typeof value === 'string') {
  			this.setStyle(value)
  		}

  		return this
  	},

  	setScalar: function (scalar) {
  		this.r = scalar
  		this.g = scalar
  		this.b = scalar

  		return this
  	},

  	setHex: function (hex) {
  		hex = Math.floor(hex)

  		this.r = (hex >> 16 & 255) / 255
  		this.g = (hex >> 8 & 255) / 255
  		this.b = (hex & 255) / 255

  		return this
  	},

  	setRGB: function (r, g, b) {
  		this.r = r
  		this.g = g
  		this.b = b

  		return this
  	},

  	setHSL: (function () {
  		function hue2rgb (p, q, t) {
  			if (t < 0) t += 1
  			if (t > 1) t -= 1
  			if (t < 1 / 6) return p + (q - p) * 6 * t
  			if (t < 1 / 2) return q
  			if (t < 2 / 3) return p + (q - p) * 6 * (2 / 3 - t)
  			return p
  		}

  		return function setHSL (h, s, l) {
  			// h,s,l ranges are in 0.0 - 1.0
  			h = _Math.euclideanModulo(h, 1)
  			s = _Math.clamp(s, 0, 1)
  			l = _Math.clamp(l, 0, 1)

  			if (s === 0) {
  				this.r = this.g = this.b = l
  			} else {
  				var p = l <= 0.5 ? l * (1 + s) : l + s - (l * s)
  				var q = (2 * l) - p

  				this.r = hue2rgb(q, p, h + 1 / 3)
  				this.g = hue2rgb(q, p, h)
  				this.b = hue2rgb(q, p, h - 1 / 3)
  			}

  			return this
  		}
  	}()),

  	setStyle: function (style) {
  		function handleAlpha (string) {
  			if (string === undefined) return

  			if (parseFloat(string) < 1) {
  				console.warn('THREE.Color: Alpha component of ' + style + ' will be ignored.')
  			}
  		}

  		var m

  		if (m = /^((?:rgb|hsl)a?)\(\s*([^\)]*)\)/.exec(style)) {
  			// rgb / hsl

  			var color
  			var name = m[1]
  			var components = m[2]

  			switch (name) {
  				case 'rgb':
  				case 'rgba':

  					if (color = /^(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec(components)) {
  						// rgb(255,0,0) rgba(255,0,0,0.5)
  						this.r = Math.min(255, parseInt(color[1], 10)) / 255
  						this.g = Math.min(255, parseInt(color[2], 10)) / 255
  						this.b = Math.min(255, parseInt(color[3], 10)) / 255

  						handleAlpha(color[5])

  						return this
  					}

  					if (color = /^(\d+)\%\s*,\s*(\d+)\%\s*,\s*(\d+)\%\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec(components)) {
  						// rgb(100%,0%,0%) rgba(100%,0%,0%,0.5)
  						this.r = Math.min(100, parseInt(color[1], 10)) / 100
  						this.g = Math.min(100, parseInt(color[2], 10)) / 100
  						this.b = Math.min(100, parseInt(color[3], 10)) / 100

  						handleAlpha(color[5])

  						return this
  					}

  					break

  				case 'hsl':
  				case 'hsla':

  					if (color = /^([0-9]*\.?[0-9]+)\s*,\s*(\d+)\%\s*,\s*(\d+)\%\s*(,\s*([0-9]*\.?[0-9]+)\s*)?$/.exec(components)) {
  						// hsl(120,50%,50%) hsla(120,50%,50%,0.5)
  						var h = parseFloat(color[1]) / 360
  						var s = parseInt(color[2], 10) / 100
  						var l = parseInt(color[3], 10) / 100

  						handleAlpha(color[5])

  						return this.setHSL(h, s, l)
  					}

  					break
  			}
  		} else if (m = /^\#([A-Fa-f0-9]+)$/.exec(style)) {
  			// hex color

  			var hex = m[1]
  			var size = hex.length

  			if (size === 3) {
  				// #ff0
  				this.r = parseInt(hex.charAt(0) + hex.charAt(0), 16) / 255
  				this.g = parseInt(hex.charAt(1) + hex.charAt(1), 16) / 255
  				this.b = parseInt(hex.charAt(2) + hex.charAt(2), 16) / 255

  				return this
  			} else if (size === 6) {
  				// #ff0000
  				this.r = parseInt(hex.charAt(0) + hex.charAt(1), 16) / 255
  				this.g = parseInt(hex.charAt(2) + hex.charAt(3), 16) / 255
  				this.b = parseInt(hex.charAt(4) + hex.charAt(5), 16) / 255

  				return this
  			}
  		}

  		if (style && style.length > 0) {
  			// color keywords
  			var hex = ColorKeywords[style]

  			if (hex !== undefined) {
  				// red
  				this.setHex(hex)
  			} else {
  				// unknown color
  				console.warn('THREE.Color: Unknown color ' + style)
  			}
  		}

  		return this
  	},

  	clone: function () {
  		return new this.constructor(this.r, this.g, this.b)
  	},

  	copy: function (color) {
  		this.r = color.r
  		this.g = color.g
  		this.b = color.b

  		return this
  	},

  	copyGammaToLinear: function (color, gammaFactor) {
  		if (gammaFactor === undefined) gammaFactor = 2.0

  		this.r = Math.pow(color.r, gammaFactor)
  		this.g = Math.pow(color.g, gammaFactor)
  		this.b = Math.pow(color.b, gammaFactor)

  		return this
  	},

  	copyLinearToGamma: function (color, gammaFactor) {
  		if (gammaFactor === undefined) gammaFactor = 2.0

  		var safeInverse = (gammaFactor > 0) ? (1.0 / gammaFactor) : 1.0

  		this.r = Math.pow(color.r, safeInverse)
  		this.g = Math.pow(color.g, safeInverse)
  		this.b = Math.pow(color.b, safeInverse)

  		return this
  	},

  	convertGammaToLinear: function (gammaFactor) {
  		this.copyGammaToLinear(this, gammaFactor)

  		return this
  	},

  	convertLinearToGamma: function (gammaFactor) {
  		this.copyLinearToGamma(this, gammaFactor)

  		return this
  	},

  	getHex: function () {
  		return (this.r * 255) << 16 ^ (this.g * 255) << 8 ^ (this.b * 255) << 0
  	},

  	getHexString: function () {
  		return ('000000' + this.getHex().toString(16)).slice(-6)
  	},

  	getHSL: function (target) {
  		// h,s,l ranges are in 0.0 - 1.0

  		if (target === undefined) {
  			console.warn('THREE.Color: .getHSL() target is now required')
  			target = { h: 0, s: 0, l: 0 }
  		}

  		var r = this.r; var g = this.g; var b = this.b

  		var max = Math.max(r, g, b)
  		var min = Math.min(r, g, b)

  		var hue, saturation
  		var lightness = (min + max) / 2.0

  		if (min === max) {
  			hue = 0
  			saturation = 0
  		} else {
  			var delta = max - min

  			saturation = lightness <= 0.5 ? delta / (max + min) : delta / (2 - max - min)

  			switch (max) {
  				case r: hue = (g - b) / delta + (g < b ? 6 : 0); break
  				case g: hue = (b - r) / delta + 2; break
  				case b: hue = (r - g) / delta + 4; break
  			}

  			hue /= 6
  		}

  		target.h = hue
  		target.s = saturation
  		target.l = lightness

  		return target
  	},

  	getStyle: function () {
  		return 'rgb(' + ((this.r * 255) | 0) + ',' + ((this.g * 255) | 0) + ',' + ((this.b * 255) | 0) + ')'
  	},

  	offsetHSL: (function () {
  		var hsl = {}

  		return function (h, s, l) {
  			this.getHSL(hsl)

  			hsl.h += h; hsl.s += s; hsl.l += l

  			this.setHSL(hsl.h, hsl.s, hsl.l)

  			return this
  		}
  	}()),

  	add: function (color) {
  		this.r += color.r
  		this.g += color.g
  		this.b += color.b

  		return this
  	},

  	addColors: function (color1, color2) {
  		this.r = color1.r + color2.r
  		this.g = color1.g + color2.g
  		this.b = color1.b + color2.b

  		return this
  	},

  	addScalar: function (s) {
  		this.r += s
  		this.g += s
  		this.b += s

  		return this
  	},

  	sub: function (color) {
  		this.r = Math.max(0, this.r - color.r)
  		this.g = Math.max(0, this.g - color.g)
  		this.b = Math.max(0, this.b - color.b)

  		return this
  	},

  	multiply: function (color) {
  		this.r *= color.r
  		this.g *= color.g
  		this.b *= color.b

  		return this
  	},

  	multiplyScalar: function (s) {
  		this.r *= s
  		this.g *= s
  		this.b *= s

  		return this
  	},

  	lerp: function (color, alpha) {
  		this.r += (color.r - this.r) * alpha
  		this.g += (color.g - this.g) * alpha
  		this.b += (color.b - this.b) * alpha

  		return this
  	},

  	equals: function (c) {
  		return (c.r === this.r) && (c.g === this.g) && (c.b === this.b)
  	},

  	fromArray: function (array, offset) {
  		if (offset === undefined) offset = 0

  		this.r = array[offset]
  		this.g = array[offset + 1]
  		this.b = array[offset + 2]

  		return this
  	},

  	toArray: function (array, offset) {
  		if (array === undefined) array = []
  		if (offset === undefined) offset = 0

  		array[offset] = this.r
  		array[offset + 1] = this.g
  		array[offset + 2] = this.b

  		return array
  	},

  	toJSON: function () {
  		return this.getHex()
  	}

  })

  /**
   * Uniforms library for shared webgl shaders
   */

  var UniformsLib = {

  	common: {

  		diffuse: { value: new Color(0xeeeeee) },
  		opacity: { value: 1.0 },

  		map: { value: null },
  		uvTransform: { value: new Matrix3() },

  		alphaMap: { value: null }

  	},

  	specularmap: {

  		specularMap: { value: null }

  	},

  	envmap: {

  		envMap: { value: null },
  		flipEnvMap: { value: -1 },
  		reflectivity: { value: 1.0 },
  		refractionRatio: { value: 0.98 },
  		maxMipLevel: { value: 0 }

  	},

  	aomap: {

  		aoMap: { value: null },
  		aoMapIntensity: { value: 1 }

  	},

  	lightmap: {

  		lightMap: { value: null },
  		lightMapIntensity: { value: 1 }

  	},

  	emissivemap: {

  		emissiveMap: { value: null }

  	},

  	bumpmap: {

  		bumpMap: { value: null },
  		bumpScale: { value: 1 }

  	},

  	normalmap: {

  		normalMap: { value: null },
  		normalScale: { value: new Vector2(1, 1) }

  	},

  	displacementmap: {

  		displacementMap: { value: null },
  		displacementScale: { value: 1 },
  		displacementBias: { value: 0 }

  	},

  	roughnessmap: {

  		roughnessMap: { value: null }

  	},

  	metalnessmap: {

  		metalnessMap: { value: null }

  	},

  	gradientmap: {

  		gradientMap: { value: null }

  	},

  	fog: {

  		fogDensity: { value: 0.00025 },
  		fogNear: { value: 1 },
  		fogFar: { value: 2000 },
  		fogColor: { value: new Color(0xffffff) }

  	},

  	lights: {

  		ambientLightColor: { value: [] },

  		directionalLights: {
        value: [],
        properties: {
  			direction: {},
  			color: {},

  			shadow: {},
  			shadowBias: {},
  			shadowRadius: {},
  			shadowMapSize: {}
  		}
      },

  		directionalShadowMap: { value: [] },
  		directionalShadowMatrix: { value: [] },

  		spotLights: {
        value: [],
        properties: {
  			color: {},
  			position: {},
  			direction: {},
  			distance: {},
  			coneCos: {},
  			penumbraCos: {},
  			decay: {},

  			shadow: {},
  			shadowBias: {},
  			shadowRadius: {},
  			shadowMapSize: {}
  		}
      },

  		spotShadowMap: { value: [] },
  		spotShadowMatrix: { value: [] },

  		pointLights: {
        value: [],
        properties: {
  			color: {},
  			position: {},
  			decay: {},
  			distance: {},

  			shadow: {},
  			shadowBias: {},
  			shadowRadius: {},
  			shadowMapSize: {},
  			shadowCameraNear: {},
  			shadowCameraFar: {}
  		}
      },

  		pointShadowMap: { value: [] },
  		pointShadowMatrix: { value: [] },

  		hemisphereLights: {
        value: [],
        properties: {
  			direction: {},
  			skyColor: {},
  			groundColor: {}
  		}
      },

  		// TODO (abelnation): RectAreaLight BRDF data needs to be moved from example to main src
  		rectAreaLights: {
        value: [],
        properties: {
  			color: {},
  			position: {},
  			width: {},
  			height: {}
  		}
      }

  	},

  	points: {

  		diffuse: { value: new Color(0xeeeeee) },
  		opacity: { value: 1.0 },
  		size: { value: 1.0 },
  		scale: { value: 1.0 },
  		map: { value: null },
  		uvTransform: { value: new Matrix3() }

  	}

  }

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   * @author mikael emtinger / http://gomo.se/
   */

  var ShaderLib = {

  	basic: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.common,
  			UniformsLib.specularmap,
  			UniformsLib.envmap,
  			UniformsLib.aomap,
  			UniformsLib.lightmap,
  			UniformsLib.fog
  		]),

  		vertexShader: ShaderChunk.meshbasic_vert,
  		fragmentShader: ShaderChunk.meshbasic_frag

  	},

  	lambert: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.common,
  			UniformsLib.specularmap,
  			UniformsLib.envmap,
  			UniformsLib.aomap,
  			UniformsLib.lightmap,
  			UniformsLib.emissivemap,
  			UniformsLib.fog,
  			UniformsLib.lights,
  			{
  				emissive: { value: new Color(0x000000) }
  			}
  		]),

  		vertexShader: ShaderChunk.meshlambert_vert,
  		fragmentShader: ShaderChunk.meshlambert_frag

  	},

  	phong: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.common,
  			UniformsLib.specularmap,
  			UniformsLib.envmap,
  			UniformsLib.aomap,
  			UniformsLib.lightmap,
  			UniformsLib.emissivemap,
  			UniformsLib.bumpmap,
  			UniformsLib.normalmap,
  			UniformsLib.displacementmap,
  			UniformsLib.gradientmap,
  			UniformsLib.fog,
  			UniformsLib.lights,
  			{
  				emissive: { value: new Color(0x000000) },
  				specular: { value: new Color(0x111111) },
  				shininess: { value: 30 }
  			}
  		]),

  		vertexShader: ShaderChunk.meshphong_vert,
  		fragmentShader: ShaderChunk.meshphong_frag

  	},

  	standard: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.common,
  			UniformsLib.envmap,
  			UniformsLib.aomap,
  			UniformsLib.lightmap,
  			UniformsLib.emissivemap,
  			UniformsLib.bumpmap,
  			UniformsLib.normalmap,
  			UniformsLib.displacementmap,
  			UniformsLib.roughnessmap,
  			UniformsLib.metalnessmap,
  			UniformsLib.fog,
  			UniformsLib.lights,
  			{
  				emissive: { value: new Color(0x000000) },
  				roughness: { value: 0.5 },
  				metalness: { value: 0.5 },
  				envMapIntensity: { value: 1 } // temporary
  			}
  		]),

  		vertexShader: ShaderChunk.meshphysical_vert,
  		fragmentShader: ShaderChunk.meshphysical_frag

  	},

  	points: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.points,
  			UniformsLib.fog
  		]),

  		vertexShader: ShaderChunk.points_vert,
  		fragmentShader: ShaderChunk.points_frag

  	},

  	dashed: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.common,
  			UniformsLib.fog,
  			{
  				scale: { value: 1 },
  				dashSize: { value: 1 },
  				totalSize: { value: 2 }
  			}
  		]),

  		vertexShader: ShaderChunk.linedashed_vert,
  		fragmentShader: ShaderChunk.linedashed_frag

  	},

  	depth: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.common,
  			UniformsLib.displacementmap
  		]),

  		vertexShader: ShaderChunk.depth_vert,
  		fragmentShader: ShaderChunk.depth_frag

  	},

  	normal: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.common,
  			UniformsLib.bumpmap,
  			UniformsLib.normalmap,
  			UniformsLib.displacementmap,
  			{
  				opacity: { value: 1.0 }
  			}
  		]),

  		vertexShader: ShaderChunk.normal_vert,
  		fragmentShader: ShaderChunk.normal_frag

  	},

  	/* -------------------------------------------------------------------------
  	//	Cube map shader
  	 ------------------------------------------------------------------------- */

  	cube: {

  		uniforms: {
  			tCube: { value: null },
  			tFlip: { value: -1 },
  			opacity: { value: 1.0 }
  		},

  		vertexShader: ShaderChunk.cube_vert,
  		fragmentShader: ShaderChunk.cube_frag

  	},

  	equirect: {

  		uniforms: {
  			tEquirect: { value: null }
  		},

  		vertexShader: ShaderChunk.equirect_vert,
  		fragmentShader: ShaderChunk.equirect_frag

  	},

  	distanceRGBA: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.common,
  			UniformsLib.displacementmap,
  			{
  				referencePosition: { value: new Vector3() },
  				nearDistance: { value: 1 },
  				farDistance: { value: 1000 }
  			}
  		]),

  		vertexShader: ShaderChunk.distanceRGBA_vert,
  		fragmentShader: ShaderChunk.distanceRGBA_frag

  	},

  	shadow: {

  		uniforms: UniformsUtils.merge([
  			UniformsLib.lights,
  			UniformsLib.fog,
  			{
  				color: { value: new Color(0x00000) },
  				opacity: { value: 1.0 }
  			}
  		]),

  		vertexShader: ShaderChunk.shadow_vert,
  		fragmentShader: ShaderChunk.shadow_frag

  	}

  }

  ShaderLib.physical = {

  	uniforms: UniformsUtils.merge([
  		ShaderLib.standard.uniforms,
  		{
  			clearCoat: { value: 0 },
  			clearCoatRoughness: { value: 0 }
  		}
  	]),

  	vertexShader: ShaderChunk.meshphysical_vert,
  	fragmentShader: ShaderChunk.meshphysical_frag

  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLAnimation () {
  	var context = null
  	var isAnimating = false
  	var animationLoop = null

  	function onAnimationFrame (time, frame) {
  		if (isAnimating === false) return

  		animationLoop(time, frame)

  		context.requestAnimationFrame(onAnimationFrame)
  	}

  	return {

  		start: function () {
  			if (isAnimating === true) return
  			if (animationLoop === null) return

  			context.requestAnimationFrame(onAnimationFrame)

  			isAnimating = true
  		},

  		stop: function () {
  			isAnimating = false
  		},

  		setAnimationLoop: function (callback) {
  			animationLoop = callback
  		},

  		setContext: function (value) {
  			context = value
  		}

  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLAttributes (gl) {
  	var buffers = new WeakMap()

  	function createBuffer (attribute, bufferType) {
  		var array = attribute.array
  		var usage = attribute.dynamic ? gl.DYNAMIC_DRAW : gl.STATIC_DRAW

  		var buffer = gl.createBuffer()

  		gl.bindBuffer(bufferType, buffer)
  		gl.bufferData(bufferType, array, usage)

  		attribute.onUploadCallback()

  		var type = gl.FLOAT

  		if (array instanceof Float32Array) {
  			type = gl.FLOAT
  		} else if (array instanceof Float64Array) {
  			console.warn('THREE.WebGLAttributes: Unsupported data buffer format: Float64Array.')
  		} else if (array instanceof Uint16Array) {
  			type = gl.UNSIGNED_SHORT
  		} else if (array instanceof Int16Array) {
  			type = gl.SHORT
  		} else if (array instanceof Uint32Array) {
  			type = gl.UNSIGNED_INT
  		} else if (array instanceof Int32Array) {
  			type = gl.INT
  		} else if (array instanceof Int8Array) {
  			type = gl.BYTE
  		} else if (array instanceof Uint8Array) {
  			type = gl.UNSIGNED_BYTE
  		}

  		return {
  			buffer: buffer,
  			type: type,
  			bytesPerElement: array.BYTES_PER_ELEMENT,
  			version: attribute.version
  		}
  	}

  	function updateBuffer (buffer, attribute, bufferType) {
  		var array = attribute.array
  		var updateRange = attribute.updateRange

  		gl.bindBuffer(bufferType, buffer)

  		if (attribute.dynamic === false) {
  			gl.bufferData(bufferType, array, gl.STATIC_DRAW)
  		} else if (updateRange.count === -1) {
  			// Not using update ranges

  			gl.bufferSubData(bufferType, 0, array)
  		} else if (updateRange.count === 0) {
  			console.error('THREE.WebGLObjects.updateBuffer: dynamic THREE.BufferAttribute marked as needsUpdate but updateRange.count is 0, ensure you are using set methods or updating manually.')
  		} else {
  			gl.bufferSubData(bufferType, updateRange.offset * array.BYTES_PER_ELEMENT,
  				array.subarray(updateRange.offset, updateRange.offset + updateRange.count))

  			updateRange.count = -1 // reset range
  		}
  	}

  	//

  	function get (attribute) {
  		if (attribute.isInterleavedBufferAttribute) attribute = attribute.data

  		return buffers.get(attribute)
  	}

  	function remove (attribute) {
  		if (attribute.isInterleavedBufferAttribute) attribute = attribute.data

  		var data = buffers.get(attribute)

  		if (data) {
  			gl.deleteBuffer(data.buffer)

  			buffers.delete(attribute)
  		}
  	}

  	function update (attribute, bufferType) {
  		if (attribute.isInterleavedBufferAttribute) attribute = attribute.data

  		var data = buffers.get(attribute)

  		if (data === undefined) {
  			buffers.set(attribute, createBuffer(attribute, bufferType))
  		} else if (data.version < attribute.version) {
  			updateBuffer(data.buffer, attribute, bufferType)

  			data.version = attribute.version
  		}
  	}

  	return {

  		get: get,
  		remove: remove,
  		update: update

  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author WestLangley / http://github.com/WestLangley
   * @author bhouston / http://clara.io
   */

  function Euler (x, y, z, order) {
  	this._x = x || 0
  	this._y = y || 0
  	this._z = z || 0
  	this._order = order || Euler.DefaultOrder
  }

  Euler.RotationOrders = ['XYZ', 'YZX', 'ZXY', 'XZY', 'YXZ', 'ZYX']

  Euler.DefaultOrder = 'XYZ'

  Object.defineProperties(Euler.prototype, {

  	x: {

  		get: function () {
  			return this._x
  		},

  		set: function (value) {
  			this._x = value
  			this.onChangeCallback()
  		}

  	},

  	y: {

  		get: function () {
  			return this._y
  		},

  		set: function (value) {
  			this._y = value
  			this.onChangeCallback()
  		}

  	},

  	z: {

  		get: function () {
  			return this._z
  		},

  		set: function (value) {
  			this._z = value
  			this.onChangeCallback()
  		}

  	},

  	order: {

  		get: function () {
  			return this._order
  		},

  		set: function (value) {
  			this._order = value
  			this.onChangeCallback()
  		}

  	}

  })

  Object.assign(Euler.prototype, {

  	isEuler: true,

  	set: function (x, y, z, order) {
  		this._x = x
  		this._y = y
  		this._z = z
  		this._order = order || this._order

  		this.onChangeCallback()

  		return this
  	},

  	clone: function () {
  		return new this.constructor(this._x, this._y, this._z, this._order)
  	},

  	copy: function (euler) {
  		this._x = euler._x
  		this._y = euler._y
  		this._z = euler._z
  		this._order = euler._order

  		this.onChangeCallback()

  		return this
  	},

  	setFromRotationMatrix: function (m, order, update) {
  		var clamp = _Math.clamp

  		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

  		var te = m.elements
  		var m11 = te[0]; var m12 = te[4]; var m13 = te[8]
  		var m21 = te[1]; var m22 = te[5]; var m23 = te[9]
  		var m31 = te[2]; var m32 = te[6]; var m33 = te[10]

  		order = order || this._order

  		if (order === 'XYZ') {
  			this._y = Math.asin(clamp(m13, -1, 1))

  			if (Math.abs(m13) < 0.99999) {
  				this._x = Math.atan2(-m23, m33)
  				this._z = Math.atan2(-m12, m11)
  			} else {
  				this._x = Math.atan2(m32, m22)
  				this._z = 0
  			}
  		} else if (order === 'YXZ') {
  			this._x = Math.asin(-clamp(m23, -1, 1))

  			if (Math.abs(m23) < 0.99999) {
  				this._y = Math.atan2(m13, m33)
  				this._z = Math.atan2(m21, m22)
  			} else {
  				this._y = Math.atan2(-m31, m11)
  				this._z = 0
  			}
  		} else if (order === 'ZXY') {
  			this._x = Math.asin(clamp(m32, -1, 1))

  			if (Math.abs(m32) < 0.99999) {
  				this._y = Math.atan2(-m31, m33)
  				this._z = Math.atan2(-m12, m22)
  			} else {
  				this._y = 0
  				this._z = Math.atan2(m21, m11)
  			}
  		} else if (order === 'ZYX') {
  			this._y = Math.asin(-clamp(m31, -1, 1))

  			if (Math.abs(m31) < 0.99999) {
  				this._x = Math.atan2(m32, m33)
  				this._z = Math.atan2(m21, m11)
  			} else {
  				this._x = 0
  				this._z = Math.atan2(-m12, m22)
  			}
  		} else if (order === 'YZX') {
  			this._z = Math.asin(clamp(m21, -1, 1))

  			if (Math.abs(m21) < 0.99999) {
  				this._x = Math.atan2(-m23, m22)
  				this._y = Math.atan2(-m31, m11)
  			} else {
  				this._x = 0
  				this._y = Math.atan2(m13, m33)
  			}
  		} else if (order === 'XZY') {
  			this._z = Math.asin(-clamp(m12, -1, 1))

  			if (Math.abs(m12) < 0.99999) {
  				this._x = Math.atan2(m32, m22)
  				this._y = Math.atan2(m13, m11)
  			} else {
  				this._x = Math.atan2(-m23, m33)
  				this._y = 0
  			}
  		} else {
  			console.warn('THREE.Euler: .setFromRotationMatrix() given unsupported order: ' + order)
  		}

  		this._order = order

  		if (update !== false) this.onChangeCallback()

  		return this
  	},

  	setFromQuaternion: (function () {
  		var matrix = new Matrix4()

  		return function setFromQuaternion (q, order, update) {
  			matrix.makeRotationFromQuaternion(q)

  			return this.setFromRotationMatrix(matrix, order, update)
  		}
  	}()),

  	setFromVector3: function (v, order) {
  		return this.set(v.x, v.y, v.z, order || this._order)
  	},

  	reorder: (function () {
  		// WARNING: this discards revolution information -bhouston

  		var q = new Quaternion()

  		return function reorder (newOrder) {
  			q.setFromEuler(this)

  			return this.setFromQuaternion(q, newOrder)
  		}
  	}()),

  	equals: function (euler) {
  		return (euler._x === this._x) && (euler._y === this._y) && (euler._z === this._z) && (euler._order === this._order)
  	},

  	fromArray: function (array) {
  		this._x = array[0]
  		this._y = array[1]
  		this._z = array[2]
  		if (array[3] !== undefined) this._order = array[3]

  		this.onChangeCallback()

  		return this
  	},

  	toArray: function (array, offset) {
  		if (array === undefined) array = []
  		if (offset === undefined) offset = 0

  		array[offset] = this._x
  		array[offset + 1] = this._y
  		array[offset + 2] = this._z
  		array[offset + 3] = this._order

  		return array
  	},

  	toVector3: function (optionalResult) {
  		if (optionalResult) {
  			return optionalResult.set(this._x, this._y, this._z)
  		} else {
  			return new Vector3(this._x, this._y, this._z)
  		}
  	},

  	onChange: function (callback) {
  		this.onChangeCallback = callback

  		return this
  	},

  	onChangeCallback: function () {}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function Layers () {
  	this.mask = 1 | 0
  }

  Object.assign(Layers.prototype, {

  	set: function (channel) {
  		this.mask = 1 << channel | 0
  	},

  	enable: function (channel) {
  		this.mask |= 1 << channel | 0
  	},

  	toggle: function (channel) {
  		this.mask ^= 1 << channel | 0
  	},

  	disable: function (channel) {
  		this.mask &= ~(1 << channel | 0)
  	},

  	test: function (layers) {
  		return (this.mask & layers.mask) !== 0
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author mikael emtinger / http://gomo.se/
   * @author alteredq / http://alteredqualia.com/
   * @author WestLangley / http://github.com/WestLangley
   * @author elephantatwork / www.elephantatwork.ch
   */

  var object3DId = 0

  function Object3D () {
  	Object.defineProperty(this, 'id', { value: object3DId++ })

  	this.uuid = _Math.generateUUID()

  	this.name = ''
  	this.type = 'Object3D'

  	this.parent = null
  	this.children = []

  	this.up = Object3D.DefaultUp.clone()

  	var position = new Vector3()
  	var rotation = new Euler()
  	var quaternion = new Quaternion()
  	var scale = new Vector3(1, 1, 1)

  	function onRotationChange () {
  		quaternion.setFromEuler(rotation, false)
  	}

  	function onQuaternionChange () {
  		rotation.setFromQuaternion(quaternion, undefined, false)
  	}

  	rotation.onChange(onRotationChange)
  	quaternion.onChange(onQuaternionChange)

  	Object.defineProperties(this, {
  		position: {
  			enumerable: true,
  			value: position
  		},
  		rotation: {
  			enumerable: true,
  			value: rotation
  		},
  		quaternion: {
  			enumerable: true,
  			value: quaternion
  		},
  		scale: {
  			enumerable: true,
  			value: scale
  		},
  		modelViewMatrix: {
  			value: new Matrix4()
  		},
  		normalMatrix: {
  			value: new Matrix3()
  		}
  	})

  	this.matrix = new Matrix4()
  	this.matrixWorld = new Matrix4()

  	this.matrixAutoUpdate = Object3D.DefaultMatrixAutoUpdate
  	this.matrixWorldNeedsUpdate = false

  	this.layers = new Layers()
  	this.visible = true

  	this.castShadow = false
  	this.receiveShadow = false

  	this.frustumCulled = true
  	this.renderOrder = 0

  	this.userData = {}
  }

  Object3D.DefaultUp = new Vector3(0, 1, 0)
  Object3D.DefaultMatrixAutoUpdate = true

  Object3D.prototype = Object.assign(Object.create(EventDispatcher.prototype), {

  	constructor: Object3D,

  	isObject3D: true,

  	onBeforeRender: function () {},
  	onAfterRender: function () {},

  	applyMatrix: function (matrix) {
  		this.matrix.multiplyMatrices(matrix, this.matrix)

  		this.matrix.decompose(this.position, this.quaternion, this.scale)
  	},

  	applyQuaternion: function (q) {
  		this.quaternion.premultiply(q)

  		return this
  	},

  	setRotationFromAxisAngle: function (axis, angle) {
  		// assumes axis is normalized

  		this.quaternion.setFromAxisAngle(axis, angle)
  	},

  	setRotationFromEuler: function (euler) {
  		this.quaternion.setFromEuler(euler, true)
  	},

  	setRotationFromMatrix: function (m) {
  		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

  		this.quaternion.setFromRotationMatrix(m)
  	},

  	setRotationFromQuaternion: function (q) {
  		// assumes q is normalized

  		this.quaternion.copy(q)
  	},

  	rotateOnAxis: (function () {
  		// rotate object on axis in object space
  		// axis is assumed to be normalized

  		var q1 = new Quaternion()

  		return function rotateOnAxis (axis, angle) {
  			q1.setFromAxisAngle(axis, angle)

  			this.quaternion.multiply(q1)

  			return this
  		}
  	}()),

  	rotateOnWorldAxis: (function () {
  		// rotate object on axis in world space
  		// axis is assumed to be normalized
  		// method assumes no rotated parent

  		var q1 = new Quaternion()

  		return function rotateOnWorldAxis (axis, angle) {
  			q1.setFromAxisAngle(axis, angle)

  			this.quaternion.premultiply(q1)

  			return this
  		}
  	}()),

  	rotateX: (function () {
  		var v1 = new Vector3(1, 0, 0)

  		return function rotateX (angle) {
  			return this.rotateOnAxis(v1, angle)
  		}
  	}()),

  	rotateY: (function () {
  		var v1 = new Vector3(0, 1, 0)

  		return function rotateY (angle) {
  			return this.rotateOnAxis(v1, angle)
  		}
  	}()),

  	rotateZ: (function () {
  		var v1 = new Vector3(0, 0, 1)

  		return function rotateZ (angle) {
  			return this.rotateOnAxis(v1, angle)
  		}
  	}()),

  	translateOnAxis: (function () {
  		// translate object by distance along axis in object space
  		// axis is assumed to be normalized

  		var v1 = new Vector3()

  		return function translateOnAxis (axis, distance) {
  			v1.copy(axis).applyQuaternion(this.quaternion)

  			this.position.add(v1.multiplyScalar(distance))

  			return this
  		}
  	}()),

  	translateX: (function () {
  		var v1 = new Vector3(1, 0, 0)

  		return function translateX (distance) {
  			return this.translateOnAxis(v1, distance)
  		}
  	}()),

  	translateY: (function () {
  		var v1 = new Vector3(0, 1, 0)

  		return function translateY (distance) {
  			return this.translateOnAxis(v1, distance)
  		}
  	}()),

  	translateZ: (function () {
  		var v1 = new Vector3(0, 0, 1)

  		return function translateZ (distance) {
  			return this.translateOnAxis(v1, distance)
  		}
  	}()),

  	localToWorld: function (vector) {
  		return vector.applyMatrix4(this.matrixWorld)
  	},

  	worldToLocal: (function () {
  		var m1 = new Matrix4()

  		return function worldToLocal (vector) {
  			return vector.applyMatrix4(m1.getInverse(this.matrixWorld))
  		}
  	}()),

  	lookAt: (function () {
  		// This method does not support objects with rotated and/or translated parent(s)

  		var m1 = new Matrix4()
  		var vector = new Vector3()

  		return function lookAt (x, y, z) {
  			if (x.isVector3) {
  				vector.copy(x)
  			} else {
  				vector.set(x, y, z)
  			}

  			if (this.isCamera) {
  				m1.lookAt(this.position, vector, this.up)
  			} else {
  				m1.lookAt(vector, this.position, this.up)
  			}

  			this.quaternion.setFromRotationMatrix(m1)
  		}
  	}()),

  	add: function (object) {
  		if (arguments.length > 1) {
  			for (var i = 0; i < arguments.length; i++) {
  				this.add(arguments[i])
  			}

  			return this
  		}

  		if (object === this) {
  			console.error("THREE.Object3D.add: object can't be added as a child of itself.", object)
  			return this
  		}

  		if ((object && object.isObject3D)) {
  			if (object.parent !== null) {
  				object.parent.remove(object)
  			}

  			object.parent = this
  			object.dispatchEvent({ type: 'added' })

  			this.children.push(object)
  		} else {
  			console.error('THREE.Object3D.add: object not an instance of THREE.Object3D.', object)
  		}

  		return this
  	},

  	remove: function (object) {
  		if (arguments.length > 1) {
  			for (var i = 0; i < arguments.length; i++) {
  				this.remove(arguments[i])
  			}

  			return this
  		}

  		var index = this.children.indexOf(object)

  		if (index !== -1) {
  			object.parent = null

  			object.dispatchEvent({ type: 'removed' })

  			this.children.splice(index, 1)
  		}

  		return this
  	},

  	getObjectById: function (id) {
  		return this.getObjectByProperty('id', id)
  	},

  	getObjectByName: function (name) {
  		return this.getObjectByProperty('name', name)
  	},

  	getObjectByProperty: function (name, value) {
  		if (this[name] === value) return this

  		for (var i = 0, l = this.children.length; i < l; i++) {
  			var child = this.children[i]
  			var object = child.getObjectByProperty(name, value)

  			if (object !== undefined) {
  				return object
  			}
  		}

  		return undefined
  	},

  	getWorldPosition: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Object3D: .getWorldPosition() target is now required')
  			target = new Vector3()
  		}

  		this.updateMatrixWorld(true)

  		return target.setFromMatrixPosition(this.matrixWorld)
  	},

  	getWorldQuaternion: (function () {
  		var position = new Vector3()
  		var scale = new Vector3()

  		return function getWorldQuaternion (target) {
  			if (target === undefined) {
  				console.warn('THREE.Object3D: .getWorldQuaternion() target is now required')
  				target = new Quaternion()
  			}

  			this.updateMatrixWorld(true)

  			this.matrixWorld.decompose(position, target, scale)

  			return target
  		}
  	}()),

  	getWorldScale: (function () {
  		var position = new Vector3()
  		var quaternion = new Quaternion()

  		return function getWorldScale (target) {
  			if (target === undefined) {
  				console.warn('THREE.Object3D: .getWorldScale() target is now required')
  				target = new Vector3()
  			}

  			this.updateMatrixWorld(true)

  			this.matrixWorld.decompose(position, quaternion, target)

  			return target
  		}
  	}()),

  	getWorldDirection: (function () {
  		var quaternion = new Quaternion()

  		return function getWorldDirection (target) {
  			if (target === undefined) {
  				console.warn('THREE.Object3D: .getWorldDirection() target is now required')
  				target = new Vector3()
  			}

  			this.getWorldQuaternion(quaternion)

  			return target.set(0, 0, 1).applyQuaternion(quaternion)
  		}
  	}()),

  	raycast: function () {},

  	traverse: function (callback) {
  		callback(this)

  		var children = this.children

  		for (var i = 0, l = children.length; i < l; i++) {
  			children[i].traverse(callback)
  		}
  	},

  	traverseVisible: function (callback) {
  		if (this.visible === false) return

  		callback(this)

  		var children = this.children

  		for (var i = 0, l = children.length; i < l; i++) {
  			children[i].traverseVisible(callback)
  		}
  	},

  	traverseAncestors: function (callback) {
  		var parent = this.parent

  		if (parent !== null) {
  			callback(parent)

  			parent.traverseAncestors(callback)
  		}
  	},

  	updateMatrix: function () {
  		this.matrix.compose(this.position, this.quaternion, this.scale)

  		this.matrixWorldNeedsUpdate = true
  	},

  	updateMatrixWorld: function (force) {
  		if (this.matrixAutoUpdate) this.updateMatrix()

  		if (this.matrixWorldNeedsUpdate || force) {
  			if (this.parent === null) {
  				this.matrixWorld.copy(this.matrix)
  			} else {
  				this.matrixWorld.multiplyMatrices(this.parent.matrixWorld, this.matrix)
  			}

  			this.matrixWorldNeedsUpdate = false

  			force = true
  		}

  		// update children

  		var children = this.children

  		for (var i = 0, l = children.length; i < l; i++) {
  			children[i].updateMatrixWorld(force)
  		}
  	},

  	toJSON: function (meta) {
  		// meta is a string when called from JSON.stringify
  		var isRootObject = (meta === undefined || typeof meta === 'string')

  		var output = {}

  		// meta is a hash used to collect geometries, materials.
  		// not providing it implies that this is the root object
  		// being serialized.
  		if (isRootObject) {
  			// initialize meta obj
  			meta = {
  				geometries: {},
  				materials: {},
  				textures: {},
  				images: {},
  				shapes: {}
  			}

  			output.metadata = {
  				version: 4.5,
  				type: 'Object',
  				generator: 'Object3D.toJSON'
  			}
  		}

  		// standard Object3D serialization

  		var object = {}

  		object.uuid = this.uuid
  		object.type = this.type

  		if (this.name !== '') object.name = this.name
  		if (this.castShadow === true) object.castShadow = true
  		if (this.receiveShadow === true) object.receiveShadow = true
  		if (this.visible === false) object.visible = false
  		if (this.frustumCulled === false) object.frustumCulled = false
  		if (this.renderOrder !== 0) object.renderOrder = this.renderOrder
  		if (JSON.stringify(this.userData) !== '{}') object.userData = this.userData

  		object.matrix = this.matrix.toArray()

  		if (this.matrixAutoUpdate === false) object.matrixAutoUpdate = false

  		//

  		function serialize (library, element) {
  			if (library[element.uuid] === undefined) {
  				library[element.uuid] = element.toJSON(meta)
  			}

  			return element.uuid
  		}

  		if (this.geometry !== undefined) {
  			object.geometry = serialize(meta.geometries, this.geometry)

  			var parameters = this.geometry.parameters

  			if (parameters !== undefined && parameters.shapes !== undefined) {
  				var shapes = parameters.shapes

  				if (Array.isArray(shapes)) {
  					for (var i = 0, l = shapes.length; i < l; i++) {
  						var shape = shapes[i]

  						serialize(meta.shapes, shape)
  					}
  				} else {
  					serialize(meta.shapes, shapes)
  				}
  			}
  		}

  		if (this.material !== undefined) {
  			if (Array.isArray(this.material)) {
  				var uuids = []

  				for (var i = 0, l = this.material.length; i < l; i++) {
  					uuids.push(serialize(meta.materials, this.material[i]))
  				}

  				object.material = uuids
  			} else {
  				object.material = serialize(meta.materials, this.material)
  			}
  		}

  		//

  		if (this.children.length > 0) {
  			object.children = []

  			for (var i = 0; i < this.children.length; i++) {
  				object.children.push(this.children[i].toJSON(meta).object)
  			}
  		}

  		if (isRootObject) {
  			var geometries = extractFromCache(meta.geometries)
  			var materials = extractFromCache(meta.materials)
  			var textures = extractFromCache(meta.textures)
  			var images = extractFromCache(meta.images)
  			var shapes = extractFromCache(meta.shapes)

  			if (geometries.length > 0) output.geometries = geometries
  			if (materials.length > 0) output.materials = materials
  			if (textures.length > 0) output.textures = textures
  			if (images.length > 0) output.images = images
  			if (shapes.length > 0) output.shapes = shapes
  		}

  		output.object = object

  		return output

  		// extract data from the cache hash
  		// remove metadata on each item
  		// and return as array
  		function extractFromCache (cache) {
  			var values = []
  			for (var key in cache) {
  				var data = cache[key]
  				delete data.metadata
  				values.push(data)
  			}
  			return values
  		}
  	},

  	clone: function (recursive) {
  		return new this.constructor().copy(this, recursive)
  	},

  	copy: function (source, recursive) {
  		if (recursive === undefined) recursive = true

  		this.name = source.name

  		this.up.copy(source.up)

  		this.position.copy(source.position)
  		this.quaternion.copy(source.quaternion)
  		this.scale.copy(source.scale)

  		this.matrix.copy(source.matrix)
  		this.matrixWorld.copy(source.matrixWorld)

  		this.matrixAutoUpdate = source.matrixAutoUpdate
  		this.matrixWorldNeedsUpdate = source.matrixWorldNeedsUpdate

  		this.layers.mask = source.layers.mask
  		this.visible = source.visible

  		this.castShadow = source.castShadow
  		this.receiveShadow = source.receiveShadow

  		this.frustumCulled = source.frustumCulled
  		this.renderOrder = source.renderOrder

  		this.userData = JSON.parse(JSON.stringify(source.userData))

  		if (recursive === true) {
  			for (var i = 0; i < source.children.length; i++) {
  				var child = source.children[i]
  				this.add(child.clone())
  			}
  		}

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author mikael emtinger / http://gomo.se/
   * @author WestLangley / http://github.com/WestLangley
  */

  function Camera () {
  	Object3D.call(this)

  	this.type = 'Camera'

  	this.matrixWorldInverse = new Matrix4()
  	this.projectionMatrix = new Matrix4()
  }

  Camera.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Camera,

  	isCamera: true,

  	copy: function (source, recursive) {
  		Object3D.prototype.copy.call(this, source, recursive)

  		this.matrixWorldInverse.copy(source.matrixWorldInverse)
  		this.projectionMatrix.copy(source.projectionMatrix)

  		return this
  	},

  	getWorldDirection: (function () {
  		var quaternion = new Quaternion()

  		return function getWorldDirection (target) {
  			if (target === undefined) {
  				console.warn('THREE.Camera: .getWorldDirection() target is now required')
  				target = new Vector3()
  			}

  			this.getWorldQuaternion(quaternion)

  			return target.set(0, 0, -1).applyQuaternion(quaternion)
  		}
  	}()),

  	updateMatrixWorld: function (force) {
  		Object3D.prototype.updateMatrixWorld.call(this, force)

  		this.matrixWorldInverse.getInverse(this.matrixWorld)
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author arose / http://github.com/arose
   */

  function OrthographicCamera (left, right, top, bottom, near, far) {
  	Camera.call(this)

  	this.type = 'OrthographicCamera'

  	this.zoom = 1
  	this.view = null

  	this.left = left
  	this.right = right
  	this.top = top
  	this.bottom = bottom

  	this.near = (near !== undefined) ? near : 0.1
  	this.far = (far !== undefined) ? far : 2000

  	this.updateProjectionMatrix()
  }

  OrthographicCamera.prototype = Object.assign(Object.create(Camera.prototype), {

  	constructor: OrthographicCamera,

  	isOrthographicCamera: true,

  	copy: function (source, recursive) {
  		Camera.prototype.copy.call(this, source, recursive)

  		this.left = source.left
  		this.right = source.right
  		this.top = source.top
  		this.bottom = source.bottom
  		this.near = source.near
  		this.far = source.far

  		this.zoom = source.zoom
  		this.view = source.view === null ? null : Object.assign({}, source.view)

  		return this
  	},

  	setViewOffset: function (fullWidth, fullHeight, x, y, width, height) {
  		if (this.view === null) {
  			this.view = {
  				enabled: true,
  				fullWidth: 1,
  				fullHeight: 1,
  				offsetX: 0,
  				offsetY: 0,
  				width: 1,
  				height: 1
  			}
  		}

  		this.view.enabled = true
  		this.view.fullWidth = fullWidth
  		this.view.fullHeight = fullHeight
  		this.view.offsetX = x
  		this.view.offsetY = y
  		this.view.width = width
  		this.view.height = height

  		this.updateProjectionMatrix()
  	},

  	clearViewOffset: function () {
  		if (this.view !== null) {
  			this.view.enabled = false
  		}

  		this.updateProjectionMatrix()
  	},

  	updateProjectionMatrix: function () {
  		var dx = (this.right - this.left) / (2 * this.zoom)
  		var dy = (this.top - this.bottom) / (2 * this.zoom)
  		var cx = (this.right + this.left) / 2
  		var cy = (this.top + this.bottom) / 2

  		var left = cx - dx
  		var right = cx + dx
  		var top = cy + dy
  		var bottom = cy - dy

  		if (this.view !== null && this.view.enabled) {
  			var zoomW = this.zoom / (this.view.width / this.view.fullWidth)
  			var zoomH = this.zoom / (this.view.height / this.view.fullHeight)
  			var scaleW = (this.right - this.left) / this.view.width
  			var scaleH = (this.top - this.bottom) / this.view.height

  			left += scaleW * (this.view.offsetX / zoomW)
  			right = left + scaleW * (this.view.width / zoomW)
  			top -= scaleH * (this.view.offsetY / zoomH)
  			bottom = top - scaleH * (this.view.height / zoomH)
  		}

  		this.projectionMatrix.makeOrthographic(left, right, top, bottom, this.near, this.far)
  	},

  	toJSON: function (meta) {
  		var data = Object3D.prototype.toJSON.call(this, meta)

  		data.object.zoom = this.zoom
  		data.object.left = this.left
  		data.object.right = this.right
  		data.object.top = this.top
  		data.object.bottom = this.bottom
  		data.object.near = this.near
  		data.object.far = this.far

  		if (this.view !== null) data.object.view = Object.assign({}, this.view)

  		return data
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   */

  function Face3 (a, b, c, normal, color, materialIndex) {
  	this.a = a
  	this.b = b
  	this.c = c

  	this.normal = (normal && normal.isVector3) ? normal : new Vector3()
  	this.vertexNormals = Array.isArray(normal) ? normal : []

  	this.color = (color && color.isColor) ? color : new Color()
  	this.vertexColors = Array.isArray(color) ? color : []

  	this.materialIndex = materialIndex !== undefined ? materialIndex : 0
  }

  Object.assign(Face3.prototype, {

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (source) {
  		this.a = source.a
  		this.b = source.b
  		this.c = source.c

  		this.normal.copy(source.normal)
  		this.color.copy(source.color)

  		this.materialIndex = source.materialIndex

  		for (var i = 0, il = source.vertexNormals.length; i < il; i++) {
  			this.vertexNormals[i] = source.vertexNormals[i].clone()
  		}

  		for (var i = 0, il = source.vertexColors.length; i < il; i++) {
  			this.vertexColors[i] = source.vertexColors[i].clone()
  		}

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author kile / http://kile.stravaganza.org/
   * @author alteredq / http://alteredqualia.com/
   * @author mikael emtinger / http://gomo.se/
   * @author zz85 / http://www.lab4games.net/zz85/blog
   * @author bhouston / http://clara.io
   */

  var geometryId = 0 // Geometry uses even numbers as Id

  function Geometry () {
  	Object.defineProperty(this, 'id', { value: geometryId += 2 })

  	this.uuid = _Math.generateUUID()

  	this.name = ''
  	this.type = 'Geometry'

  	this.vertices = []
  	this.colors = []
  	this.faces = []
  	this.faceVertexUvs = [[]]

  	this.morphTargets = []
  	this.morphNormals = []

  	this.skinWeights = []
  	this.skinIndices = []

  	this.lineDistances = []

  	this.boundingBox = null
  	this.boundingSphere = null

  	// update flags

  	this.elementsNeedUpdate = false
  	this.verticesNeedUpdate = false
  	this.uvsNeedUpdate = false
  	this.normalsNeedUpdate = false
  	this.colorsNeedUpdate = false
  	this.lineDistancesNeedUpdate = false
  	this.groupsNeedUpdate = false
  }

  Geometry.prototype = Object.assign(Object.create(EventDispatcher.prototype), {

  	constructor: Geometry,

  	isGeometry: true,

  	applyMatrix: function (matrix) {
  		var normalMatrix = new Matrix3().getNormalMatrix(matrix)

  		for (var i = 0, il = this.vertices.length; i < il; i++) {
  			var vertex = this.vertices[i]
  			vertex.applyMatrix4(matrix)
  		}

  		for (var i = 0, il = this.faces.length; i < il; i++) {
  			var face = this.faces[i]
  			face.normal.applyMatrix3(normalMatrix).normalize()

  			for (var j = 0, jl = face.vertexNormals.length; j < jl; j++) {
  				face.vertexNormals[j].applyMatrix3(normalMatrix).normalize()
  			}
  		}

  		if (this.boundingBox !== null) {
  			this.computeBoundingBox()
  		}

  		if (this.boundingSphere !== null) {
  			this.computeBoundingSphere()
  		}

  		this.verticesNeedUpdate = true
  		this.normalsNeedUpdate = true

  		return this
  	},

  	rotateX: (function () {
  		// rotate geometry around world x-axis

  		var m1 = new Matrix4()

  		return function rotateX (angle) {
  			m1.makeRotationX(angle)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	rotateY: (function () {
  		// rotate geometry around world y-axis

  		var m1 = new Matrix4()

  		return function rotateY (angle) {
  			m1.makeRotationY(angle)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	rotateZ: (function () {
  		// rotate geometry around world z-axis

  		var m1 = new Matrix4()

  		return function rotateZ (angle) {
  			m1.makeRotationZ(angle)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	translate: (function () {
  		// translate geometry

  		var m1 = new Matrix4()

  		return function translate (x, y, z) {
  			m1.makeTranslation(x, y, z)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	scale: (function () {
  		// scale geometry

  		var m1 = new Matrix4()

  		return function scale (x, y, z) {
  			m1.makeScale(x, y, z)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	lookAt: (function () {
  		var obj = new Object3D()

  		return function lookAt (vector) {
  			obj.lookAt(vector)

  			obj.updateMatrix()

  			this.applyMatrix(obj.matrix)
  		}
  	}()),

  	fromBufferGeometry: function (geometry) {
  		var scope = this

  		var indices = geometry.index !== null ? geometry.index.array : undefined
  		var attributes = geometry.attributes

  		var positions = attributes.position.array
  		var normals = attributes.normal !== undefined ? attributes.normal.array : undefined
  		var colors = attributes.color !== undefined ? attributes.color.array : undefined
  		var uvs = attributes.uv !== undefined ? attributes.uv.array : undefined
  		var uvs2 = attributes.uv2 !== undefined ? attributes.uv2.array : undefined

  		if (uvs2 !== undefined) this.faceVertexUvs[1] = []

  		var tempNormals = []
  		var tempUVs = []
  		var tempUVs2 = []

  		for (var i = 0, j = 0; i < positions.length; i += 3, j += 2) {
  			scope.vertices.push(new Vector3(positions[i], positions[i + 1], positions[i + 2]))

  			if (normals !== undefined) {
  				tempNormals.push(new Vector3(normals[i], normals[i + 1], normals[i + 2]))
  			}

  			if (colors !== undefined) {
  				scope.colors.push(new Color(colors[i], colors[i + 1], colors[i + 2]))
  			}

  			if (uvs !== undefined) {
  				tempUVs.push(new Vector2(uvs[j], uvs[j + 1]))
  			}

  			if (uvs2 !== undefined) {
  				tempUVs2.push(new Vector2(uvs2[j], uvs2[j + 1]))
  			}
  		}

  		function addFace (a, b, c, materialIndex) {
  			var vertexNormals = normals !== undefined ? [tempNormals[a].clone(), tempNormals[b].clone(), tempNormals[c].clone()] : []
  			var vertexColors = colors !== undefined ? [scope.colors[a].clone(), scope.colors[b].clone(), scope.colors[c].clone()] : []

  			var face = new Face3(a, b, c, vertexNormals, vertexColors, materialIndex)

  			scope.faces.push(face)

  			if (uvs !== undefined) {
  				scope.faceVertexUvs[0].push([tempUVs[a].clone(), tempUVs[b].clone(), tempUVs[c].clone()])
  			}

  			if (uvs2 !== undefined) {
  				scope.faceVertexUvs[1].push([tempUVs2[a].clone(), tempUVs2[b].clone(), tempUVs2[c].clone()])
  			}
  		}

  		var groups = geometry.groups

  		if (groups.length > 0) {
  			for (var i = 0; i < groups.length; i++) {
  				var group = groups[i]

  				var start = group.start
  				var count = group.count

  				for (var j = start, jl = start + count; j < jl; j += 3) {
  					if (indices !== undefined) {
  						addFace(indices[j], indices[j + 1], indices[j + 2], group.materialIndex)
  					} else {
  						addFace(j, j + 1, j + 2, group.materialIndex)
  					}
  				}
  			}
  		} else {
  			if (indices !== undefined) {
  				for (var i = 0; i < indices.length; i += 3) {
  					addFace(indices[i], indices[i + 1], indices[i + 2])
  				}
  			} else {
  				for (var i = 0; i < positions.length / 3; i += 3) {
  					addFace(i, i + 1, i + 2)
  				}
  			}
  		}

  		this.computeFaceNormals()

  		if (geometry.boundingBox !== null) {
  			this.boundingBox = geometry.boundingBox.clone()
  		}

  		if (geometry.boundingSphere !== null) {
  			this.boundingSphere = geometry.boundingSphere.clone()
  		}

  		return this
  	},

  	center: (function () {
  		var offset = new Vector3()

  		return function center () {
  			this.computeBoundingBox()

  			this.boundingBox.getCenter(offset).negate()

  			this.translate(offset.x, offset.y, offset.z)

  			return this
  		}
  	}()),

  	normalize: function () {
  		this.computeBoundingSphere()

  		var center = this.boundingSphere.center
  		var radius = this.boundingSphere.radius

  		var s = radius === 0 ? 1 : 1.0 / radius

  		var matrix = new Matrix4()
  		matrix.set(
  			s, 0, 0, -s * center.x,
  			0, s, 0, -s * center.y,
  			0, 0, s, -s * center.z,
  			0, 0, 0, 1
  		)

  		this.applyMatrix(matrix)

  		return this
  	},

  	computeFaceNormals: function () {
  		var cb = new Vector3(); var ab = new Vector3()

  		for (var f = 0, fl = this.faces.length; f < fl; f++) {
  			var face = this.faces[f]

  			var vA = this.vertices[face.a]
  			var vB = this.vertices[face.b]
  			var vC = this.vertices[face.c]

  			cb.subVectors(vC, vB)
  			ab.subVectors(vA, vB)
  			cb.cross(ab)

  			cb.normalize()

  			face.normal.copy(cb)
  		}
  	},

  	computeVertexNormals: function (areaWeighted) {
  		if (areaWeighted === undefined) areaWeighted = true

  		var v, vl, f, fl, face, vertices

  		vertices = new Array(this.vertices.length)

  		for (v = 0, vl = this.vertices.length; v < vl; v++) {
  			vertices[v] = new Vector3()
  		}

  		if (areaWeighted) {
  			// vertex normals weighted by triangle areas
  			// http://www.iquilezles.org/www/articles/normals/normals.htm

  			var vA, vB, vC
  			var cb = new Vector3(); var ab = new Vector3()

  			for (f = 0, fl = this.faces.length; f < fl; f++) {
  				face = this.faces[f]

  				vA = this.vertices[face.a]
  				vB = this.vertices[face.b]
  				vC = this.vertices[face.c]

  				cb.subVectors(vC, vB)
  				ab.subVectors(vA, vB)
  				cb.cross(ab)

  				vertices[face.a].add(cb)
  				vertices[face.b].add(cb)
  				vertices[face.c].add(cb)
  			}
  		} else {
  			this.computeFaceNormals()

  			for (f = 0, fl = this.faces.length; f < fl; f++) {
  				face = this.faces[f]

  				vertices[face.a].add(face.normal)
  				vertices[face.b].add(face.normal)
  				vertices[face.c].add(face.normal)
  			}
  		}

  		for (v = 0, vl = this.vertices.length; v < vl; v++) {
  			vertices[v].normalize()
  		}

  		for (f = 0, fl = this.faces.length; f < fl; f++) {
  			face = this.faces[f]

  			var vertexNormals = face.vertexNormals

  			if (vertexNormals.length === 3) {
  				vertexNormals[0].copy(vertices[face.a])
  				vertexNormals[1].copy(vertices[face.b])
  				vertexNormals[2].copy(vertices[face.c])
  			} else {
  				vertexNormals[0] = vertices[face.a].clone()
  				vertexNormals[1] = vertices[face.b].clone()
  				vertexNormals[2] = vertices[face.c].clone()
  			}
  		}

  		if (this.faces.length > 0) {
  			this.normalsNeedUpdate = true
  		}
  	},

  	computeFlatVertexNormals: function () {
  		var f, fl, face

  		this.computeFaceNormals()

  		for (f = 0, fl = this.faces.length; f < fl; f++) {
  			face = this.faces[f]

  			var vertexNormals = face.vertexNormals

  			if (vertexNormals.length === 3) {
  				vertexNormals[0].copy(face.normal)
  				vertexNormals[1].copy(face.normal)
  				vertexNormals[2].copy(face.normal)
  			} else {
  				vertexNormals[0] = face.normal.clone()
  				vertexNormals[1] = face.normal.clone()
  				vertexNormals[2] = face.normal.clone()
  			}
  		}

  		if (this.faces.length > 0) {
  			this.normalsNeedUpdate = true
  		}
  	},

  	computeMorphNormals: function () {
  		var i, il, f, fl, face

  		// save original normals
  		// - create temp variables on first access
  		//   otherwise just copy (for faster repeated calls)

  		for (f = 0, fl = this.faces.length; f < fl; f++) {
  			face = this.faces[f]

  			if (!face.__originalFaceNormal) {
  				face.__originalFaceNormal = face.normal.clone()
  			} else {
  				face.__originalFaceNormal.copy(face.normal)
  			}

  			if (!face.__originalVertexNormals) face.__originalVertexNormals = []

  			for (i = 0, il = face.vertexNormals.length; i < il; i++) {
  				if (!face.__originalVertexNormals[i]) {
  					face.__originalVertexNormals[i] = face.vertexNormals[i].clone()
  				} else {
  					face.__originalVertexNormals[i].copy(face.vertexNormals[i])
  				}
  			}
  		}

  		// use temp geometry to compute face and vertex normals for each morph

  		var tmpGeo = new Geometry()
  		tmpGeo.faces = this.faces

  		for (i = 0, il = this.morphTargets.length; i < il; i++) {
  			// create on first access

  			if (!this.morphNormals[i]) {
  				this.morphNormals[i] = {}
  				this.morphNormals[i].faceNormals = []
  				this.morphNormals[i].vertexNormals = []

  				var dstNormalsFace = this.morphNormals[i].faceNormals
  				var dstNormalsVertex = this.morphNormals[i].vertexNormals

  				var faceNormal, vertexNormals

  				for (f = 0, fl = this.faces.length; f < fl; f++) {
  					faceNormal = new Vector3()
  					vertexNormals = { a: new Vector3(), b: new Vector3(), c: new Vector3() }

  					dstNormalsFace.push(faceNormal)
  					dstNormalsVertex.push(vertexNormals)
  				}
  			}

  			var morphNormals = this.morphNormals[i]

  			// set vertices to morph target

  			tmpGeo.vertices = this.morphTargets[i].vertices

  			// compute morph normals

  			tmpGeo.computeFaceNormals()
  			tmpGeo.computeVertexNormals()

  			// store morph normals

  			var faceNormal, vertexNormals

  			for (f = 0, fl = this.faces.length; f < fl; f++) {
  				face = this.faces[f]

  				faceNormal = morphNormals.faceNormals[f]
  				vertexNormals = morphNormals.vertexNormals[f]

  				faceNormal.copy(face.normal)

  				vertexNormals.a.copy(face.vertexNormals[0])
  				vertexNormals.b.copy(face.vertexNormals[1])
  				vertexNormals.c.copy(face.vertexNormals[2])
  			}
  		}

  		// restore original normals

  		for (f = 0, fl = this.faces.length; f < fl; f++) {
  			face = this.faces[f]

  			face.normal = face.__originalFaceNormal
  			face.vertexNormals = face.__originalVertexNormals
  		}
  	},

  	computeBoundingBox: function () {
  		if (this.boundingBox === null) {
  			this.boundingBox = new Box3()
  		}

  		this.boundingBox.setFromPoints(this.vertices)
  	},

  	computeBoundingSphere: function () {
  		if (this.boundingSphere === null) {
  			this.boundingSphere = new Sphere()
  		}

  		this.boundingSphere.setFromPoints(this.vertices)
  	},

  	merge: function (geometry, matrix, materialIndexOffset) {
  		if (!(geometry && geometry.isGeometry)) {
  			console.error('THREE.Geometry.merge(): geometry not an instance of THREE.Geometry.', geometry)
  			return
  		}

  		var normalMatrix
  			var vertexOffset = this.vertices.length
  			var vertices1 = this.vertices
  			var vertices2 = geometry.vertices
  			var faces1 = this.faces
  			var faces2 = geometry.faces
  			var uvs1 = this.faceVertexUvs[0]
  			var uvs2 = geometry.faceVertexUvs[0]
  			var colors1 = this.colors
  			var colors2 = geometry.colors

  		if (materialIndexOffset === undefined) materialIndexOffset = 0

  		if (matrix !== undefined) {
  			normalMatrix = new Matrix3().getNormalMatrix(matrix)
  		}

  		// vertices

  		for (var i = 0, il = vertices2.length; i < il; i++) {
  			var vertex = vertices2[i]

  			var vertexCopy = vertex.clone()

  			if (matrix !== undefined) vertexCopy.applyMatrix4(matrix)

  			vertices1.push(vertexCopy)
  		}

  		// colors

  		for (var i = 0, il = colors2.length; i < il; i++) {
  			colors1.push(colors2[i].clone())
  		}

  		// faces

  		for (i = 0, il = faces2.length; i < il; i++) {
  			var face = faces2[i]; var faceCopy; var normal; var color
  				var faceVertexNormals = face.vertexNormals
  				var faceVertexColors = face.vertexColors

  			faceCopy = new Face3(face.a + vertexOffset, face.b + vertexOffset, face.c + vertexOffset)
  			faceCopy.normal.copy(face.normal)

  			if (normalMatrix !== undefined) {
  				faceCopy.normal.applyMatrix3(normalMatrix).normalize()
  			}

  			for (var j = 0, jl = faceVertexNormals.length; j < jl; j++) {
  				normal = faceVertexNormals[j].clone()

  				if (normalMatrix !== undefined) {
  					normal.applyMatrix3(normalMatrix).normalize()
  				}

  				faceCopy.vertexNormals.push(normal)
  			}

  			faceCopy.color.copy(face.color)

  			for (var j = 0, jl = faceVertexColors.length; j < jl; j++) {
  				color = faceVertexColors[j]
  				faceCopy.vertexColors.push(color.clone())
  			}

  			faceCopy.materialIndex = face.materialIndex + materialIndexOffset

  			faces1.push(faceCopy)
  		}

  		// uvs

  		for (i = 0, il = uvs2.length; i < il; i++) {
  			var uv = uvs2[i]; var uvCopy = []

  			if (uv === undefined) {
  				continue
  			}

  			for (var j = 0, jl = uv.length; j < jl; j++) {
  				uvCopy.push(uv[j].clone())
  			}

  			uvs1.push(uvCopy)
  		}
  	},

  	mergeMesh: function (mesh) {
  		if (!(mesh && mesh.isMesh)) {
  			console.error('THREE.Geometry.mergeMesh(): mesh not an instance of THREE.Mesh.', mesh)
  			return
  		}

  		if (mesh.matrixAutoUpdate) mesh.updateMatrix()

  		this.merge(mesh.geometry, mesh.matrix)
  	},

  	/*
  	 * Checks for duplicate vertices with hashmap.
  	 * Duplicated vertices are removed
  	 * and faces' vertices are updated.
  	 */

  	mergeVertices: function () {
  		var verticesMap = {} // Hashmap for looking up vertices by position coordinates (and making sure they are unique)
  		var unique = []; var changes = []

  		var v, key
  		var precisionPoints = 4 // number of decimal points, e.g. 4 for epsilon of 0.0001
  		var precision = Math.pow(10, precisionPoints)
  		var i, il, face
  		var indices, j, jl

  		for (i = 0, il = this.vertices.length; i < il; i++) {
  			v = this.vertices[i]
  			key = Math.round(v.x * precision) + '_' + Math.round(v.y * precision) + '_' + Math.round(v.z * precision)

  			if (verticesMap[key] === undefined) {
  				verticesMap[key] = i
  				unique.push(this.vertices[i])
  				changes[i] = unique.length - 1
  			} else {
  				// console.log('Duplicate vertex found. ', i, ' could be using ', verticesMap[key]);
  				changes[i] = changes[verticesMap[key]]
  			}
  		}

  		// if faces are completely degenerate after merging vertices, we
  		// have to remove them from the geometry.
  		var faceIndicesToRemove = []

  		for (i = 0, il = this.faces.length; i < il; i++) {
  			face = this.faces[i]

  			face.a = changes[face.a]
  			face.b = changes[face.b]
  			face.c = changes[face.c]

  			indices = [face.a, face.b, face.c]

  			// if any duplicate vertices are found in a Face3
  			// we have to remove the face as nothing can be saved
  			for (var n = 0; n < 3; n++) {
  				if (indices[n] === indices[(n + 1) % 3]) {
  					faceIndicesToRemove.push(i)
  					break
  				}
  			}
  		}

  		for (i = faceIndicesToRemove.length - 1; i >= 0; i--) {
  			var idx = faceIndicesToRemove[i]

  			this.faces.splice(idx, 1)

  			for (j = 0, jl = this.faceVertexUvs.length; j < jl; j++) {
  				this.faceVertexUvs[j].splice(idx, 1)
  			}
  		}

  		// Use unique set of vertices

  		var diff = this.vertices.length - unique.length
  		this.vertices = unique
  		return diff
  	},

  	setFromPoints: function (points) {
  		this.vertices = []

  		for (var i = 0, l = points.length; i < l; i++) {
  			var point = points[i]
  			this.vertices.push(new Vector3(point.x, point.y, point.z || 0))
  		}

  		return this
  	},

  	sortFacesByMaterialIndex: function () {
  		var faces = this.faces
  		var length = faces.length

  		// tag faces

  		for (var i = 0; i < length; i++) {
  			faces[i]._id = i
  		}

  		// sort faces

  		function materialIndexSort (a, b) {
  			return a.materialIndex - b.materialIndex
  		}

  		faces.sort(materialIndexSort)

  		// sort uvs

  		var uvs1 = this.faceVertexUvs[0]
  		var uvs2 = this.faceVertexUvs[1]

  		var newUvs1, newUvs2

  		if (uvs1 && uvs1.length === length) newUvs1 = []
  		if (uvs2 && uvs2.length === length) newUvs2 = []

  		for (var i = 0; i < length; i++) {
  			var id = faces[i]._id

  			if (newUvs1) newUvs1.push(uvs1[id])
  			if (newUvs2) newUvs2.push(uvs2[id])
  		}

  		if (newUvs1) this.faceVertexUvs[0] = newUvs1
  		if (newUvs2) this.faceVertexUvs[1] = newUvs2
  	},

  	toJSON: function () {
  		var data = {
  			metadata: {
  				version: 4.5,
  				type: 'Geometry',
  				generator: 'Geometry.toJSON'
  			}
  		}

  		// standard Geometry serialization

  		data.uuid = this.uuid
  		data.type = this.type
  		if (this.name !== '') data.name = this.name

  		if (this.parameters !== undefined) {
  			var parameters = this.parameters

  			for (var key in parameters) {
  				if (parameters[key] !== undefined) data[key] = parameters[key]
  			}

  			return data
  		}

  		var vertices = []

  		for (var i = 0; i < this.vertices.length; i++) {
  			var vertex = this.vertices[i]
  			vertices.push(vertex.x, vertex.y, vertex.z)
  		}

  		var faces = []
  		var normals = []
  		var normalsHash = {}
  		var colors = []
  		var colorsHash = {}
  		var uvs = []
  		var uvsHash = {}

  		for (var i = 0; i < this.faces.length; i++) {
  			var face = this.faces[i]

  			var hasMaterial = true
  			var hasFaceUv = false // deprecated
  			var hasFaceVertexUv = this.faceVertexUvs[0][i] !== undefined
  			var hasFaceNormal = face.normal.length() > 0
  			var hasFaceVertexNormal = face.vertexNormals.length > 0
  			var hasFaceColor = face.color.r !== 1 || face.color.g !== 1 || face.color.b !== 1
  			var hasFaceVertexColor = face.vertexColors.length > 0

  			var faceType = 0

  			faceType = setBit(faceType, 0, 0) // isQuad
  			faceType = setBit(faceType, 1, hasMaterial)
  			faceType = setBit(faceType, 2, hasFaceUv)
  			faceType = setBit(faceType, 3, hasFaceVertexUv)
  			faceType = setBit(faceType, 4, hasFaceNormal)
  			faceType = setBit(faceType, 5, hasFaceVertexNormal)
  			faceType = setBit(faceType, 6, hasFaceColor)
  			faceType = setBit(faceType, 7, hasFaceVertexColor)

  			faces.push(faceType)
  			faces.push(face.a, face.b, face.c)
  			faces.push(face.materialIndex)

  			if (hasFaceVertexUv) {
  				var faceVertexUvs = this.faceVertexUvs[0][i]

  				faces.push(
  					getUvIndex(faceVertexUvs[0]),
  					getUvIndex(faceVertexUvs[1]),
  					getUvIndex(faceVertexUvs[2])
  				)
  			}

  			if (hasFaceNormal) {
  				faces.push(getNormalIndex(face.normal))
  			}

  			if (hasFaceVertexNormal) {
  				var vertexNormals = face.vertexNormals

  				faces.push(
  					getNormalIndex(vertexNormals[0]),
  					getNormalIndex(vertexNormals[1]),
  					getNormalIndex(vertexNormals[2])
  				)
  			}

  			if (hasFaceColor) {
  				faces.push(getColorIndex(face.color))
  			}

  			if (hasFaceVertexColor) {
  				var vertexColors = face.vertexColors

  				faces.push(
  					getColorIndex(vertexColors[0]),
  					getColorIndex(vertexColors[1]),
  					getColorIndex(vertexColors[2])
  				)
  			}
  		}

  		function setBit (value, position, enabled) {
  			return enabled ? value | (1 << position) : value & (~(1 << position))
  		}

  		function getNormalIndex (normal) {
  			var hash = normal.x.toString() + normal.y.toString() + normal.z.toString()

  			if (normalsHash[hash] !== undefined) {
  				return normalsHash[hash]
  			}

  			normalsHash[hash] = normals.length / 3
  			normals.push(normal.x, normal.y, normal.z)

  			return normalsHash[hash]
  		}

  		function getColorIndex (color) {
  			var hash = color.r.toString() + color.g.toString() + color.b.toString()

  			if (colorsHash[hash] !== undefined) {
  				return colorsHash[hash]
  			}

  			colorsHash[hash] = colors.length
  			colors.push(color.getHex())

  			return colorsHash[hash]
  		}

  		function getUvIndex (uv) {
  			var hash = uv.x.toString() + uv.y.toString()

  			if (uvsHash[hash] !== undefined) {
  				return uvsHash[hash]
  			}

  			uvsHash[hash] = uvs.length / 2
  			uvs.push(uv.x, uv.y)

  			return uvsHash[hash]
  		}

  		data.data = {}

  		data.data.vertices = vertices
  		data.data.normals = normals
  		if (colors.length > 0) data.data.colors = colors
  		if (uvs.length > 0) data.data.uvs = [uvs] // temporal backward compatibility
  		data.data.faces = faces

  		return data
  	},

  	clone: function () {
  		/*
  		 // Handle primitives

  		 var parameters = this.parameters;

  		 if ( parameters !== undefined ) {

  		 var values = [];

  		 for ( var key in parameters ) {

  		 values.push( parameters[ key ] );

  		 }

  		 var geometry = Object.create( this.constructor.prototype );
  		 this.constructor.apply( geometry, values );
  		 return geometry;

  		 }

  		 return new this.constructor().copy( this );
  		 */

  		return new Geometry().copy(this)
  	},

  	copy: function (source) {
  		var i, il, j, jl, k, kl

  		// reset

  		this.vertices = []
  		this.colors = []
  		this.faces = []
  		this.faceVertexUvs = [[]]
  		this.morphTargets = []
  		this.morphNormals = []
  		this.skinWeights = []
  		this.skinIndices = []
  		this.lineDistances = []
  		this.boundingBox = null
  		this.boundingSphere = null

  		// name

  		this.name = source.name

  		// vertices

  		var vertices = source.vertices

  		for (i = 0, il = vertices.length; i < il; i++) {
  			this.vertices.push(vertices[i].clone())
  		}

  		// colors

  		var colors = source.colors

  		for (i = 0, il = colors.length; i < il; i++) {
  			this.colors.push(colors[i].clone())
  		}

  		// faces

  		var faces = source.faces

  		for (i = 0, il = faces.length; i < il; i++) {
  			this.faces.push(faces[i].clone())
  		}

  		// face vertex uvs

  		for (i = 0, il = source.faceVertexUvs.length; i < il; i++) {
  			var faceVertexUvs = source.faceVertexUvs[i]

  			if (this.faceVertexUvs[i] === undefined) {
  				this.faceVertexUvs[i] = []
  			}

  			for (j = 0, jl = faceVertexUvs.length; j < jl; j++) {
  				var uvs = faceVertexUvs[j]; var uvsCopy = []

  				for (k = 0, kl = uvs.length; k < kl; k++) {
  					var uv = uvs[k]

  					uvsCopy.push(uv.clone())
  				}

  				this.faceVertexUvs[i].push(uvsCopy)
  			}
  		}

  		// morph targets

  		var morphTargets = source.morphTargets

  		for (i = 0, il = morphTargets.length; i < il; i++) {
  			var morphTarget = {}
  			morphTarget.name = morphTargets[i].name

  			// vertices

  			if (morphTargets[i].vertices !== undefined) {
  				morphTarget.vertices = []

  				for (j = 0, jl = morphTargets[i].vertices.length; j < jl; j++) {
  					morphTarget.vertices.push(morphTargets[i].vertices[j].clone())
  				}
  			}

  			// normals

  			if (morphTargets[i].normals !== undefined) {
  				morphTarget.normals = []

  				for (j = 0, jl = morphTargets[i].normals.length; j < jl; j++) {
  					morphTarget.normals.push(morphTargets[i].normals[j].clone())
  				}
  			}

  			this.morphTargets.push(morphTarget)
  		}

  		// morph normals

  		var morphNormals = source.morphNormals

  		for (i = 0, il = morphNormals.length; i < il; i++) {
  			var morphNormal = {}

  			// vertex normals

  			if (morphNormals[i].vertexNormals !== undefined) {
  				morphNormal.vertexNormals = []

  				for (j = 0, jl = morphNormals[i].vertexNormals.length; j < jl; j++) {
  					var srcVertexNormal = morphNormals[i].vertexNormals[j]
  					var destVertexNormal = {}

  					destVertexNormal.a = srcVertexNormal.a.clone()
  					destVertexNormal.b = srcVertexNormal.b.clone()
  					destVertexNormal.c = srcVertexNormal.c.clone()

  					morphNormal.vertexNormals.push(destVertexNormal)
  				}
  			}

  			// face normals

  			if (morphNormals[i].faceNormals !== undefined) {
  				morphNormal.faceNormals = []

  				for (j = 0, jl = morphNormals[i].faceNormals.length; j < jl; j++) {
  					morphNormal.faceNormals.push(morphNormals[i].faceNormals[j].clone())
  				}
  			}

  			this.morphNormals.push(morphNormal)
  		}

  		// skin weights

  		var skinWeights = source.skinWeights

  		for (i = 0, il = skinWeights.length; i < il; i++) {
  			this.skinWeights.push(skinWeights[i].clone())
  		}

  		// skin indices

  		var skinIndices = source.skinIndices

  		for (i = 0, il = skinIndices.length; i < il; i++) {
  			this.skinIndices.push(skinIndices[i].clone())
  		}

  		// line distances

  		var lineDistances = source.lineDistances

  		for (i = 0, il = lineDistances.length; i < il; i++) {
  			this.lineDistances.push(lineDistances[i])
  		}

  		// bounding box

  		var boundingBox = source.boundingBox

  		if (boundingBox !== null) {
  			this.boundingBox = boundingBox.clone()
  		}

  		// bounding sphere

  		var boundingSphere = source.boundingSphere

  		if (boundingSphere !== null) {
  			this.boundingSphere = boundingSphere.clone()
  		}

  		// update flags

  		this.elementsNeedUpdate = source.elementsNeedUpdate
  		this.verticesNeedUpdate = source.verticesNeedUpdate
  		this.uvsNeedUpdate = source.uvsNeedUpdate
  		this.normalsNeedUpdate = source.normalsNeedUpdate
  		this.colorsNeedUpdate = source.colorsNeedUpdate
  		this.lineDistancesNeedUpdate = source.lineDistancesNeedUpdate
  		this.groupsNeedUpdate = source.groupsNeedUpdate

  		return this
  	},

  	dispose: function () {
  		this.dispatchEvent({ type: 'dispose' })
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function BufferAttribute (array, itemSize, normalized) {
  	if (Array.isArray(array)) {
  		throw new TypeError('THREE.BufferAttribute: array should be a Typed Array.')
  	}

  	this.name = ''

  	this.array = array
  	this.itemSize = itemSize
  	this.count = array !== undefined ? array.length / itemSize : 0
  	this.normalized = normalized === true

  	this.dynamic = false
  	this.updateRange = { offset: 0, count: -1 }

  	this.version = 0
  }

  Object.defineProperty(BufferAttribute.prototype, 'needsUpdate', {

  	set: function (value) {
  		if (value === true) this.version++
  	}

  })

  Object.assign(BufferAttribute.prototype, {

  	isBufferAttribute: true,

  	onUploadCallback: function () {},

  	setArray: function (array) {
  		if (Array.isArray(array)) {
  			throw new TypeError('THREE.BufferAttribute: array should be a Typed Array.')
  		}

  		this.count = array !== undefined ? array.length / this.itemSize : 0
  		this.array = array

  		return this
  	},

  	setDynamic: function (value) {
  		this.dynamic = value

  		return this
  	},

  	copy: function (source) {
  		this.name = source.name
  		this.array = new source.array.constructor(source.array)
  		this.itemSize = source.itemSize
  		this.count = source.count
  		this.normalized = source.normalized

  		this.dynamic = source.dynamic

  		return this
  	},

  	copyAt: function (index1, attribute, index2) {
  		index1 *= this.itemSize
  		index2 *= attribute.itemSize

  		for (var i = 0, l = this.itemSize; i < l; i++) {
  			this.array[index1 + i] = attribute.array[index2 + i]
  		}

  		return this
  	},

  	copyArray: function (array) {
  		this.array.set(array)

  		return this
  	},

  	copyColorsArray: function (colors) {
  		var array = this.array; var offset = 0

  		for (var i = 0, l = colors.length; i < l; i++) {
  			var color = colors[i]

  			if (color === undefined) {
  				console.warn('THREE.BufferAttribute.copyColorsArray(): color is undefined', i)
  				color = new Color()
  			}

  			array[offset++] = color.r
  			array[offset++] = color.g
  			array[offset++] = color.b
  		}

  		return this
  	},

  	copyVector2sArray: function (vectors) {
  		var array = this.array; var offset = 0

  		for (var i = 0, l = vectors.length; i < l; i++) {
  			var vector = vectors[i]

  			if (vector === undefined) {
  				console.warn('THREE.BufferAttribute.copyVector2sArray(): vector is undefined', i)
  				vector = new Vector2()
  			}

  			array[offset++] = vector.x
  			array[offset++] = vector.y
  		}

  		return this
  	},

  	copyVector3sArray: function (vectors) {
  		var array = this.array; var offset = 0

  		for (var i = 0, l = vectors.length; i < l; i++) {
  			var vector = vectors[i]

  			if (vector === undefined) {
  				console.warn('THREE.BufferAttribute.copyVector3sArray(): vector is undefined', i)
  				vector = new Vector3()
  			}

  			array[offset++] = vector.x
  			array[offset++] = vector.y
  			array[offset++] = vector.z
  		}

  		return this
  	},

  	copyVector4sArray: function (vectors) {
  		var array = this.array; var offset = 0

  		for (var i = 0, l = vectors.length; i < l; i++) {
  			var vector = vectors[i]

  			if (vector === undefined) {
  				console.warn('THREE.BufferAttribute.copyVector4sArray(): vector is undefined', i)
  				vector = new Vector4()
  			}

  			array[offset++] = vector.x
  			array[offset++] = vector.y
  			array[offset++] = vector.z
  			array[offset++] = vector.w
  		}

  		return this
  	},

  	set: function (value, offset) {
  		if (offset === undefined) offset = 0

  		this.array.set(value, offset)

  		return this
  	},

  	getX: function (index) {
  		return this.array[index * this.itemSize]
  	},

  	setX: function (index, x) {
  		this.array[index * this.itemSize] = x

  		return this
  	},

  	getY: function (index) {
  		return this.array[index * this.itemSize + 1]
  	},

  	setY: function (index, y) {
  		this.array[index * this.itemSize + 1] = y

  		return this
  	},

  	getZ: function (index) {
  		return this.array[index * this.itemSize + 2]
  	},

  	setZ: function (index, z) {
  		this.array[index * this.itemSize + 2] = z

  		return this
  	},

  	getW: function (index) {
  		return this.array[index * this.itemSize + 3]
  	},

  	setW: function (index, w) {
  		this.array[index * this.itemSize + 3] = w

  		return this
  	},

  	setXY: function (index, x, y) {
  		index *= this.itemSize

  		this.array[index + 0] = x
  		this.array[index + 1] = y

  		return this
  	},

  	setXYZ: function (index, x, y, z) {
  		index *= this.itemSize

  		this.array[index + 0] = x
  		this.array[index + 1] = y
  		this.array[index + 2] = z

  		return this
  	},

  	setXYZW: function (index, x, y, z, w) {
  		index *= this.itemSize

  		this.array[index + 0] = x
  		this.array[index + 1] = y
  		this.array[index + 2] = z
  		this.array[index + 3] = w

  		return this
  	},

  	onUpload: function (callback) {
  		this.onUploadCallback = callback

  		return this
  	},

  	clone: function () {
  		return new this.constructor(this.array, this.itemSize).copy(this)
  	}

  })

  //

  function Int8BufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Int8Array(array), itemSize, normalized)
  }

  Int8BufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Int8BufferAttribute.prototype.constructor = Int8BufferAttribute

  function Uint8BufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Uint8Array(array), itemSize, normalized)
  }

  Uint8BufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Uint8BufferAttribute.prototype.constructor = Uint8BufferAttribute

  function Uint8ClampedBufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Uint8ClampedArray(array), itemSize, normalized)
  }

  Uint8ClampedBufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Uint8ClampedBufferAttribute.prototype.constructor = Uint8ClampedBufferAttribute

  function Int16BufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Int16Array(array), itemSize, normalized)
  }

  Int16BufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Int16BufferAttribute.prototype.constructor = Int16BufferAttribute

  function Uint16BufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Uint16Array(array), itemSize, normalized)
  }

  Uint16BufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Uint16BufferAttribute.prototype.constructor = Uint16BufferAttribute

  function Int32BufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Int32Array(array), itemSize, normalized)
  }

  Int32BufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Int32BufferAttribute.prototype.constructor = Int32BufferAttribute

  function Uint32BufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Uint32Array(array), itemSize, normalized)
  }

  Uint32BufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Uint32BufferAttribute.prototype.constructor = Uint32BufferAttribute

  function Float32BufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Float32Array(array), itemSize, normalized)
  }

  Float32BufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Float32BufferAttribute.prototype.constructor = Float32BufferAttribute

  function Float64BufferAttribute (array, itemSize, normalized) {
  	BufferAttribute.call(this, new Float64Array(array), itemSize, normalized)
  }

  Float64BufferAttribute.prototype = Object.create(BufferAttribute.prototype)
  Float64BufferAttribute.prototype.constructor = Float64BufferAttribute

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function DirectGeometry () {
  	this.vertices = []
  	this.normals = []
  	this.colors = []
  	this.uvs = []
  	this.uvs2 = []

  	this.groups = []

  	this.morphTargets = {}

  	this.skinWeights = []
  	this.skinIndices = []

  	// this.lineDistances = [];

  	this.boundingBox = null
  	this.boundingSphere = null

  	// update flags

  	this.verticesNeedUpdate = false
  	this.normalsNeedUpdate = false
  	this.colorsNeedUpdate = false
  	this.uvsNeedUpdate = false
  	this.groupsNeedUpdate = false
  }

  Object.assign(DirectGeometry.prototype, {

  	computeGroups: function (geometry) {
  		var group
  		var groups = []
  		var materialIndex = undefined

  		var faces = geometry.faces

  		for (var i = 0; i < faces.length; i++) {
  			var face = faces[i]

  			// materials

  			if (face.materialIndex !== materialIndex) {
  				materialIndex = face.materialIndex

  				if (group !== undefined) {
  					group.count = (i * 3) - group.start
  					groups.push(group)
  				}

  				group = {
  					start: i * 3,
  					materialIndex: materialIndex
  				}
  			}
  		}

  		if (group !== undefined) {
  			group.count = (i * 3) - group.start
  			groups.push(group)
  		}

  		this.groups = groups
  	},

  	fromGeometry: function (geometry) {
  		var faces = geometry.faces
  		var vertices = geometry.vertices
  		var faceVertexUvs = geometry.faceVertexUvs

  		var hasFaceVertexUv = faceVertexUvs[0] && faceVertexUvs[0].length > 0
  		var hasFaceVertexUv2 = faceVertexUvs[1] && faceVertexUvs[1].length > 0

  		// morphs

  		var morphTargets = geometry.morphTargets
  		var morphTargetsLength = morphTargets.length

  		var morphTargetsPosition

  		if (morphTargetsLength > 0) {
  			morphTargetsPosition = []

  			for (var i = 0; i < morphTargetsLength; i++) {
  				morphTargetsPosition[i] = []
  			}

  			this.morphTargets.position = morphTargetsPosition
  		}

  		var morphNormals = geometry.morphNormals
  		var morphNormalsLength = morphNormals.length

  		var morphTargetsNormal

  		if (morphNormalsLength > 0) {
  			morphTargetsNormal = []

  			for (var i = 0; i < morphNormalsLength; i++) {
  				morphTargetsNormal[i] = []
  			}

  			this.morphTargets.normal = morphTargetsNormal
  		}

  		// skins

  		var skinIndices = geometry.skinIndices
  		var skinWeights = geometry.skinWeights

  		var hasSkinIndices = skinIndices.length === vertices.length
  		var hasSkinWeights = skinWeights.length === vertices.length

  		//

  		if (faces.length === 0) {
  			console.error('THREE.DirectGeometry: Faceless geometries are not supported.')
  		}

  		for (var i = 0; i < faces.length; i++) {
  			var face = faces[i]

  			this.vertices.push(vertices[face.a], vertices[face.b], vertices[face.c])

  			var vertexNormals = face.vertexNormals

  			if (vertexNormals.length === 3) {
  				this.normals.push(vertexNormals[0], vertexNormals[1], vertexNormals[2])
  			} else {
  				var normal = face.normal

  				this.normals.push(normal, normal, normal)
  			}

  			var vertexColors = face.vertexColors

  			if (vertexColors.length === 3) {
  				this.colors.push(vertexColors[0], vertexColors[1], vertexColors[2])
  			} else {
  				var color = face.color

  				this.colors.push(color, color, color)
  			}

  			if (hasFaceVertexUv === true) {
  				var vertexUvs = faceVertexUvs[0][i]

  				if (vertexUvs !== undefined) {
  					this.uvs.push(vertexUvs[0], vertexUvs[1], vertexUvs[2])
  				} else {
  					console.warn('THREE.DirectGeometry.fromGeometry(): Undefined vertexUv ', i)

  					this.uvs.push(new Vector2(), new Vector2(), new Vector2())
  				}
  			}

  			if (hasFaceVertexUv2 === true) {
  				var vertexUvs = faceVertexUvs[1][i]

  				if (vertexUvs !== undefined) {
  					this.uvs2.push(vertexUvs[0], vertexUvs[1], vertexUvs[2])
  				} else {
  					console.warn('THREE.DirectGeometry.fromGeometry(): Undefined vertexUv2 ', i)

  					this.uvs2.push(new Vector2(), new Vector2(), new Vector2())
  				}
  			}

  			// morphs

  			for (var j = 0; j < morphTargetsLength; j++) {
  				var morphTarget = morphTargets[j].vertices

  				morphTargetsPosition[j].push(morphTarget[face.a], morphTarget[face.b], morphTarget[face.c])
  			}

  			for (var j = 0; j < morphNormalsLength; j++) {
  				var morphNormal = morphNormals[j].vertexNormals[i]

  				morphTargetsNormal[j].push(morphNormal.a, morphNormal.b, morphNormal.c)
  			}

  			// skins

  			if (hasSkinIndices) {
  				this.skinIndices.push(skinIndices[face.a], skinIndices[face.b], skinIndices[face.c])
  			}

  			if (hasSkinWeights) {
  				this.skinWeights.push(skinWeights[face.a], skinWeights[face.b], skinWeights[face.c])
  			}
  		}

  		this.computeGroups(geometry)

  		this.verticesNeedUpdate = geometry.verticesNeedUpdate
  		this.normalsNeedUpdate = geometry.normalsNeedUpdate
  		this.colorsNeedUpdate = geometry.colorsNeedUpdate
  		this.uvsNeedUpdate = geometry.uvsNeedUpdate
  		this.groupsNeedUpdate = geometry.groupsNeedUpdate

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function arrayMax (array) {
  	if (array.length === 0) return -Infinity

  	var max = array[0]

  	for (var i = 1, l = array.length; i < l; ++i) {
  		if (array[i] > max) max = array[i]
  	}

  	return max
  }

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   */

  var bufferGeometryId = 1 // BufferGeometry uses odd numbers as Id

  function BufferGeometry () {
  	Object.defineProperty(this, 'id', { value: bufferGeometryId += 2 })

  	this.uuid = _Math.generateUUID()

  	this.name = ''
  	this.type = 'BufferGeometry'

  	this.index = null
  	this.attributes = {}

  	this.morphAttributes = {}

  	this.groups = []

  	this.boundingBox = null
  	this.boundingSphere = null

  	this.drawRange = { start: 0, count: Infinity }

  	this.userData = {}
  }

  BufferGeometry.prototype = Object.assign(Object.create(EventDispatcher.prototype), {

  	constructor: BufferGeometry,

  	isBufferGeometry: true,

  	getIndex: function () {
  		return this.index
  	},

  	setIndex: function (index) {
  		if (Array.isArray(index)) {
  			this.index = new (arrayMax(index) > 65535 ? Uint32BufferAttribute : Uint16BufferAttribute)(index, 1)
  		} else {
  			this.index = index
  		}
  	},

  	addAttribute: function (name, attribute) {
  		if (!(attribute && attribute.isBufferAttribute) && !(attribute && attribute.isInterleavedBufferAttribute)) {
  			console.warn('THREE.BufferGeometry: .addAttribute() now expects ( name, attribute ).')

  			return this.addAttribute(name, new BufferAttribute(arguments[1], arguments[2]))
  		}

  		if (name === 'index') {
  			console.warn('THREE.BufferGeometry.addAttribute: Use .setIndex() for index attribute.')
  			this.setIndex(attribute)

  			return this
  		}

  		this.attributes[name] = attribute

  		return this
  	},

  	getAttribute: function (name) {
  		return this.attributes[name]
  	},

  	removeAttribute: function (name) {
  		delete this.attributes[name]

  		return this
  	},

  	addGroup: function (start, count, materialIndex) {
  		this.groups.push({

  			start: start,
  			count: count,
  			materialIndex: materialIndex !== undefined ? materialIndex : 0

  		})
  	},

  	clearGroups: function () {
  		this.groups = []
  	},

  	setDrawRange: function (start, count) {
  		this.drawRange.start = start
  		this.drawRange.count = count
  	},

  	applyMatrix: function (matrix) {
  		var position = this.attributes.position

  		if (position !== undefined) {
  			matrix.applyToBufferAttribute(position)
  			position.needsUpdate = true
  		}

  		var normal = this.attributes.normal

  		if (normal !== undefined) {
  			var normalMatrix = new Matrix3().getNormalMatrix(matrix)

  			normalMatrix.applyToBufferAttribute(normal)
  			normal.needsUpdate = true
  		}

  		if (this.boundingBox !== null) {
  			this.computeBoundingBox()
  		}

  		if (this.boundingSphere !== null) {
  			this.computeBoundingSphere()
  		}

  		return this
  	},

  	rotateX: (function () {
  		// rotate geometry around world x-axis

  		var m1 = new Matrix4()

  		return function rotateX (angle) {
  			m1.makeRotationX(angle)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	rotateY: (function () {
  		// rotate geometry around world y-axis

  		var m1 = new Matrix4()

  		return function rotateY (angle) {
  			m1.makeRotationY(angle)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	rotateZ: (function () {
  		// rotate geometry around world z-axis

  		var m1 = new Matrix4()

  		return function rotateZ (angle) {
  			m1.makeRotationZ(angle)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	translate: (function () {
  		// translate geometry

  		var m1 = new Matrix4()

  		return function translate (x, y, z) {
  			m1.makeTranslation(x, y, z)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	scale: (function () {
  		// scale geometry

  		var m1 = new Matrix4()

  		return function scale (x, y, z) {
  			m1.makeScale(x, y, z)

  			this.applyMatrix(m1)

  			return this
  		}
  	}()),

  	lookAt: (function () {
  		var obj = new Object3D()

  		return function lookAt (vector) {
  			obj.lookAt(vector)

  			obj.updateMatrix()

  			this.applyMatrix(obj.matrix)
  		}
  	}()),

  	center: (function () {
  		var offset = new Vector3()

  		return function center () {
  			this.computeBoundingBox()

  			this.boundingBox.getCenter(offset).negate()

  			this.translate(offset.x, offset.y, offset.z)

  			return this
  		}
  	}()),

  	setFromObject: function (object) {
  		// console.log( 'THREE.BufferGeometry.setFromObject(). Converting', object, this );

  		var geometry = object.geometry

  		if (object.isPoints || object.isLine) {
  			var positions = new Float32BufferAttribute(geometry.vertices.length * 3, 3)
  			var colors = new Float32BufferAttribute(geometry.colors.length * 3, 3)

  			this.addAttribute('position', positions.copyVector3sArray(geometry.vertices))
  			this.addAttribute('color', colors.copyColorsArray(geometry.colors))

  			if (geometry.lineDistances && geometry.lineDistances.length === geometry.vertices.length) {
  				var lineDistances = new Float32BufferAttribute(geometry.lineDistances.length, 1)

  				this.addAttribute('lineDistance', lineDistances.copyArray(geometry.lineDistances))
  			}

  			if (geometry.boundingSphere !== null) {
  				this.boundingSphere = geometry.boundingSphere.clone()
  			}

  			if (geometry.boundingBox !== null) {
  				this.boundingBox = geometry.boundingBox.clone()
  			}
  		} else if (object.isMesh) {
  			if (geometry && geometry.isGeometry) {
  				this.fromGeometry(geometry)
  			}
  		}

  		return this
  	},

  	setFromPoints: function (points) {
  		var position = []

  		for (var i = 0, l = points.length; i < l; i++) {
  			var point = points[i]
  			position.push(point.x, point.y, point.z || 0)
  		}

  		this.addAttribute('position', new Float32BufferAttribute(position, 3))

  		return this
  	},

  	updateFromObject: function (object) {
  		var geometry = object.geometry

  		if (object.isMesh) {
  			var direct = geometry.__directGeometry

  			if (geometry.elementsNeedUpdate === true) {
  				direct = undefined
  				geometry.elementsNeedUpdate = false
  			}

  			if (direct === undefined) {
  				return this.fromGeometry(geometry)
  			}

  			direct.verticesNeedUpdate = geometry.verticesNeedUpdate
  			direct.normalsNeedUpdate = geometry.normalsNeedUpdate
  			direct.colorsNeedUpdate = geometry.colorsNeedUpdate
  			direct.uvsNeedUpdate = geometry.uvsNeedUpdate
  			direct.groupsNeedUpdate = geometry.groupsNeedUpdate

  			geometry.verticesNeedUpdate = false
  			geometry.normalsNeedUpdate = false
  			geometry.colorsNeedUpdate = false
  			geometry.uvsNeedUpdate = false
  			geometry.groupsNeedUpdate = false

  			geometry = direct
  		}

  		var attribute

  		if (geometry.verticesNeedUpdate === true) {
  			attribute = this.attributes.position

  			if (attribute !== undefined) {
  				attribute.copyVector3sArray(geometry.vertices)
  				attribute.needsUpdate = true
  			}

  			geometry.verticesNeedUpdate = false
  		}

  		if (geometry.normalsNeedUpdate === true) {
  			attribute = this.attributes.normal

  			if (attribute !== undefined) {
  				attribute.copyVector3sArray(geometry.normals)
  				attribute.needsUpdate = true
  			}

  			geometry.normalsNeedUpdate = false
  		}

  		if (geometry.colorsNeedUpdate === true) {
  			attribute = this.attributes.color

  			if (attribute !== undefined) {
  				attribute.copyColorsArray(geometry.colors)
  				attribute.needsUpdate = true
  			}

  			geometry.colorsNeedUpdate = false
  		}

  		if (geometry.uvsNeedUpdate) {
  			attribute = this.attributes.uv

  			if (attribute !== undefined) {
  				attribute.copyVector2sArray(geometry.uvs)
  				attribute.needsUpdate = true
  			}

  			geometry.uvsNeedUpdate = false
  		}

  		if (geometry.lineDistancesNeedUpdate) {
  			attribute = this.attributes.lineDistance

  			if (attribute !== undefined) {
  				attribute.copyArray(geometry.lineDistances)
  				attribute.needsUpdate = true
  			}

  			geometry.lineDistancesNeedUpdate = false
  		}

  		if (geometry.groupsNeedUpdate) {
  			geometry.computeGroups(object.geometry)
  			this.groups = geometry.groups

  			geometry.groupsNeedUpdate = false
  		}

  		return this
  	},

  	fromGeometry: function (geometry) {
  		geometry.__directGeometry = new DirectGeometry().fromGeometry(geometry)

  		return this.fromDirectGeometry(geometry.__directGeometry)
  	},

  	fromDirectGeometry: function (geometry) {
  		var positions = new Float32Array(geometry.vertices.length * 3)
  		this.addAttribute('position', new BufferAttribute(positions, 3).copyVector3sArray(geometry.vertices))

  		if (geometry.normals.length > 0) {
  			var normals = new Float32Array(geometry.normals.length * 3)
  			this.addAttribute('normal', new BufferAttribute(normals, 3).copyVector3sArray(geometry.normals))
  		}

  		if (geometry.colors.length > 0) {
  			var colors = new Float32Array(geometry.colors.length * 3)
  			this.addAttribute('color', new BufferAttribute(colors, 3).copyColorsArray(geometry.colors))
  		}

  		if (geometry.uvs.length > 0) {
  			var uvs = new Float32Array(geometry.uvs.length * 2)
  			this.addAttribute('uv', new BufferAttribute(uvs, 2).copyVector2sArray(geometry.uvs))
  		}

  		if (geometry.uvs2.length > 0) {
  			var uvs2 = new Float32Array(geometry.uvs2.length * 2)
  			this.addAttribute('uv2', new BufferAttribute(uvs2, 2).copyVector2sArray(geometry.uvs2))
  		}

  		// groups

  		this.groups = geometry.groups

  		// morphs

  		for (var name in geometry.morphTargets) {
  			var array = []
  			var morphTargets = geometry.morphTargets[name]

  			for (var i = 0, l = morphTargets.length; i < l; i++) {
  				var morphTarget = morphTargets[i]

  				var attribute = new Float32BufferAttribute(morphTarget.length * 3, 3)

  				array.push(attribute.copyVector3sArray(morphTarget))
  			}

  			this.morphAttributes[name] = array
  		}

  		// skinning

  		if (geometry.skinIndices.length > 0) {
  			var skinIndices = new Float32BufferAttribute(geometry.skinIndices.length * 4, 4)
  			this.addAttribute('skinIndex', skinIndices.copyVector4sArray(geometry.skinIndices))
  		}

  		if (geometry.skinWeights.length > 0) {
  			var skinWeights = new Float32BufferAttribute(geometry.skinWeights.length * 4, 4)
  			this.addAttribute('skinWeight', skinWeights.copyVector4sArray(geometry.skinWeights))
  		}

  		//

  		if (geometry.boundingSphere !== null) {
  			this.boundingSphere = geometry.boundingSphere.clone()
  		}

  		if (geometry.boundingBox !== null) {
  			this.boundingBox = geometry.boundingBox.clone()
  		}

  		return this
  	},

  	computeBoundingBox: function () {
  		if (this.boundingBox === null) {
  			this.boundingBox = new Box3()
  		}

  		var position = this.attributes.position

  		if (position !== undefined) {
  			this.boundingBox.setFromBufferAttribute(position)
  		} else {
  			this.boundingBox.makeEmpty()
  		}

  		if (isNaN(this.boundingBox.min.x) || isNaN(this.boundingBox.min.y) || isNaN(this.boundingBox.min.z)) {
  			console.error('THREE.BufferGeometry.computeBoundingBox: Computed min/max have NaN values. The "position" attribute is likely to have NaN values.', this)
  		}
  	},

  	computeBoundingSphere: (function () {
  		var box = new Box3()
  		var vector = new Vector3()

  		return function computeBoundingSphere () {
  			if (this.boundingSphere === null) {
  				this.boundingSphere = new Sphere()
  			}

  			var position = this.attributes.position

  			if (position) {
  				var center = this.boundingSphere.center

  				box.setFromBufferAttribute(position)
  				box.getCenter(center)

  				// hoping to find a boundingSphere with a radius smaller than the
  				// boundingSphere of the boundingBox: sqrt(3) smaller in the best case

  				var maxRadiusSq = 0

  				for (var i = 0, il = position.count; i < il; i++) {
  					vector.x = position.getX(i)
  					vector.y = position.getY(i)
  					vector.z = position.getZ(i)
  					maxRadiusSq = Math.max(maxRadiusSq, center.distanceToSquared(vector))
  				}

  				this.boundingSphere.radius = Math.sqrt(maxRadiusSq)

  				if (isNaN(this.boundingSphere.radius)) {
  					console.error('THREE.BufferGeometry.computeBoundingSphere(): Computed radius is NaN. The "position" attribute is likely to have NaN values.', this)
  				}
  			}
  		}
  	}()),

  	computeFaceNormals: function () {

  		// backwards compatibility

  	},

  	computeVertexNormals: function () {
  		var index = this.index
  		var attributes = this.attributes
  		var groups = this.groups

  		if (attributes.position) {
  			var positions = attributes.position.array

  			if (attributes.normal === undefined) {
  				this.addAttribute('normal', new BufferAttribute(new Float32Array(positions.length), 3))
  			} else {
  				// reset existing normals to zero

  				var array = attributes.normal.array

  				for (var i = 0, il = array.length; i < il; i++) {
  					array[i] = 0
  				}
  			}

  			var normals = attributes.normal.array

  			var vA, vB, vC
  			var pA = new Vector3(); var pB = new Vector3(); var pC = new Vector3()
  			var cb = new Vector3(); var ab = new Vector3()

  			// indexed elements

  			if (index) {
  				var indices = index.array

  				if (groups.length === 0) {
  					this.addGroup(0, indices.length)
  				}

  				for (var j = 0, jl = groups.length; j < jl; ++j) {
  					var group = groups[j]

  					var start = group.start
  					var count = group.count

  					for (var i = start, il = start + count; i < il; i += 3) {
  						vA = indices[i + 0] * 3
  						vB = indices[i + 1] * 3
  						vC = indices[i + 2] * 3

  						pA.fromArray(positions, vA)
  						pB.fromArray(positions, vB)
  						pC.fromArray(positions, vC)

  						cb.subVectors(pC, pB)
  						ab.subVectors(pA, pB)
  						cb.cross(ab)

  						normals[vA] += cb.x
  						normals[vA + 1] += cb.y
  						normals[vA + 2] += cb.z

  						normals[vB] += cb.x
  						normals[vB + 1] += cb.y
  						normals[vB + 2] += cb.z

  						normals[vC] += cb.x
  						normals[vC + 1] += cb.y
  						normals[vC + 2] += cb.z
  					}
  				}
  			} else {
  				// non-indexed elements (unconnected triangle soup)

  				for (var i = 0, il = positions.length; i < il; i += 9) {
  					pA.fromArray(positions, i)
  					pB.fromArray(positions, i + 3)
  					pC.fromArray(positions, i + 6)

  					cb.subVectors(pC, pB)
  					ab.subVectors(pA, pB)
  					cb.cross(ab)

  					normals[i] = cb.x
  					normals[i + 1] = cb.y
  					normals[i + 2] = cb.z

  					normals[i + 3] = cb.x
  					normals[i + 4] = cb.y
  					normals[i + 5] = cb.z

  					normals[i + 6] = cb.x
  					normals[i + 7] = cb.y
  					normals[i + 8] = cb.z
  				}
  			}

  			this.normalizeNormals()

  			attributes.normal.needsUpdate = true
  		}
  	},

  	merge: function (geometry, offset) {
  		if (!(geometry && geometry.isBufferGeometry)) {
  			console.error('THREE.BufferGeometry.merge(): geometry not an instance of THREE.BufferGeometry.', geometry)
  			return
  		}

  		if (offset === undefined) {
  			offset = 0

  			console.warn(
  				'THREE.BufferGeometry.merge(): Overwriting original geometry, starting at offset=0. ' +
  				'Use BufferGeometryUtils.mergeBufferGeometries() for lossless merge.'
  			)
  		}

  		var attributes = this.attributes

  		for (var key in attributes) {
  			if (geometry.attributes[key] === undefined) continue

  			var attribute1 = attributes[key]
  			var attributeArray1 = attribute1.array

  			var attribute2 = geometry.attributes[key]
  			var attributeArray2 = attribute2.array

  			var attributeSize = attribute2.itemSize

  			for (var i = 0, j = attributeSize * offset; i < attributeArray2.length; i++, j++) {
  				attributeArray1[j] = attributeArray2[i]
  			}
  		}

  		return this
  	},

  	normalizeNormals: (function () {
  		var vector = new Vector3()

  		return function normalizeNormals () {
  			var normals = this.attributes.normal

  			for (var i = 0, il = normals.count; i < il; i++) {
  				vector.x = normals.getX(i)
  				vector.y = normals.getY(i)
  				vector.z = normals.getZ(i)

  				vector.normalize()

  				normals.setXYZ(i, vector.x, vector.y, vector.z)
  			}
  		}
  	}()),

  	toNonIndexed: function () {
  		if (this.index === null) {
  			console.warn('THREE.BufferGeometry.toNonIndexed(): Geometry is already non-indexed.')
  			return this
  		}

  		var geometry2 = new BufferGeometry()

  		var indices = this.index.array
  		var attributes = this.attributes

  		for (var name in attributes) {
  			var attribute = attributes[name]

  			var array = attribute.array
  			var itemSize = attribute.itemSize

  			var array2 = new array.constructor(indices.length * itemSize)

  			var index = 0; var index2 = 0

  			for (var i = 0, l = indices.length; i < l; i++) {
  				index = indices[i] * itemSize

  				for (var j = 0; j < itemSize; j++) {
  					array2[index2++] = array[index++]
  				}
  			}

  			geometry2.addAttribute(name, new BufferAttribute(array2, itemSize))
  		}

  		var groups = this.groups

  		for (var i = 0, l = groups.length; i < l; i++) {
  			var group = groups[i]
  			geometry2.addGroup(group.start, group.count, group.materialIndex)
  		}

  		return geometry2
  	},

  	toJSON: function () {
  		var data = {
  			metadata: {
  				version: 4.5,
  				type: 'BufferGeometry',
  				generator: 'BufferGeometry.toJSON'
  			}
  		}

  		// standard BufferGeometry serialization

  		data.uuid = this.uuid
  		data.type = this.type
  		if (this.name !== '') data.name = this.name
  		if (Object.keys(this.userData).length > 0) data.userData = this.userData

  		if (this.parameters !== undefined) {
  			var parameters = this.parameters

  			for (var key in parameters) {
  				if (parameters[key] !== undefined) data[key] = parameters[key]
  			}

  			return data
  		}

  		data.data = { attributes: {} }

  		var index = this.index

  		if (index !== null) {
  			var array = Array.prototype.slice.call(index.array)

  			data.data.index = {
  				type: index.array.constructor.name,
  				array: array
  			}
  		}

  		var attributes = this.attributes

  		for (var key in attributes) {
  			var attribute = attributes[key]

  			var array = Array.prototype.slice.call(attribute.array)

  			data.data.attributes[key] = {
  				itemSize: attribute.itemSize,
  				type: attribute.array.constructor.name,
  				array: array,
  				normalized: attribute.normalized
  			}
  		}

  		var groups = this.groups

  		if (groups.length > 0) {
  			data.data.groups = JSON.parse(JSON.stringify(groups))
  		}

  		var boundingSphere = this.boundingSphere

  		if (boundingSphere !== null) {
  			data.data.boundingSphere = {
  				center: boundingSphere.center.toArray(),
  				radius: boundingSphere.radius
  			}
  		}

  		return data
  	},

  	clone: function () {
  		/*
  		 // Handle primitives

  		 var parameters = this.parameters;

  		 if ( parameters !== undefined ) {

  		 var values = [];

  		 for ( var key in parameters ) {

  		 values.push( parameters[ key ] );

  		 }

  		 var geometry = Object.create( this.constructor.prototype );
  		 this.constructor.apply( geometry, values );
  		 return geometry;

  		 }

  		 return new this.constructor().copy( this );
  		 */

  		return new BufferGeometry().copy(this)
  	},

  	copy: function (source) {
  		var name, i, l

  		// reset

  		this.index = null
  		this.attributes = {}
  		this.morphAttributes = {}
  		this.groups = []
  		this.boundingBox = null
  		this.boundingSphere = null

  		// name

  		this.name = source.name

  		// index

  		var index = source.index

  		if (index !== null) {
  			this.setIndex(index.clone())
  		}

  		// attributes

  		var attributes = source.attributes

  		for (name in attributes) {
  			var attribute = attributes[name]
  			this.addAttribute(name, attribute.clone())
  		}

  		// morph attributes

  		var morphAttributes = source.morphAttributes

  		for (name in morphAttributes) {
  			var array = []
  			var morphAttribute = morphAttributes[name] // morphAttribute: array of Float32BufferAttributes

  			for (i = 0, l = morphAttribute.length; i < l; i++) {
  				array.push(morphAttribute[i].clone())
  			}

  			this.morphAttributes[name] = array
  		}

  		// groups

  		var groups = source.groups

  		for (i = 0, l = groups.length; i < l; i++) {
  			var group = groups[i]
  			this.addGroup(group.start, group.count, group.materialIndex)
  		}

  		// bounding box

  		var boundingBox = source.boundingBox

  		if (boundingBox !== null) {
  			this.boundingBox = boundingBox.clone()
  		}

  		// bounding sphere

  		var boundingSphere = source.boundingSphere

  		if (boundingSphere !== null) {
  			this.boundingSphere = boundingSphere.clone()
  		}

  		// draw range

  		this.drawRange.start = source.drawRange.start
  		this.drawRange.count = source.drawRange.count

  		// user data

  		this.userData = source.userData

  		return this
  	},

  	dispose: function () {
  		this.dispatchEvent({ type: 'dispose' })
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author Mugen87 / https://github.com/Mugen87
   */

  // BoxGeometry

  function BoxGeometry (width, height, depth, widthSegments, heightSegments, depthSegments) {
  	Geometry.call(this)

  	this.type = 'BoxGeometry'

  	this.parameters = {
  		width: width,
  		height: height,
  		depth: depth,
  		widthSegments: widthSegments,
  		heightSegments: heightSegments,
  		depthSegments: depthSegments
  	}

  	this.fromBufferGeometry(new BoxBufferGeometry(width, height, depth, widthSegments, heightSegments, depthSegments))
  	this.mergeVertices()
  }

  BoxGeometry.prototype = Object.create(Geometry.prototype)
  BoxGeometry.prototype.constructor = BoxGeometry

  // BoxBufferGeometry

  function BoxBufferGeometry (width, height, depth, widthSegments, heightSegments, depthSegments) {
  	BufferGeometry.call(this)

  	this.type = 'BoxBufferGeometry'

  	this.parameters = {
  		width: width,
  		height: height,
  		depth: depth,
  		widthSegments: widthSegments,
  		heightSegments: heightSegments,
  		depthSegments: depthSegments
  	}

  	var scope = this

  	width = width || 1
  	height = height || 1
  	depth = depth || 1

  	// segments

  	widthSegments = Math.floor(widthSegments) || 1
  	heightSegments = Math.floor(heightSegments) || 1
  	depthSegments = Math.floor(depthSegments) || 1

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// helper variables

  	var numberOfVertices = 0
  	var groupStart = 0

  	// build each side of the box geometry

  	buildPlane('z', 'y', 'x', -1, -1, depth, height, width, depthSegments, heightSegments, 0) // px
  	buildPlane('z', 'y', 'x', 1, -1, depth, height, -width, depthSegments, heightSegments, 1) // nx
  	buildPlane('x', 'z', 'y', 1, 1, width, depth, height, widthSegments, depthSegments, 2) // py
  	buildPlane('x', 'z', 'y', 1, -1, width, depth, -height, widthSegments, depthSegments, 3) // ny
  	buildPlane('x', 'y', 'z', 1, -1, width, height, depth, widthSegments, heightSegments, 4) // pz
  	buildPlane('x', 'y', 'z', -1, -1, width, height, -depth, widthSegments, heightSegments, 5) // nz

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))

  	function buildPlane (u, v, w, udir, vdir, width, height, depth, gridX, gridY, materialIndex) {
  		var segmentWidth = width / gridX
  		var segmentHeight = height / gridY

  		var widthHalf = width / 2
  		var heightHalf = height / 2
  		var depthHalf = depth / 2

  		var gridX1 = gridX + 1
  		var gridY1 = gridY + 1

  		var vertexCounter = 0
  		var groupCount = 0

  		var ix, iy

  		var vector = new Vector3()

  		// generate vertices, normals and uvs

  		for (iy = 0; iy < gridY1; iy++) {
  			var y = iy * segmentHeight - heightHalf

  			for (ix = 0; ix < gridX1; ix++) {
  				var x = ix * segmentWidth - widthHalf

  				// set values to correct vector component

  				vector[u] = x * udir
  				vector[v] = y * vdir
  				vector[w] = depthHalf

  				// now apply vector to vertex buffer

  				vertices.push(vector.x, vector.y, vector.z)

  				// set values to correct vector component

  				vector[u] = 0
  				vector[v] = 0
  				vector[w] = depth > 0 ? 1 : -1

  				// now apply vector to normal buffer

  				normals.push(vector.x, vector.y, vector.z)

  				// uvs

  				uvs.push(ix / gridX)
  				uvs.push(1 - (iy / gridY))

  				// counters

  				vertexCounter += 1
  			}
  		}

  		// indices

  		// 1. you need three indices to draw a single face
  		// 2. a single segment consists of two faces
  		// 3. so we need to generate six (2*3) indices per segment

  		for (iy = 0; iy < gridY; iy++) {
  			for (ix = 0; ix < gridX; ix++) {
  				var a = numberOfVertices + ix + gridX1 * iy
  				var b = numberOfVertices + ix + gridX1 * (iy + 1)
  				var c = numberOfVertices + (ix + 1) + gridX1 * (iy + 1)
  				var d = numberOfVertices + (ix + 1) + gridX1 * iy

  				// faces

  				indices.push(a, b, d)
  				indices.push(b, c, d)

  				// increase counter

  				groupCount += 6
  			}
  		}

  		// add a group to the geometry. this will ensure multi material support

  		scope.addGroup(groupStart, groupCount, materialIndex)

  		// calculate new start value for groups

  		groupStart += groupCount

  		// update total number of vertices

  		numberOfVertices += vertexCounter
  	}
  }

  BoxBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  BoxBufferGeometry.prototype.constructor = BoxBufferGeometry

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author Mugen87 / https://github.com/Mugen87
   */

  // PlaneGeometry

  function PlaneGeometry (width, height, widthSegments, heightSegments) {
  	Geometry.call(this)

  	this.type = 'PlaneGeometry'

  	this.parameters = {
  		width: width,
  		height: height,
  		widthSegments: widthSegments,
  		heightSegments: heightSegments
  	}

  	this.fromBufferGeometry(new PlaneBufferGeometry(width, height, widthSegments, heightSegments))
  	this.mergeVertices()
  }

  PlaneGeometry.prototype = Object.create(Geometry.prototype)
  PlaneGeometry.prototype.constructor = PlaneGeometry

  // PlaneBufferGeometry

  function PlaneBufferGeometry (width, height, widthSegments, heightSegments) {
  	BufferGeometry.call(this)

  	this.type = 'PlaneBufferGeometry'

  	this.parameters = {
  		width: width,
  		height: height,
  		widthSegments: widthSegments,
  		heightSegments: heightSegments
  	}

  	width = width || 1
  	height = height || 1

  	var width_half = width / 2
  	var height_half = height / 2

  	var gridX = Math.floor(widthSegments) || 1
  	var gridY = Math.floor(heightSegments) || 1

  	var gridX1 = gridX + 1
  	var gridY1 = gridY + 1

  	var segment_width = width / gridX
  	var segment_height = height / gridY

  	var ix, iy

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// generate vertices, normals and uvs

  	for (iy = 0; iy < gridY1; iy++) {
  		var y = iy * segment_height - height_half

  		for (ix = 0; ix < gridX1; ix++) {
  			var x = ix * segment_width - width_half

  			vertices.push(x, -y, 0)

  			normals.push(0, 0, 1)

  			uvs.push(ix / gridX)
  			uvs.push(1 - (iy / gridY))
  		}
  	}

  	// indices

  	for (iy = 0; iy < gridY; iy++) {
  		for (ix = 0; ix < gridX; ix++) {
  			var a = ix + gridX1 * iy
  			var b = ix + gridX1 * (iy + 1)
  			var c = (ix + 1) + gridX1 * (iy + 1)
  			var d = (ix + 1) + gridX1 * iy

  			// faces

  			indices.push(a, b, d)
  			indices.push(b, c, d)
  		}
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))
  }

  PlaneBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  PlaneBufferGeometry.prototype.constructor = PlaneBufferGeometry

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   */

  var materialId = 0

  function Material () {
  	Object.defineProperty(this, 'id', { value: materialId++ })

  	this.uuid = _Math.generateUUID()

  	this.name = ''
  	this.type = 'Material'

  	this.fog = true
  	this.lights = true

  	this.blending = NormalBlending
  	this.side = FrontSide
  	this.flatShading = false
  	this.vertexColors = NoColors // THREE.NoColors, THREE.VertexColors, THREE.FaceColors

  	this.opacity = 1
  	this.transparent = false

  	this.blendSrc = SrcAlphaFactor
  	this.blendDst = OneMinusSrcAlphaFactor
  	this.blendEquation = AddEquation
  	this.blendSrcAlpha = null
  	this.blendDstAlpha = null
  	this.blendEquationAlpha = null

  	this.depthFunc = LessEqualDepth
  	this.depthTest = true
  	this.depthWrite = true

  	this.clippingPlanes = null
  	this.clipIntersection = false
  	this.clipShadows = false

  	this.shadowSide = null

  	this.colorWrite = true

  	this.precision = null // override the renderer's default precision for this material

  	this.polygonOffset = false
  	this.polygonOffsetFactor = 0
  	this.polygonOffsetUnits = 0

  	this.dithering = false

  	this.alphaTest = 0
  	this.premultipliedAlpha = false

  	this.overdraw = 0 // Overdrawn pixels (typically between 0 and 1) for fixing antialiasing gaps in CanvasRenderer

  	this.visible = true

  	this.userData = {}

  	this.needsUpdate = true
  }

  Material.prototype = Object.assign(Object.create(EventDispatcher.prototype), {

  	constructor: Material,

  	isMaterial: true,

  	onBeforeCompile: function () {},

  	setValues: function (values) {
  		if (values === undefined) return

  		for (var key in values) {
  			var newValue = values[key]

  			if (newValue === undefined) {
  				console.warn("THREE.Material: '" + key + "' parameter is undefined.")
  				continue
  			}

  			// for backward compatability if shading is set in the constructor
  			if (key === 'shading') {
  				console.warn('THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.')
  				this.flatShading = (newValue === FlatShading)
  				continue
  			}

  			var currentValue = this[key]

  			if (currentValue === undefined) {
  				console.warn('THREE.' + this.type + ": '" + key + "' is not a property of this material.")
  				continue
  			}

  			if (currentValue && currentValue.isColor) {
  				currentValue.set(newValue)
  			} else if ((currentValue && currentValue.isVector3) && (newValue && newValue.isVector3)) {
  				currentValue.copy(newValue)
  			} else if (key === 'overdraw') {
  				// ensure overdraw is backwards-compatible with legacy boolean type
  				this[key] = Number(newValue)
  			} else {
  				this[key] = newValue
  			}
  		}
  	},

  	toJSON: function (meta) {
  		var isRoot = (meta === undefined || typeof meta === 'string')

  		if (isRoot) {
  			meta = {
  				textures: {},
  				images: {}
  			}
  		}

  		var data = {
  			metadata: {
  				version: 4.5,
  				type: 'Material',
  				generator: 'Material.toJSON'
  			}
  		}

  		// standard Material serialization
  		data.uuid = this.uuid
  		data.type = this.type

  		if (this.name !== '') data.name = this.name

  		if (this.color && this.color.isColor) data.color = this.color.getHex()

  		if (this.roughness !== undefined) data.roughness = this.roughness
  		if (this.metalness !== undefined) data.metalness = this.metalness

  		if (this.emissive && this.emissive.isColor) data.emissive = this.emissive.getHex()
  		if (this.emissiveIntensity !== 1) data.emissiveIntensity = this.emissiveIntensity

  		if (this.specular && this.specular.isColor) data.specular = this.specular.getHex()
  		if (this.shininess !== undefined) data.shininess = this.shininess
  		if (this.clearCoat !== undefined) data.clearCoat = this.clearCoat
  		if (this.clearCoatRoughness !== undefined) data.clearCoatRoughness = this.clearCoatRoughness

  		if (this.map && this.map.isTexture) data.map = this.map.toJSON(meta).uuid
  		if (this.alphaMap && this.alphaMap.isTexture) data.alphaMap = this.alphaMap.toJSON(meta).uuid
  		if (this.lightMap && this.lightMap.isTexture) data.lightMap = this.lightMap.toJSON(meta).uuid

  		if (this.aoMap && this.aoMap.isTexture) {
  			data.aoMap = this.aoMap.toJSON(meta).uuid
  			data.aoMapIntensity = this.aoMapIntensity
  		}

  		if (this.bumpMap && this.bumpMap.isTexture) {
  			data.bumpMap = this.bumpMap.toJSON(meta).uuid
  			data.bumpScale = this.bumpScale
  		}

  		if (this.normalMap && this.normalMap.isTexture) {
  			data.normalMap = this.normalMap.toJSON(meta).uuid
  			data.normalScale = this.normalScale.toArray()
  		}

  		if (this.displacementMap && this.displacementMap.isTexture) {
  			data.displacementMap = this.displacementMap.toJSON(meta).uuid
  			data.displacementScale = this.displacementScale
  			data.displacementBias = this.displacementBias
  		}

  		if (this.roughnessMap && this.roughnessMap.isTexture) data.roughnessMap = this.roughnessMap.toJSON(meta).uuid
  		if (this.metalnessMap && this.metalnessMap.isTexture) data.metalnessMap = this.metalnessMap.toJSON(meta).uuid

  		if (this.emissiveMap && this.emissiveMap.isTexture) data.emissiveMap = this.emissiveMap.toJSON(meta).uuid
  		if (this.specularMap && this.specularMap.isTexture) data.specularMap = this.specularMap.toJSON(meta).uuid

  		if (this.envMap && this.envMap.isTexture) {
  			data.envMap = this.envMap.toJSON(meta).uuid
  			data.reflectivity = this.reflectivity // Scale behind envMap
  		}

  		if (this.gradientMap && this.gradientMap.isTexture) {
  			data.gradientMap = this.gradientMap.toJSON(meta).uuid
  		}

  		if (this.size !== undefined) data.size = this.size
  		if (this.sizeAttenuation !== undefined) data.sizeAttenuation = this.sizeAttenuation

  		if (this.blending !== NormalBlending) data.blending = this.blending
  		if (this.flatShading === true) data.flatShading = this.flatShading
  		if (this.side !== FrontSide) data.side = this.side
  		if (this.vertexColors !== NoColors) data.vertexColors = this.vertexColors

  		if (this.opacity < 1) data.opacity = this.opacity
  		if (this.transparent === true) data.transparent = this.transparent

  		data.depthFunc = this.depthFunc
  		data.depthTest = this.depthTest
  		data.depthWrite = this.depthWrite

  		// rotation (SpriteMaterial)
  		if (this.rotation !== 0) data.rotation = this.rotation

  		if (this.linewidth !== 1) data.linewidth = this.linewidth
  		if (this.dashSize !== undefined) data.dashSize = this.dashSize
  		if (this.gapSize !== undefined) data.gapSize = this.gapSize
  		if (this.scale !== undefined) data.scale = this.scale

  		if (this.dithering === true) data.dithering = true

  		if (this.alphaTest > 0) data.alphaTest = this.alphaTest
  		if (this.premultipliedAlpha === true) data.premultipliedAlpha = this.premultipliedAlpha

  		if (this.wireframe === true) data.wireframe = this.wireframe
  		if (this.wireframeLinewidth > 1) data.wireframeLinewidth = this.wireframeLinewidth
  		if (this.wireframeLinecap !== 'round') data.wireframeLinecap = this.wireframeLinecap
  		if (this.wireframeLinejoin !== 'round') data.wireframeLinejoin = this.wireframeLinejoin

  		if (this.morphTargets === true) data.morphTargets = true
  		if (this.skinning === true) data.skinning = true

  		if (this.visible === false) data.visible = false
  		if (JSON.stringify(this.userData) !== '{}') data.userData = this.userData

  		// TODO: Copied from Object3D.toJSON

  		function extractFromCache (cache) {
  			var values = []

  			for (var key in cache) {
  				var data = cache[key]
  				delete data.metadata
  				values.push(data)
  			}

  			return values
  		}

  		if (isRoot) {
  			var textures = extractFromCache(meta.textures)
  			var images = extractFromCache(meta.images)

  			if (textures.length > 0) data.textures = textures
  			if (images.length > 0) data.images = images
  		}

  		return data
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (source) {
  		this.name = source.name

  		this.fog = source.fog
  		this.lights = source.lights

  		this.blending = source.blending
  		this.side = source.side
  		this.flatShading = source.flatShading
  		this.vertexColors = source.vertexColors

  		this.opacity = source.opacity
  		this.transparent = source.transparent

  		this.blendSrc = source.blendSrc
  		this.blendDst = source.blendDst
  		this.blendEquation = source.blendEquation
  		this.blendSrcAlpha = source.blendSrcAlpha
  		this.blendDstAlpha = source.blendDstAlpha
  		this.blendEquationAlpha = source.blendEquationAlpha

  		this.depthFunc = source.depthFunc
  		this.depthTest = source.depthTest
  		this.depthWrite = source.depthWrite

  		this.colorWrite = source.colorWrite

  		this.precision = source.precision

  		this.polygonOffset = source.polygonOffset
  		this.polygonOffsetFactor = source.polygonOffsetFactor
  		this.polygonOffsetUnits = source.polygonOffsetUnits

  		this.dithering = source.dithering

  		this.alphaTest = source.alphaTest
  		this.premultipliedAlpha = source.premultipliedAlpha

  		this.overdraw = source.overdraw

  		this.visible = source.visible
  		this.userData = JSON.parse(JSON.stringify(source.userData))

  		this.clipShadows = source.clipShadows
  		this.clipIntersection = source.clipIntersection

  		var srcPlanes = source.clippingPlanes
  			var dstPlanes = null

  		if (srcPlanes !== null) {
  			var n = srcPlanes.length
  			dstPlanes = new Array(n)

  			for (var i = 0; i !== n; ++i) { dstPlanes[i] = srcPlanes[i].clone() }
  		}

  		this.clippingPlanes = dstPlanes

  		this.shadowSide = source.shadowSide

  		return this
  	},

  	dispose: function () {
  		this.dispatchEvent({ type: 'dispose' })
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   *
   * parameters = {
   *  color: <hex>,
   *  opacity: <float>,
   *  map: new THREE.Texture( <Image> ),
   *
   *  lightMap: new THREE.Texture( <Image> ),
   *  lightMapIntensity: <float>
   *
   *  aoMap: new THREE.Texture( <Image> ),
   *  aoMapIntensity: <float>
   *
   *  specularMap: new THREE.Texture( <Image> ),
   *
   *  alphaMap: new THREE.Texture( <Image> ),
   *
   *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
   *  combine: THREE.Multiply,
   *  reflectivity: <float>,
   *  refractionRatio: <float>,
   *
   *  depthTest: <bool>,
   *  depthWrite: <bool>,
   *
   *  wireframe: <boolean>,
   *  wireframeLinewidth: <float>,
   *
   *  skinning: <bool>,
   *  morphTargets: <bool>
   * }
   */

  function MeshBasicMaterial (parameters) {
  	Material.call(this)

  	this.type = 'MeshBasicMaterial'

  	this.color = new Color(0xffffff) // emissive

  	this.map = null

  	this.lightMap = null
  	this.lightMapIntensity = 1.0

  	this.aoMap = null
  	this.aoMapIntensity = 1.0

  	this.specularMap = null

  	this.alphaMap = null

  	this.envMap = null
  	this.combine = MultiplyOperation
  	this.reflectivity = 1
  	this.refractionRatio = 0.98

  	this.wireframe = false
  	this.wireframeLinewidth = 1
  	this.wireframeLinecap = 'round'
  	this.wireframeLinejoin = 'round'

  	this.skinning = false
  	this.morphTargets = false

  	this.lights = false

  	this.setValues(parameters)
  }

  MeshBasicMaterial.prototype = Object.create(Material.prototype)
  MeshBasicMaterial.prototype.constructor = MeshBasicMaterial

  MeshBasicMaterial.prototype.isMeshBasicMaterial = true

  MeshBasicMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.color.copy(source.color)

  	this.map = source.map

  	this.lightMap = source.lightMap
  	this.lightMapIntensity = source.lightMapIntensity

  	this.aoMap = source.aoMap
  	this.aoMapIntensity = source.aoMapIntensity

  	this.specularMap = source.specularMap

  	this.alphaMap = source.alphaMap

  	this.envMap = source.envMap
  	this.combine = source.combine
  	this.reflectivity = source.reflectivity
  	this.refractionRatio = source.refractionRatio

  	this.wireframe = source.wireframe
  	this.wireframeLinewidth = source.wireframeLinewidth
  	this.wireframeLinecap = source.wireframeLinecap
  	this.wireframeLinejoin = source.wireframeLinejoin

  	this.skinning = source.skinning
  	this.morphTargets = source.morphTargets

  	return this
  }

  /**
   * @author alteredq / http://alteredqualia.com/
   *
   * parameters = {
   *  defines: { "label" : "value" },
   *  uniforms: { "parameter1": { value: 1.0 }, "parameter2": { value2: 2 } },
   *
   *  fragmentShader: <string>,
   *  vertexShader: <string>,
   *
   *  wireframe: <boolean>,
   *  wireframeLinewidth: <float>,
   *
   *  lights: <bool>,
   *
   *  skinning: <bool>,
   *  morphTargets: <bool>,
   *  morphNormals: <bool>
   * }
   */

  function ShaderMaterial (parameters) {
  	Material.call(this)

  	this.type = 'ShaderMaterial'

  	this.defines = {}
  	this.uniforms = {}

  	this.vertexShader = 'void main() {\n\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n}'
  	this.fragmentShader = 'void main() {\n\tgl_FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );\n}'

  	this.linewidth = 1

  	this.wireframe = false
  	this.wireframeLinewidth = 1

  	this.fog = false // set to use scene fog
  	this.lights = false // set to use scene lights
  	this.clipping = false // set to use user-defined clipping planes

  	this.skinning = false // set to use skinning attribute streams
  	this.morphTargets = false // set to use morph targets
  	this.morphNormals = false // set to use morph normals

  	this.extensions = {
  		derivatives: false, // set to use derivatives
  		fragDepth: false, // set to use fragment depth values
  		drawBuffers: false, // set to use draw buffers
  		shaderTextureLOD: false // set to use shader texture LOD
  	}

  	// When rendered geometry doesn't include these attributes but the material does,
  	// use these default values in WebGL. This avoids errors when buffer data is missing.
  	this.defaultAttributeValues = {
  		color: [1, 1, 1],
  		uv: [0, 0],
  		uv2: [0, 0]
  	}

  	this.index0AttributeName = undefined
  	this.uniformsNeedUpdate = false

  	if (parameters !== undefined) {
  		if (parameters.attributes !== undefined) {
  			console.error('THREE.ShaderMaterial: attributes should now be defined in THREE.BufferGeometry instead.')
  		}

  		this.setValues(parameters)
  	}
  }

  ShaderMaterial.prototype = Object.create(Material.prototype)
  ShaderMaterial.prototype.constructor = ShaderMaterial

  ShaderMaterial.prototype.isShaderMaterial = true

  ShaderMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.fragmentShader = source.fragmentShader
  	this.vertexShader = source.vertexShader

  	this.uniforms = UniformsUtils.clone(source.uniforms)

  	this.defines = Object.assign({}, source.defines)

  	this.wireframe = source.wireframe
  	this.wireframeLinewidth = source.wireframeLinewidth

  	this.lights = source.lights
  	this.clipping = source.clipping

  	this.skinning = source.skinning

  	this.morphTargets = source.morphTargets
  	this.morphNormals = source.morphNormals

  	this.extensions = source.extensions

  	return this
  }

  ShaderMaterial.prototype.toJSON = function (meta) {
  	var data = Material.prototype.toJSON.call(this, meta)

  	data.uniforms = this.uniforms
  	data.vertexShader = this.vertexShader
  	data.fragmentShader = this.fragmentShader

  	return data
  }

  /**
   * @author bhouston / http://clara.io
   */

  function Ray (origin, direction) {
  	this.origin = (origin !== undefined) ? origin : new Vector3()
  	this.direction = (direction !== undefined) ? direction : new Vector3()
  }

  Object.assign(Ray.prototype, {

  	set: function (origin, direction) {
  		this.origin.copy(origin)
  		this.direction.copy(direction)

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (ray) {
  		this.origin.copy(ray.origin)
  		this.direction.copy(ray.direction)

  		return this
  	},

  	at: function (t, target) {
  		if (target === undefined) {
  			console.warn('THREE.Ray: .at() target is now required')
  			target = new Vector3()
  		}

  		return target.copy(this.direction).multiplyScalar(t).add(this.origin)
  	},

  	lookAt: function (v) {
  		this.direction.copy(v).sub(this.origin).normalize()

  		return this
  	},

  	recast: (function () {
  		var v1 = new Vector3()

  		return function recast (t) {
  			this.origin.copy(this.at(t, v1))

  			return this
  		}
  	}()),

  	closestPointToPoint: function (point, target) {
  		if (target === undefined) {
  			console.warn('THREE.Ray: .closestPointToPoint() target is now required')
  			target = new Vector3()
  		}

  		target.subVectors(point, this.origin)

  		var directionDistance = target.dot(this.direction)

  		if (directionDistance < 0) {
  			return target.copy(this.origin)
  		}

  		return target.copy(this.direction).multiplyScalar(directionDistance).add(this.origin)
  	},

  	distanceToPoint: function (point) {
  		return Math.sqrt(this.distanceSqToPoint(point))
  	},

  	distanceSqToPoint: (function () {
  		var v1 = new Vector3()

  		return function distanceSqToPoint (point) {
  			var directionDistance = v1.subVectors(point, this.origin).dot(this.direction)

  			// point behind the ray

  			if (directionDistance < 0) {
  				return this.origin.distanceToSquared(point)
  			}

  			v1.copy(this.direction).multiplyScalar(directionDistance).add(this.origin)

  			return v1.distanceToSquared(point)
  		}
  	}()),

  	distanceSqToSegment: (function () {
  		var segCenter = new Vector3()
  		var segDir = new Vector3()
  		var diff = new Vector3()

  		return function distanceSqToSegment (v0, v1, optionalPointOnRay, optionalPointOnSegment) {
  			// from http://www.geometrictools.com/GTEngine/Include/Mathematics/GteDistRaySegment.h
  			// It returns the min distance between the ray and the segment
  			// defined by v0 and v1
  			// It can also set two optional targets :
  			// - The closest point on the ray
  			// - The closest point on the segment

  			segCenter.copy(v0).add(v1).multiplyScalar(0.5)
  			segDir.copy(v1).sub(v0).normalize()
  			diff.copy(this.origin).sub(segCenter)

  			var segExtent = v0.distanceTo(v1) * 0.5
  			var a01 = -this.direction.dot(segDir)
  			var b0 = diff.dot(this.direction)
  			var b1 = -diff.dot(segDir)
  			var c = diff.lengthSq()
  			var det = Math.abs(1 - a01 * a01)
  			var s0, s1, sqrDist, extDet

  			if (det > 0) {
  				// The ray and segment are not parallel.

  				s0 = a01 * b1 - b0
  				s1 = a01 * b0 - b1
  				extDet = segExtent * det

  				if (s0 >= 0) {
  					if (s1 >= -extDet) {
  						if (s1 <= extDet) {
  							// region 0
  							// Minimum at interior points of ray and segment.

  							var invDet = 1 / det
  							s0 *= invDet
  							s1 *= invDet
  							sqrDist = s0 * (s0 + a01 * s1 + 2 * b0) + s1 * (a01 * s0 + s1 + 2 * b1) + c
  						} else {
  							// region 1

  							s1 = segExtent
  							s0 = Math.max(0, -(a01 * s1 + b0))
  							sqrDist = -s0 * s0 + s1 * (s1 + 2 * b1) + c
  						}
  					} else {
  						// region 5

  						s1 = -segExtent
  						s0 = Math.max(0, -(a01 * s1 + b0))
  						sqrDist = -s0 * s0 + s1 * (s1 + 2 * b1) + c
  					}
  				} else {
  					if (s1 <= -extDet) {
  						// region 4

  						s0 = Math.max(0, -(-a01 * segExtent + b0))
  						s1 = (s0 > 0) ? -segExtent : Math.min(Math.max(-segExtent, -b1), segExtent)
  						sqrDist = -s0 * s0 + s1 * (s1 + 2 * b1) + c
  					} else if (s1 <= extDet) {
  						// region 3

  						s0 = 0
  						s1 = Math.min(Math.max(-segExtent, -b1), segExtent)
  						sqrDist = s1 * (s1 + 2 * b1) + c
  					} else {
  						// region 2

  						s0 = Math.max(0, -(a01 * segExtent + b0))
  						s1 = (s0 > 0) ? segExtent : Math.min(Math.max(-segExtent, -b1), segExtent)
  						sqrDist = -s0 * s0 + s1 * (s1 + 2 * b1) + c
  					}
  				}
  			} else {
  				// Ray and segment are parallel.

  				s1 = (a01 > 0) ? -segExtent : segExtent
  				s0 = Math.max(0, -(a01 * s1 + b0))
  				sqrDist = -s0 * s0 + s1 * (s1 + 2 * b1) + c
  			}

  			if (optionalPointOnRay) {
  				optionalPointOnRay.copy(this.direction).multiplyScalar(s0).add(this.origin)
  			}

  			if (optionalPointOnSegment) {
  				optionalPointOnSegment.copy(segDir).multiplyScalar(s1).add(segCenter)
  			}

  			return sqrDist
  		}
  	}()),

  	intersectSphere: (function () {
  		var v1 = new Vector3()

  		return function intersectSphere (sphere, target) {
  			v1.subVectors(sphere.center, this.origin)
  			var tca = v1.dot(this.direction)
  			var d2 = v1.dot(v1) - tca * tca
  			var radius2 = sphere.radius * sphere.radius

  			if (d2 > radius2) return null

  			var thc = Math.sqrt(radius2 - d2)

  			// t0 = first intersect point - entrance on front of sphere
  			var t0 = tca - thc

  			// t1 = second intersect point - exit point on back of sphere
  			var t1 = tca + thc

  			// test to see if both t0 and t1 are behind the ray - if so, return null
  			if (t0 < 0 && t1 < 0) return null

  			// test to see if t0 is behind the ray:
  			// if it is, the ray is inside the sphere, so return the second exit point scaled by t1,
  			// in order to always return an intersect point that is in front of the ray.
  			if (t0 < 0) return this.at(t1, target)

  			// else t0 is in front of the ray, so return the first collision point scaled by t0
  			return this.at(t0, target)
  		}
  	}()),

  	intersectsSphere: function (sphere) {
  		return this.distanceToPoint(sphere.center) <= sphere.radius
  	},

  	distanceToPlane: function (plane) {
  		var denominator = plane.normal.dot(this.direction)

  		if (denominator === 0) {
  			// line is coplanar, return origin
  			if (plane.distanceToPoint(this.origin) === 0) {
  				return 0
  			}

  			// Null is preferable to undefined since undefined means.... it is undefined

  			return null
  		}

  		var t = -(this.origin.dot(plane.normal) + plane.constant) / denominator

  		// Return if the ray never intersects the plane

  		return t >= 0 ? t : null
  	},

  	intersectPlane: function (plane, target) {
  		var t = this.distanceToPlane(plane)

  		if (t === null) {
  			return null
  		}

  		return this.at(t, target)
  	},

  	intersectsPlane: function (plane) {
  		// check if the ray lies on the plane first

  		var distToPoint = plane.distanceToPoint(this.origin)

  		if (distToPoint === 0) {
  			return true
  		}

  		var denominator = plane.normal.dot(this.direction)

  		if (denominator * distToPoint < 0) {
  			return true
  		}

  		// ray origin is behind the plane (and is pointing behind it)

  		return false
  	},

  	intersectBox: function (box, target) {
  		var tmin, tmax, tymin, tymax, tzmin, tzmax

  		var invdirx = 1 / this.direction.x
  			var invdiry = 1 / this.direction.y
  			var invdirz = 1 / this.direction.z

  		var origin = this.origin

  		if (invdirx >= 0) {
  			tmin = (box.min.x - origin.x) * invdirx
  			tmax = (box.max.x - origin.x) * invdirx
  		} else {
  			tmin = (box.max.x - origin.x) * invdirx
  			tmax = (box.min.x - origin.x) * invdirx
  		}

  		if (invdiry >= 0) {
  			tymin = (box.min.y - origin.y) * invdiry
  			tymax = (box.max.y - origin.y) * invdiry
  		} else {
  			tymin = (box.max.y - origin.y) * invdiry
  			tymax = (box.min.y - origin.y) * invdiry
  		}

  		if ((tmin > tymax) || (tymin > tmax)) return null

  		// These lines also handle the case where tmin or tmax is NaN
  		// (result of 0 * Infinity). x !== x returns true if x is NaN

  		if (tymin > tmin || tmin !== tmin) tmin = tymin

  		if (tymax < tmax || tmax !== tmax) tmax = tymax

  		if (invdirz >= 0) {
  			tzmin = (box.min.z - origin.z) * invdirz
  			tzmax = (box.max.z - origin.z) * invdirz
  		} else {
  			tzmin = (box.max.z - origin.z) * invdirz
  			tzmax = (box.min.z - origin.z) * invdirz
  		}

  		if ((tmin > tzmax) || (tzmin > tmax)) return null

  		if (tzmin > tmin || tmin !== tmin) tmin = tzmin

  		if (tzmax < tmax || tmax !== tmax) tmax = tzmax

  		// return point closest to the ray (positive side)

  		if (tmax < 0) return null

  		return this.at(tmin >= 0 ? tmin : tmax, target)
  	},

  	intersectsBox: (function () {
  		var v = new Vector3()

  		return function intersectsBox (box) {
  			return this.intersectBox(box, v) !== null
  		}
  	})(),

  	intersectTriangle: (function () {
  		// Compute the offset origin, edges, and normal.
  		var diff = new Vector3()
  		var edge1 = new Vector3()
  		var edge2 = new Vector3()
  		var normal = new Vector3()

  		return function intersectTriangle (a, b, c, backfaceCulling, target) {
  			// from http://www.geometrictools.com/GTEngine/Include/Mathematics/GteIntrRay3Triangle3.h

  			edge1.subVectors(b, a)
  			edge2.subVectors(c, a)
  			normal.crossVectors(edge1, edge2)

  			// Solve Q + t*D = b1*E1 + b2*E2 (Q = kDiff, D = ray direction,
  			// E1 = kEdge1, E2 = kEdge2, N = Cross(E1,E2)) by
  			//   |Dot(D,N)|*b1 = sign(Dot(D,N))*Dot(D,Cross(Q,E2))
  			//   |Dot(D,N)|*b2 = sign(Dot(D,N))*Dot(D,Cross(E1,Q))
  			//   |Dot(D,N)|*t = -sign(Dot(D,N))*Dot(Q,N)
  			var DdN = this.direction.dot(normal)
  			var sign

  			if (DdN > 0) {
  				if (backfaceCulling) return null
  				sign = 1
  			} else if (DdN < 0) {
  				sign = -1
  				DdN = -DdN
  			} else {
  				return null
  			}

  			diff.subVectors(this.origin, a)
  			var DdQxE2 = sign * this.direction.dot(edge2.crossVectors(diff, edge2))

  			// b1 < 0, no intersection
  			if (DdQxE2 < 0) {
  				return null
  			}

  			var DdE1xQ = sign * this.direction.dot(edge1.cross(diff))

  			// b2 < 0, no intersection
  			if (DdE1xQ < 0) {
  				return null
  			}

  			// b1+b2 > 1, no intersection
  			if (DdQxE2 + DdE1xQ > DdN) {
  				return null
  			}

  			// Line intersects triangle, check if ray does.
  			var QdN = -sign * diff.dot(normal)

  			// t < 0, no intersection
  			if (QdN < 0) {
  				return null
  			}

  			// Ray intersects triangle.
  			return this.at(QdN / DdN, target)
  		}
  	}()),

  	applyMatrix4: function (matrix4) {
  		this.origin.applyMatrix4(matrix4)
  		this.direction.transformDirection(matrix4)

  		return this
  	},

  	equals: function (ray) {
  		return ray.origin.equals(this.origin) && ray.direction.equals(this.direction)
  	}

  })

  /**
   * @author bhouston / http://clara.io
   */

  function Line3 (start, end) {
  	this.start = (start !== undefined) ? start : new Vector3()
  	this.end = (end !== undefined) ? end : new Vector3()
  }

  Object.assign(Line3.prototype, {

  	set: function (start, end) {
  		this.start.copy(start)
  		this.end.copy(end)

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (line) {
  		this.start.copy(line.start)
  		this.end.copy(line.end)

  		return this
  	},

  	getCenter: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Line3: .getCenter() target is now required')
  			target = new Vector3()
  		}

  		return target.addVectors(this.start, this.end).multiplyScalar(0.5)
  	},

  	delta: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Line3: .delta() target is now required')
  			target = new Vector3()
  		}

  		return target.subVectors(this.end, this.start)
  	},

  	distanceSq: function () {
  		return this.start.distanceToSquared(this.end)
  	},

  	distance: function () {
  		return this.start.distanceTo(this.end)
  	},

  	at: function (t, target) {
  		if (target === undefined) {
  			console.warn('THREE.Line3: .at() target is now required')
  			target = new Vector3()
  		}

  		return this.delta(target).multiplyScalar(t).add(this.start)
  	},

  	closestPointToPointParameter: (function () {
  		var startP = new Vector3()
  		var startEnd = new Vector3()

  		return function closestPointToPointParameter (point, clampToLine) {
  			startP.subVectors(point, this.start)
  			startEnd.subVectors(this.end, this.start)

  			var startEnd2 = startEnd.dot(startEnd)
  			var startEnd_startP = startEnd.dot(startP)

  			var t = startEnd_startP / startEnd2

  			if (clampToLine) {
  				t = _Math.clamp(t, 0, 1)
  			}

  			return t
  		}
  	}()),

  	closestPointToPoint: function (point, clampToLine, target) {
  		var t = this.closestPointToPointParameter(point, clampToLine)

  		if (target === undefined) {
  			console.warn('THREE.Line3: .closestPointToPoint() target is now required')
  			target = new Vector3()
  		}

  		return this.delta(target).multiplyScalar(t).add(this.start)
  	},

  	applyMatrix4: function (matrix) {
  		this.start.applyMatrix4(matrix)
  		this.end.applyMatrix4(matrix)

  		return this
  	},

  	equals: function (line) {
  		return line.start.equals(this.start) && line.end.equals(this.end)
  	}

  })

  /**
   * @author bhouston / http://clara.io
   * @author mrdoob / http://mrdoob.com/
   */

  function Triangle (a, b, c) {
  	this.a = (a !== undefined) ? a : new Vector3()
  	this.b = (b !== undefined) ? b : new Vector3()
  	this.c = (c !== undefined) ? c : new Vector3()
  }

  Object.assign(Triangle, {

  	getNormal: (function () {
  		var v0 = new Vector3()

  		return function getNormal (a, b, c, target) {
  			if (target === undefined) {
  				console.warn('THREE.Triangle: .getNormal() target is now required')
  				target = new Vector3()
  			}

  			target.subVectors(c, b)
  			v0.subVectors(a, b)
  			target.cross(v0)

  			var targetLengthSq = target.lengthSq()
  			if (targetLengthSq > 0) {
  				return target.multiplyScalar(1 / Math.sqrt(targetLengthSq))
  			}

  			return target.set(0, 0, 0)
  		}
  	}()),

  	// static/instance method to calculate barycentric coordinates
  	// based on: http://www.blackpawn.com/texts/pointinpoly/default.html
  	getBarycoord: (function () {
  		var v0 = new Vector3()
  		var v1 = new Vector3()
  		var v2 = new Vector3()

  		return function getBarycoord (point, a, b, c, target) {
  			v0.subVectors(c, a)
  			v1.subVectors(b, a)
  			v2.subVectors(point, a)

  			var dot00 = v0.dot(v0)
  			var dot01 = v0.dot(v1)
  			var dot02 = v0.dot(v2)
  			var dot11 = v1.dot(v1)
  			var dot12 = v1.dot(v2)

  			var denom = (dot00 * dot11 - dot01 * dot01)

  			if (target === undefined) {
  				console.warn('THREE.Triangle: .getBarycoord() target is now required')
  				target = new Vector3()
  			}

  			// collinear or singular triangle
  			if (denom === 0) {
  				// arbitrary location outside of triangle?
  				// not sure if this is the best idea, maybe should be returning undefined
  				return target.set(-2, -1, -1)
  			}

  			var invDenom = 1 / denom
  			var u = (dot11 * dot02 - dot01 * dot12) * invDenom
  			var v = (dot00 * dot12 - dot01 * dot02) * invDenom

  			// barycentric coordinates must always sum to 1
  			return target.set(1 - u - v, v, u)
  		}
  	}()),

  	containsPoint: (function () {
  		var v1 = new Vector3()

  		return function containsPoint (point, a, b, c) {
  			Triangle.getBarycoord(point, a, b, c, v1)

  			return (v1.x >= 0) && (v1.y >= 0) && ((v1.x + v1.y) <= 1)
  		}
  	}())

  })

  Object.assign(Triangle.prototype, {

  	set: function (a, b, c) {
  		this.a.copy(a)
  		this.b.copy(b)
  		this.c.copy(c)

  		return this
  	},

  	setFromPointsAndIndices: function (points, i0, i1, i2) {
  		this.a.copy(points[i0])
  		this.b.copy(points[i1])
  		this.c.copy(points[i2])

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (triangle) {
  		this.a.copy(triangle.a)
  		this.b.copy(triangle.b)
  		this.c.copy(triangle.c)

  		return this
  	},

  	getArea: (function () {
  		var v0 = new Vector3()
  		var v1 = new Vector3()

  		return function getArea () {
  			v0.subVectors(this.c, this.b)
  			v1.subVectors(this.a, this.b)

  			return v0.cross(v1).length() * 0.5
  		}
  	}()),

  	getMidpoint: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Triangle: .getMidpoint() target is now required')
  			target = new Vector3()
  		}

  		return target.addVectors(this.a, this.b).add(this.c).multiplyScalar(1 / 3)
  	},

  	getNormal: function (target) {
  		return Triangle.getNormal(this.a, this.b, this.c, target)
  	},

  	getPlane: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Triangle: .getPlane() target is now required')
  			target = new Vector3()
  		}

  		return target.setFromCoplanarPoints(this.a, this.b, this.c)
  	},

  	getBarycoord: function (point, target) {
  		return Triangle.getBarycoord(point, this.a, this.b, this.c, target)
  	},

  	containsPoint: function (point) {
  		return Triangle.containsPoint(point, this.a, this.b, this.c)
  	},

  	intersectsBox: function (box) {
  		return box.intersectsTriangle(this)
  	},

  	closestPointToPoint: (function () {
  		var plane = new Plane()
  		var edgeList = [new Line3(), new Line3(), new Line3()]
  		var projectedPoint = new Vector3()
  		var closestPoint = new Vector3()

  		return function closestPointToPoint (point, target) {
  			if (target === undefined) {
  				console.warn('THREE.Triangle: .closestPointToPoint() target is now required')
  				target = new Vector3()
  			}

  			var minDistance = Infinity

  			// project the point onto the plane of the triangle

  			plane.setFromCoplanarPoints(this.a, this.b, this.c)
  			plane.projectPoint(point, projectedPoint)

  			// check if the projection lies within the triangle

  			if (this.containsPoint(projectedPoint) === true) {
  				// if so, this is the closest point

  				target.copy(projectedPoint)
  			} else {
  				// if not, the point falls outside the triangle. the target is the closest point to the triangle's edges or vertices

  				edgeList[0].set(this.a, this.b)
  				edgeList[1].set(this.b, this.c)
  				edgeList[2].set(this.c, this.a)

  				for (var i = 0; i < edgeList.length; i++) {
  					edgeList[i].closestPointToPoint(projectedPoint, true, closestPoint)

  					var distance = projectedPoint.distanceToSquared(closestPoint)

  					if (distance < minDistance) {
  						minDistance = distance

  						target.copy(closestPoint)
  					}
  				}
  			}

  			return target
  		}
  	}()),

  	equals: function (triangle) {
  		return triangle.a.equals(this.a) && triangle.b.equals(this.b) && triangle.c.equals(this.c)
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   * @author mikael emtinger / http://gomo.se/
   * @author jonobr1 / http://jonobr1.com/
   */

  function Mesh (geometry, material) {
  	Object3D.call(this)

  	this.type = 'Mesh'

  	this.geometry = geometry !== undefined ? geometry : new BufferGeometry()
  	this.material = material !== undefined ? material : new MeshBasicMaterial({ color: Math.random() * 0xffffff })

  	this.drawMode = TrianglesDrawMode

  	this.updateMorphTargets()
  }

  Mesh.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Mesh,

  	isMesh: true,

  	setDrawMode: function (value) {
  		this.drawMode = value
  	},

  	copy: function (source) {
  		Object3D.prototype.copy.call(this, source)

  		this.drawMode = source.drawMode

  		if (source.morphTargetInfluences !== undefined) {
  			this.morphTargetInfluences = source.morphTargetInfluences.slice()
  		}

  		if (source.morphTargetDictionary !== undefined) {
  			this.morphTargetDictionary = Object.assign({}, source.morphTargetDictionary)
  		}

  		return this
  	},

  	updateMorphTargets: function () {
  		var geometry = this.geometry
  		var m, ml, name

  		if (geometry.isBufferGeometry) {
  			var morphAttributes = geometry.morphAttributes
  			var keys = Object.keys(morphAttributes)

  			if (keys.length > 0) {
  				var morphAttribute = morphAttributes[keys[0]]

  				if (morphAttribute !== undefined) {
  					this.morphTargetInfluences = []
  					this.morphTargetDictionary = {}

  					for (m = 0, ml = morphAttribute.length; m < ml; m++) {
  						name = morphAttribute[m].name || String(m)

  						this.morphTargetInfluences.push(0)
  						this.morphTargetDictionary[name] = m
  					}
  				}
  			}
  		} else {
  			var morphTargets = geometry.morphTargets

  			if (morphTargets !== undefined && morphTargets.length > 0) {
  				this.morphTargetInfluences = []
  				this.morphTargetDictionary = {}

  				for (m = 0, ml = morphTargets.length; m < ml; m++) {
  					name = morphTargets[m].name || String(m)

  					this.morphTargetInfluences.push(0)
  					this.morphTargetDictionary[name] = m
  				}
  			}
  		}
  	},

  	raycast: (function () {
  		var inverseMatrix = new Matrix4()
  		var ray = new Ray()
  		var sphere = new Sphere()

  		var vA = new Vector3()
  		var vB = new Vector3()
  		var vC = new Vector3()

  		var tempA = new Vector3()
  		var tempB = new Vector3()
  		var tempC = new Vector3()

  		var uvA = new Vector2()
  		var uvB = new Vector2()
  		var uvC = new Vector2()

  		var barycoord = new Vector3()

  		var intersectionPoint = new Vector3()
  		var intersectionPointWorld = new Vector3()

  		function uvIntersection (point, p1, p2, p3, uv1, uv2, uv3) {
  			Triangle.getBarycoord(point, p1, p2, p3, barycoord)

  			uv1.multiplyScalar(barycoord.x)
  			uv2.multiplyScalar(barycoord.y)
  			uv3.multiplyScalar(barycoord.z)

  			uv1.add(uv2).add(uv3)

  			return uv1.clone()
  		}

  		function checkIntersection (object, material, raycaster, ray, pA, pB, pC, point) {
  			var intersect

  			if (material.side === BackSide) {
  				intersect = ray.intersectTriangle(pC, pB, pA, true, point)
  			} else {
  				intersect = ray.intersectTriangle(pA, pB, pC, material.side !== DoubleSide, point)
  			}

  			if (intersect === null) return null

  			intersectionPointWorld.copy(point)
  			intersectionPointWorld.applyMatrix4(object.matrixWorld)

  			var distance = raycaster.ray.origin.distanceTo(intersectionPointWorld)

  			if (distance < raycaster.near || distance > raycaster.far) return null

  			return {
  				distance: distance,
  				point: intersectionPointWorld.clone(),
  				object: object
  			}
  		}

  		function checkBufferGeometryIntersection (object, raycaster, ray, position, uv, a, b, c) {
  			vA.fromBufferAttribute(position, a)
  			vB.fromBufferAttribute(position, b)
  			vC.fromBufferAttribute(position, c)

  			var intersection = checkIntersection(object, object.material, raycaster, ray, vA, vB, vC, intersectionPoint)

  			if (intersection) {
  				if (uv) {
  					uvA.fromBufferAttribute(uv, a)
  					uvB.fromBufferAttribute(uv, b)
  					uvC.fromBufferAttribute(uv, c)

  					intersection.uv = uvIntersection(intersectionPoint, vA, vB, vC, uvA, uvB, uvC)
  				}

  				var face = new Face3(a, b, c)
  				Triangle.getNormal(vA, vB, vC, face.normal)

  				intersection.face = face
  			}

  			return intersection
  		}

  		return function raycast (raycaster, intersects) {
  			var geometry = this.geometry
  			var material = this.material
  			var matrixWorld = this.matrixWorld

  			if (material === undefined) return

  			// Checking boundingSphere distance to ray

  			if (geometry.boundingSphere === null) geometry.computeBoundingSphere()

  			sphere.copy(geometry.boundingSphere)
  			sphere.applyMatrix4(matrixWorld)

  			if (raycaster.ray.intersectsSphere(sphere) === false) return

  			//

  			inverseMatrix.getInverse(matrixWorld)
  			ray.copy(raycaster.ray).applyMatrix4(inverseMatrix)

  			// Check boundingBox before continuing

  			if (geometry.boundingBox !== null) {
  				if (ray.intersectsBox(geometry.boundingBox) === false) return
  			}

  			var intersection

  			if (geometry.isBufferGeometry) {
  				var a, b, c
  				var index = geometry.index
  				var position = geometry.attributes.position
  				var uv = geometry.attributes.uv
  				var i, l

  				if (index !== null) {
  					// indexed buffer geometry

  					for (i = 0, l = index.count; i < l; i += 3) {
  						a = index.getX(i)
  						b = index.getX(i + 1)
  						c = index.getX(i + 2)

  						intersection = checkBufferGeometryIntersection(this, raycaster, ray, position, uv, a, b, c)

  						if (intersection) {
  							intersection.faceIndex = Math.floor(i / 3) // triangle number in indexed buffer semantics
  							intersects.push(intersection)
  						}
  					}
  				} else if (position !== undefined) {
  					// non-indexed buffer geometry

  					for (i = 0, l = position.count; i < l; i += 3) {
  						a = i
  						b = i + 1
  						c = i + 2

  						intersection = checkBufferGeometryIntersection(this, raycaster, ray, position, uv, a, b, c)

  						if (intersection) {
  							intersection.faceIndex = Math.floor(i / 3) // triangle number in non-indexed buffer semantics
  							intersects.push(intersection)
  						}
  					}
  				}
  			} else if (geometry.isGeometry) {
  				var fvA, fvB, fvC
  				var isMultiMaterial = Array.isArray(material)

  				var vertices = geometry.vertices
  				var faces = geometry.faces
  				var uvs

  				var faceVertexUvs = geometry.faceVertexUvs[0]
  				if (faceVertexUvs.length > 0) uvs = faceVertexUvs

  				for (var f = 0, fl = faces.length; f < fl; f++) {
  					var face = faces[f]
  					var faceMaterial = isMultiMaterial ? material[face.materialIndex] : material

  					if (faceMaterial === undefined) continue

  					fvA = vertices[face.a]
  					fvB = vertices[face.b]
  					fvC = vertices[face.c]

  					if (faceMaterial.morphTargets === true) {
  						var morphTargets = geometry.morphTargets
  						var morphInfluences = this.morphTargetInfluences

  						vA.set(0, 0, 0)
  						vB.set(0, 0, 0)
  						vC.set(0, 0, 0)

  						for (var t = 0, tl = morphTargets.length; t < tl; t++) {
  							var influence = morphInfluences[t]

  							if (influence === 0) continue

  							var targets = morphTargets[t].vertices

  							vA.addScaledVector(tempA.subVectors(targets[face.a], fvA), influence)
  							vB.addScaledVector(tempB.subVectors(targets[face.b], fvB), influence)
  							vC.addScaledVector(tempC.subVectors(targets[face.c], fvC), influence)
  						}

  						vA.add(fvA)
  						vB.add(fvB)
  						vC.add(fvC)

  						fvA = vA
  						fvB = vB
  						fvC = vC
  					}

  					intersection = checkIntersection(this, faceMaterial, raycaster, ray, fvA, fvB, fvC, intersectionPoint)

  					if (intersection) {
  						if (uvs && uvs[f]) {
  							var uvs_f = uvs[f]
  							uvA.copy(uvs_f[0])
  							uvB.copy(uvs_f[1])
  							uvC.copy(uvs_f[2])

  							intersection.uv = uvIntersection(intersectionPoint, fvA, fvB, fvC, uvA, uvB, uvC)
  						}

  						intersection.face = face
  						intersection.faceIndex = f
  						intersects.push(intersection)
  					}
  				}
  			}
  		}
  	}()),

  	clone: function () {
  		return new this.constructor(this.geometry, this.material).copy(this)
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLBackground (renderer, state, objects, premultipliedAlpha) {
  	var clearColor = new Color(0x000000)
  	var clearAlpha = 0

  	var planeCamera, planeMesh
  	var boxMesh

  	function render (renderList, scene, camera, forceClear) {
  		var background = scene.background

  		if (background === null) {
  			setClear(clearColor, clearAlpha)
  		} else if (background && background.isColor) {
  			setClear(background, 1)
  			forceClear = true
  		}

  		if (renderer.autoClear || forceClear) {
  			renderer.clear(renderer.autoClearColor, renderer.autoClearDepth, renderer.autoClearStencil)
  		}

  		if (background && background.isCubeTexture) {
  			if (boxMesh === undefined) {
  				boxMesh = new Mesh(
  					new BoxBufferGeometry(1, 1, 1),
  					new ShaderMaterial({
  						uniforms: ShaderLib.cube.uniforms,
  						vertexShader: ShaderLib.cube.vertexShader,
  						fragmentShader: ShaderLib.cube.fragmentShader,
  						side: BackSide,
  						depthTest: true,
  						depthWrite: false,
  						fog: false
  					})
  				)

  				boxMesh.geometry.removeAttribute('normal')
  				boxMesh.geometry.removeAttribute('uv')

  				boxMesh.onBeforeRender = function (renderer, scene, camera) {
  					this.matrixWorld.copyPosition(camera.matrixWorld)
  				}

  				objects.update(boxMesh)
  			}

  			boxMesh.material.uniforms.tCube.value = background

  			renderList.push(boxMesh, boxMesh.geometry, boxMesh.material, 0, null)
  		} else if (background && background.isTexture) {
  			if (planeCamera === undefined) {
  				planeCamera = new OrthographicCamera(-1, 1, 1, -1, 0, 1)

  				planeMesh = new Mesh(
  					new PlaneBufferGeometry(2, 2),
  					new MeshBasicMaterial({ depthTest: false, depthWrite: false, fog: false })
  				)

  				objects.update(planeMesh)
  			}

  			planeMesh.material.map = background

  			// TODO Push this to renderList

  			renderer.renderBufferDirect(planeCamera, null, planeMesh.geometry, planeMesh.material, planeMesh, null)
  		}
  	}

  	function setClear (color, alpha) {
  		state.buffers.color.setClear(color.r, color.g, color.b, alpha, premultipliedAlpha)
  	}

  	return {

  		getClearColor: function () {
  			return clearColor
  		},
  		setClearColor: function (color, alpha) {
  			clearColor.set(color)
  			clearAlpha = alpha !== undefined ? alpha : 1
  			setClear(clearColor, clearAlpha)
  		},
  		getClearAlpha: function () {
  			return clearAlpha
  		},
  		setClearAlpha: function (alpha) {
  			clearAlpha = alpha
  			setClear(clearColor, clearAlpha)
  		},
  		render: render

  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLBufferRenderer (gl, extensions, info) {
  	var mode

  	function setMode (value) {
  		mode = value
  	}

  	function render (start, count) {
  		gl.drawArrays(mode, start, count)

  		info.update(count, mode)
  	}

  	function renderInstances (geometry, start, count) {
  		var extension = extensions.get('ANGLE_instanced_arrays')

  		if (extension === null) {
  			console.error('THREE.WebGLBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.')
  			return
  		}

  		extension.drawArraysInstancedANGLE(mode, start, count, geometry.maxInstancedCount)

  		info.update(count, mode, geometry.maxInstancedCount)
  	}

  	//

  	this.setMode = setMode
  	this.render = render
  	this.renderInstances = renderInstances
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLCapabilities (gl, extensions, parameters) {
  	var maxAnisotropy

  	function getMaxAnisotropy () {
  		if (maxAnisotropy !== undefined) return maxAnisotropy

  		var extension = extensions.get('EXT_texture_filter_anisotropic')

  		if (extension !== null) {
  			maxAnisotropy = gl.getParameter(extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT)
  		} else {
  			maxAnisotropy = 0
  		}

  		return maxAnisotropy
  	}

  	function getMaxPrecision (precision) {
  		if (precision === 'highp') {
  			if (gl.getShaderPrecisionFormat(gl.VERTEX_SHADER, gl.HIGH_FLOAT).precision > 0 &&
  			     gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.HIGH_FLOAT).precision > 0) {
  				return 'highp'
  			}

  			precision = 'mediump'
  		}

  		if (precision === 'mediump') {
  			if (gl.getShaderPrecisionFormat(gl.VERTEX_SHADER, gl.MEDIUM_FLOAT).precision > 0 &&
  			     gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.MEDIUM_FLOAT).precision > 0) {
  				return 'mediump'
  			}
  		}

  		return 'lowp'
  	}

  	var precision = parameters.precision !== undefined ? parameters.precision : 'highp'
  	var maxPrecision = getMaxPrecision(precision)

  	if (maxPrecision !== precision) {
  		console.warn('THREE.WebGLRenderer:', precision, 'not supported, using', maxPrecision, 'instead.')
  		precision = maxPrecision
  	}

  	var logarithmicDepthBuffer = parameters.logarithmicDepthBuffer === true

  	var maxTextures = gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS)
  	var maxVertexTextures = gl.getParameter(gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS)
  	var maxTextureSize = gl.getParameter(gl.MAX_TEXTURE_SIZE)
  	var maxCubemapSize = gl.getParameter(gl.MAX_CUBE_MAP_TEXTURE_SIZE)

  	var maxAttributes = gl.getParameter(gl.MAX_VERTEX_ATTRIBS)
  	var maxVertexUniforms = gl.getParameter(gl.MAX_VERTEX_UNIFORM_VECTORS)
  	var maxVaryings = gl.getParameter(gl.MAX_VARYING_VECTORS)
  	var maxFragmentUniforms = gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_VECTORS)

  	var vertexTextures = maxVertexTextures > 0
  	var floatFragmentTextures = !!extensions.get('OES_texture_float')
  	var floatVertexTextures = vertexTextures && floatFragmentTextures

  	return {

  		getMaxAnisotropy: getMaxAnisotropy,
  		getMaxPrecision: getMaxPrecision,

  		precision: precision,
  		logarithmicDepthBuffer: logarithmicDepthBuffer,

  		maxTextures: maxTextures,
  		maxVertexTextures: maxVertexTextures,
  		maxTextureSize: maxTextureSize,
  		maxCubemapSize: maxCubemapSize,

  		maxAttributes: maxAttributes,
  		maxVertexUniforms: maxVertexUniforms,
  		maxVaryings: maxVaryings,
  		maxFragmentUniforms: maxFragmentUniforms,

  		vertexTextures: vertexTextures,
  		floatFragmentTextures: floatFragmentTextures,
  		floatVertexTextures: floatVertexTextures

  	}
  }

  /**
   * @author tschw
   */

  function WebGLClipping () {
  	var scope = this

  		var globalState = null
  		var numGlobalPlanes = 0
  		var localClippingEnabled = false
  		var renderingShadows = false

  		var plane = new Plane()
  		var viewNormalMatrix = new Matrix3()

  		var uniform = { value: null, needsUpdate: false }

  	this.uniform = uniform
  	this.numPlanes = 0
  	this.numIntersection = 0

  	this.init = function (planes, enableLocalClipping, camera) {
  		var enabled =
  			planes.length !== 0 ||
  			enableLocalClipping ||
  			// enable state of previous frame - the clipping code has to
  			// run another frame in order to reset the state:
  			numGlobalPlanes !== 0 ||
  			localClippingEnabled

  		localClippingEnabled = enableLocalClipping

  		globalState = projectPlanes(planes, camera, 0)
  		numGlobalPlanes = planes.length

  		return enabled
  	}

  	this.beginShadows = function () {
  		renderingShadows = true
  		projectPlanes(null)
  	}

  	this.endShadows = function () {
  		renderingShadows = false
  		resetGlobalState()
  	}

  	this.setState = function (planes, clipIntersection, clipShadows, camera, cache, fromCache) {
  		if (!localClippingEnabled || planes === null || planes.length === 0 || renderingShadows && !clipShadows) {
  			// there's no local clipping

  			if (renderingShadows) {
  				// there's no global clipping

  				projectPlanes(null)
  			} else {
  				resetGlobalState()
  			}
  		} else {
  			var nGlobal = renderingShadows ? 0 : numGlobalPlanes
  				var lGlobal = nGlobal * 4

  				var dstArray = cache.clippingState || null

  			uniform.value = dstArray // ensure unique state

  			dstArray = projectPlanes(planes, camera, lGlobal, fromCache)

  			for (var i = 0; i !== lGlobal; ++i) {
  				dstArray[i] = globalState[i]
  			}

  			cache.clippingState = dstArray
  			this.numIntersection = clipIntersection ? this.numPlanes : 0
  			this.numPlanes += nGlobal
  		}
  	}

  	function resetGlobalState () {
  		if (uniform.value !== globalState) {
  			uniform.value = globalState
  			uniform.needsUpdate = numGlobalPlanes > 0
  		}

  		scope.numPlanes = numGlobalPlanes
  		scope.numIntersection = 0
  	}

  	function projectPlanes (planes, camera, dstOffset, skipTransform) {
  		var nPlanes = planes !== null ? planes.length : 0
  			var dstArray = null

  		if (nPlanes !== 0) {
  			dstArray = uniform.value

  			if (skipTransform !== true || dstArray === null) {
  				var flatSize = dstOffset + nPlanes * 4
  					var viewMatrix = camera.matrixWorldInverse

  				viewNormalMatrix.getNormalMatrix(viewMatrix)

  				if (dstArray === null || dstArray.length < flatSize) {
  					dstArray = new Float32Array(flatSize)
  				}

  				for (var i = 0, i4 = dstOffset; i !== nPlanes; ++i, i4 += 4) {
  					plane.copy(planes[i]).applyMatrix4(viewMatrix, viewNormalMatrix)

  					plane.normal.toArray(dstArray, i4)
  					dstArray[i4 + 3] = plane.constant
  				}
  			}

  			uniform.value = dstArray
  			uniform.needsUpdate = true
  		}

  		scope.numPlanes = nPlanes

  		return dstArray
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLExtensions (gl) {
  	var extensions = {}

  	return {

  		get: function (name) {
  			if (extensions[name] !== undefined) {
  				return extensions[name]
  			}

  			var extension

  			switch (name) {
  				case 'WEBGL_depth_texture':
  					extension = gl.getExtension('WEBGL_depth_texture') || gl.getExtension('MOZ_WEBGL_depth_texture') || gl.getExtension('WEBKIT_WEBGL_depth_texture')
  					break

  				case 'EXT_texture_filter_anisotropic':
  					extension = gl.getExtension('EXT_texture_filter_anisotropic') || gl.getExtension('MOZ_EXT_texture_filter_anisotropic') || gl.getExtension('WEBKIT_EXT_texture_filter_anisotropic')
  					break

  				case 'WEBGL_compressed_texture_s3tc':
  					extension = gl.getExtension('WEBGL_compressed_texture_s3tc') || gl.getExtension('MOZ_WEBGL_compressed_texture_s3tc') || gl.getExtension('WEBKIT_WEBGL_compressed_texture_s3tc')
  					break

  				case 'WEBGL_compressed_texture_pvrtc':
  					extension = gl.getExtension('WEBGL_compressed_texture_pvrtc') || gl.getExtension('WEBKIT_WEBGL_compressed_texture_pvrtc')
  					break

  				default:
  					extension = gl.getExtension(name)
  			}

  			if (extension === null) {
  				console.warn('THREE.WebGLRenderer: ' + name + ' extension not supported.')
  			}

  			extensions[name] = extension

  			return extension
  		}

  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLGeometries (gl, attributes, info) {
  	var geometries = {}
  	var wireframeAttributes = {}

  	function onGeometryDispose (event) {
  		var geometry = event.target
  		var buffergeometry = geometries[geometry.id]

  		if (buffergeometry.index !== null) {
  			attributes.remove(buffergeometry.index)
  		}

  		for (var name in buffergeometry.attributes) {
  			attributes.remove(buffergeometry.attributes[name])
  		}

  		geometry.removeEventListener('dispose', onGeometryDispose)

  		delete geometries[geometry.id]

  		// TODO Remove duplicate code

  		var attribute = wireframeAttributes[geometry.id]

  		if (attribute) {
  			attributes.remove(attribute)
  			delete wireframeAttributes[geometry.id]
  		}

  		attribute = wireframeAttributes[buffergeometry.id]

  		if (attribute) {
  			attributes.remove(attribute)
  			delete wireframeAttributes[buffergeometry.id]
  		}

  		//

  		info.memory.geometries--
  	}

  	function get (object, geometry) {
  		var buffergeometry = geometries[geometry.id]

  		if (buffergeometry) return buffergeometry

  		geometry.addEventListener('dispose', onGeometryDispose)

  		if (geometry.isBufferGeometry) {
  			buffergeometry = geometry
  		} else if (geometry.isGeometry) {
  			if (geometry._bufferGeometry === undefined) {
  				geometry._bufferGeometry = new BufferGeometry().setFromObject(object)
  			}

  			buffergeometry = geometry._bufferGeometry
  		}

  		geometries[geometry.id] = buffergeometry

  		info.memory.geometries++

  		return buffergeometry
  	}

  	function update (geometry) {
  		var index = geometry.index
  		var geometryAttributes = geometry.attributes

  		if (index !== null) {
  			attributes.update(index, gl.ELEMENT_ARRAY_BUFFER)
  		}

  		for (var name in geometryAttributes) {
  			attributes.update(geometryAttributes[name], gl.ARRAY_BUFFER)
  		}

  		// morph targets

  		var morphAttributes = geometry.morphAttributes

  		for (var name in morphAttributes) {
  			var array = morphAttributes[name]

  			for (var i = 0, l = array.length; i < l; i++) {
  				attributes.update(array[i], gl.ARRAY_BUFFER)
  			}
  		}
  	}

  	function getWireframeAttribute (geometry) {
  		var attribute = wireframeAttributes[geometry.id]

  		if (attribute) return attribute

  		var indices = []

  		var geometryIndex = geometry.index
  		var geometryAttributes = geometry.attributes

  		// console.time( 'wireframe' );

  		if (geometryIndex !== null) {
  			var array = geometryIndex.array

  			for (var i = 0, l = array.length; i < l; i += 3) {
  				var a = array[i + 0]
  				var b = array[i + 1]
  				var c = array[i + 2]

  				indices.push(a, b, b, c, c, a)
  			}
  		} else {
  			var array = geometryAttributes.position.array

  			for (var i = 0, l = (array.length / 3) - 1; i < l; i += 3) {
  				var a = i + 0
  				var b = i + 1
  				var c = i + 2

  				indices.push(a, b, b, c, c, a)
  			}
  		}

  		// console.timeEnd( 'wireframe' );

  		attribute = new (arrayMax(indices) > 65535 ? Uint32BufferAttribute : Uint16BufferAttribute)(indices, 1)

  		attributes.update(attribute, gl.ELEMENT_ARRAY_BUFFER)

  		wireframeAttributes[geometry.id] = attribute

  		return attribute
  	}

  	return {

  		get: get,
  		update: update,

  		getWireframeAttribute: getWireframeAttribute

  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLIndexedBufferRenderer (gl, extensions, info) {
  	var mode

  	function setMode (value) {
  		mode = value
  	}

  	var type, bytesPerElement

  	function setIndex (value) {
  		type = value.type
  		bytesPerElement = value.bytesPerElement
  	}

  	function render (start, count) {
  		gl.drawElements(mode, count, type, start * bytesPerElement)

  		info.update(count, mode)
  	}

  	function renderInstances (geometry, start, count) {
  		var extension = extensions.get('ANGLE_instanced_arrays')

  		if (extension === null) {
  			console.error('THREE.WebGLIndexedBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.')
  			return
  		}

  		extension.drawElementsInstancedANGLE(mode, count, type, start * bytesPerElement, geometry.maxInstancedCount)

  		info.update(count, mode, geometry.maxInstancedCount)
  	}

  	//

  	this.setMode = setMode
  	this.setIndex = setIndex
  	this.render = render
  	this.renderInstances = renderInstances
  }

  /**
   * @author Mugen87 / https://github.com/Mugen87
   */

  function WebGLInfo (gl) {
  	var memory = {
  		geometries: 0,
  		textures: 0
  	}

  	var render = {
  		frame: 0,
  		calls: 0,
  		triangles: 0,
  		points: 0,
  		lines: 0
  	}

  	function update (count, mode, instanceCount) {
  		instanceCount = instanceCount || 1

  		render.calls++

  		switch (mode) {
  			case gl.TRIANGLES:
  				render.triangles += instanceCount * (count / 3)
  				break

  			case gl.TRIANGLE_STRIP:
  			case gl.TRIANGLE_FAN:
  				render.triangles += instanceCount * (count - 2)
  				break

  			case gl.LINES:
  				render.lines += instanceCount * (count / 2)
  				break

  			case gl.LINE_STRIP:
  				render.lines += instanceCount * (count - 1)
  				break

  			case gl.LINE_LOOP:
  				render.lines += instanceCount * count
  				break

  			case gl.POINTS:
  				render.points += instanceCount * count
  				break

  			default:
  				console.error('THREE.WebGLInfo: Unknown draw mode:', mode)
  				break
  		}
  	}

  	function reset () {
  		render.frame++
  		render.calls = 0
  		render.triangles = 0
  		render.points = 0
  		render.lines = 0
  	}

  	return {
  		memory: memory,
  		render: render,
  		programs: null,
  		autoReset: true,
  		reset: reset,
  		update: update
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function absNumericalSort (a, b) {
  	return Math.abs(b[1]) - Math.abs(a[1])
  }

  function WebGLMorphtargets (gl) {
  	var influencesList = {}
  	var morphInfluences = new Float32Array(8)

  	function update (object, geometry, material, program) {
  		var objectInfluences = object.morphTargetInfluences

  		var length = objectInfluences.length

  		var influences = influencesList[geometry.id]

  		if (influences === undefined) {
  			// initialise list

  			influences = []

  			for (var i = 0; i < length; i++) {
  				influences[i] = [i, 0]
  			}

  			influencesList[geometry.id] = influences
  		}

  		var morphTargets = material.morphTargets && geometry.morphAttributes.position
  		var morphNormals = material.morphNormals && geometry.morphAttributes.normal

  		// Remove current morphAttributes

  		for (var i = 0; i < length; i++) {
  			var influence = influences[i]

  			if (influence[1] !== 0) {
  				if (morphTargets) geometry.removeAttribute('morphTarget' + i)
  				if (morphNormals) geometry.removeAttribute('morphNormal' + i)
  			}
  		}

  		// Collect influences

  		for (var i = 0; i < length; i++) {
  			var influence = influences[i]

  			influence[0] = i
  			influence[1] = objectInfluences[i]
  		}

  		influences.sort(absNumericalSort)

  		// Add morphAttributes

  		for (var i = 0; i < 8; i++) {
  			var influence = influences[i]

  			if (influence) {
  				var index = influence[0]
  				var value = influence[1]

  				if (value) {
  					if (morphTargets) geometry.addAttribute('morphTarget' + i, morphTargets[index])
  					if (morphNormals) geometry.addAttribute('morphNormal' + i, morphNormals[index])

  					morphInfluences[i] = value
  					continue
  				}
  			}

  			morphInfluences[i] = 0
  		}

  		program.getUniforms().setValue(gl, 'morphTargetInfluences', morphInfluences)
  	}

  	return {

  		update: update

  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLObjects (geometries, info) {
  	var updateList = {}

  	function update (object) {
  		var frame = info.render.frame

  		var geometry = object.geometry
  		var buffergeometry = geometries.get(object, geometry)

  		// Update once per frame

  		if (updateList[buffergeometry.id] !== frame) {
  			if (geometry.isGeometry) {
  				buffergeometry.updateFromObject(object)
  			}

  			geometries.update(buffergeometry)

  			updateList[buffergeometry.id] = frame
  		}

  		return buffergeometry
  	}

  	function dispose () {
  		updateList = {}
  	}

  	return {

  		update: update,
  		dispose: dispose

  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function CubeTexture (images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding) {
  	images = images !== undefined ? images : []
  	mapping = mapping !== undefined ? mapping : CubeReflectionMapping

  	Texture.call(this, images, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding)

  	this.flipY = false
  }

  CubeTexture.prototype = Object.create(Texture.prototype)
  CubeTexture.prototype.constructor = CubeTexture

  CubeTexture.prototype.isCubeTexture = true

  Object.defineProperty(CubeTexture.prototype, 'images', {

  	get: function () {
  		return this.image
  	},

  	set: function (value) {
  		this.image = value
  	}

  })

  /**
   * @author tschw
   *
   * Uniforms of a program.
   * Those form a tree structure with a special top-level container for the root,
   * which you get by calling 'new WebGLUniforms( gl, program, renderer )'.
   *
   *
   * Properties of inner nodes including the top-level container:
   *
   * .seq - array of nested uniforms
   * .map - nested uniforms by name
   *
   *
   * Methods of all nodes except the top-level container:
   *
   * .setValue( gl, value, [renderer] )
   *
   * 		uploads a uniform value(s)
   *  	the 'renderer' parameter is needed for sampler uniforms
   *
   *
   * Static methods of the top-level container (renderer factorizations):
   *
   * .upload( gl, seq, values, renderer )
   *
   * 		sets uniforms in 'seq' to 'values[id].value'
   *
   * .seqWithValue( seq, values ) : filteredSeq
   *
   * 		filters 'seq' entries with corresponding entry in values
   *
   *
   * Methods of the top-level container (renderer factorizations):
   *
   * .setValue( gl, name, value )
   *
   * 		sets uniform with  name 'name' to 'value'
   *
   * .set( gl, obj, prop )
   *
   * 		sets uniform from object and property with same name than uniform
   *
   * .setOptional( gl, obj, prop )
   *
   * 		like .set for an optional property of the object
   *
   */

  var emptyTexture = new Texture()
  var emptyCubeTexture = new CubeTexture()

  // --- Base for inner nodes (including the root) ---

  function UniformContainer () {
  	this.seq = []
  	this.map = {}
  }

  // --- Utilities ---

  // Array Caches (provide typed arrays for temporary by size)

  var arrayCacheF32 = []
  var arrayCacheI32 = []

  // Float32Array caches used for uploading Matrix uniforms

  var mat4array = new Float32Array(16)
  var mat3array = new Float32Array(9)
  var mat2array = new Float32Array(4)

  // Flattening for arrays of vectors and matrices

  function flatten (array, nBlocks, blockSize) {
  	var firstElem = array[0]

  	if (firstElem <= 0 || firstElem > 0) return array
  	// unoptimized: ! isNaN( firstElem )
  	// see http://jacksondunstan.com/articles/983

  	var n = nBlocks * blockSize
  		var r = arrayCacheF32[n]

  	if (r === undefined) {
  		r = new Float32Array(n)
  		arrayCacheF32[n] = r
  	}

  	if (nBlocks !== 0) {
  		firstElem.toArray(r, 0)

  		for (var i = 1, offset = 0; i !== nBlocks; ++i) {
  			offset += blockSize
  			array[i].toArray(r, offset)
  		}
  	}

  	return r
  }

  function arraysEqual (a, b) {
  	if (a.length !== b.length) return false

  	for (var i = 0, l = a.length; i < l; i++) {
  		if (a[i] !== b[i]) return false
  	}

  	return true
  }

  function copyArray (a, b) {
  	for (var i = 0, l = b.length; i < l; i++) {
  		a[i] = b[i]
  	}
  }

  // Texture unit allocation

  function allocTexUnits (renderer, n) {
  	var r = arrayCacheI32[n]

  	if (r === undefined) {
  		r = new Int32Array(n)
  		arrayCacheI32[n] = r
  	}

  	for (var i = 0; i !== n; ++i) { r[i] = renderer.allocTextureUnit() }

  	return r
  }

  // --- Setters ---

  // Note: Defining these methods externally, because they come in a bunch
  // and this way their names minify.

  // Single scalar

  function setValue1f (gl, v) {
  	var cache = this.cache

  	if (cache[0] === v) return

  	gl.uniform1f(this.addr, v)

  	cache[0] = v
  }

  function setValue1i (gl, v) {
  	var cache = this.cache

  	if (cache[0] === v) return

  	gl.uniform1i(this.addr, v)

  	cache[0] = v
  }

  // Single float vector (from flat array or THREE.VectorN)

  function setValue2fv (gl, v) {
  	var cache = this.cache

  	if (v.x !== undefined) {
  		if (cache[0] !== v.x || cache[1] !== v.y) {
  			gl.uniform2f(this.addr, v.x, v.y)

  			cache[0] = v.x
  			cache[1] = v.y
  		}
  	} else {
  		if (arraysEqual(cache, v)) return

  		gl.uniform2fv(this.addr, v)

  		copyArray(cache, v)
  	}
  }

  function setValue3fv (gl, v) {
  	var cache = this.cache

  	if (v.x !== undefined) {
  		if (cache[0] !== v.x || cache[1] !== v.y || cache[2] !== v.z) {
  			gl.uniform3f(this.addr, v.x, v.y, v.z)

  			cache[0] = v.x
  			cache[1] = v.y
  			cache[2] = v.z
  		}
  	} else if (v.r !== undefined) {
  		if (cache[0] !== v.r || cache[1] !== v.g || cache[2] !== v.b) {
  			gl.uniform3f(this.addr, v.r, v.g, v.b)

  			cache[0] = v.r
  			cache[1] = v.g
  			cache[2] = v.b
  		}
  	} else {
  		if (arraysEqual(cache, v)) return

  		gl.uniform3fv(this.addr, v)

  		copyArray(cache, v)
  	}
  }

  function setValue4fv (gl, v) {
  	var cache = this.cache

  	if (v.x !== undefined) {
  		if (cache[0] !== v.x || cache[1] !== v.y || cache[2] !== v.z || cache[3] !== v.w) {
  			gl.uniform4f(this.addr, v.x, v.y, v.z, v.w)

  			cache[0] = v.x
  			cache[1] = v.y
  			cache[2] = v.z
  			cache[3] = v.w
  		}
  	} else {
  		if (arraysEqual(cache, v)) return

  		gl.uniform4fv(this.addr, v)

  		copyArray(cache, v)
  	}
  }

  // Single matrix (from flat array or MatrixN)

  function setValue2fm (gl, v) {
  	var cache = this.cache
  	var elements = v.elements

  	if (elements === undefined) {
  		if (arraysEqual(cache, v)) return

  		gl.uniformMatrix2fv(this.addr, false, v)

  		copyArray(cache, v)
  	} else {
  		if (arraysEqual(cache, elements)) return

  		mat2array.set(elements)

  		gl.uniformMatrix2fv(this.addr, false, mat2array)

  		copyArray(cache, elements)
  	}
  }

  function setValue3fm (gl, v) {
  	var cache = this.cache
  	var elements = v.elements

  	if (elements === undefined) {
  		if (arraysEqual(cache, v)) return

  		gl.uniformMatrix3fv(this.addr, false, v)

  		copyArray(cache, v)
  	} else {
  		if (arraysEqual(cache, elements)) return

  		mat3array.set(elements)

  		gl.uniformMatrix3fv(this.addr, false, mat3array)

  		copyArray(cache, elements)
  	}
  }

  function setValue4fm (gl, v) {
  	var cache = this.cache
  	var elements = v.elements

  	if (elements === undefined) {
  		if (arraysEqual(cache, v)) return

  		gl.uniformMatrix4fv(this.addr, false, v)

  		copyArray(cache, v)
  	} else {
  		if (arraysEqual(cache, elements)) return

  		mat4array.set(elements)

  		gl.uniformMatrix4fv(this.addr, false, mat4array)

  		copyArray(cache, elements)
  	}
  }

  // Single texture (2D / Cube)

  function setValueT1 (gl, v, renderer) {
  	var cache = this.cache
  	var unit = renderer.allocTextureUnit()

  	if (cache[0] !== unit) {
  		gl.uniform1i(this.addr, unit)
  		cache[0] = unit
  	}

  	renderer.setTexture2D(v || emptyTexture, unit)
  }

  function setValueT6 (gl, v, renderer) {
  	var cache = this.cache
  	var unit = renderer.allocTextureUnit()

  	if (cache[0] !== unit) {
  		gl.uniform1i(this.addr, unit)
  		cache[0] = unit
  	}

  	renderer.setTextureCube(v || emptyCubeTexture, unit)
  }

  // Integer / Boolean vectors or arrays thereof (always flat arrays)

  function setValue2iv (gl, v) {
  	var cache = this.cache

  	if (arraysEqual(cache, v)) return

  	gl.uniform2iv(this.addr, v)

  	copyArray(cache, v)
  }

  function setValue3iv (gl, v) {
  	var cache = this.cache

  	if (arraysEqual(cache, v)) return

  	gl.uniform3iv(this.addr, v)

  	copyArray(cache, v)
  }

  function setValue4iv (gl, v) {
  	var cache = this.cache

  	if (arraysEqual(cache, v)) return

  	gl.uniform4iv(this.addr, v)

  	copyArray(cache, v)
  }

  // Helper to pick the right setter for the singular case

  function getSingularSetter (type) {
  	switch (type) {
  		case 0x1406: return setValue1f // FLOAT
  		case 0x8b50: return setValue2fv // _VEC2
  		case 0x8b51: return setValue3fv // _VEC3
  		case 0x8b52: return setValue4fv // _VEC4

  		case 0x8b5a: return setValue2fm // _MAT2
  		case 0x8b5b: return setValue3fm // _MAT3
  		case 0x8b5c: return setValue4fm // _MAT4

  		case 0x8b5e: case 0x8d66: return setValueT1 // SAMPLER_2D, SAMPLER_EXTERNAL_OES
  		case 0x8b60: return setValueT6 // SAMPLER_CUBE

  		case 0x1404: case 0x8b56: return setValue1i // INT, BOOL
  		case 0x8b53: case 0x8b57: return setValue2iv // _VEC2
  		case 0x8b54: case 0x8b58: return setValue3iv // _VEC3
  		case 0x8b55: case 0x8b59: return setValue4iv // _VEC4
  	}
  }

  // Array of scalars

  function setValue1fv (gl, v) {
  	var cache = this.cache

  	if (arraysEqual(cache, v)) return

  	gl.uniform1fv(this.addr, v)

  	copyArray(cache, v)
  }
  function setValue1iv (gl, v) {
  	var cache = this.cache

  	if (arraysEqual(cache, v)) return

  	gl.uniform1iv(this.addr, v)

  	copyArray(cache, v)
  }

  // Array of vectors (flat or from THREE classes)

  function setValueV2a (gl, v) {
  	var cache = this.cache
  	var data = flatten(v, this.size, 2)

  	if (arraysEqual(cache, data)) return

  	gl.uniform2fv(this.addr, data)

  	this.updateCache(data)
  }

  function setValueV3a (gl, v) {
  	var cache = this.cache
  	var data = flatten(v, this.size, 3)

  	if (arraysEqual(cache, data)) return

  	gl.uniform3fv(this.addr, data)

  	this.updateCache(data)
  }

  function setValueV4a (gl, v) {
  	var cache = this.cache
  	var data = flatten(v, this.size, 4)

  	if (arraysEqual(cache, data)) return

  	gl.uniform4fv(this.addr, data)

  	this.updateCache(data)
  }

  // Array of matrices (flat or from THREE clases)

  function setValueM2a (gl, v) {
  	var cache = this.cache
  	var data = flatten(v, this.size, 4)

  	if (arraysEqual(cache, data)) return

  	gl.uniformMatrix2fv(this.addr, false, data)

  	this.updateCache(data)
  }

  function setValueM3a (gl, v) {
  	var cache = this.cache
  	var data = flatten(v, this.size, 9)

  	if (arraysEqual(cache, data)) return

  	gl.uniformMatrix3fv(this.addr, false, data)

  	this.updateCache(data)
  }

  function setValueM4a (gl, v) {
  	var cache = this.cache
  	var data = flatten(v, this.size, 16)

  	if (arraysEqual(cache, data)) return

  	gl.uniformMatrix4fv(this.addr, false, data)

  	this.updateCache(data)
  }

  // Array of textures (2D / Cube)

  function setValueT1a (gl, v, renderer) {
  	var cache = this.cache
  	var n = v.length

  	var units = allocTexUnits(renderer, n)

  	if (arraysEqual(cache, units) === false) {
  		gl.uniform1iv(this.addr, units)
  		copyArray(cache, units)
  	}

  	for (var i = 0; i !== n; ++i) {
  		renderer.setTexture2D(v[i] || emptyTexture, units[i])
  	}
  }

  function setValueT6a (gl, v, renderer) {
  	var cache = this.cache
  	var n = v.length

  	var units = allocTexUnits(renderer, n)

  	if (arraysEqual(cache, units) === false) {
  		gl.uniform1iv(this.addr, units)
  		copyArray(cache, units)
  	}

  	for (var i = 0; i !== n; ++i) {
  		renderer.setTextureCube(v[i] || emptyCubeTexture, units[i])
  	}
  }

  // Helper to pick the right setter for a pure (bottom-level) array

  function getPureArraySetter (type) {
  	switch (type) {
  		case 0x1406: return setValue1fv // FLOAT
  		case 0x8b50: return setValueV2a // _VEC2
  		case 0x8b51: return setValueV3a // _VEC3
  		case 0x8b52: return setValueV4a // _VEC4

  		case 0x8b5a: return setValueM2a // _MAT2
  		case 0x8b5b: return setValueM3a // _MAT3
  		case 0x8b5c: return setValueM4a // _MAT4

  		case 0x8b5e: return setValueT1a // SAMPLER_2D
  		case 0x8b60: return setValueT6a // SAMPLER_CUBE

  		case 0x1404: case 0x8b56: return setValue1iv // INT, BOOL
  		case 0x8b53: case 0x8b57: return setValue2iv // _VEC2
  		case 0x8b54: case 0x8b58: return setValue3iv // _VEC3
  		case 0x8b55: case 0x8b59: return setValue4iv // _VEC4
  	}
  }

  // --- Uniform Classes ---

  function SingleUniform (id, activeInfo, addr) {
  	this.id = id
  	this.addr = addr
  	this.cache = []
  	this.setValue = getSingularSetter(activeInfo.type)

  	// this.path = activeInfo.name; // DEBUG
  }

  function PureArrayUniform (id, activeInfo, addr) {
  	this.id = id
  	this.addr = addr
  	this.cache = []
  	this.size = activeInfo.size
  	this.setValue = getPureArraySetter(activeInfo.type)

  	// this.path = activeInfo.name; // DEBUG
  }

  PureArrayUniform.prototype.updateCache = function (data) {
  	var cache = this.cache

  	if (data instanceof Float32Array && cache.length !== data.length) {
  		this.cache = new Float32Array(data.length)
  	}

  	copyArray(cache, data)
  }

  function StructuredUniform (id) {
  	this.id = id

  	UniformContainer.call(this) // mix-in
  }

  StructuredUniform.prototype.setValue = function (gl, value) {
  	// Note: Don't need an extra 'renderer' parameter, since samplers
  	// are not allowed in structured uniforms.

  	var seq = this.seq

  	for (var i = 0, n = seq.length; i !== n; ++i) {
  		var u = seq[i]
  		u.setValue(gl, value[u.id])
  	}
  }

  // --- Top-level ---

  // Parser - builds up the property tree from the path strings

  var RePathPart = /([\w\d_]+)(\])?(\[|\.)?/g

  // extracts
  // 	- the identifier (member name or array index)
  //  - followed by an optional right bracket (found when array index)
  //  - followed by an optional left bracket or dot (type of subscript)
  //
  // Note: These portions can be read in a non-overlapping fashion and
  // allow straightforward parsing of the hierarchy that WebGL encodes
  // in the uniform names.

  function addUniform (container, uniformObject) {
  	container.seq.push(uniformObject)
  	container.map[uniformObject.id] = uniformObject
  }

  function parseUniform (activeInfo, addr, container) {
  	var path = activeInfo.name
  		var pathLength = path.length

  	// reset RegExp object, because of the early exit of a previous run
  	RePathPart.lastIndex = 0

  	while (true) {
  		var match = RePathPart.exec(path)
  			var matchEnd = RePathPart.lastIndex

  			var id = match[1]
  			var idIsIndex = match[2] === ']'
  			var subscript = match[3]

  		if (idIsIndex) id = id | 0 // convert to integer

  		if (subscript === undefined || subscript === '[' && matchEnd + 2 === pathLength) {
  			// bare name or "pure" bottom-level array "[0]" suffix

  			addUniform(container, subscript === undefined
  				? new SingleUniform(id, activeInfo, addr)
  				: new PureArrayUniform(id, activeInfo, addr))

  			break
  		} else {
  			// step into inner node / create it in case it doesn't exist

  			var map = container.map; var next = map[id]

  			if (next === undefined) {
  				next = new StructuredUniform(id)
  				addUniform(container, next)
  			}

  			container = next
  		}
  	}
  }

  // Root Container

  function WebGLUniforms (gl, program, renderer) {
  	UniformContainer.call(this)

  	this.renderer = renderer

  	var n = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS)

  	for (var i = 0; i < n; ++i) {
  		var info = gl.getActiveUniform(program, i)
  			var addr = gl.getUniformLocation(program, info.name)

  		parseUniform(info, addr, this)
  	}
  }

  WebGLUniforms.prototype.setValue = function (gl, name, value) {
  	var u = this.map[name]

  	if (u !== undefined) u.setValue(gl, value, this.renderer)
  }

  WebGLUniforms.prototype.setOptional = function (gl, object, name) {
  	var v = object[name]

  	if (v !== undefined) this.setValue(gl, name, v)
  }

  // Static interface

  WebGLUniforms.upload = function (gl, seq, values, renderer) {
  	for (var i = 0, n = seq.length; i !== n; ++i) {
  		var u = seq[i]
  			var v = values[u.id]

  		if (v.needsUpdate !== false) {
  			// note: always updating when .needsUpdate is undefined
  			u.setValue(gl, v.value, renderer)
  		}
  	}
  }

  WebGLUniforms.seqWithValue = function (seq, values) {
  	var r = []

  	for (var i = 0, n = seq.length; i !== n; ++i) {
  		var u = seq[i]
  		if (u.id in values) r.push(u)
  	}

  	return r
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function addLineNumbers (string) {
  	var lines = string.split('\n')

  	for (var i = 0; i < lines.length; i++) {
  		lines[i] = (i + 1) + ': ' + lines[i]
  	}

  	return lines.join('\n')
  }

  function WebGLShader (gl, type, string) {
  	var shader = gl.createShader(type)

  	gl.shaderSource(shader, string)
  	gl.compileShader(shader)

  	if (gl.getShaderParameter(shader, gl.COMPILE_STATUS) === false) {
  		console.error('THREE.WebGLShader: Shader couldn\'t compile.')
  	}

  	if (gl.getShaderInfoLog(shader) !== '') {
  		console.warn('THREE.WebGLShader: gl.getShaderInfoLog()', type === gl.VERTEX_SHADER ? 'vertex' : 'fragment', gl.getShaderInfoLog(shader), addLineNumbers(string))
  	}

  	// --enable-privileged-webgl-extension
  	// console.log( type, gl.getExtension( 'WEBGL_debug_shaders' ).getTranslatedShaderSource( shader ) );

  	return shader
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  var programIdCount = 0

  function getEncodingComponents (encoding) {
  	switch (encoding) {
  		case LinearEncoding:
  			return ['Linear', '( value )']
  		case sRGBEncoding:
  			return ['sRGB', '( value )']
  		case RGBEEncoding:
  			return ['RGBE', '( value )']
  		case RGBM7Encoding:
  			return ['RGBM', '( value, 7.0 )']
  		case RGBM16Encoding:
  			return ['RGBM', '( value, 16.0 )']
  		case RGBDEncoding:
  			return ['RGBD', '( value, 256.0 )']
  		case GammaEncoding:
  			return ['Gamma', '( value, float( GAMMA_FACTOR ) )']
  		default:
  			throw new Error('unsupported encoding: ' + encoding)
  	}
  }

  function getTexelDecodingFunction (functionName, encoding) {
  	var components = getEncodingComponents(encoding)
  	return 'vec4 ' + functionName + '( vec4 value ) { return ' + components[0] + 'ToLinear' + components[1] + '; }'
  }

  function getTexelEncodingFunction (functionName, encoding) {
  	var components = getEncodingComponents(encoding)
  	return 'vec4 ' + functionName + '( vec4 value ) { return LinearTo' + components[0] + components[1] + '; }'
  }

  function getToneMappingFunction (functionName, toneMapping) {
  	var toneMappingName

  	switch (toneMapping) {
  		case LinearToneMapping:
  			toneMappingName = 'Linear'
  			break

  		case ReinhardToneMapping:
  			toneMappingName = 'Reinhard'
  			break

  		case Uncharted2ToneMapping:
  			toneMappingName = 'Uncharted2'
  			break

  		case CineonToneMapping:
  			toneMappingName = 'OptimizedCineon'
  			break

  		default:
  			throw new Error('unsupported toneMapping: ' + toneMapping)
  	}

  	return 'vec3 ' + functionName + '( vec3 color ) { return ' + toneMappingName + 'ToneMapping( color ); }'
  }

  function generateExtensions (extensions, parameters, rendererExtensions) {
  	extensions = extensions || {}

  	var chunks = [
  		(extensions.derivatives || parameters.envMapCubeUV || parameters.bumpMap || parameters.normalMap || parameters.flatShading) ? '#extension GL_OES_standard_derivatives : enable' : '',
  		(extensions.fragDepth || parameters.logarithmicDepthBuffer) && rendererExtensions.get('EXT_frag_depth') ? '#extension GL_EXT_frag_depth : enable' : '',
  		(extensions.drawBuffers) && rendererExtensions.get('WEBGL_draw_buffers') ? '#extension GL_EXT_draw_buffers : require' : '',
  		(extensions.shaderTextureLOD || parameters.envMap) && rendererExtensions.get('EXT_shader_texture_lod') ? '#extension GL_EXT_shader_texture_lod : enable' : ''
  	]

  	return chunks.filter(filterEmptyLine).join('\n')
  }

  function generateDefines (defines) {
  	var chunks = []

  	for (var name in defines) {
  		var value = defines[name]

  		if (value === false) continue

  		chunks.push('#define ' + name + ' ' + value)
  	}

  	return chunks.join('\n')
  }

  function fetchAttributeLocations (gl, program) {
  	var attributes = {}

  	var n = gl.getProgramParameter(program, gl.ACTIVE_ATTRIBUTES)

  	for (var i = 0; i < n; i++) {
  		var info = gl.getActiveAttrib(program, i)
  		var name = info.name

  		// console.log( 'THREE.WebGLProgram: ACTIVE VERTEX ATTRIBUTE:', name, i );

  		attributes[name] = gl.getAttribLocation(program, name)
  	}

  	return attributes
  }

  function filterEmptyLine (string) {
  	return string !== ''
  }

  function replaceLightNums (string, parameters) {
  	return string
  		.replace(/NUM_DIR_LIGHTS/g, parameters.numDirLights)
  		.replace(/NUM_SPOT_LIGHTS/g, parameters.numSpotLights)
  		.replace(/NUM_RECT_AREA_LIGHTS/g, parameters.numRectAreaLights)
  		.replace(/NUM_POINT_LIGHTS/g, parameters.numPointLights)
  		.replace(/NUM_HEMI_LIGHTS/g, parameters.numHemiLights)
  }

  function replaceClippingPlaneNums (string, parameters) {
  	return string
  		.replace(/NUM_CLIPPING_PLANES/g, parameters.numClippingPlanes)
  		.replace(/UNION_CLIPPING_PLANES/g, (parameters.numClippingPlanes - parameters.numClipIntersection))
  }

  function parseIncludes (string) {
  	var pattern = /^[ \t]*#include +<([\w\d.]+)>/gm

  	function replace (match, include) {
  		var replace = ShaderChunk[include]

  		if (replace === undefined) {
  			throw new Error('Can not resolve #include <' + include + '>')
  		}

  		return parseIncludes(replace)
  	}

  	return string.replace(pattern, replace)
  }

  function unrollLoops (string) {
  	var pattern = /#pragma unroll_loop[\s]+?for \( int i \= (\d+)\; i < (\d+)\; i \+\+ \) \{([\s\S]+?)(?=\})\}/g

  	function replace (match, start, end, snippet) {
  		var unroll = ''

  		for (var i = parseInt(start); i < parseInt(end); i++) {
  			unroll += snippet.replace(/\[ i \]/g, '[ ' + i + ' ]')
  		}

  		return unroll
  	}

  	return string.replace(pattern, replace)
  }

  function WebGLProgram (renderer, extensions, code, material, shader, parameters) {
  	var gl = renderer.context

  	var defines = material.defines

  	var vertexShader = shader.vertexShader
  	var fragmentShader = shader.fragmentShader

  	var shadowMapTypeDefine = 'SHADOWMAP_TYPE_BASIC'

  	if (parameters.shadowMapType === PCFShadowMap) {
  		shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF'
  	} else if (parameters.shadowMapType === PCFSoftShadowMap) {
  		shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF_SOFT'
  	}

  	var envMapTypeDefine = 'ENVMAP_TYPE_CUBE'
  	var envMapModeDefine = 'ENVMAP_MODE_REFLECTION'
  	var envMapBlendingDefine = 'ENVMAP_BLENDING_MULTIPLY'

  	if (parameters.envMap) {
  		switch (material.envMap.mapping) {
  			case CubeReflectionMapping:
  			case CubeRefractionMapping:
  				envMapTypeDefine = 'ENVMAP_TYPE_CUBE'
  				break

  			case CubeUVReflectionMapping:
  			case CubeUVRefractionMapping:
  				envMapTypeDefine = 'ENVMAP_TYPE_CUBE_UV'
  				break

  			case EquirectangularReflectionMapping:
  			case EquirectangularRefractionMapping:
  				envMapTypeDefine = 'ENVMAP_TYPE_EQUIREC'
  				break

  			case SphericalReflectionMapping:
  				envMapTypeDefine = 'ENVMAP_TYPE_SPHERE'
  				break
  		}

  		switch (material.envMap.mapping) {
  			case CubeRefractionMapping:
  			case EquirectangularRefractionMapping:
  				envMapModeDefine = 'ENVMAP_MODE_REFRACTION'
  				break
  		}

  		switch (material.combine) {
  			case MultiplyOperation:
  				envMapBlendingDefine = 'ENVMAP_BLENDING_MULTIPLY'
  				break

  			case MixOperation:
  				envMapBlendingDefine = 'ENVMAP_BLENDING_MIX'
  				break

  			case AddOperation:
  				envMapBlendingDefine = 'ENVMAP_BLENDING_ADD'
  				break
  		}
  	}

  	var gammaFactorDefine = (renderer.gammaFactor > 0) ? renderer.gammaFactor : 1.0

  	// console.log( 'building new program ' );

  	//

  	var customExtensions = generateExtensions(material.extensions, parameters, extensions)

  	var customDefines = generateDefines(defines)

  	//

  	var program = gl.createProgram()

  	var prefixVertex, prefixFragment

  	if (material.isRawShaderMaterial) {
  		prefixVertex = [

  			customDefines

  		].filter(filterEmptyLine).join('\n')

  		if (prefixVertex.length > 0) {
  			prefixVertex += '\n'
  		}

  		prefixFragment = [

  			customExtensions,
  			customDefines

  		].filter(filterEmptyLine).join('\n')

  		if (prefixFragment.length > 0) {
  			prefixFragment += '\n'
  		}
  	} else {
  		prefixVertex = [

  			'precision ' + parameters.precision + ' float;',
  			'precision ' + parameters.precision + ' int;',

  			'#define SHADER_NAME ' + shader.name,

  			customDefines,

  			parameters.supportsVertexTextures ? '#define VERTEX_TEXTURES' : '',

  			'#define GAMMA_FACTOR ' + gammaFactorDefine,

  			'#define MAX_BONES ' + parameters.maxBones,
  			(parameters.useFog && parameters.fog) ? '#define USE_FOG' : '',
  			(parameters.useFog && parameters.fogExp) ? '#define FOG_EXP2' : '',

  			parameters.map ? '#define USE_MAP' : '',
  			parameters.envMap ? '#define USE_ENVMAP' : '',
  			parameters.envMap ? '#define ' + envMapModeDefine : '',
  			parameters.lightMap ? '#define USE_LIGHTMAP' : '',
  			parameters.aoMap ? '#define USE_AOMAP' : '',
  			parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',
  			parameters.bumpMap ? '#define USE_BUMPMAP' : '',
  			parameters.normalMap ? '#define USE_NORMALMAP' : '',
  			parameters.displacementMap && parameters.supportsVertexTextures ? '#define USE_DISPLACEMENTMAP' : '',
  			parameters.specularMap ? '#define USE_SPECULARMAP' : '',
  			parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
  			parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
  			parameters.alphaMap ? '#define USE_ALPHAMAP' : '',
  			parameters.vertexColors ? '#define USE_COLOR' : '',

  			parameters.flatShading ? '#define FLAT_SHADED' : '',

  			parameters.skinning ? '#define USE_SKINNING' : '',
  			parameters.useVertexTexture ? '#define BONE_TEXTURE' : '',

  			parameters.morphTargets ? '#define USE_MORPHTARGETS' : '',
  			parameters.morphNormals && parameters.flatShading === false ? '#define USE_MORPHNORMALS' : '',
  			parameters.doubleSided ? '#define DOUBLE_SIDED' : '',
  			parameters.flipSided ? '#define FLIP_SIDED' : '',

  			parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',
  			parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',

  			parameters.sizeAttenuation ? '#define USE_SIZEATTENUATION' : '',

  			parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',
  			parameters.logarithmicDepthBuffer && extensions.get('EXT_frag_depth') ? '#define USE_LOGDEPTHBUF_EXT' : '',

  			'uniform mat4 modelMatrix;',
  			'uniform mat4 modelViewMatrix;',
  			'uniform mat4 projectionMatrix;',
  			'uniform mat4 viewMatrix;',
  			'uniform mat3 normalMatrix;',
  			'uniform vec3 cameraPosition;',

  			'attribute vec3 position;',
  			'attribute vec3 normal;',
  			'attribute vec2 uv;',

  			'#ifdef USE_COLOR',

  			'	attribute vec3 color;',

  			'#endif',

  			'#ifdef USE_MORPHTARGETS',

  			'	attribute vec3 morphTarget0;',
  			'	attribute vec3 morphTarget1;',
  			'	attribute vec3 morphTarget2;',
  			'	attribute vec3 morphTarget3;',

  			'	#ifdef USE_MORPHNORMALS',

  			'		attribute vec3 morphNormal0;',
  			'		attribute vec3 morphNormal1;',
  			'		attribute vec3 morphNormal2;',
  			'		attribute vec3 morphNormal3;',

  			'	#else',

  			'		attribute vec3 morphTarget4;',
  			'		attribute vec3 morphTarget5;',
  			'		attribute vec3 morphTarget6;',
  			'		attribute vec3 morphTarget7;',

  			'	#endif',

  			'#endif',

  			'#ifdef USE_SKINNING',

  			'	attribute vec4 skinIndex;',
  			'	attribute vec4 skinWeight;',

  			'#endif',

  			'\n'

  		].filter(filterEmptyLine).join('\n')

  		prefixFragment = [

  			customExtensions,

  			'precision ' + parameters.precision + ' float;',
  			'precision ' + parameters.precision + ' int;',

  			'#define SHADER_NAME ' + shader.name,

  			customDefines,

  			parameters.alphaTest ? '#define ALPHATEST ' + parameters.alphaTest + (parameters.alphaTest % 1 ? '' : '.0') : '', // add '.0' if integer

  			'#define GAMMA_FACTOR ' + gammaFactorDefine,

  			(parameters.useFog && parameters.fog) ? '#define USE_FOG' : '',
  			(parameters.useFog && parameters.fogExp) ? '#define FOG_EXP2' : '',

  			parameters.map ? '#define USE_MAP' : '',
  			parameters.envMap ? '#define USE_ENVMAP' : '',
  			parameters.envMap ? '#define ' + envMapTypeDefine : '',
  			parameters.envMap ? '#define ' + envMapModeDefine : '',
  			parameters.envMap ? '#define ' + envMapBlendingDefine : '',
  			parameters.lightMap ? '#define USE_LIGHTMAP' : '',
  			parameters.aoMap ? '#define USE_AOMAP' : '',
  			parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',
  			parameters.bumpMap ? '#define USE_BUMPMAP' : '',
  			parameters.normalMap ? '#define USE_NORMALMAP' : '',
  			parameters.specularMap ? '#define USE_SPECULARMAP' : '',
  			parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
  			parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
  			parameters.alphaMap ? '#define USE_ALPHAMAP' : '',
  			parameters.vertexColors ? '#define USE_COLOR' : '',

  			parameters.gradientMap ? '#define USE_GRADIENTMAP' : '',

  			parameters.flatShading ? '#define FLAT_SHADED' : '',

  			parameters.doubleSided ? '#define DOUBLE_SIDED' : '',
  			parameters.flipSided ? '#define FLIP_SIDED' : '',

  			parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',
  			parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',

  			parameters.premultipliedAlpha ? '#define PREMULTIPLIED_ALPHA' : '',

  			parameters.physicallyCorrectLights ? '#define PHYSICALLY_CORRECT_LIGHTS' : '',

  			parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',
  			parameters.logarithmicDepthBuffer && extensions.get('EXT_frag_depth') ? '#define USE_LOGDEPTHBUF_EXT' : '',

  			parameters.envMap && extensions.get('EXT_shader_texture_lod') ? '#define TEXTURE_LOD_EXT' : '',

  			'uniform mat4 viewMatrix;',
  			'uniform vec3 cameraPosition;',

  			(parameters.toneMapping !== NoToneMapping) ? '#define TONE_MAPPING' : '',
  			(parameters.toneMapping !== NoToneMapping) ? ShaderChunk.tonemapping_pars_fragment : '', // this code is required here because it is used by the toneMapping() function defined below
  			(parameters.toneMapping !== NoToneMapping) ? getToneMappingFunction('toneMapping', parameters.toneMapping) : '',

  			parameters.dithering ? '#define DITHERING' : '',

  			(parameters.outputEncoding || parameters.mapEncoding || parameters.envMapEncoding || parameters.emissiveMapEncoding) ? ShaderChunk.encodings_pars_fragment : '', // this code is required here because it is used by the various encoding/decoding function defined below
  			parameters.mapEncoding ? getTexelDecodingFunction('mapTexelToLinear', parameters.mapEncoding) : '',
  			parameters.envMapEncoding ? getTexelDecodingFunction('envMapTexelToLinear', parameters.envMapEncoding) : '',
  			parameters.emissiveMapEncoding ? getTexelDecodingFunction('emissiveMapTexelToLinear', parameters.emissiveMapEncoding) : '',
  			parameters.outputEncoding ? getTexelEncodingFunction('linearToOutputTexel', parameters.outputEncoding) : '',

  			parameters.depthPacking ? '#define DEPTH_PACKING ' + material.depthPacking : '',

  			'\n'

  		].filter(filterEmptyLine).join('\n')
  	}

  	vertexShader = parseIncludes(vertexShader)
  	vertexShader = replaceLightNums(vertexShader, parameters)
  	vertexShader = replaceClippingPlaneNums(vertexShader, parameters)

  	fragmentShader = parseIncludes(fragmentShader)
  	fragmentShader = replaceLightNums(fragmentShader, parameters)
  	fragmentShader = replaceClippingPlaneNums(fragmentShader, parameters)

  	vertexShader = unrollLoops(vertexShader)
  	fragmentShader = unrollLoops(fragmentShader)

  	var vertexGlsl = prefixVertex + vertexShader
  	var fragmentGlsl = prefixFragment + fragmentShader

  	// console.log( '*VERTEX*', vertexGlsl );
  	// console.log( '*FRAGMENT*', fragmentGlsl );

  	var glVertexShader = WebGLShader(gl, gl.VERTEX_SHADER, vertexGlsl)
  	var glFragmentShader = WebGLShader(gl, gl.FRAGMENT_SHADER, fragmentGlsl)

  	gl.attachShader(program, glVertexShader)
  	gl.attachShader(program, glFragmentShader)

  	// Force a particular attribute to index 0.

  	if (material.index0AttributeName !== undefined) {
  		gl.bindAttribLocation(program, 0, material.index0AttributeName)
  	} else if (parameters.morphTargets === true) {
  		// programs with morphTargets displace position out of attribute 0
  		gl.bindAttribLocation(program, 0, 'position')
  	}

  	gl.linkProgram(program)

  	var programLog = gl.getProgramInfoLog(program).trim()
  	var vertexLog = gl.getShaderInfoLog(glVertexShader).trim()
  	var fragmentLog = gl.getShaderInfoLog(glFragmentShader).trim()

  	var runnable = true
  	var haveDiagnostics = true

  	// console.log( '**VERTEX**', gl.getExtension( 'WEBGL_debug_shaders' ).getTranslatedShaderSource( glVertexShader ) );
  	// console.log( '**FRAGMENT**', gl.getExtension( 'WEBGL_debug_shaders' ).getTranslatedShaderSource( glFragmentShader ) );

  	if (gl.getProgramParameter(program, gl.LINK_STATUS) === false) {
  		runnable = false

  		console.error('THREE.WebGLProgram: shader error: ', gl.getError(), 'gl.VALIDATE_STATUS', gl.getProgramParameter(program, gl.VALIDATE_STATUS), 'gl.getProgramInfoLog', programLog, vertexLog, fragmentLog)
  	} else if (programLog !== '') {
  		console.warn('THREE.WebGLProgram: gl.getProgramInfoLog()', programLog)
  	} else if (vertexLog === '' || fragmentLog === '') {
  		haveDiagnostics = false
  	}

  	if (haveDiagnostics) {
  		this.diagnostics = {

  			runnable: runnable,
  			material: material,

  			programLog: programLog,

  			vertexShader: {

  				log: vertexLog,
  				prefix: prefixVertex

  			},

  			fragmentShader: {

  				log: fragmentLog,
  				prefix: prefixFragment

  			}

  		}
  	}

  	// clean up

  	gl.deleteShader(glVertexShader)
  	gl.deleteShader(glFragmentShader)

  	// set up caching for uniform locations

  	var cachedUniforms

  	this.getUniforms = function () {
  		if (cachedUniforms === undefined) {
  			cachedUniforms = new WebGLUniforms(gl, program, renderer)
  		}

  		return cachedUniforms
  	}

  	// set up caching for attribute locations

  	var cachedAttributes

  	this.getAttributes = function () {
  		if (cachedAttributes === undefined) {
  			cachedAttributes = fetchAttributeLocations(gl, program)
  		}

  		return cachedAttributes
  	}

  	// free resource

  	this.destroy = function () {
  		gl.deleteProgram(program)
  		this.program = undefined
  	}

  	// DEPRECATED

  	Object.defineProperties(this, {

  		uniforms: {
  			get: function () {
  				console.warn('THREE.WebGLProgram: .uniforms is now .getUniforms().')
  				return this.getUniforms()
  			}
  		},

  		attributes: {
  			get: function () {
  				console.warn('THREE.WebGLProgram: .attributes is now .getAttributes().')
  				return this.getAttributes()
  			}
  		}

  	})

  	//

  	this.name = shader.name
  	this.id = programIdCount++
  	this.code = code
  	this.usedTimes = 1
  	this.program = program
  	this.vertexShader = glVertexShader
  	this.fragmentShader = glFragmentShader

  	return this
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLPrograms (renderer, extensions, capabilities) {
  	var programs = []

  	var shaderIDs = {
  		MeshDepthMaterial: 'depth',
  		MeshDistanceMaterial: 'distanceRGBA',
  		MeshNormalMaterial: 'normal',
  		MeshBasicMaterial: 'basic',
  		MeshLambertMaterial: 'lambert',
  		MeshPhongMaterial: 'phong',
  		MeshToonMaterial: 'phong',
  		MeshStandardMaterial: 'physical',
  		MeshPhysicalMaterial: 'physical',
  		LineBasicMaterial: 'basic',
  		LineDashedMaterial: 'dashed',
  		PointsMaterial: 'points',
  		ShadowMaterial: 'shadow'
  	}

  	var parameterNames = [
  		'precision', 'supportsVertexTextures', 'map', 'mapEncoding', 'envMap', 'envMapMode', 'envMapEncoding',
  		'lightMap', 'aoMap', 'emissiveMap', 'emissiveMapEncoding', 'bumpMap', 'normalMap', 'displacementMap', 'specularMap',
  		'roughnessMap', 'metalnessMap', 'gradientMap',
  		'alphaMap', 'combine', 'vertexColors', 'fog', 'useFog', 'fogExp',
  		'flatShading', 'sizeAttenuation', 'logarithmicDepthBuffer', 'skinning',
  		'maxBones', 'useVertexTexture', 'morphTargets', 'morphNormals',
  		'maxMorphTargets', 'maxMorphNormals', 'premultipliedAlpha',
  		'numDirLights', 'numPointLights', 'numSpotLights', 'numHemiLights', 'numRectAreaLights',
  		'shadowMapEnabled', 'shadowMapType', 'toneMapping', 'physicallyCorrectLights',
  		'alphaTest', 'doubleSided', 'flipSided', 'numClippingPlanes', 'numClipIntersection', 'depthPacking', 'dithering'
  	]

  	function allocateBones (object) {
  		var skeleton = object.skeleton
  		var bones = skeleton.bones

  		if (capabilities.floatVertexTextures) {
  			return 1024
  		} else {
  			// default for when object is not specified
  			// ( for example when prebuilding shader to be used with multiple objects )
  			//
  			//  - leave some extra space for other uniforms
  			//  - limit here is ANGLE's 254 max uniform vectors
  			//    (up to 54 should be safe)

  			var nVertexUniforms = capabilities.maxVertexUniforms
  			var nVertexMatrices = Math.floor((nVertexUniforms - 20) / 4)

  			var maxBones = Math.min(nVertexMatrices, bones.length)

  			if (maxBones < bones.length) {
  				console.warn('THREE.WebGLRenderer: Skeleton has ' + bones.length + ' bones. This GPU supports ' + maxBones + '.')
  				return 0
  			}

  			return maxBones
  		}
  	}

  	function getTextureEncodingFromMap (map, gammaOverrideLinear) {
  		var encoding

  		if (!map) {
  			encoding = LinearEncoding
  		} else if (map.isTexture) {
  			encoding = map.encoding
  		} else if (map.isWebGLRenderTarget) {
  			console.warn("THREE.WebGLPrograms.getTextureEncodingFromMap: don't use render targets as textures. Use their .texture property instead.")
  			encoding = map.texture.encoding
  		}

  		// add backwards compatibility for WebGLRenderer.gammaInput/gammaOutput parameter, should probably be removed at some point.
  		if (encoding === LinearEncoding && gammaOverrideLinear) {
  			encoding = GammaEncoding
  		}

  		return encoding
  	}

  	this.getParameters = function (material, lights, shadows, fog, nClipPlanes, nClipIntersection, object) {
  		var shaderID = shaderIDs[material.type]

  		// heuristics to create shader parameters according to lights in the scene
  		// (not to blow over maxLights budget)

  		var maxBones = object.isSkinnedMesh ? allocateBones(object) : 0
  		var precision = capabilities.precision

  		if (material.precision !== null) {
  			precision = capabilities.getMaxPrecision(material.precision)

  			if (precision !== material.precision) {
  				console.warn('THREE.WebGLProgram.getParameters:', material.precision, 'not supported, using', precision, 'instead.')
  			}
  		}

  		var currentRenderTarget = renderer.getRenderTarget()

  		var parameters = {

  			shaderID: shaderID,

  			precision: precision,
  			supportsVertexTextures: capabilities.vertexTextures,
  			outputEncoding: getTextureEncodingFromMap((!currentRenderTarget) ? null : currentRenderTarget.texture, renderer.gammaOutput),
  			map: !!material.map,
  			mapEncoding: getTextureEncodingFromMap(material.map, renderer.gammaInput),
  			envMap: !!material.envMap,
  			envMapMode: material.envMap && material.envMap.mapping,
  			envMapEncoding: getTextureEncodingFromMap(material.envMap, renderer.gammaInput),
  			envMapCubeUV: (!!material.envMap) && ((material.envMap.mapping === CubeUVReflectionMapping) || (material.envMap.mapping === CubeUVRefractionMapping)),
  			lightMap: !!material.lightMap,
  			aoMap: !!material.aoMap,
  			emissiveMap: !!material.emissiveMap,
  			emissiveMapEncoding: getTextureEncodingFromMap(material.emissiveMap, renderer.gammaInput),
  			bumpMap: !!material.bumpMap,
  			normalMap: !!material.normalMap,
  			displacementMap: !!material.displacementMap,
  			roughnessMap: !!material.roughnessMap,
  			metalnessMap: !!material.metalnessMap,
  			specularMap: !!material.specularMap,
  			alphaMap: !!material.alphaMap,

  			gradientMap: !!material.gradientMap,

  			combine: material.combine,

  			vertexColors: material.vertexColors,

  			fog: !!fog,
  			useFog: material.fog,
  			fogExp: (fog && fog.isFogExp2),

  			flatShading: material.flatShading,

  			sizeAttenuation: material.sizeAttenuation,
  			logarithmicDepthBuffer: capabilities.logarithmicDepthBuffer,

  			skinning: material.skinning && maxBones > 0,
  			maxBones: maxBones,
  			useVertexTexture: capabilities.floatVertexTextures,

  			morphTargets: material.morphTargets,
  			morphNormals: material.morphNormals,
  			maxMorphTargets: renderer.maxMorphTargets,
  			maxMorphNormals: renderer.maxMorphNormals,

  			numDirLights: lights.directional.length,
  			numPointLights: lights.point.length,
  			numSpotLights: lights.spot.length,
  			numRectAreaLights: lights.rectArea.length,
  			numHemiLights: lights.hemi.length,

  			numClippingPlanes: nClipPlanes,
  			numClipIntersection: nClipIntersection,

  			dithering: material.dithering,

  			shadowMapEnabled: renderer.shadowMap.enabled && object.receiveShadow && shadows.length > 0,
  			shadowMapType: renderer.shadowMap.type,

  			toneMapping: renderer.toneMapping,
  			physicallyCorrectLights: renderer.physicallyCorrectLights,

  			premultipliedAlpha: material.premultipliedAlpha,

  			alphaTest: material.alphaTest,
  			doubleSided: material.side === DoubleSide,
  			flipSided: material.side === BackSide,

  			depthPacking: (material.depthPacking !== undefined) ? material.depthPacking : false

  		}

  		return parameters
  	}

  	this.getProgramCode = function (material, parameters) {
  		var array = []

  		if (parameters.shaderID) {
  			array.push(parameters.shaderID)
  		} else {
  			array.push(material.fragmentShader)
  			array.push(material.vertexShader)
  		}

  		if (material.defines !== undefined) {
  			for (var name in material.defines) {
  				array.push(name)
  				array.push(material.defines[name])
  			}
  		}

  		for (var i = 0; i < parameterNames.length; i++) {
  			array.push(parameters[parameterNames[i]])
  		}

  		array.push(material.onBeforeCompile.toString())

  		array.push(renderer.gammaOutput)

  		return array.join()
  	}

  	this.acquireProgram = function (material, shader, parameters, code) {
  		var program

  		// Check if code has been already compiled
  		for (var p = 0, pl = programs.length; p < pl; p++) {
  			var programInfo = programs[p]

  			if (programInfo.code === code) {
  				program = programInfo
  				++program.usedTimes

  				break
  			}
  		}

  		if (program === undefined) {
  			program = new WebGLProgram(renderer, extensions, code, material, shader, parameters)
  			programs.push(program)
  		}

  		return program
  	}

  	this.releaseProgram = function (program) {
  		if (--program.usedTimes === 0) {
  			// Remove from unordered set
  			var i = programs.indexOf(program)
  			programs[i] = programs[programs.length - 1]
  			programs.pop()

  			// Free WebGL resources
  			program.destroy()
  		}
  	}

  	// Exposed for resource monitoring & error feedback via renderer.info:
  	this.programs = programs
  }

  /**
   * @author fordacious / fordacious.github.io
   */

  function WebGLProperties () {
  	var properties = new WeakMap()

  	function get (object) {
  		var map = properties.get(object)

  		if (map === undefined) {
  			map = {}
  			properties.set(object, map)
  		}

  		return map
  	}

  	function remove (object) {
  		properties.delete(object)
  	}

  	function update (object, key, value) {
  		properties.get(object)[key] = value
  	}

  	function dispose () {
  		properties = new WeakMap()
  	}

  	return {
  		get: get,
  		remove: remove,
  		update: update,
  		dispose: dispose
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function painterSortStable (a, b) {
  	if (a.renderOrder !== b.renderOrder) {
  		return a.renderOrder - b.renderOrder
  	} else if (a.program && b.program && a.program !== b.program) {
  		return a.program.id - b.program.id
  	} else if (a.material.id !== b.material.id) {
  		return a.material.id - b.material.id
  	} else if (a.z !== b.z) {
  		return a.z - b.z
  	} else {
  		return a.id - b.id
  	}
  }

  function reversePainterSortStable (a, b) {
  	if (a.renderOrder !== b.renderOrder) {
  		return a.renderOrder - b.renderOrder
  	} if (a.z !== b.z) {
  		return b.z - a.z
  	} else {
  		return a.id - b.id
  	}
  }

  function WebGLRenderList () {
  	var renderItems = []
  	var renderItemsIndex = 0

  	var opaque = []
  	var transparent = []

  	function init () {
  		renderItemsIndex = 0

  		opaque.length = 0
  		transparent.length = 0
  	}

  	function push (object, geometry, material, z, group) {
  		var renderItem = renderItems[renderItemsIndex]

  		if (renderItem === undefined) {
  			renderItem = {
  				id: object.id,
  				object: object,
  				geometry: geometry,
  				material: material,
  				program: material.program,
  				renderOrder: object.renderOrder,
  				z: z,
  				group: group
  			}

  			renderItems[renderItemsIndex] = renderItem
  		} else {
  			renderItem.id = object.id
  			renderItem.object = object
  			renderItem.geometry = geometry
  			renderItem.material = material
  			renderItem.program = material.program
  			renderItem.renderOrder = object.renderOrder
  			renderItem.z = z
  			renderItem.group = group
  		}

  		(material.transparent === true ? transparent : opaque).push(renderItem)

  		renderItemsIndex++
  	}

  	function sort () {
  		if (opaque.length > 1) opaque.sort(painterSortStable)
  		if (transparent.length > 1) transparent.sort(reversePainterSortStable)
  	}

  	return {
  		opaque: opaque,
  		transparent: transparent,

  		init: init,
  		push: push,

  		sort: sort
  	}
  }

  function WebGLRenderLists () {
  	var lists = {}

  	function get (scene, camera) {
  		var hash = scene.id + ',' + camera.id
  		var list = lists[hash]

  		if (list === undefined) {
  			// console.log( 'THREE.WebGLRenderLists:', hash );

  			list = new WebGLRenderList()
  			lists[hash] = list
  		}

  		return list
  	}

  	function dispose () {
  		lists = {}
  	}

  	return {
  		get: get,
  		dispose: dispose
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function UniformsCache () {
  	var lights = {}

  	return {

  		get: function (light) {
  			if (lights[light.id] !== undefined) {
  				return lights[light.id]
  			}

  			var uniforms

  			switch (light.type) {
  				case 'DirectionalLight':
  					uniforms = {
  						direction: new Vector3(),
  						color: new Color(),

  						shadow: false,
  						shadowBias: 0,
  						shadowRadius: 1,
  						shadowMapSize: new Vector2()
  					}
  					break

  				case 'SpotLight':
  					uniforms = {
  						position: new Vector3(),
  						direction: new Vector3(),
  						color: new Color(),
  						distance: 0,
  						coneCos: 0,
  						penumbraCos: 0,
  						decay: 0,

  						shadow: false,
  						shadowBias: 0,
  						shadowRadius: 1,
  						shadowMapSize: new Vector2()
  					}
  					break

  				case 'PointLight':
  					uniforms = {
  						position: new Vector3(),
  						color: new Color(),
  						distance: 0,
  						decay: 0,

  						shadow: false,
  						shadowBias: 0,
  						shadowRadius: 1,
  						shadowMapSize: new Vector2(),
  						shadowCameraNear: 1,
  						shadowCameraFar: 1000
  					}
  					break

  				case 'HemisphereLight':
  					uniforms = {
  						direction: new Vector3(),
  						skyColor: new Color(),
  						groundColor: new Color()
  					}
  					break

  				case 'RectAreaLight':
  					uniforms = {
  						color: new Color(),
  						position: new Vector3(),
  						halfWidth: new Vector3(),
  						halfHeight: new Vector3()
  						// TODO (abelnation): set RectAreaLight shadow uniforms
  					}
  					break
  			}

  			lights[light.id] = uniforms

  			return uniforms
  		}

  	}
  }

  var count = 0

  function WebGLLights () {
  	var cache = new UniformsCache()

  	var state = {

  		id: count++,

  		hash: '',

  		ambient: [0, 0, 0],
  		directional: [],
  		directionalShadowMap: [],
  		directionalShadowMatrix: [],
  		spot: [],
  		spotShadowMap: [],
  		spotShadowMatrix: [],
  		rectArea: [],
  		point: [],
  		pointShadowMap: [],
  		pointShadowMatrix: [],
  		hemi: []

  	}

  	var vector3 = new Vector3()
  	var matrix4 = new Matrix4()
  	var matrix42 = new Matrix4()

  	function setup (lights, shadows, camera) {
  		var r = 0; var g = 0; var b = 0

  		var directionalLength = 0
  		var pointLength = 0
  		var spotLength = 0
  		var rectAreaLength = 0
  		var hemiLength = 0

  		var viewMatrix = camera.matrixWorldInverse

  		for (var i = 0, l = lights.length; i < l; i++) {
  			var light = lights[i]

  			var color = light.color
  			var intensity = light.intensity
  			var distance = light.distance

  			var shadowMap = (light.shadow && light.shadow.map) ? light.shadow.map.texture : null

  			if (light.isAmbientLight) {
  				r += color.r * intensity
  				g += color.g * intensity
  				b += color.b * intensity
  			} else if (light.isDirectionalLight) {
  				var uniforms = cache.get(light)

  				uniforms.color.copy(light.color).multiplyScalar(light.intensity)
  				uniforms.direction.setFromMatrixPosition(light.matrixWorld)
  				vector3.setFromMatrixPosition(light.target.matrixWorld)
  				uniforms.direction.sub(vector3)
  				uniforms.direction.transformDirection(viewMatrix)

  				uniforms.shadow = light.castShadow

  				if (light.castShadow) {
  					var shadow = light.shadow

  					uniforms.shadowBias = shadow.bias
  					uniforms.shadowRadius = shadow.radius
  					uniforms.shadowMapSize = shadow.mapSize
  				}

  				state.directionalShadowMap[directionalLength] = shadowMap
  				state.directionalShadowMatrix[directionalLength] = light.shadow.matrix
  				state.directional[directionalLength] = uniforms

  				directionalLength++
  			} else if (light.isSpotLight) {
  				var uniforms = cache.get(light)

  				uniforms.position.setFromMatrixPosition(light.matrixWorld)
  				uniforms.position.applyMatrix4(viewMatrix)

  				uniforms.color.copy(color).multiplyScalar(intensity)
  				uniforms.distance = distance

  				uniforms.direction.setFromMatrixPosition(light.matrixWorld)
  				vector3.setFromMatrixPosition(light.target.matrixWorld)
  				uniforms.direction.sub(vector3)
  				uniforms.direction.transformDirection(viewMatrix)

  				uniforms.coneCos = Math.cos(light.angle)
  				uniforms.penumbraCos = Math.cos(light.angle * (1 - light.penumbra))
  				uniforms.decay = (light.distance === 0) ? 0.0 : light.decay

  				uniforms.shadow = light.castShadow

  				if (light.castShadow) {
  					var shadow = light.shadow

  					uniforms.shadowBias = shadow.bias
  					uniforms.shadowRadius = shadow.radius
  					uniforms.shadowMapSize = shadow.mapSize
  				}

  				state.spotShadowMap[spotLength] = shadowMap
  				state.spotShadowMatrix[spotLength] = light.shadow.matrix
  				state.spot[spotLength] = uniforms

  				spotLength++
  			} else if (light.isRectAreaLight) {
  				var uniforms = cache.get(light)

  				// (a) intensity is the total visible light emitted
  				// uniforms.color.copy( color ).multiplyScalar( intensity / ( light.width * light.height * Math.PI ) );

  				// (b) intensity is the brightness of the light
  				uniforms.color.copy(color).multiplyScalar(intensity)

  				uniforms.position.setFromMatrixPosition(light.matrixWorld)
  				uniforms.position.applyMatrix4(viewMatrix)

  				// extract local rotation of light to derive width/height half vectors
  				matrix42.identity()
  				matrix4.copy(light.matrixWorld)
  				matrix4.premultiply(viewMatrix)
  				matrix42.extractRotation(matrix4)

  				uniforms.halfWidth.set(light.width * 0.5, 0.0, 0.0)
  				uniforms.halfHeight.set(0.0, light.height * 0.5, 0.0)

  				uniforms.halfWidth.applyMatrix4(matrix42)
  				uniforms.halfHeight.applyMatrix4(matrix42)

  				// TODO (abelnation): RectAreaLight distance?
  				// uniforms.distance = distance;

  				state.rectArea[rectAreaLength] = uniforms

  				rectAreaLength++
  			} else if (light.isPointLight) {
  				var uniforms = cache.get(light)

  				uniforms.position.setFromMatrixPosition(light.matrixWorld)
  				uniforms.position.applyMatrix4(viewMatrix)

  				uniforms.color.copy(light.color).multiplyScalar(light.intensity)
  				uniforms.distance = light.distance
  				uniforms.decay = (light.distance === 0) ? 0.0 : light.decay

  				uniforms.shadow = light.castShadow

  				if (light.castShadow) {
  					var shadow = light.shadow

  					uniforms.shadowBias = shadow.bias
  					uniforms.shadowRadius = shadow.radius
  					uniforms.shadowMapSize = shadow.mapSize
  					uniforms.shadowCameraNear = shadow.camera.near
  					uniforms.shadowCameraFar = shadow.camera.far
  				}

  				state.pointShadowMap[pointLength] = shadowMap
  				state.pointShadowMatrix[pointLength] = light.shadow.matrix
  				state.point[pointLength] = uniforms

  				pointLength++
  			} else if (light.isHemisphereLight) {
  				var uniforms = cache.get(light)

  				uniforms.direction.setFromMatrixPosition(light.matrixWorld)
  				uniforms.direction.transformDirection(viewMatrix)
  				uniforms.direction.normalize()

  				uniforms.skyColor.copy(light.color).multiplyScalar(intensity)
  				uniforms.groundColor.copy(light.groundColor).multiplyScalar(intensity)

  				state.hemi[hemiLength] = uniforms

  				hemiLength++
  			}
  		}

  		state.ambient[0] = r
  		state.ambient[1] = g
  		state.ambient[2] = b

  		state.directional.length = directionalLength
  		state.spot.length = spotLength
  		state.rectArea.length = rectAreaLength
  		state.point.length = pointLength
  		state.hemi.length = hemiLength

  		state.hash = state.id + ',' + directionalLength + ',' + pointLength + ',' + spotLength + ',' + rectAreaLength + ',' + hemiLength + ',' + shadows.length
  	}

  	return {
  		setup: setup,
  		state: state
  	}
  }

  /**
   * @author Mugen87 / https://github.com/Mugen87
   */

  function WebGLRenderState () {
  	var lights = new WebGLLights()

  	var lightsArray = []
  	var shadowsArray = []
  	var spritesArray = []

  	function init () {
  		lightsArray.length = 0
  		shadowsArray.length = 0
  		spritesArray.length = 0
  	}

  	function pushLight (light) {
  		lightsArray.push(light)
  	}

  	function pushShadow (shadowLight) {
  		shadowsArray.push(shadowLight)
  	}

  	function pushSprite (shadowLight) {
  		spritesArray.push(shadowLight)
  	}

  	function setupLights (camera) {
  		lights.setup(lightsArray, shadowsArray, camera)
  	}

  	var state = {
  		lightsArray: lightsArray,
  		shadowsArray: shadowsArray,
  		spritesArray: spritesArray,

  		lights: lights
  	}

  	return {
  		init: init,
  		state: state,
  		setupLights: setupLights,

  		pushLight: pushLight,
  		pushShadow: pushShadow,
  		pushSprite: pushSprite
  	}
  }

  function WebGLRenderStates () {
  	var renderStates = {}

  	function get (scene, camera) {
  		var hash = scene.id + ',' + camera.id

  		var renderState = renderStates[hash]

  		if (renderState === undefined) {
  			renderState = new WebGLRenderState()
  			renderStates[hash] = renderState
  		}

  		return renderState
  	}

  	function dispose () {
  		renderStates = {}
  	}

  	return {
  		get: get,
  		dispose: dispose
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   * @author bhouston / https://clara.io
   * @author WestLangley / http://github.com/WestLangley
   *
   * parameters = {
   *
   *  opacity: <float>,
   *
   *  map: new THREE.Texture( <Image> ),
   *
   *  alphaMap: new THREE.Texture( <Image> ),
   *
   *  displacementMap: new THREE.Texture( <Image> ),
   *  displacementScale: <float>,
   *  displacementBias: <float>,
   *
   *  wireframe: <boolean>,
   *  wireframeLinewidth: <float>
   * }
   */

  function MeshDepthMaterial (parameters) {
  	Material.call(this)

  	this.type = 'MeshDepthMaterial'

  	this.depthPacking = BasicDepthPacking

  	this.skinning = false
  	this.morphTargets = false

  	this.map = null

  	this.alphaMap = null

  	this.displacementMap = null
  	this.displacementScale = 1
  	this.displacementBias = 0

  	this.wireframe = false
  	this.wireframeLinewidth = 1

  	this.fog = false
  	this.lights = false

  	this.setValues(parameters)
  }

  MeshDepthMaterial.prototype = Object.create(Material.prototype)
  MeshDepthMaterial.prototype.constructor = MeshDepthMaterial

  MeshDepthMaterial.prototype.isMeshDepthMaterial = true

  MeshDepthMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.depthPacking = source.depthPacking

  	this.skinning = source.skinning
  	this.morphTargets = source.morphTargets

  	this.map = source.map

  	this.alphaMap = source.alphaMap

  	this.displacementMap = source.displacementMap
  	this.displacementScale = source.displacementScale
  	this.displacementBias = source.displacementBias

  	this.wireframe = source.wireframe
  	this.wireframeLinewidth = source.wireframeLinewidth

  	return this
  }

  /**
   * @author WestLangley / http://github.com/WestLangley
   *
   * parameters = {
   *
   *  referencePosition: <float>,
   *  nearDistance: <float>,
   *  farDistance: <float>,
   *
   *  skinning: <bool>,
   *  morphTargets: <bool>,
   *
   *  map: new THREE.Texture( <Image> ),
   *
   *  alphaMap: new THREE.Texture( <Image> ),
   *
   *  displacementMap: new THREE.Texture( <Image> ),
   *  displacementScale: <float>,
   *  displacementBias: <float>
   *
   * }
   */

  function MeshDistanceMaterial (parameters) {
  	Material.call(this)

  	this.type = 'MeshDistanceMaterial'

  	this.referencePosition = new Vector3()
  	this.nearDistance = 1
  	this.farDistance = 1000

  	this.skinning = false
  	this.morphTargets = false

  	this.map = null

  	this.alphaMap = null

  	this.displacementMap = null
  	this.displacementScale = 1
  	this.displacementBias = 0

  	this.fog = false
  	this.lights = false

  	this.setValues(parameters)
  }

  MeshDistanceMaterial.prototype = Object.create(Material.prototype)
  MeshDistanceMaterial.prototype.constructor = MeshDistanceMaterial

  MeshDistanceMaterial.prototype.isMeshDistanceMaterial = true

  MeshDistanceMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.referencePosition.copy(source.referencePosition)
  	this.nearDistance = source.nearDistance
  	this.farDistance = source.farDistance

  	this.skinning = source.skinning
  	this.morphTargets = source.morphTargets

  	this.map = source.map

  	this.alphaMap = source.alphaMap

  	this.displacementMap = source.displacementMap
  	this.displacementScale = source.displacementScale
  	this.displacementBias = source.displacementBias

  	return this
  }

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLShadowMap (_renderer, _objects, maxTextureSize) {
  	var _frustum = new Frustum()
  		var _projScreenMatrix = new Matrix4()

  		var _shadowMapSize = new Vector2()
  		var _maxShadowMapSize = new Vector2(maxTextureSize, maxTextureSize)

  		var _lookTarget = new Vector3()
  		var _lightPositionWorld = new Vector3()

  		var _MorphingFlag = 1
  		var _SkinningFlag = 2

  		var _NumberOfMaterialVariants = (_MorphingFlag | _SkinningFlag) + 1

  		var _depthMaterials = new Array(_NumberOfMaterialVariants)
  		var _distanceMaterials = new Array(_NumberOfMaterialVariants)

  		var _materialCache = {}

  	var shadowSide = { 0: BackSide, 1: FrontSide, 2: DoubleSide }

  	var cubeDirections = [
  		new Vector3(1, 0, 0), new Vector3(-1, 0, 0), new Vector3(0, 0, 1),
  		new Vector3(0, 0, -1), new Vector3(0, 1, 0), new Vector3(0, -1, 0)
  	]

  	var cubeUps = [
  		new Vector3(0, 1, 0), new Vector3(0, 1, 0), new Vector3(0, 1, 0),
  		new Vector3(0, 1, 0), new Vector3(0, 0, 1),	new Vector3(0, 0, -1)
  	]

  	var cube2DViewPorts = [
  		new Vector4(), new Vector4(), new Vector4(),
  		new Vector4(), new Vector4(), new Vector4()
  	]

  	// init

  	for (var i = 0; i !== _NumberOfMaterialVariants; ++i) {
  		var useMorphing = (i & _MorphingFlag) !== 0
  		var useSkinning = (i & _SkinningFlag) !== 0

  		var depthMaterial = new MeshDepthMaterial({

  			depthPacking: RGBADepthPacking,

  			morphTargets: useMorphing,
  			skinning: useSkinning

  		})

  		_depthMaterials[i] = depthMaterial

  		//

  		var distanceMaterial = new MeshDistanceMaterial({

  			morphTargets: useMorphing,
  			skinning: useSkinning

  		})

  		_distanceMaterials[i] = distanceMaterial
  	}

  	//

  	var scope = this

  	this.enabled = false

  	this.autoUpdate = true
  	this.needsUpdate = false

  	this.type = PCFShadowMap

  	this.render = function (lights, scene, camera) {
  		if (scope.enabled === false) return
  		if (scope.autoUpdate === false && scope.needsUpdate === false) return

  		if (lights.length === 0) return

  		// TODO Clean up (needed in case of contextlost)
  		var _gl = _renderer.context
  		var _state = _renderer.state

  		// Set GL state for depth map.
  		_state.disable(_gl.BLEND)
  		_state.buffers.color.setClear(1, 1, 1, 1)
  		_state.buffers.depth.setTest(true)
  		_state.setScissorTest(false)

  		// render depth map

  		var faceCount

  		for (var i = 0, il = lights.length; i < il; i++) {
  			var light = lights[i]
  			var shadow = light.shadow
  			var isPointLight = light && light.isPointLight

  			if (shadow === undefined) {
  				console.warn('THREE.WebGLShadowMap:', light, 'has no shadow.')
  				continue
  			}

  			var shadowCamera = shadow.camera

  			_shadowMapSize.copy(shadow.mapSize)
  			_shadowMapSize.min(_maxShadowMapSize)

  			if (isPointLight) {
  				var vpWidth = _shadowMapSize.x
  				var vpHeight = _shadowMapSize.y

  				// These viewports map a cube-map onto a 2D texture with the
  				// following orientation:
  				//
  				//  xzXZ
  				//   y Y
  				//
  				// X - Positive x direction
  				// x - Negative x direction
  				// Y - Positive y direction
  				// y - Negative y direction
  				// Z - Positive z direction
  				// z - Negative z direction

  				// positive X
  				cube2DViewPorts[0].set(vpWidth * 2, vpHeight, vpWidth, vpHeight)
  				// negative X
  				cube2DViewPorts[1].set(0, vpHeight, vpWidth, vpHeight)
  				// positive Z
  				cube2DViewPorts[2].set(vpWidth * 3, vpHeight, vpWidth, vpHeight)
  				// negative Z
  				cube2DViewPorts[3].set(vpWidth, vpHeight, vpWidth, vpHeight)
  				// positive Y
  				cube2DViewPorts[4].set(vpWidth * 3, 0, vpWidth, vpHeight)
  				// negative Y
  				cube2DViewPorts[5].set(vpWidth, 0, vpWidth, vpHeight)

  				_shadowMapSize.x *= 4.0
  				_shadowMapSize.y *= 2.0
  			}

  			if (shadow.map === null) {
  				var pars = { minFilter: NearestFilter, magFilter: NearestFilter, format: RGBAFormat }

  				shadow.map = new WebGLRenderTarget(_shadowMapSize.x, _shadowMapSize.y, pars)
  				shadow.map.texture.name = light.name + '.shadowMap'

  				shadowCamera.updateProjectionMatrix()
  			}

  			if (shadow.isSpotLightShadow) {
  				shadow.update(light)
  			}

  			var shadowMap = shadow.map
  			var shadowMatrix = shadow.matrix

  			_lightPositionWorld.setFromMatrixPosition(light.matrixWorld)
  			shadowCamera.position.copy(_lightPositionWorld)

  			if (isPointLight) {
  				faceCount = 6

  				// for point lights we set the shadow matrix to be a translation-only matrix
  				// equal to inverse of the light's position

  				shadowMatrix.makeTranslation(-_lightPositionWorld.x, -_lightPositionWorld.y, -_lightPositionWorld.z)
  			} else {
  				faceCount = 1

  				_lookTarget.setFromMatrixPosition(light.target.matrixWorld)
  				shadowCamera.lookAt(_lookTarget)
  				shadowCamera.updateMatrixWorld()

  				// compute shadow matrix

  				shadowMatrix.set(
  					0.5, 0.0, 0.0, 0.5,
  					0.0, 0.5, 0.0, 0.5,
  					0.0, 0.0, 0.5, 0.5,
  					0.0, 0.0, 0.0, 1.0
  				)

  				shadowMatrix.multiply(shadowCamera.projectionMatrix)
  				shadowMatrix.multiply(shadowCamera.matrixWorldInverse)
  			}

  			_renderer.setRenderTarget(shadowMap)
  			_renderer.clear()

  			// render shadow map for each cube face (if omni-directional) or
  			// run a single pass if not

  			for (var face = 0; face < faceCount; face++) {
  				if (isPointLight) {
  					_lookTarget.copy(shadowCamera.position)
  					_lookTarget.add(cubeDirections[face])
  					shadowCamera.up.copy(cubeUps[face])
  					shadowCamera.lookAt(_lookTarget)
  					shadowCamera.updateMatrixWorld()

  					var vpDimensions = cube2DViewPorts[face]
  					_state.viewport(vpDimensions)
  				}

  				// update camera matrices and frustum

  				_projScreenMatrix.multiplyMatrices(shadowCamera.projectionMatrix, shadowCamera.matrixWorldInverse)
  				_frustum.setFromMatrix(_projScreenMatrix)

  				// set object matrices & frustum culling

  				renderObject(scene, camera, shadowCamera, isPointLight)
  			}
  		}

  		scope.needsUpdate = false
  	}

  	function getDepthMaterial (object, material, isPointLight, lightPositionWorld, shadowCameraNear, shadowCameraFar) {
  		var geometry = object.geometry

  		var result = null

  		var materialVariants = _depthMaterials
  		var customMaterial = object.customDepthMaterial

  		if (isPointLight) {
  			materialVariants = _distanceMaterials
  			customMaterial = object.customDistanceMaterial
  		}

  		if (!customMaterial) {
  			var useMorphing = false

  			if (material.morphTargets) {
  				if (geometry && geometry.isBufferGeometry) {
  					useMorphing = geometry.morphAttributes && geometry.morphAttributes.position && geometry.morphAttributes.position.length > 0
  				} else if (geometry && geometry.isGeometry) {
  					useMorphing = geometry.morphTargets && geometry.morphTargets.length > 0
  				}
  			}

  			if (object.isSkinnedMesh && material.skinning === false) {
  				console.warn('THREE.WebGLShadowMap: THREE.SkinnedMesh with material.skinning set to false:', object)
  			}

  			var useSkinning = object.isSkinnedMesh && material.skinning

  			var variantIndex = 0

  			if (useMorphing) variantIndex |= _MorphingFlag
  			if (useSkinning) variantIndex |= _SkinningFlag

  			result = materialVariants[variantIndex]
  		} else {
  			result = customMaterial
  		}

  		if (_renderer.localClippingEnabled &&
  				material.clipShadows === true &&
  				material.clippingPlanes.length !== 0) {
  			// in this case we need a unique material instance reflecting the
  			// appropriate state

  			var keyA = result.uuid; var keyB = material.uuid

  			var materialsForVariant = _materialCache[keyA]

  			if (materialsForVariant === undefined) {
  				materialsForVariant = {}
  				_materialCache[keyA] = materialsForVariant
  			}

  			var cachedMaterial = materialsForVariant[keyB]

  			if (cachedMaterial === undefined) {
  				cachedMaterial = result.clone()
  				materialsForVariant[keyB] = cachedMaterial
  			}

  			result = cachedMaterial
  		}

  		result.visible = material.visible
  		result.wireframe = material.wireframe

  		result.side = (material.shadowSide != null) ? material.shadowSide : shadowSide[material.side]

  		result.clipShadows = material.clipShadows
  		result.clippingPlanes = material.clippingPlanes
  		result.clipIntersection = material.clipIntersection

  		result.wireframeLinewidth = material.wireframeLinewidth
  		result.linewidth = material.linewidth

  		if (isPointLight && result.isMeshDistanceMaterial) {
  			result.referencePosition.copy(lightPositionWorld)
  			result.nearDistance = shadowCameraNear
  			result.farDistance = shadowCameraFar
  		}

  		return result
  	}

  	function renderObject (object, camera, shadowCamera, isPointLight) {
  		if (object.visible === false) return

  		var visible = object.layers.test(camera.layers)

  		if (visible && (object.isMesh || object.isLine || object.isPoints)) {
  			if (object.castShadow && (!object.frustumCulled || _frustum.intersectsObject(object))) {
  				object.modelViewMatrix.multiplyMatrices(shadowCamera.matrixWorldInverse, object.matrixWorld)

  				var geometry = _objects.update(object)
  				var material = object.material

  				if (Array.isArray(material)) {
  					var groups = geometry.groups

  					for (var k = 0, kl = groups.length; k < kl; k++) {
  						var group = groups[k]
  						var groupMaterial = material[group.materialIndex]

  						if (groupMaterial && groupMaterial.visible) {
  							var depthMaterial = getDepthMaterial(object, groupMaterial, isPointLight, _lightPositionWorld, shadowCamera.near, shadowCamera.far)
  							_renderer.renderBufferDirect(shadowCamera, null, geometry, depthMaterial, object, group)
  						}
  					}
  				} else if (material.visible) {
  					var depthMaterial = getDepthMaterial(object, material, isPointLight, _lightPositionWorld, shadowCamera.near, shadowCamera.far)
  					_renderer.renderBufferDirect(shadowCamera, null, geometry, depthMaterial, object, null)
  				}
  			}
  		}

  		var children = object.children

  		for (var i = 0, l = children.length; i < l; i++) {
  			renderObject(children[i], camera, shadowCamera, isPointLight)
  		}
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function CanvasTexture (canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy) {
  	Texture.call(this, canvas, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy)

  	this.needsUpdate = true
  }

  CanvasTexture.prototype = Object.create(Texture.prototype)
  CanvasTexture.prototype.constructor = CanvasTexture
  CanvasTexture.prototype.isCanvasTexture = true

  /**
   * @author mikael emtinger / http://gomo.se/
   * @author alteredq / http://alteredqualia.com/
   */

  function WebGLSpriteRenderer (renderer, gl, state, textures, capabilities) {
  	var vertexBuffer, elementBuffer
  	var program, attributes, uniforms

  	var texture

  	// decompose matrixWorld

  	var spritePosition = new Vector3()
  	var spriteRotation = new Quaternion()
  	var spriteScale = new Vector3()

  	function init () {
  		var vertices = new Float32Array([
  			-0.5, -0.5, 0, 0,
  			  0.5, -0.5, 1, 0,
  			  0.5, 0.5, 1, 1,
  			-0.5, 0.5, 0, 1
  		])

  		var faces = new Uint16Array([
  			0, 1, 2,
  			0, 2, 3
  		])

  		vertexBuffer = gl.createBuffer()
  		elementBuffer = gl.createBuffer()

  		gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer)
  		gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW)

  		gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elementBuffer)
  		gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, faces, gl.STATIC_DRAW)

  		program = createProgram()

  		attributes = {
  			position: gl.getAttribLocation(program, 'position'),
  			uv: gl.getAttribLocation(program, 'uv')
  		}

  		uniforms = {
  			uvOffset: gl.getUniformLocation(program, 'uvOffset'),
  			uvScale: gl.getUniformLocation(program, 'uvScale'),

  			rotation: gl.getUniformLocation(program, 'rotation'),
  			center: gl.getUniformLocation(program, 'center'),
  			scale: gl.getUniformLocation(program, 'scale'),

  			color: gl.getUniformLocation(program, 'color'),
  			map: gl.getUniformLocation(program, 'map'),
  			opacity: gl.getUniformLocation(program, 'opacity'),

  			modelViewMatrix: gl.getUniformLocation(program, 'modelViewMatrix'),
  			projectionMatrix: gl.getUniformLocation(program, 'projectionMatrix'),

  			fogType: gl.getUniformLocation(program, 'fogType'),
  			fogDensity: gl.getUniformLocation(program, 'fogDensity'),
  			fogNear: gl.getUniformLocation(program, 'fogNear'),
  			fogFar: gl.getUniformLocation(program, 'fogFar'),
  			fogColor: gl.getUniformLocation(program, 'fogColor'),
  			fogDepth: gl.getUniformLocation(program, 'fogDepth'),

  			alphaTest: gl.getUniformLocation(program, 'alphaTest')
  		}

  		var canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas')
  		canvas.width = 8
  		canvas.height = 8

  		var context = canvas.getContext('2d')
  		context.fillStyle = 'white'
  		context.fillRect(0, 0, 8, 8)

  		texture = new CanvasTexture(canvas)
  	}

  	this.render = function (sprites, scene, camera) {
  		if (sprites.length === 0) return

  		// setup gl

  		if (program === undefined) {
  			init()
  		}

  		state.useProgram(program)

  		state.initAttributes()
  		state.enableAttribute(attributes.position)
  		state.enableAttribute(attributes.uv)
  		state.disableUnusedAttributes()

  		state.disable(gl.CULL_FACE)
  		state.enable(gl.BLEND)

  		gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer)
  		gl.vertexAttribPointer(attributes.position, 2, gl.FLOAT, false, 2 * 8, 0)
  		gl.vertexAttribPointer(attributes.uv, 2, gl.FLOAT, false, 2 * 8, 8)

  		gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elementBuffer)

  		gl.uniformMatrix4fv(uniforms.projectionMatrix, false, camera.projectionMatrix.elements)

  		state.activeTexture(gl.TEXTURE0)
  		gl.uniform1i(uniforms.map, 0)

  		var oldFogType = 0
  		var sceneFogType = 0
  		var fog = scene.fog

  		if (fog) {
  			gl.uniform3f(uniforms.fogColor, fog.color.r, fog.color.g, fog.color.b)

  			if (fog.isFog) {
  				gl.uniform1f(uniforms.fogNear, fog.near)
  				gl.uniform1f(uniforms.fogFar, fog.far)

  				gl.uniform1i(uniforms.fogType, 1)
  				oldFogType = 1
  				sceneFogType = 1
  			} else if (fog.isFogExp2) {
  				gl.uniform1f(uniforms.fogDensity, fog.density)

  				gl.uniform1i(uniforms.fogType, 2)
  				oldFogType = 2
  				sceneFogType = 2
  			}
  		} else {
  			gl.uniform1i(uniforms.fogType, 0)
  			oldFogType = 0
  			sceneFogType = 0
  		}

  		// update positions and sort

  		for (var i = 0, l = sprites.length; i < l; i++) {
  			var sprite = sprites[i]

  			sprite.modelViewMatrix.multiplyMatrices(camera.matrixWorldInverse, sprite.matrixWorld)
  			sprite.z = -sprite.modelViewMatrix.elements[14]
  		}

  		sprites.sort(painterSortStable)

  		// render all sprites

  		var scale = []
  		var center = []

  		for (var i = 0, l = sprites.length; i < l; i++) {
  			var sprite = sprites[i]
  			var material = sprite.material

  			if (material.visible === false) continue

  			sprite.onBeforeRender(renderer, scene, camera, undefined, material, undefined)

  			gl.uniform1f(uniforms.alphaTest, material.alphaTest)
  			gl.uniformMatrix4fv(uniforms.modelViewMatrix, false, sprite.modelViewMatrix.elements)

  			sprite.matrixWorld.decompose(spritePosition, spriteRotation, spriteScale)

  			scale[0] = spriteScale.x
  			scale[1] = spriteScale.y

  			center[0] = sprite.center.x - 0.5
  			center[1] = sprite.center.y - 0.5

  			var fogType = 0

  			if (scene.fog && material.fog) {
  				fogType = sceneFogType
  			}

  			if (oldFogType !== fogType) {
  				gl.uniform1i(uniforms.fogType, fogType)
  				oldFogType = fogType
  			}

  			if (material.map !== null) {
  				gl.uniform2f(uniforms.uvOffset, material.map.offset.x, material.map.offset.y)
  				gl.uniform2f(uniforms.uvScale, material.map.repeat.x, material.map.repeat.y)
  			} else {
  				gl.uniform2f(uniforms.uvOffset, 0, 0)
  				gl.uniform2f(uniforms.uvScale, 1, 1)
  			}

  			gl.uniform1f(uniforms.opacity, material.opacity)
  			gl.uniform3f(uniforms.color, material.color.r, material.color.g, material.color.b)

  			gl.uniform1f(uniforms.rotation, material.rotation)
  			gl.uniform2fv(uniforms.center, center)
  			gl.uniform2fv(uniforms.scale, scale)

  			state.setBlending(material.blending, material.blendEquation, material.blendSrc, material.blendDst, material.blendEquationAlpha, material.blendSrcAlpha, material.blendDstAlpha, material.premultipliedAlpha)
  			state.buffers.depth.setTest(material.depthTest)
  			state.buffers.depth.setMask(material.depthWrite)
  			state.buffers.color.setMask(material.colorWrite)

  			textures.setTexture2D(material.map || texture, 0)

  			gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0)

  			sprite.onAfterRender(renderer, scene, camera, undefined, material, undefined)
  		}

  		// restore gl

  		state.enable(gl.CULL_FACE)

  		state.reset()
  	}

  	function createProgram () {
  		var program = gl.createProgram()

  		var vertexShader = gl.createShader(gl.VERTEX_SHADER)
  		var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER)

  		gl.shaderSource(vertexShader, [

  			'precision ' + capabilities.precision + ' float;',

  			'#define SHADER_NAME ' + 'SpriteMaterial',

  			'uniform mat4 modelViewMatrix;',
  			'uniform mat4 projectionMatrix;',
  			'uniform float rotation;',
  			'uniform vec2 center;',
  			'uniform vec2 scale;',
  			'uniform vec2 uvOffset;',
  			'uniform vec2 uvScale;',

  			'attribute vec2 position;',
  			'attribute vec2 uv;',

  			'varying vec2 vUV;',
  			'varying float fogDepth;',

  			'void main() {',

  			'	vUV = uvOffset + uv * uvScale;',

  			'	vec2 alignedPosition = ( position - center ) * scale;',

  			'	vec2 rotatedPosition;',
  			'	rotatedPosition.x = cos( rotation ) * alignedPosition.x - sin( rotation ) * alignedPosition.y;',
  			'	rotatedPosition.y = sin( rotation ) * alignedPosition.x + cos( rotation ) * alignedPosition.y;',

  			'	vec4 mvPosition;',

  			'	mvPosition = modelViewMatrix * vec4( 0.0, 0.0, 0.0, 1.0 );',
  			'	mvPosition.xy += rotatedPosition;',

  			'	gl_Position = projectionMatrix * mvPosition;',

  			'	fogDepth = - mvPosition.z;',

  			'}'

  		].join('\n'))

  		gl.shaderSource(fragmentShader, [

  			'precision ' + capabilities.precision + ' float;',

  			'#define SHADER_NAME ' + 'SpriteMaterial',

  			'uniform vec3 color;',
  			'uniform sampler2D map;',
  			'uniform float opacity;',

  			'uniform int fogType;',
  			'uniform vec3 fogColor;',
  			'uniform float fogDensity;',
  			'uniform float fogNear;',
  			'uniform float fogFar;',
  			'uniform float alphaTest;',

  			'varying vec2 vUV;',
  			'varying float fogDepth;',

  			'void main() {',

  			'	vec4 texture = texture2D( map, vUV );',

  			'	gl_FragColor = vec4( color * texture.xyz, texture.a * opacity );',

  			'	if ( gl_FragColor.a < alphaTest ) discard;',

  			'	if ( fogType > 0 ) {',

  			'		float fogFactor = 0.0;',

  			'		if ( fogType == 1 ) {',

  			'			fogFactor = smoothstep( fogNear, fogFar, fogDepth );',

  			'		} else {',

  			'			const float LOG2 = 1.442695;',
  			'			fogFactor = exp2( - fogDensity * fogDensity * fogDepth * fogDepth * LOG2 );',
  			'			fogFactor = 1.0 - clamp( fogFactor, 0.0, 1.0 );',

  			'		}',

  			'		gl_FragColor.rgb = mix( gl_FragColor.rgb, fogColor, fogFactor );',

  			'	}',

  			'}'

  		].join('\n'))

  		gl.compileShader(vertexShader)
  		gl.compileShader(fragmentShader)

  		gl.attachShader(program, vertexShader)
  		gl.attachShader(program, fragmentShader)

  		gl.linkProgram(program)

  		return program
  	}

  	function painterSortStable (a, b) {
  		if (a.renderOrder !== b.renderOrder) {
  			return a.renderOrder - b.renderOrder
  		} else if (a.z !== b.z) {
  			return b.z - a.z
  		} else {
  			return b.id - a.id
  		}
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLState (gl, extensions, utils) {
  	function ColorBuffer () {
  		var locked = false

  		var color = new Vector4()
  		var currentColorMask = null
  		var currentColorClear = new Vector4(0, 0, 0, 0)

  		return {

  			setMask: function (colorMask) {
  				if (currentColorMask !== colorMask && !locked) {
  					gl.colorMask(colorMask, colorMask, colorMask, colorMask)
  					currentColorMask = colorMask
  				}
  			},

  			setLocked: function (lock) {
  				locked = lock
  			},

  			setClear: function (r, g, b, a, premultipliedAlpha) {
  				if (premultipliedAlpha === true) {
  					r *= a; g *= a; b *= a
  				}

  				color.set(r, g, b, a)

  				if (currentColorClear.equals(color) === false) {
  					gl.clearColor(r, g, b, a)
  					currentColorClear.copy(color)
  				}
  			},

  			reset: function () {
  				locked = false

  				currentColorMask = null
  				currentColorClear.set(-1, 0, 0, 0) // set to invalid state
  			}

  		}
  	}

  	function DepthBuffer () {
  		var locked = false

  		var currentDepthMask = null
  		var currentDepthFunc = null
  		var currentDepthClear = null

  		return {

  			setTest: function (depthTest) {
  				if (depthTest) {
  					enable(gl.DEPTH_TEST)
  				} else {
  					disable(gl.DEPTH_TEST)
  				}
  			},

  			setMask: function (depthMask) {
  				if (currentDepthMask !== depthMask && !locked) {
  					gl.depthMask(depthMask)
  					currentDepthMask = depthMask
  				}
  			},

  			setFunc: function (depthFunc) {
  				if (currentDepthFunc !== depthFunc) {
  					if (depthFunc) {
  						switch (depthFunc) {
  							case NeverDepth:

  								gl.depthFunc(gl.NEVER)
  								break

  							case AlwaysDepth:

  								gl.depthFunc(gl.ALWAYS)
  								break

  							case LessDepth:

  								gl.depthFunc(gl.LESS)
  								break

  							case LessEqualDepth:

  								gl.depthFunc(gl.LEQUAL)
  								break

  							case EqualDepth:

  								gl.depthFunc(gl.EQUAL)
  								break

  							case GreaterEqualDepth:

  								gl.depthFunc(gl.GEQUAL)
  								break

  							case GreaterDepth:

  								gl.depthFunc(gl.GREATER)
  								break

  							case NotEqualDepth:

  								gl.depthFunc(gl.NOTEQUAL)
  								break

  							default:

  								gl.depthFunc(gl.LEQUAL)
  						}
  					} else {
  						gl.depthFunc(gl.LEQUAL)
  					}

  					currentDepthFunc = depthFunc
  				}
  			},

  			setLocked: function (lock) {
  				locked = lock
  			},

  			setClear: function (depth) {
  				if (currentDepthClear !== depth) {
  					gl.clearDepth(depth)
  					currentDepthClear = depth
  				}
  			},

  			reset: function () {
  				locked = false

  				currentDepthMask = null
  				currentDepthFunc = null
  				currentDepthClear = null
  			}

  		}
  	}

  	function StencilBuffer () {
  		var locked = false

  		var currentStencilMask = null
  		var currentStencilFunc = null
  		var currentStencilRef = null
  		var currentStencilFuncMask = null
  		var currentStencilFail = null
  		var currentStencilZFail = null
  		var currentStencilZPass = null
  		var currentStencilClear = null

  		return {

  			setTest: function (stencilTest) {
  				if (stencilTest) {
  					enable(gl.STENCIL_TEST)
  				} else {
  					disable(gl.STENCIL_TEST)
  				}
  			},

  			setMask: function (stencilMask) {
  				if (currentStencilMask !== stencilMask && !locked) {
  					gl.stencilMask(stencilMask)
  					currentStencilMask = stencilMask
  				}
  			},

  			setFunc: function (stencilFunc, stencilRef, stencilMask) {
  				if (currentStencilFunc !== stencilFunc ||
  				     currentStencilRef 	!== stencilRef 	||
  				     currentStencilFuncMask !== stencilMask) {
  					gl.stencilFunc(stencilFunc, stencilRef, stencilMask)

  					currentStencilFunc = stencilFunc
  					currentStencilRef = stencilRef
  					currentStencilFuncMask = stencilMask
  				}
  			},

  			setOp: function (stencilFail, stencilZFail, stencilZPass) {
  				if (currentStencilFail	 !== stencilFail 	||
  				     currentStencilZFail !== stencilZFail ||
  				     currentStencilZPass !== stencilZPass) {
  					gl.stencilOp(stencilFail, stencilZFail, stencilZPass)

  					currentStencilFail = stencilFail
  					currentStencilZFail = stencilZFail
  					currentStencilZPass = stencilZPass
  				}
  			},

  			setLocked: function (lock) {
  				locked = lock
  			},

  			setClear: function (stencil) {
  				if (currentStencilClear !== stencil) {
  					gl.clearStencil(stencil)
  					currentStencilClear = stencil
  				}
  			},

  			reset: function () {
  				locked = false

  				currentStencilMask = null
  				currentStencilFunc = null
  				currentStencilRef = null
  				currentStencilFuncMask = null
  				currentStencilFail = null
  				currentStencilZFail = null
  				currentStencilZPass = null
  				currentStencilClear = null
  			}

  		}
  	}

  	//

  	var colorBuffer = new ColorBuffer()
  	var depthBuffer = new DepthBuffer()
  	var stencilBuffer = new StencilBuffer()

  	var maxVertexAttributes = gl.getParameter(gl.MAX_VERTEX_ATTRIBS)
  	var newAttributes = new Uint8Array(maxVertexAttributes)
  	var enabledAttributes = new Uint8Array(maxVertexAttributes)
  	var attributeDivisors = new Uint8Array(maxVertexAttributes)

  	var capabilities = {}

  	var compressedTextureFormats = null

  	var currentProgram = null

  	var currentBlending = null
  	var currentBlendEquation = null
  	var currentBlendSrc = null
  	var currentBlendDst = null
  	var currentBlendEquationAlpha = null
  	var currentBlendSrcAlpha = null
  	var currentBlendDstAlpha = null
  	var currentPremultipledAlpha = false

  	var currentFlipSided = null
  	var currentCullFace = null

  	var currentLineWidth = null

  	var currentPolygonOffsetFactor = null
  	var currentPolygonOffsetUnits = null

  	var maxTextures = gl.getParameter(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS)

  	var lineWidthAvailable = false
  	var version = 0
  	var glVersion = gl.getParameter(gl.VERSION)

  	if (glVersion.indexOf('WebGL') !== -1) {
  		version = parseFloat(/^WebGL\ ([0-9])/.exec(glVersion)[1])
  		lineWidthAvailable = (version >= 1.0)
  	} else if (glVersion.indexOf('OpenGL ES') !== -1) {
  		version = parseFloat(/^OpenGL\ ES\ ([0-9])/.exec(glVersion)[1])
  		lineWidthAvailable = (version >= 2.0)
  	}

  	var currentTextureSlot = null
  	var currentBoundTextures = {}

  	var currentScissor = new Vector4()
  	var currentViewport = new Vector4()

  	function createTexture (type, target, count) {
  		var data = new Uint8Array(4) // 4 is required to match default unpack alignment of 4.
  		var texture = gl.createTexture()

  		gl.bindTexture(type, texture)
  		gl.texParameteri(type, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
  		gl.texParameteri(type, gl.TEXTURE_MAG_FILTER, gl.NEAREST)

  		for (var i = 0; i < count; i++) {
  			gl.texImage2D(target + i, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, data)
  		}

  		return texture
  	}

  	var emptyTextures = {}
  	emptyTextures[gl.TEXTURE_2D] = createTexture(gl.TEXTURE_2D, gl.TEXTURE_2D, 1)
  	emptyTextures[gl.TEXTURE_CUBE_MAP] = createTexture(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_CUBE_MAP_POSITIVE_X, 6)

  	// init

  	colorBuffer.setClear(0, 0, 0, 1)
  	depthBuffer.setClear(1)
  	stencilBuffer.setClear(0)

  	enable(gl.DEPTH_TEST)
  	depthBuffer.setFunc(LessEqualDepth)

  	setFlipSided(false)
  	setCullFace(CullFaceBack)
  	enable(gl.CULL_FACE)

  	enable(gl.BLEND)
  	setBlending(NormalBlending)

  	//

  	function initAttributes () {
  		for (var i = 0, l = newAttributes.length; i < l; i++) {
  			newAttributes[i] = 0
  		}
  	}

  	function enableAttribute (attribute) {
  		enableAttributeAndDivisor(attribute, 0)
  	}

  	function enableAttributeAndDivisor (attribute, meshPerAttribute) {
  		newAttributes[attribute] = 1

  		if (enabledAttributes[attribute] === 0) {
  			gl.enableVertexAttribArray(attribute)
  			enabledAttributes[attribute] = 1
  		}

  		if (attributeDivisors[attribute] !== meshPerAttribute) {
  			var extension = extensions.get('ANGLE_instanced_arrays')

  			extension.vertexAttribDivisorANGLE(attribute, meshPerAttribute)
  			attributeDivisors[attribute] = meshPerAttribute
  		}
  	}

  	function disableUnusedAttributes () {
  		for (var i = 0, l = enabledAttributes.length; i !== l; ++i) {
  			if (enabledAttributes[i] !== newAttributes[i]) {
  				gl.disableVertexAttribArray(i)
  				enabledAttributes[i] = 0
  			}
  		}
  	}

  	function enable (id) {
  		if (capabilities[id] !== true) {
  			gl.enable(id)
  			capabilities[id] = true
  		}
  	}

  	function disable (id) {
  		if (capabilities[id] !== false) {
  			gl.disable(id)
  			capabilities[id] = false
  		}
  	}

  	function getCompressedTextureFormats () {
  		if (compressedTextureFormats === null) {
  			compressedTextureFormats = []

  			if (extensions.get('WEBGL_compressed_texture_pvrtc') ||
  			     extensions.get('WEBGL_compressed_texture_s3tc') ||
  			     extensions.get('WEBGL_compressed_texture_etc1') ||
  			     extensions.get('WEBGL_compressed_texture_astc')) {
  				var formats = gl.getParameter(gl.COMPRESSED_TEXTURE_FORMATS)

  				for (var i = 0; i < formats.length; i++) {
  					compressedTextureFormats.push(formats[i])
  				}
  			}
  		}

  		return compressedTextureFormats
  	}

  	function useProgram (program) {
  		if (currentProgram !== program) {
  			gl.useProgram(program)

  			currentProgram = program

  			return true
  		}

  		return false
  	}

  	function setBlending (blending, blendEquation, blendSrc, blendDst, blendEquationAlpha, blendSrcAlpha, blendDstAlpha, premultipliedAlpha) {
  		if (blending !== NoBlending) {
  			enable(gl.BLEND)
  		} else {
  			disable(gl.BLEND)
  		}

  		if (blending !== CustomBlending) {
  			if (blending !== currentBlending || premultipliedAlpha !== currentPremultipledAlpha) {
  				switch (blending) {
  					case AdditiveBlending:

  						if (premultipliedAlpha) {
  							gl.blendEquationSeparate(gl.FUNC_ADD, gl.FUNC_ADD)
  							gl.blendFuncSeparate(gl.ONE, gl.ONE, gl.ONE, gl.ONE)
  						} else {
  							gl.blendEquation(gl.FUNC_ADD)
  							gl.blendFunc(gl.SRC_ALPHA, gl.ONE)
  						}
  						break

  					case SubtractiveBlending:

  						if (premultipliedAlpha) {
  							gl.blendEquationSeparate(gl.FUNC_ADD, gl.FUNC_ADD)
  							gl.blendFuncSeparate(gl.ZERO, gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ONE_MINUS_SRC_ALPHA)
  						} else {
  							gl.blendEquation(gl.FUNC_ADD)
  							gl.blendFunc(gl.ZERO, gl.ONE_MINUS_SRC_COLOR)
  						}
  						break

  					case MultiplyBlending:

  						if (premultipliedAlpha) {
  							gl.blendEquationSeparate(gl.FUNC_ADD, gl.FUNC_ADD)
  							gl.blendFuncSeparate(gl.ZERO, gl.SRC_COLOR, gl.ZERO, gl.SRC_ALPHA)
  						} else {
  							gl.blendEquation(gl.FUNC_ADD)
  							gl.blendFunc(gl.ZERO, gl.SRC_COLOR)
  						}
  						break

  					default:

  						if (premultipliedAlpha) {
  							gl.blendEquationSeparate(gl.FUNC_ADD, gl.FUNC_ADD)
  							gl.blendFuncSeparate(gl.ONE, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
  						} else {
  							gl.blendEquationSeparate(gl.FUNC_ADD, gl.FUNC_ADD)
  							gl.blendFuncSeparate(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
  						}
  				}
  			}

  			currentBlendEquation = null
  			currentBlendSrc = null
  			currentBlendDst = null
  			currentBlendEquationAlpha = null
  			currentBlendSrcAlpha = null
  			currentBlendDstAlpha = null
  		} else {
  			blendEquationAlpha = blendEquationAlpha || blendEquation
  			blendSrcAlpha = blendSrcAlpha || blendSrc
  			blendDstAlpha = blendDstAlpha || blendDst

  			if (blendEquation !== currentBlendEquation || blendEquationAlpha !== currentBlendEquationAlpha) {
  				gl.blendEquationSeparate(utils.convert(blendEquation), utils.convert(blendEquationAlpha))

  				currentBlendEquation = blendEquation
  				currentBlendEquationAlpha = blendEquationAlpha
  			}

  			if (blendSrc !== currentBlendSrc || blendDst !== currentBlendDst || blendSrcAlpha !== currentBlendSrcAlpha || blendDstAlpha !== currentBlendDstAlpha) {
  				gl.blendFuncSeparate(utils.convert(blendSrc), utils.convert(blendDst), utils.convert(blendSrcAlpha), utils.convert(blendDstAlpha))

  				currentBlendSrc = blendSrc
  				currentBlendDst = blendDst
  				currentBlendSrcAlpha = blendSrcAlpha
  				currentBlendDstAlpha = blendDstAlpha
  			}
  		}

  		currentBlending = blending
  		currentPremultipledAlpha = premultipliedAlpha
  	}

  	function setMaterial (material, frontFaceCW) {
  		material.side === DoubleSide
  			? disable(gl.CULL_FACE)
  			: enable(gl.CULL_FACE)

  		var flipSided = (material.side === BackSide)
  		if (frontFaceCW) flipSided = !flipSided

  		setFlipSided(flipSided)

  		material.transparent === true
  			? setBlending(material.blending, material.blendEquation, material.blendSrc, material.blendDst, material.blendEquationAlpha, material.blendSrcAlpha, material.blendDstAlpha, material.premultipliedAlpha)
  			: setBlending(NoBlending)

  		depthBuffer.setFunc(material.depthFunc)
  		depthBuffer.setTest(material.depthTest)
  		depthBuffer.setMask(material.depthWrite)
  		colorBuffer.setMask(material.colorWrite)

  		setPolygonOffset(material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits)
  	}

  	//

  	function setFlipSided (flipSided) {
  		if (currentFlipSided !== flipSided) {
  			if (flipSided) {
  				gl.frontFace(gl.CW)
  			} else {
  				gl.frontFace(gl.CCW)
  			}

  			currentFlipSided = flipSided
  		}
  	}

  	function setCullFace (cullFace) {
  		if (cullFace !== CullFaceNone) {
  			enable(gl.CULL_FACE)

  			if (cullFace !== currentCullFace) {
  				if (cullFace === CullFaceBack) {
  					gl.cullFace(gl.BACK)
  				} else if (cullFace === CullFaceFront) {
  					gl.cullFace(gl.FRONT)
  				} else {
  					gl.cullFace(gl.FRONT_AND_BACK)
  				}
  			}
  		} else {
  			disable(gl.CULL_FACE)
  		}

  		currentCullFace = cullFace
  	}

  	function setLineWidth (width) {
  		if (width !== currentLineWidth) {
  			if (lineWidthAvailable) gl.lineWidth(width)

  			currentLineWidth = width
  		}
  	}

  	function setPolygonOffset (polygonOffset, factor, units) {
  		if (polygonOffset) {
  			enable(gl.POLYGON_OFFSET_FILL)

  			if (currentPolygonOffsetFactor !== factor || currentPolygonOffsetUnits !== units) {
  				gl.polygonOffset(factor, units)

  				currentPolygonOffsetFactor = factor
  				currentPolygonOffsetUnits = units
  			}
  		} else {
  			disable(gl.POLYGON_OFFSET_FILL)
  		}
  	}

  	function setScissorTest (scissorTest) {
  		if (scissorTest) {
  			enable(gl.SCISSOR_TEST)
  		} else {
  			disable(gl.SCISSOR_TEST)
  		}
  	}

  	// texture

  	function activeTexture (webglSlot) {
  		if (webglSlot === undefined) webglSlot = gl.TEXTURE0 + maxTextures - 1

  		if (currentTextureSlot !== webglSlot) {
  			gl.activeTexture(webglSlot)
  			currentTextureSlot = webglSlot
  		}
  	}

  	function bindTexture (webglType, webglTexture) {
  		if (currentTextureSlot === null) {
  			activeTexture()
  		}

  		var boundTexture = currentBoundTextures[currentTextureSlot]

  		if (boundTexture === undefined) {
  			boundTexture = { type: undefined, texture: undefined }
  			currentBoundTextures[currentTextureSlot] = boundTexture
  		}

  		if (boundTexture.type !== webglType || boundTexture.texture !== webglTexture) {
  			gl.bindTexture(webglType, webglTexture || emptyTextures[webglType])

  			boundTexture.type = webglType
  			boundTexture.texture = webglTexture
  		}
  	}

  	function compressedTexImage2D () {
  		try {
  			gl.compressedTexImage2D.apply(gl, arguments)
  		} catch (error) {
  			console.error('THREE.WebGLState:', error)
  		}
  	}

  	function texImage2D () {
  		try {
  			gl.texImage2D.apply(gl, arguments)
  		} catch (error) {
  			console.error('THREE.WebGLState:', error)
  		}
  	}

  	//

  	function scissor (scissor) {
  		if (currentScissor.equals(scissor) === false) {
  			gl.scissor(scissor.x, scissor.y, scissor.z, scissor.w)
  			currentScissor.copy(scissor)
  		}
  	}

  	function viewport (viewport) {
  		if (currentViewport.equals(viewport) === false) {
  			gl.viewport(viewport.x, viewport.y, viewport.z, viewport.w)
  			currentViewport.copy(viewport)
  		}
  	}

  	//

  	function reset () {
  		for (var i = 0; i < enabledAttributes.length; i++) {
  			if (enabledAttributes[i] === 1) {
  				gl.disableVertexAttribArray(i)
  				enabledAttributes[i] = 0
  			}
  		}

  		capabilities = {}

  		compressedTextureFormats = null

  		currentTextureSlot = null
  		currentBoundTextures = {}

  		currentProgram = null

  		currentBlending = null

  		currentFlipSided = null
  		currentCullFace = null

  		colorBuffer.reset()
  		depthBuffer.reset()
  		stencilBuffer.reset()
  	}

  	return {

  		buffers: {
  			color: colorBuffer,
  			depth: depthBuffer,
  			stencil: stencilBuffer
  		},

  		initAttributes: initAttributes,
  		enableAttribute: enableAttribute,
  		enableAttributeAndDivisor: enableAttributeAndDivisor,
  		disableUnusedAttributes: disableUnusedAttributes,
  		enable: enable,
  		disable: disable,
  		getCompressedTextureFormats: getCompressedTextureFormats,

  		useProgram: useProgram,

  		setBlending: setBlending,
  		setMaterial: setMaterial,

  		setFlipSided: setFlipSided,
  		setCullFace: setCullFace,

  		setLineWidth: setLineWidth,
  		setPolygonOffset: setPolygonOffset,

  		setScissorTest: setScissorTest,

  		activeTexture: activeTexture,
  		bindTexture: bindTexture,
  		compressedTexImage2D: compressedTexImage2D,
  		texImage2D: texImage2D,

  		scissor: scissor,
  		viewport: viewport,

  		reset: reset

  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLTextures (_gl, extensions, state, properties, capabilities, utils, info) {
  	var _isWebGL2 = (typeof WebGL2RenderingContext !== 'undefined' && _gl instanceof WebGL2RenderingContext) /* global WebGL2RenderingContext */
  	var _videoTextures = {}
  	var _canvas

  	//

  	function clampToMaxSize (image, maxSize) {
  		if (image.width > maxSize || image.height > maxSize) {
  			if ('data' in image) {
  				console.warn('THREE.WebGLRenderer: image in DataTexture is too big (' + image.width + 'x' + image.height + ').')
  				return
  			}

  			// Warning: Scaling through the canvas will only work with images that use
  			// premultiplied alpha.

  			var scale = maxSize / Math.max(image.width, image.height)

  			var canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas')
  			canvas.width = Math.floor(image.width * scale)
  			canvas.height = Math.floor(image.height * scale)

  			var context = canvas.getContext('2d')
  			context.drawImage(image, 0, 0, image.width, image.height, 0, 0, canvas.width, canvas.height)

  			console.warn('THREE.WebGLRenderer: image is too big (' + image.width + 'x' + image.height + '). Resized to ' + canvas.width + 'x' + canvas.height, image)

  			return canvas
  		}

  		return image
  	}

  	function isPowerOfTwo (image) {
  		return _Math.isPowerOfTwo(image.width) && _Math.isPowerOfTwo(image.height)
  	}

  	function makePowerOfTwo (image) {
  		if (image instanceof HTMLImageElement || image instanceof HTMLCanvasElement || image instanceof ImageBitmap) {
  			if (_canvas === undefined) _canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas')

  			_canvas.width = _Math.floorPowerOfTwo(image.width)
  			_canvas.height = _Math.floorPowerOfTwo(image.height)

  			var context = _canvas.getContext('2d')
  			context.drawImage(image, 0, 0, _canvas.width, _canvas.height)

  			console.warn('THREE.WebGLRenderer: image is not power of two (' + image.width + 'x' + image.height + '). Resized to ' + _canvas.width + 'x' + _canvas.height, image)

  			return _canvas
  		}

  		return image
  	}

  	function textureNeedsPowerOfTwo (texture) {
  		return (texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping) ||
  			(texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter)
  	}

  	function textureNeedsGenerateMipmaps (texture, isPowerOfTwo) {
  		return texture.generateMipmaps && isPowerOfTwo &&
  			texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter
  	}

  	function generateMipmap (target, texture, width, height) {
  		_gl.generateMipmap(target)

  		var textureProperties = properties.get(texture)

  		// Note: Math.log( x ) * Math.LOG2E used instead of Math.log2( x ) which is not supported by IE11
  		textureProperties.__maxMipLevel = Math.log(Math.max(width, height)) * Math.LOG2E
  	}

  	// Fallback filters for non-power-of-2 textures

  	function filterFallback (f) {
  		if (f === NearestFilter || f === NearestMipMapNearestFilter || f === NearestMipMapLinearFilter) {
  			return _gl.NEAREST
  		}

  		return _gl.LINEAR
  	}

  	//

  	function onTextureDispose (event) {
  		var texture = event.target

  		texture.removeEventListener('dispose', onTextureDispose)

  		deallocateTexture(texture)

  		if (texture.isVideoTexture) {
  			delete _videoTextures[texture.id]
  		}

  		info.memory.textures--
  	}

  	function onRenderTargetDispose (event) {
  		var renderTarget = event.target

  		renderTarget.removeEventListener('dispose', onRenderTargetDispose)

  		deallocateRenderTarget(renderTarget)

  		info.memory.textures--
  	}

  	//

  	function deallocateTexture (texture) {
  		var textureProperties = properties.get(texture)

  		if (texture.image && textureProperties.__image__webglTextureCube) {
  			// cube texture

  			_gl.deleteTexture(textureProperties.__image__webglTextureCube)
  		} else {
  			// 2D texture

  			if (textureProperties.__webglInit === undefined) return

  			_gl.deleteTexture(textureProperties.__webglTexture)
  		}

  		// remove all webgl properties
  		properties.remove(texture)
  	}

  	function deallocateRenderTarget (renderTarget) {
  		var renderTargetProperties = properties.get(renderTarget)
  		var textureProperties = properties.get(renderTarget.texture)

  		if (!renderTarget) return

  		if (textureProperties.__webglTexture !== undefined) {
  			_gl.deleteTexture(textureProperties.__webglTexture)
  		}

  		if (renderTarget.depthTexture) {
  			renderTarget.depthTexture.dispose()
  		}

  		if (renderTarget.isWebGLRenderTargetCube) {
  			for (var i = 0; i < 6; i++) {
  				_gl.deleteFramebuffer(renderTargetProperties.__webglFramebuffer[i])
  				if (renderTargetProperties.__webglDepthbuffer) _gl.deleteRenderbuffer(renderTargetProperties.__webglDepthbuffer[i])
  			}
  		} else {
  			_gl.deleteFramebuffer(renderTargetProperties.__webglFramebuffer)
  			if (renderTargetProperties.__webglDepthbuffer) _gl.deleteRenderbuffer(renderTargetProperties.__webglDepthbuffer)
  		}

  		properties.remove(renderTarget.texture)
  		properties.remove(renderTarget)
  	}

  	//

  	function setTexture2D (texture, slot) {
  		var textureProperties = properties.get(texture)

  		if (texture.isVideoTexture) updateVideoTexture(texture)

  		if (texture.version > 0 && textureProperties.__version !== texture.version) {
  			var image = texture.image

  			if (image === undefined) {
  				console.warn('THREE.WebGLRenderer: Texture marked for update but image is undefined', texture)
  			} else if (image.complete === false) {
  				console.warn('THREE.WebGLRenderer: Texture marked for update but image is incomplete', texture)
  			} else {
  				uploadTexture(textureProperties, texture, slot)
  				return
  			}
  		}

  		state.activeTexture(_gl.TEXTURE0 + slot)
  		state.bindTexture(_gl.TEXTURE_2D, textureProperties.__webglTexture)
  	}

  	function setTextureCube (texture, slot) {
  		var textureProperties = properties.get(texture)

  		if (texture.image.length === 6) {
  			if (texture.version > 0 && textureProperties.__version !== texture.version) {
  				if (!textureProperties.__image__webglTextureCube) {
  					texture.addEventListener('dispose', onTextureDispose)

  					textureProperties.__image__webglTextureCube = _gl.createTexture()

  					info.memory.textures++
  				}

  				state.activeTexture(_gl.TEXTURE0 + slot)
  				state.bindTexture(_gl.TEXTURE_CUBE_MAP, textureProperties.__image__webglTextureCube)

  				_gl.pixelStorei(_gl.UNPACK_FLIP_Y_WEBGL, texture.flipY)

  				var isCompressed = (texture && texture.isCompressedTexture)
  				var isDataTexture = (texture.image[0] && texture.image[0].isDataTexture)

  				var cubeImage = []

  				for (var i = 0; i < 6; i++) {
  					if (!isCompressed && !isDataTexture) {
  						cubeImage[i] = clampToMaxSize(texture.image[i], capabilities.maxCubemapSize)
  					} else {
  						cubeImage[i] = isDataTexture ? texture.image[i].image : texture.image[i]
  					}
  				}

  				var image = cubeImage[0]
  					var isPowerOfTwoImage = isPowerOfTwo(image)
  					var glFormat = utils.convert(texture.format)
  					var glType = utils.convert(texture.type)

  				setTextureParameters(_gl.TEXTURE_CUBE_MAP, texture, isPowerOfTwoImage)

  				for (var i = 0; i < 6; i++) {
  					if (!isCompressed) {
  						if (isDataTexture) {
  							state.texImage2D(_gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glFormat, cubeImage[i].width, cubeImage[i].height, 0, glFormat, glType, cubeImage[i].data)
  						} else {
  							state.texImage2D(_gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, glFormat, glFormat, glType, cubeImage[i])
  						}
  					} else {
  						var mipmap; var mipmaps = cubeImage[i].mipmaps

  						for (var j = 0, jl = mipmaps.length; j < jl; j++) {
  							mipmap = mipmaps[j]

  							if (texture.format !== RGBAFormat && texture.format !== RGBFormat) {
  								if (state.getCompressedTextureFormats().indexOf(glFormat) > -1) {
  									state.compressedTexImage2D(_gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, glFormat, mipmap.width, mipmap.height, 0, mipmap.data)
  								} else {
  									console.warn('THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .setTextureCube()')
  								}
  							} else {
  								state.texImage2D(_gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, j, glFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data)
  							}
  						}
  					}
  				}

  				if (!isCompressed) {
  					textureProperties.__maxMipLevel = 0
  				} else {
  					textureProperties.__maxMipLevel = mipmaps.length - 1
  				}

  				if (textureNeedsGenerateMipmaps(texture, isPowerOfTwoImage)) {
  					// We assume images for cube map have the same size.
  					generateMipmap(_gl.TEXTURE_CUBE_MAP, texture, image.width, image.height)
  				}

  				textureProperties.__version = texture.version

  				if (texture.onUpdate) texture.onUpdate(texture)
  			} else {
  				state.activeTexture(_gl.TEXTURE0 + slot)
  				state.bindTexture(_gl.TEXTURE_CUBE_MAP, textureProperties.__image__webglTextureCube)
  			}
  		}
  	}

  	function setTextureCubeDynamic (texture, slot) {
  		state.activeTexture(_gl.TEXTURE0 + slot)
  		state.bindTexture(_gl.TEXTURE_CUBE_MAP, properties.get(texture).__webglTexture)
  	}

  	function setTextureParameters (textureType, texture, isPowerOfTwoImage) {
  		var extension

  		if (isPowerOfTwoImage) {
  			_gl.texParameteri(textureType, _gl.TEXTURE_WRAP_S, utils.convert(texture.wrapS))
  			_gl.texParameteri(textureType, _gl.TEXTURE_WRAP_T, utils.convert(texture.wrapT))

  			_gl.texParameteri(textureType, _gl.TEXTURE_MAG_FILTER, utils.convert(texture.magFilter))
  			_gl.texParameteri(textureType, _gl.TEXTURE_MIN_FILTER, utils.convert(texture.minFilter))
  		} else {
  			_gl.texParameteri(textureType, _gl.TEXTURE_WRAP_S, _gl.CLAMP_TO_EDGE)
  			_gl.texParameteri(textureType, _gl.TEXTURE_WRAP_T, _gl.CLAMP_TO_EDGE)

  			if (texture.wrapS !== ClampToEdgeWrapping || texture.wrapT !== ClampToEdgeWrapping) {
  				console.warn('THREE.WebGLRenderer: Texture is not power of two. Texture.wrapS and Texture.wrapT should be set to THREE.ClampToEdgeWrapping.', texture)
  			}

  			_gl.texParameteri(textureType, _gl.TEXTURE_MAG_FILTER, filterFallback(texture.magFilter))
  			_gl.texParameteri(textureType, _gl.TEXTURE_MIN_FILTER, filterFallback(texture.minFilter))

  			if (texture.minFilter !== NearestFilter && texture.minFilter !== LinearFilter) {
  				console.warn('THREE.WebGLRenderer: Texture is not power of two. Texture.minFilter should be set to THREE.NearestFilter or THREE.LinearFilter.', texture)
  			}
  		}

  		extension = extensions.get('EXT_texture_filter_anisotropic')

  		if (extension) {
  			if (texture.type === FloatType && extensions.get('OES_texture_float_linear') === null) return
  			if (texture.type === HalfFloatType && extensions.get('OES_texture_half_float_linear') === null) return

  			if (texture.anisotropy > 1 || properties.get(texture).__currentAnisotropy) {
  				_gl.texParameterf(textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min(texture.anisotropy, capabilities.getMaxAnisotropy()))
  				properties.get(texture).__currentAnisotropy = texture.anisotropy
  			}
  		}
  	}

  	function uploadTexture (textureProperties, texture, slot) {
  		if (textureProperties.__webglInit === undefined) {
  			textureProperties.__webglInit = true

  			texture.addEventListener('dispose', onTextureDispose)

  			textureProperties.__webglTexture = _gl.createTexture()

  			info.memory.textures++
  		}

  		state.activeTexture(_gl.TEXTURE0 + slot)
  		state.bindTexture(_gl.TEXTURE_2D, textureProperties.__webglTexture)

  		_gl.pixelStorei(_gl.UNPACK_FLIP_Y_WEBGL, texture.flipY)
  		_gl.pixelStorei(_gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha)
  		_gl.pixelStorei(_gl.UNPACK_ALIGNMENT, texture.unpackAlignment)

  		var image = clampToMaxSize(texture.image, capabilities.maxTextureSize)

  		if (textureNeedsPowerOfTwo(texture) && isPowerOfTwo(image) === false) {
  			image = makePowerOfTwo(image)
  		}

  		var isPowerOfTwoImage = isPowerOfTwo(image)
  			var glFormat = utils.convert(texture.format)
  			var glType = utils.convert(texture.type)

  		setTextureParameters(_gl.TEXTURE_2D, texture, isPowerOfTwoImage)

  		var mipmap; var mipmaps = texture.mipmaps

  		if (texture.isDepthTexture) {
  			// populate depth texture with dummy data

  			var internalFormat = _gl.DEPTH_COMPONENT

  			if (texture.type === FloatType) {
  				if (!_isWebGL2) throw new Error('Float Depth Texture only supported in WebGL2.0')
  				internalFormat = _gl.DEPTH_COMPONENT32F
  			} else if (_isWebGL2) {
  				// WebGL 2.0 requires signed internalformat for glTexImage2D
  				internalFormat = _gl.DEPTH_COMPONENT16
  			}

  			if (texture.format === DepthFormat && internalFormat === _gl.DEPTH_COMPONENT) {
  				// The error INVALID_OPERATION is generated by texImage2D if format and internalformat are
  				// DEPTH_COMPONENT and type is not UNSIGNED_SHORT or UNSIGNED_INT
  				// (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
  				if (texture.type !== UnsignedShortType && texture.type !== UnsignedIntType) {
  					console.warn('THREE.WebGLRenderer: Use UnsignedShortType or UnsignedIntType for DepthFormat DepthTexture.')

  					texture.type = UnsignedShortType
  					glType = utils.convert(texture.type)
  				}
  			}

  			// Depth stencil textures need the DEPTH_STENCIL internal format
  			// (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
  			if (texture.format === DepthStencilFormat) {
  				internalFormat = _gl.DEPTH_STENCIL

  				// The error INVALID_OPERATION is generated by texImage2D if format and internalformat are
  				// DEPTH_STENCIL and type is not UNSIGNED_INT_24_8_WEBGL.
  				// (https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/)
  				if (texture.type !== UnsignedInt248Type) {
  					console.warn('THREE.WebGLRenderer: Use UnsignedInt248Type for DepthStencilFormat DepthTexture.')

  					texture.type = UnsignedInt248Type
  					glType = utils.convert(texture.type)
  				}
  			}

  			state.texImage2D(_gl.TEXTURE_2D, 0, internalFormat, image.width, image.height, 0, glFormat, glType, null)
  		} else if (texture.isDataTexture) {
  			// use manually created mipmaps if available
  			// if there are no manual mipmaps
  			// set 0 level mipmap and then use GL to generate other mipmap levels

  			if (mipmaps.length > 0 && isPowerOfTwoImage) {
  				for (var i = 0, il = mipmaps.length; i < il; i++) {
  					mipmap = mipmaps[i]
  					state.texImage2D(_gl.TEXTURE_2D, i, glFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data)
  				}

  				texture.generateMipmaps = false
  				textureProperties.__maxMipLevel = mipmaps.length - 1
  			} else {
  				state.texImage2D(_gl.TEXTURE_2D, 0, glFormat, image.width, image.height, 0, glFormat, glType, image.data)
  				textureProperties.__maxMipLevel = 0
  			}
  		} else if (texture.isCompressedTexture) {
  			for (var i = 0, il = mipmaps.length; i < il; i++) {
  				mipmap = mipmaps[i]

  				if (texture.format !== RGBAFormat && texture.format !== RGBFormat) {
  					if (state.getCompressedTextureFormats().indexOf(glFormat) > -1) {
  						state.compressedTexImage2D(_gl.TEXTURE_2D, i, glFormat, mipmap.width, mipmap.height, 0, mipmap.data)
  					} else {
  						console.warn('THREE.WebGLRenderer: Attempt to load unsupported compressed texture format in .uploadTexture()')
  					}
  				} else {
  					state.texImage2D(_gl.TEXTURE_2D, i, glFormat, mipmap.width, mipmap.height, 0, glFormat, glType, mipmap.data)
  				}
  			}

  			textureProperties.__maxMipLevel = mipmaps.length - 1
  		} else {
  			// regular Texture (image, video, canvas)

  			// use manually created mipmaps if available
  			// if there are no manual mipmaps
  			// set 0 level mipmap and then use GL to generate other mipmap levels

  			if (mipmaps.length > 0 && isPowerOfTwoImage) {
  				for (var i = 0, il = mipmaps.length; i < il; i++) {
  					mipmap = mipmaps[i]
  					state.texImage2D(_gl.TEXTURE_2D, i, glFormat, glFormat, glType, mipmap)
  				}

  				texture.generateMipmaps = false
  				textureProperties.__maxMipLevel = mipmaps.length - 1
  			} else {
  				state.texImage2D(_gl.TEXTURE_2D, 0, glFormat, glFormat, glType, image)
  				textureProperties.__maxMipLevel = 0
  			}
  		}

  		if (textureNeedsGenerateMipmaps(texture, isPowerOfTwoImage)) {
  			generateMipmap(_gl.TEXTURE_2D, texture, image.width, image.height)
  		}

  		textureProperties.__version = texture.version

  		if (texture.onUpdate) texture.onUpdate(texture)
  	}

  	// Render targets

  	// Setup storage for target texture and bind it to correct framebuffer
  	function setupFrameBufferTexture (framebuffer, renderTarget, attachment, textureTarget) {
  		var glFormat = utils.convert(renderTarget.texture.format)
  		var glType = utils.convert(renderTarget.texture.type)
  		state.texImage2D(textureTarget, 0, glFormat, renderTarget.width, renderTarget.height, 0, glFormat, glType, null)
  		_gl.bindFramebuffer(_gl.FRAMEBUFFER, framebuffer)
  		_gl.framebufferTexture2D(_gl.FRAMEBUFFER, attachment, textureTarget, properties.get(renderTarget.texture).__webglTexture, 0)
  		_gl.bindFramebuffer(_gl.FRAMEBUFFER, null)
  	}

  	// Setup storage for internal depth/stencil buffers and bind to correct framebuffer
  	function setupRenderBufferStorage (renderbuffer, renderTarget) {
  		_gl.bindRenderbuffer(_gl.RENDERBUFFER, renderbuffer)

  		if (renderTarget.depthBuffer && !renderTarget.stencilBuffer) {
  			_gl.renderbufferStorage(_gl.RENDERBUFFER, _gl.DEPTH_COMPONENT16, renderTarget.width, renderTarget.height)
  			_gl.framebufferRenderbuffer(_gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer)
  		} else if (renderTarget.depthBuffer && renderTarget.stencilBuffer) {
  			_gl.renderbufferStorage(_gl.RENDERBUFFER, _gl.DEPTH_STENCIL, renderTarget.width, renderTarget.height)
  			_gl.framebufferRenderbuffer(_gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.RENDERBUFFER, renderbuffer)
  		} else {
  			// FIXME: We don't support !depth !stencil
  			_gl.renderbufferStorage(_gl.RENDERBUFFER, _gl.RGBA4, renderTarget.width, renderTarget.height)
  		}

  		_gl.bindRenderbuffer(_gl.RENDERBUFFER, null)
  	}

  	// Setup resources for a Depth Texture for a FBO (needs an extension)
  	function setupDepthTexture (framebuffer, renderTarget) {
  		var isCube = (renderTarget && renderTarget.isWebGLRenderTargetCube)
  		if (isCube) throw new Error('Depth Texture with cube render targets is not supported')

  		_gl.bindFramebuffer(_gl.FRAMEBUFFER, framebuffer)

  		if (!(renderTarget.depthTexture && renderTarget.depthTexture.isDepthTexture)) {
  			throw new Error('renderTarget.depthTexture must be an instance of THREE.DepthTexture')
  		}

  		// upload an empty depth texture with framebuffer size
  		if (!properties.get(renderTarget.depthTexture).__webglTexture ||
  				renderTarget.depthTexture.image.width !== renderTarget.width ||
  				renderTarget.depthTexture.image.height !== renderTarget.height) {
  			renderTarget.depthTexture.image.width = renderTarget.width
  			renderTarget.depthTexture.image.height = renderTarget.height
  			renderTarget.depthTexture.needsUpdate = true
  		}

  		setTexture2D(renderTarget.depthTexture, 0)

  		var webglDepthTexture = properties.get(renderTarget.depthTexture).__webglTexture

  		if (renderTarget.depthTexture.format === DepthFormat) {
  			_gl.framebufferTexture2D(_gl.FRAMEBUFFER, _gl.DEPTH_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0)
  		} else if (renderTarget.depthTexture.format === DepthStencilFormat) {
  			_gl.framebufferTexture2D(_gl.FRAMEBUFFER, _gl.DEPTH_STENCIL_ATTACHMENT, _gl.TEXTURE_2D, webglDepthTexture, 0)
  		} else {
  			throw new Error('Unknown depthTexture format')
  		}
  	}

  	// Setup GL resources for a non-texture depth buffer
  	function setupDepthRenderbuffer (renderTarget) {
  		var renderTargetProperties = properties.get(renderTarget)

  		var isCube = (renderTarget.isWebGLRenderTargetCube === true)

  		if (renderTarget.depthTexture) {
  			if (isCube) throw new Error('target.depthTexture not supported in Cube render targets')

  			setupDepthTexture(renderTargetProperties.__webglFramebuffer, renderTarget)
  		} else {
  			if (isCube) {
  				renderTargetProperties.__webglDepthbuffer = []

  				for (var i = 0; i < 6; i++) {
  					_gl.bindFramebuffer(_gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer[i])
  					renderTargetProperties.__webglDepthbuffer[i] = _gl.createRenderbuffer()
  					setupRenderBufferStorage(renderTargetProperties.__webglDepthbuffer[i], renderTarget)
  				}
  			} else {
  				_gl.bindFramebuffer(_gl.FRAMEBUFFER, renderTargetProperties.__webglFramebuffer)
  				renderTargetProperties.__webglDepthbuffer = _gl.createRenderbuffer()
  				setupRenderBufferStorage(renderTargetProperties.__webglDepthbuffer, renderTarget)
  			}
  		}

  		_gl.bindFramebuffer(_gl.FRAMEBUFFER, null)
  	}

  	// Set up GL resources for the render target
  	function setupRenderTarget (renderTarget) {
  		var renderTargetProperties = properties.get(renderTarget)
  		var textureProperties = properties.get(renderTarget.texture)

  		renderTarget.addEventListener('dispose', onRenderTargetDispose)

  		textureProperties.__webglTexture = _gl.createTexture()

  		info.memory.textures++

  		var isCube = (renderTarget.isWebGLRenderTargetCube === true)
  		var isTargetPowerOfTwo = isPowerOfTwo(renderTarget)

  		// Setup framebuffer

  		if (isCube) {
  			renderTargetProperties.__webglFramebuffer = []

  			for (var i = 0; i < 6; i++) {
  				renderTargetProperties.__webglFramebuffer[i] = _gl.createFramebuffer()
  			}
  		} else {
  			renderTargetProperties.__webglFramebuffer = _gl.createFramebuffer()
  		}

  		// Setup color buffer

  		if (isCube) {
  			state.bindTexture(_gl.TEXTURE_CUBE_MAP, textureProperties.__webglTexture)
  			setTextureParameters(_gl.TEXTURE_CUBE_MAP, renderTarget.texture, isTargetPowerOfTwo)

  			for (var i = 0; i < 6; i++) {
  				setupFrameBufferTexture(renderTargetProperties.__webglFramebuffer[i], renderTarget, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + i)
  			}

  			if (textureNeedsGenerateMipmaps(renderTarget.texture, isTargetPowerOfTwo)) {
  				generateMipmap(_gl.TEXTURE_CUBE_MAP, renderTarget.texture, renderTarget.width, renderTarget.height)
  			}

  			state.bindTexture(_gl.TEXTURE_CUBE_MAP, null)
  		} else {
  			state.bindTexture(_gl.TEXTURE_2D, textureProperties.__webglTexture)
  			setTextureParameters(_gl.TEXTURE_2D, renderTarget.texture, isTargetPowerOfTwo)
  			setupFrameBufferTexture(renderTargetProperties.__webglFramebuffer, renderTarget, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_2D)

  			if (textureNeedsGenerateMipmaps(renderTarget.texture, isTargetPowerOfTwo)) {
  				generateMipmap(_gl.TEXTURE_2D, renderTarget.texture, renderTarget.width, renderTarget.height)
  			}

  			state.bindTexture(_gl.TEXTURE_2D, null)
  		}

  		// Setup depth and stencil buffers

  		if (renderTarget.depthBuffer) {
  			setupDepthRenderbuffer(renderTarget)
  		}
  	}

  	function updateRenderTargetMipmap (renderTarget) {
  		var texture = renderTarget.texture
  		var isTargetPowerOfTwo = isPowerOfTwo(renderTarget)

  		if (textureNeedsGenerateMipmaps(texture, isTargetPowerOfTwo)) {
  			var target = renderTarget.isWebGLRenderTargetCube ? _gl.TEXTURE_CUBE_MAP : _gl.TEXTURE_2D
  			var webglTexture = properties.get(texture).__webglTexture

  			state.bindTexture(target, webglTexture)
  			generateMipmap(target, texture, renderTarget.width, renderTarget.height)
  			state.bindTexture(target, null)
  		}
  	}

  	function updateVideoTexture (texture) {
  		var id = texture.id
  		var frame = info.render.frame

  		// Check the last frame we updated the VideoTexture

  		if (_videoTextures[id] !== frame) {
  			_videoTextures[id] = frame
  			texture.update()
  		}
  	}

  	this.setTexture2D = setTexture2D
  	this.setTextureCube = setTextureCube
  	this.setTextureCubeDynamic = setTextureCubeDynamic
  	this.setupRenderTarget = setupRenderTarget
  	this.updateRenderTargetMipmap = updateRenderTargetMipmap
  }

  /**
   * @author thespite / http://www.twitter.com/thespite
   */

  function WebGLUtils (gl, extensions) {
  	function convert (p) {
  		var extension

  		if (p === RepeatWrapping) return gl.REPEAT
  		if (p === ClampToEdgeWrapping) return gl.CLAMP_TO_EDGE
  		if (p === MirroredRepeatWrapping) return gl.MIRRORED_REPEAT

  		if (p === NearestFilter) return gl.NEAREST
  		if (p === NearestMipMapNearestFilter) return gl.NEAREST_MIPMAP_NEAREST
  		if (p === NearestMipMapLinearFilter) return gl.NEAREST_MIPMAP_LINEAR

  		if (p === LinearFilter) return gl.LINEAR
  		if (p === LinearMipMapNearestFilter) return gl.LINEAR_MIPMAP_NEAREST
  		if (p === LinearMipMapLinearFilter) return gl.LINEAR_MIPMAP_LINEAR

  		if (p === UnsignedByteType) return gl.UNSIGNED_BYTE
  		if (p === UnsignedShort4444Type) return gl.UNSIGNED_SHORT_4_4_4_4
  		if (p === UnsignedShort5551Type) return gl.UNSIGNED_SHORT_5_5_5_1
  		if (p === UnsignedShort565Type) return gl.UNSIGNED_SHORT_5_6_5

  		if (p === ByteType) return gl.BYTE
  		if (p === ShortType) return gl.SHORT
  		if (p === UnsignedShortType) return gl.UNSIGNED_SHORT
  		if (p === IntType) return gl.INT
  		if (p === UnsignedIntType) return gl.UNSIGNED_INT
  		if (p === FloatType) return gl.FLOAT

  		if (p === HalfFloatType) {
  			extension = extensions.get('OES_texture_half_float')

  			if (extension !== null) return extension.HALF_FLOAT_OES
  		}

  		if (p === AlphaFormat) return gl.ALPHA
  		if (p === RGBFormat) return gl.RGB
  		if (p === RGBAFormat) return gl.RGBA
  		if (p === LuminanceFormat) return gl.LUMINANCE
  		if (p === LuminanceAlphaFormat) return gl.LUMINANCE_ALPHA
  		if (p === DepthFormat) return gl.DEPTH_COMPONENT
  		if (p === DepthStencilFormat) return gl.DEPTH_STENCIL

  		if (p === AddEquation) return gl.FUNC_ADD
  		if (p === SubtractEquation) return gl.FUNC_SUBTRACT
  		if (p === ReverseSubtractEquation) return gl.FUNC_REVERSE_SUBTRACT

  		if (p === ZeroFactor) return gl.ZERO
  		if (p === OneFactor) return gl.ONE
  		if (p === SrcColorFactor) return gl.SRC_COLOR
  		if (p === OneMinusSrcColorFactor) return gl.ONE_MINUS_SRC_COLOR
  		if (p === SrcAlphaFactor) return gl.SRC_ALPHA
  		if (p === OneMinusSrcAlphaFactor) return gl.ONE_MINUS_SRC_ALPHA
  		if (p === DstAlphaFactor) return gl.DST_ALPHA
  		if (p === OneMinusDstAlphaFactor) return gl.ONE_MINUS_DST_ALPHA

  		if (p === DstColorFactor) return gl.DST_COLOR
  		if (p === OneMinusDstColorFactor) return gl.ONE_MINUS_DST_COLOR
  		if (p === SrcAlphaSaturateFactor) return gl.SRC_ALPHA_SATURATE

  		if (p === RGB_S3TC_DXT1_Format || p === RGBA_S3TC_DXT1_Format ||
  			p === RGBA_S3TC_DXT3_Format || p === RGBA_S3TC_DXT5_Format) {
  			extension = extensions.get('WEBGL_compressed_texture_s3tc')

  			if (extension !== null) {
  				if (p === RGB_S3TC_DXT1_Format) return extension.COMPRESSED_RGB_S3TC_DXT1_EXT
  				if (p === RGBA_S3TC_DXT1_Format) return extension.COMPRESSED_RGBA_S3TC_DXT1_EXT
  				if (p === RGBA_S3TC_DXT3_Format) return extension.COMPRESSED_RGBA_S3TC_DXT3_EXT
  				if (p === RGBA_S3TC_DXT5_Format) return extension.COMPRESSED_RGBA_S3TC_DXT5_EXT
  			}
  		}

  		if (p === RGB_PVRTC_4BPPV1_Format || p === RGB_PVRTC_2BPPV1_Format ||
  			p === RGBA_PVRTC_4BPPV1_Format || p === RGBA_PVRTC_2BPPV1_Format) {
  			extension = extensions.get('WEBGL_compressed_texture_pvrtc')

  			if (extension !== null) {
  				if (p === RGB_PVRTC_4BPPV1_Format) return extension.COMPRESSED_RGB_PVRTC_4BPPV1_IMG
  				if (p === RGB_PVRTC_2BPPV1_Format) return extension.COMPRESSED_RGB_PVRTC_2BPPV1_IMG
  				if (p === RGBA_PVRTC_4BPPV1_Format) return extension.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG
  				if (p === RGBA_PVRTC_2BPPV1_Format) return extension.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG
  			}
  		}

  		if (p === RGB_ETC1_Format) {
  			extension = extensions.get('WEBGL_compressed_texture_etc1')

  			if (extension !== null) return extension.COMPRESSED_RGB_ETC1_WEBGL
  		}

  		if (p === RGBA_ASTC_4x4_Format || p === RGBA_ASTC_5x4_Format || p === RGBA_ASTC_5x5_Format ||
  			p === RGBA_ASTC_6x5_Format || p === RGBA_ASTC_6x6_Format || p === RGBA_ASTC_8x5_Format ||
  			p === RGBA_ASTC_8x6_Format || p === RGBA_ASTC_8x8_Format || p === RGBA_ASTC_10x5_Format ||
  			p === RGBA_ASTC_10x6_Format || p === RGBA_ASTC_10x8_Format || p === RGBA_ASTC_10x10_Format ||
  			p === RGBA_ASTC_12x10_Format || p === RGBA_ASTC_12x12_Format) {
  			extension = extensions.get('WEBGL_compressed_texture_astc')

  			if (extension !== null) {
  				return p
  			}
  		}

  		if (p === MinEquation || p === MaxEquation) {
  			extension = extensions.get('EXT_blend_minmax')

  			if (extension !== null) {
  				if (p === MinEquation) return extension.MIN_EXT
  				if (p === MaxEquation) return extension.MAX_EXT
  			}
  		}

  		if (p === UnsignedInt248Type) {
  			extension = extensions.get('WEBGL_depth_texture')

  			if (extension !== null) return extension.UNSIGNED_INT_24_8_WEBGL
  		}

  		return 0
  	}

  	return { convert: convert }
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author greggman / http://games.greggman.com/
   * @author zz85 / http://www.lab4games.net/zz85/blog
   * @author tschw
   */

  function PerspectiveCamera (fov, aspect, near, far) {
  	Camera.call(this)

  	this.type = 'PerspectiveCamera'

  	this.fov = fov !== undefined ? fov : 50
  	this.zoom = 1

  	this.near = near !== undefined ? near : 0.1
  	this.far = far !== undefined ? far : 2000
  	this.focus = 10

  	this.aspect = aspect !== undefined ? aspect : 1
  	this.view = null

  	this.filmGauge = 35	// width of the film (default in millimeters)
  	this.filmOffset = 0	// horizontal film offset (same unit as gauge)

  	this.updateProjectionMatrix()
  }

  PerspectiveCamera.prototype = Object.assign(Object.create(Camera.prototype), {

  	constructor: PerspectiveCamera,

  	isPerspectiveCamera: true,

  	copy: function (source, recursive) {
  		Camera.prototype.copy.call(this, source, recursive)

  		this.fov = source.fov
  		this.zoom = source.zoom

  		this.near = source.near
  		this.far = source.far
  		this.focus = source.focus

  		this.aspect = source.aspect
  		this.view = source.view === null ? null : Object.assign({}, source.view)

  		this.filmGauge = source.filmGauge
  		this.filmOffset = source.filmOffset

  		return this
  	},

  	/**
  	 * Sets the FOV by focal length in respect to the current .filmGauge.
  	 *
  	 * The default film gauge is 35, so that the focal length can be specified for
  	 * a 35mm (full frame) camera.
  	 *
  	 * Values for focal length and film gauge must have the same unit.
  	 */
  	setFocalLength: function (focalLength) {
  		// see http://www.bobatkins.com/photography/technical/field_of_view.html
  		var vExtentSlope = 0.5 * this.getFilmHeight() / focalLength

  		this.fov = _Math.RAD2DEG * 2 * Math.atan(vExtentSlope)
  		this.updateProjectionMatrix()
  	},

  	/**
  	 * Calculates the focal length from the current .fov and .filmGauge.
  	 */
  	getFocalLength: function () {
  		var vExtentSlope = Math.tan(_Math.DEG2RAD * 0.5 * this.fov)

  		return 0.5 * this.getFilmHeight() / vExtentSlope
  	},

  	getEffectiveFOV: function () {
  		return _Math.RAD2DEG * 2 * Math.atan(
  			Math.tan(_Math.DEG2RAD * 0.5 * this.fov) / this.zoom)
  	},

  	getFilmWidth: function () {
  		// film not completely covered in portrait format (aspect < 1)
  		return this.filmGauge * Math.min(this.aspect, 1)
  	},

  	getFilmHeight: function () {
  		// film not completely covered in landscape format (aspect > 1)
  		return this.filmGauge / Math.max(this.aspect, 1)
  	},

  	/**
  	 * Sets an offset in a larger frustum. This is useful for multi-window or
  	 * multi-monitor/multi-machine setups.
  	 *
  	 * For example, if you have 3x2 monitors and each monitor is 1920x1080 and
  	 * the monitors are in grid like this
  	 *
  	 *   +---+---+---+
  	 *   | A | B | C |
  	 *   +---+---+---+
  	 *   | D | E | F |
  	 *   +---+---+---+
  	 *
  	 * then for each monitor you would call it like this
  	 *
  	 *   var w = 1920;
  	 *   var h = 1080;
  	 *   var fullWidth = w * 3;
  	 *   var fullHeight = h * 2;
  	 *
  	 *   --A--
  	 *   camera.setOffset( fullWidth, fullHeight, w * 0, h * 0, w, h );
  	 *   --B--
  	 *   camera.setOffset( fullWidth, fullHeight, w * 1, h * 0, w, h );
  	 *   --C--
  	 *   camera.setOffset( fullWidth, fullHeight, w * 2, h * 0, w, h );
  	 *   --D--
  	 *   camera.setOffset( fullWidth, fullHeight, w * 0, h * 1, w, h );
  	 *   --E--
  	 *   camera.setOffset( fullWidth, fullHeight, w * 1, h * 1, w, h );
  	 *   --F--
  	 *   camera.setOffset( fullWidth, fullHeight, w * 2, h * 1, w, h );
  	 *
  	 *   Note there is no reason monitors have to be the same size or in a grid.
  	 */
  	setViewOffset: function (fullWidth, fullHeight, x, y, width, height) {
  		this.aspect = fullWidth / fullHeight

  		if (this.view === null) {
  			this.view = {
  				enabled: true,
  				fullWidth: 1,
  				fullHeight: 1,
  				offsetX: 0,
  				offsetY: 0,
  				width: 1,
  				height: 1
  			}
  		}

  		this.view.enabled = true
  		this.view.fullWidth = fullWidth
  		this.view.fullHeight = fullHeight
  		this.view.offsetX = x
  		this.view.offsetY = y
  		this.view.width = width
  		this.view.height = height

  		this.updateProjectionMatrix()
  	},

  	clearViewOffset: function () {
  		if (this.view !== null) {
  			this.view.enabled = false
  		}

  		this.updateProjectionMatrix()
  	},

  	updateProjectionMatrix: function () {
  		var near = this.near
  			var top = near * Math.tan(
  				_Math.DEG2RAD * 0.5 * this.fov) / this.zoom
  			var height = 2 * top
  			var width = this.aspect * height
  			var left = -0.5 * width
  			var view = this.view

  		if (this.view !== null && this.view.enabled) {
  			var fullWidth = view.fullWidth
  				var fullHeight = view.fullHeight

  			left += view.offsetX * width / fullWidth
  			top -= view.offsetY * height / fullHeight
  			width *= view.width / fullWidth
  			height *= view.height / fullHeight
  		}

  		var skew = this.filmOffset
  		if (skew !== 0) left += near * skew / this.getFilmWidth()

  		this.projectionMatrix.makePerspective(left, left + width, top, top - height, near, this.far)
  	},

  	toJSON: function (meta) {
  		var data = Object3D.prototype.toJSON.call(this, meta)

  		data.object.fov = this.fov
  		data.object.zoom = this.zoom

  		data.object.near = this.near
  		data.object.far = this.far
  		data.object.focus = this.focus

  		data.object.aspect = this.aspect

  		if (this.view !== null) data.object.view = Object.assign({}, this.view)

  		data.object.filmGauge = this.filmGauge
  		data.object.filmOffset = this.filmOffset

  		return data
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function ArrayCamera (array) {
  	PerspectiveCamera.call(this)

  	this.cameras = array || []
  }

  ArrayCamera.prototype = Object.assign(Object.create(PerspectiveCamera.prototype), {

  	constructor: ArrayCamera,

  	isArrayCamera: true

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebVRManager (renderer) {
  	var scope = this

  	var device = null
  	var frameData = null

  	var poseTarget = null

  	var standingMatrix = new Matrix4()
  	var standingMatrixInverse = new Matrix4()

  	if (typeof window !== 'undefined' && 'VRFrameData' in window) {
  		frameData = new window.VRFrameData()
  		window.addEventListener('vrdisplaypresentchange', onVRDisplayPresentChange, false)
  	}

  	var matrixWorldInverse = new Matrix4()
  	var tempQuaternion = new Quaternion()
  	var tempPosition = new Vector3()

  	var cameraL = new PerspectiveCamera()
  	cameraL.bounds = new Vector4(0.0, 0.0, 0.5, 1.0)
  	cameraL.layers.enable(1)

  	var cameraR = new PerspectiveCamera()
  	cameraR.bounds = new Vector4(0.5, 0.0, 0.5, 1.0)
  	cameraR.layers.enable(2)

  	var cameraVR = new ArrayCamera([cameraL, cameraR])
  	cameraVR.layers.enable(1)
  	cameraVR.layers.enable(2)

  	//

  	function isPresenting () {
  		return device !== null && device.isPresenting === true
  	}

  	var currentSize, currentPixelRatio

  	function onVRDisplayPresentChange () {
  		if (isPresenting()) {
  			var eyeParameters = device.getEyeParameters('left')
  			var renderWidth = eyeParameters.renderWidth
  			var renderHeight = eyeParameters.renderHeight

  			currentPixelRatio = renderer.getPixelRatio()
  			currentSize = renderer.getSize()

  			renderer.setDrawingBufferSize(renderWidth * 2, renderHeight, 1)

  			animation.start()
  		} else if (scope.enabled) {
  			renderer.setDrawingBufferSize(currentSize.width, currentSize.height, currentPixelRatio)

  			animation.stop()
  		}
  	}

  	//

  	this.enabled = false
  	this.userHeight = 1.6

  	this.getDevice = function () {
  		return device
  	}

  	this.setDevice = function (value) {
  		if (value !== undefined) device = value

  		animation.setContext(value)
  	}

  	this.setPoseTarget = function (object) {
  		if (object !== undefined) poseTarget = object
  	}

  	this.getCamera = function (camera) {
  		if (device === null) return camera

  		device.depthNear = camera.near
  		device.depthFar = camera.far

  		device.getFrameData(frameData)

  		//

  		var stageParameters = device.stageParameters

  		if (stageParameters) {
  			standingMatrix.fromArray(stageParameters.sittingToStandingTransform)
  		} else {
  			standingMatrix.makeTranslation(0, scope.userHeight, 0)
  		}

  		var pose = frameData.pose
  		var poseObject = poseTarget !== null ? poseTarget : camera

  		// We want to manipulate poseObject by its position and quaternion components since users may rely on them.
  		poseObject.matrix.copy(standingMatrix)
  		poseObject.matrix.decompose(poseObject.position, poseObject.quaternion, poseObject.scale)

  		if (pose.orientation !== null) {
  			tempQuaternion.fromArray(pose.orientation)
  			poseObject.quaternion.multiply(tempQuaternion)
  		}

  		if (pose.position !== null) {
  			tempQuaternion.setFromRotationMatrix(standingMatrix)
  			tempPosition.fromArray(pose.position)
  			tempPosition.applyQuaternion(tempQuaternion)
  			poseObject.position.add(tempPosition)
  		}

  		poseObject.updateMatrixWorld()

  		if (device.isPresenting === false) return camera

  		//

  		cameraL.near = camera.near
  		cameraR.near = camera.near

  		cameraL.far = camera.far
  		cameraR.far = camera.far

  		cameraVR.matrixWorld.copy(camera.matrixWorld)
  		cameraVR.matrixWorldInverse.copy(camera.matrixWorldInverse)

  		cameraL.matrixWorldInverse.fromArray(frameData.leftViewMatrix)
  		cameraR.matrixWorldInverse.fromArray(frameData.rightViewMatrix)

  		// TODO (mrdoob) Double check this code

  		standingMatrixInverse.getInverse(standingMatrix)

  		cameraL.matrixWorldInverse.multiply(standingMatrixInverse)
  		cameraR.matrixWorldInverse.multiply(standingMatrixInverse)

  		var parent = poseObject.parent

  		if (parent !== null) {
  			matrixWorldInverse.getInverse(parent.matrixWorld)

  			cameraL.matrixWorldInverse.multiply(matrixWorldInverse)
  			cameraR.matrixWorldInverse.multiply(matrixWorldInverse)
  		}

  		// envMap and Mirror needs camera.matrixWorld

  		cameraL.matrixWorld.getInverse(cameraL.matrixWorldInverse)
  		cameraR.matrixWorld.getInverse(cameraR.matrixWorldInverse)

  		cameraL.projectionMatrix.fromArray(frameData.leftProjectionMatrix)
  		cameraR.projectionMatrix.fromArray(frameData.rightProjectionMatrix)

  		// HACK (mrdoob)
  		// https://github.com/w3c/webvr/issues/203

  		cameraVR.projectionMatrix.copy(cameraL.projectionMatrix)

  		//

  		var layers = device.getLayers()

  		if (layers.length) {
  			var layer = layers[0]

  			if (layer.leftBounds !== null && layer.leftBounds.length === 4) {
  				cameraL.bounds.fromArray(layer.leftBounds)
  			}

  			if (layer.rightBounds !== null && layer.rightBounds.length === 4) {
  				cameraR.bounds.fromArray(layer.rightBounds)
  			}
  		}

  		return cameraVR
  	}

  	this.getStandingMatrix = function () {
  		return standingMatrix
  	}

  	this.isPresenting = isPresenting

  	// Animation Loop

  	var animation = new WebGLAnimation()

  	this.setAnimationLoop = function (callback) {
  		animation.setAnimationLoop(callback)
  	}

  	this.submitFrame = function () {
  		if (isPresenting()) device.submitFrame()
  	}

  	this.dispose = function () {
  		if (typeof window !== 'undefined') {
  			window.removeEventListener('vrdisplaypresentchange', onVRDisplayPresentChange)
  		}
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebXRManager (renderer) {
  	var gl = renderer.context

  	var device = null
  	var session = null

  	var frameOfRef = null

  	var pose = null

  	function isPresenting () {
  		return session !== null && frameOfRef !== null
  	}

  	//

  	var cameraL = new PerspectiveCamera()
  	cameraL.layers.enable(1)
  	cameraL.viewport = new Vector4()

  	var cameraR = new PerspectiveCamera()
  	cameraR.layers.enable(2)
  	cameraR.viewport = new Vector4()

  	var cameraVR = new ArrayCamera([cameraL, cameraR])
  	cameraVR.layers.enable(1)
  	cameraVR.layers.enable(2)

  	//

  	this.enabled = false

  	this.getDevice = function () {
  		return device
  	}

  	this.setDevice = function (value) {
  		if (value !== undefined) device = value

  		gl.setCompatibleXRDevice(value)
  	}

  	//

  	this.setSession = function (value, options) {
  		session = value

  		if (session !== null) {
  			session.addEventListener('end', function () {
  				renderer.setFramebuffer(null)
  				animation.stop()
  			})

  			session.baseLayer = new XRWebGLLayer(session, gl)
  			session.requestFrameOfReference(options.frameOfReferenceType).then(function (value) {
  				frameOfRef = value

  				renderer.setFramebuffer(session.baseLayer.framebuffer)

  				animation.setContext(session)
  				animation.start()
  			})
  		}
  	}

  	function updateCamera (camera, parent) {
  		if (parent === null) {
  			camera.matrixWorld.copy(camera.matrix)
  		} else {
  			camera.matrixWorld.multiplyMatrices(parent.matrixWorld, camera.matrix)
  		}

  		camera.matrixWorldInverse.getInverse(camera.matrixWorld)
  	}

  	this.getCamera = function (camera) {
  		if (isPresenting()) {
  			var parent = camera.parent
  			var cameras = cameraVR.cameras

  			// apply camera.parent to cameraVR

  			updateCamera(cameraVR, parent)

  			for (var i = 0; i < cameras.length; i++) {
  				updateCamera(cameras[i], parent)
  			}

  			// update camera and its children

  			camera.matrixWorld.copy(cameraVR.matrixWorld)

  			var children = camera.children

  			for (var i = 0, l = children.length; i < l; i++) {
  				children[i].updateMatrixWorld(true)
  			}

  			return cameraVR
  		}

  		return camera
  	}

  	this.isPresenting = isPresenting

  	// Animation Loop

  	var onAnimationFrameCallback = null

  	function onAnimationFrame (time, frame) {
  		pose = frame.getDevicePose(frameOfRef)

  		var layer = session.baseLayer
  		var views = frame.views

  		for (var i = 0; i < views.length; i++) {
  			var view = views[i]
  			var viewport = layer.getViewport(view)
  			var viewMatrix = pose.getViewMatrix(view)

  			var camera = cameraVR.cameras[i]
  			camera.matrix.fromArray(viewMatrix).getInverse(camera.matrix)
  			camera.projectionMatrix.fromArray(view.projectionMatrix)
  			camera.viewport.set(viewport.x, viewport.y, viewport.width, viewport.height)

  			if (i === 0) {
  				cameraVR.matrix.copy(camera.matrix)

  				// HACK (mrdoob)
  				// https://github.com/w3c/webvr/issues/203

  				cameraVR.projectionMatrix.copy(camera.projectionMatrix)
  			}
  		}

  		if (onAnimationFrameCallback) onAnimationFrameCallback()
  	}

  	var animation = new WebGLAnimation()
  	animation.setAnimationLoop(onAnimationFrame)

  	this.setAnimationLoop = function (callback) {
  		onAnimationFrameCallback = callback
  	}

  	// DEPRECATED

  	this.getStandingMatrix = function () {
  		console.warn('THREE.WebXRManager: getStandingMatrix() is no longer needed.')
  		return new THREE.Matrix4()
  	}

  	this.submitFrame = function () {}
  }

  /**
   * @author supereggbert / http://www.paulbrunt.co.uk/
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   * @author szimek / https://github.com/szimek/
   * @author tschw
   */

  function WebGLRenderer (parameters) {
  	console.log('THREE.WebGLRenderer', REVISION)

  	parameters = parameters || {}

  	var _canvas = parameters.canvas !== undefined ? parameters.canvas : document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas')
  		var _context = parameters.context !== undefined ? parameters.context : null

  		var _alpha = parameters.alpha !== undefined ? parameters.alpha : false
  		var _depth = parameters.depth !== undefined ? parameters.depth : true
  		var _stencil = parameters.stencil !== undefined ? parameters.stencil : true
  		var _antialias = parameters.antialias !== undefined ? parameters.antialias : false
  		var _premultipliedAlpha = parameters.premultipliedAlpha !== undefined ? parameters.premultipliedAlpha : true
  		var _preserveDrawingBuffer = parameters.preserveDrawingBuffer !== undefined ? parameters.preserveDrawingBuffer : false
  		var _powerPreference = parameters.powerPreference !== undefined ? parameters.powerPreference : 'default'

  	var currentRenderList = null
  	var currentRenderState = null

  	// public properties

  	this.domElement = _canvas
  	this.context = null

  	// clearing

  	this.autoClear = true
  	this.autoClearColor = true
  	this.autoClearDepth = true
  	this.autoClearStencil = true

  	// scene graph

  	this.sortObjects = true

  	// user-defined clipping

  	this.clippingPlanes = []
  	this.localClippingEnabled = false

  	// physically based shading

  	this.gammaFactor = 2.0	// for backwards compatibility
  	this.gammaInput = false
  	this.gammaOutput = false

  	// physical lights

  	this.physicallyCorrectLights = false

  	// tone mapping

  	this.toneMapping = LinearToneMapping
  	this.toneMappingExposure = 1.0
  	this.toneMappingWhitePoint = 1.0

  	// morphs

  	this.maxMorphTargets = 8
  	this.maxMorphNormals = 4

  	// internal properties

  	var _this = this

  		var _isContextLost = false

  		// internal state cache

  		var _framebuffer = null

  		var _currentRenderTarget = null
  		var _currentFramebuffer = null
  		var _currentMaterialId = -1
  		var _currentGeometryProgram = ''

  		var _currentCamera = null
  		var _currentArrayCamera = null

  		var _currentViewport = new Vector4()
  		var _currentScissor = new Vector4()
  		var _currentScissorTest = null

  		//

  		var _usedTextureUnits = 0

  		//

  		var _width = _canvas.width
  		var _height = _canvas.height

  		var _pixelRatio = 1

  		var _viewport = new Vector4(0, 0, _width, _height)
  		var _scissor = new Vector4(0, 0, _width, _height)
  		var _scissorTest = false

  		// frustum

  		var _frustum = new Frustum()

  		// clipping

  		var _clipping = new WebGLClipping()
  		var _clippingEnabled = false
  		var _localClippingEnabled = false

  		// camera matrices cache

  		var _projScreenMatrix = new Matrix4()

  		var _vector3 = new Vector3()

  	function getTargetPixelRatio () {
  		return _currentRenderTarget === null ? _pixelRatio : 1
  	}

  	// initialize

  	var _gl

  	try {
  		var contextAttributes = {
  			alpha: _alpha,
  			depth: _depth,
  			stencil: _stencil,
  			antialias: _antialias,
  			premultipliedAlpha: _premultipliedAlpha,
  			preserveDrawingBuffer: _preserveDrawingBuffer,
  			powerPreference: _powerPreference
  		}

  		// event listeners must be registered before WebGL context is created, see #12753

  		_canvas.addEventListener('webglcontextlost', onContextLost, false)
  		_canvas.addEventListener('webglcontextrestored', onContextRestore, false)

  		_gl = _context || _canvas.getContext('webgl', contextAttributes) || _canvas.getContext('experimental-webgl', contextAttributes)

  		if (_gl === null) {
  			if (_canvas.getContext('webgl') !== null) {
  				throw new Error('Error creating WebGL context with your selected attributes.')
  			} else {
  				throw new Error('Error creating WebGL context.')
  			}
  		}

  		// Some experimental-webgl implementations do not have getShaderPrecisionFormat

  		if (_gl.getShaderPrecisionFormat === undefined) {
  			_gl.getShaderPrecisionFormat = function () {
  				return { rangeMin: 1, rangeMax: 1, precision: 1 }
  			}
  		}
  	} catch (error) {
  		console.error('THREE.WebGLRenderer: ' + error.message)
  	}

  	var extensions, capabilities, state, info
  	var properties, textures, attributes, geometries, objects
  	var programCache, renderLists, renderStates

  	var background, morphtargets, bufferRenderer, indexedBufferRenderer
  	var spriteRenderer

  	var utils

  	function initGLContext () {
  		extensions = new WebGLExtensions(_gl)
  		extensions.get('WEBGL_depth_texture')
  		extensions.get('OES_texture_float')
  		extensions.get('OES_texture_float_linear')
  		extensions.get('OES_texture_half_float')
  		extensions.get('OES_texture_half_float_linear')
  		extensions.get('OES_standard_derivatives')
  		extensions.get('OES_element_index_uint')
  		extensions.get('ANGLE_instanced_arrays')

  		utils = new WebGLUtils(_gl, extensions)

  		capabilities = new WebGLCapabilities(_gl, extensions, parameters)

  		state = new WebGLState(_gl, extensions, utils)
  		state.scissor(_currentScissor.copy(_scissor).multiplyScalar(_pixelRatio))
  		state.viewport(_currentViewport.copy(_viewport).multiplyScalar(_pixelRatio))

  		info = new WebGLInfo(_gl)
  		properties = new WebGLProperties()
  		textures = new WebGLTextures(_gl, extensions, state, properties, capabilities, utils, info)
  		attributes = new WebGLAttributes(_gl)
  		geometries = new WebGLGeometries(_gl, attributes, info)
  		objects = new WebGLObjects(geometries, info)
  		morphtargets = new WebGLMorphtargets(_gl)
  		programCache = new WebGLPrograms(_this, extensions, capabilities)
  		renderLists = new WebGLRenderLists()
  		renderStates = new WebGLRenderStates()

  		background = new WebGLBackground(_this, state, objects, _premultipliedAlpha)

  		bufferRenderer = new WebGLBufferRenderer(_gl, extensions, info)
  		indexedBufferRenderer = new WebGLIndexedBufferRenderer(_gl, extensions, info)

  		spriteRenderer = new WebGLSpriteRenderer(_this, _gl, state, textures, capabilities)

  		info.programs = programCache.programs

  		_this.context = _gl
  		_this.capabilities = capabilities
  		_this.extensions = extensions
  		_this.properties = properties
  		_this.renderLists = renderLists
  		_this.state = state
  		_this.info = info
  	}

  	initGLContext()

  	// vr

  	var vr = ('xr' in navigator) ? new WebXRManager(_this) : new WebVRManager(_this)

  	this.vr = vr

  	// shadow map

  	var shadowMap = new WebGLShadowMap(_this, objects, capabilities.maxTextureSize)

  	this.shadowMap = shadowMap

  	// API

  	this.getContext = function () {
  		return _gl
  	}

  	this.getContextAttributes = function () {
  		return _gl.getContextAttributes()
  	}

  	this.forceContextLoss = function () {
  		var extension = extensions.get('WEBGL_lose_context')
  		if (extension) extension.loseContext()
  	}

  	this.forceContextRestore = function () {
  		var extension = extensions.get('WEBGL_lose_context')
  		if (extension) extension.restoreContext()
  	}

  	this.getPixelRatio = function () {
  		return _pixelRatio
  	}

  	this.setPixelRatio = function (value) {
  		if (value === undefined) return

  		_pixelRatio = value

  		this.setSize(_width, _height, false)
  	}

  	this.getSize = function () {
  		return {
  			width: _width,
  			height: _height
  		}
  	}

  	this.setSize = function (width, height, updateStyle) {
  		if (vr.isPresenting()) {
  			console.warn('THREE.WebGLRenderer: Can\'t change size while VR device is presenting.')
  			return
  		}

  		_width = width
  		_height = height

  		_canvas.width = width * _pixelRatio
  		_canvas.height = height * _pixelRatio

  		if (updateStyle !== false) {
  			_canvas.style.width = width + 'px'
  			_canvas.style.height = height + 'px'
  		}

  		this.setViewport(0, 0, width, height)
  	}

  	this.getDrawingBufferSize = function () {
  		return {
  			width: _width * _pixelRatio,
  			height: _height * _pixelRatio
  		}
  	}

  	this.setDrawingBufferSize = function (width, height, pixelRatio) {
  		_width = width
  		_height = height

  		_pixelRatio = pixelRatio

  		_canvas.width = width * pixelRatio
  		_canvas.height = height * pixelRatio

  		this.setViewport(0, 0, width, height)
  	}

  	this.getCurrentViewport = function () {
  		return _currentViewport
  	}

  	this.setViewport = function (x, y, width, height) {
  		_viewport.set(x, _height - y - height, width, height)
  		state.viewport(_currentViewport.copy(_viewport).multiplyScalar(_pixelRatio))
  	}

  	this.setScissor = function (x, y, width, height) {
  		_scissor.set(x, _height - y - height, width, height)
  		state.scissor(_currentScissor.copy(_scissor).multiplyScalar(_pixelRatio))
  	}

  	this.setScissorTest = function (boolean) {
  		state.setScissorTest(_scissorTest = boolean)
  	}

  	// Clearing

  	this.getClearColor = function () {
  		return background.getClearColor()
  	}

  	this.setClearColor = function () {
  		background.setClearColor.apply(background, arguments)
  	}

  	this.getClearAlpha = function () {
  		return background.getClearAlpha()
  	}

  	this.setClearAlpha = function () {
  		background.setClearAlpha.apply(background, arguments)
  	}

  	this.clear = function (color, depth, stencil) {
  		var bits = 0

  		if (color === undefined || color) bits |= _gl.COLOR_BUFFER_BIT
  		if (depth === undefined || depth) bits |= _gl.DEPTH_BUFFER_BIT
  		if (stencil === undefined || stencil) bits |= _gl.STENCIL_BUFFER_BIT

  		_gl.clear(bits)
  	}

  	this.clearColor = function () {
  		this.clear(true, false, false)
  	}

  	this.clearDepth = function () {
  		this.clear(false, true, false)
  	}

  	this.clearStencil = function () {
  		this.clear(false, false, true)
  	}

  	this.clearTarget = function (renderTarget, color, depth, stencil) {
  		this.setRenderTarget(renderTarget)
  		this.clear(color, depth, stencil)
  	}

  	//

  	this.dispose = function () {
  		_canvas.removeEventListener('webglcontextlost', onContextLost, false)
  		_canvas.removeEventListener('webglcontextrestored', onContextRestore, false)

  		renderLists.dispose()
  		renderStates.dispose()
  		properties.dispose()
  		objects.dispose()

  		vr.dispose()

  		animation.stop()
  	}

  	// Events

  	function onContextLost (event) {
  		event.preventDefault()

  		console.log('THREE.WebGLRenderer: Context Lost.')

  		_isContextLost = true
  	}

  	function onContextRestore (/* event */) {
  		console.log('THREE.WebGLRenderer: Context Restored.')

  		_isContextLost = false

  		initGLContext()
  	}

  	function onMaterialDispose (event) {
  		var material = event.target

  		material.removeEventListener('dispose', onMaterialDispose)

  		deallocateMaterial(material)
  	}

  	// Buffer deallocation

  	function deallocateMaterial (material) {
  		releaseMaterialProgramReference(material)

  		properties.remove(material)
  	}

  	function releaseMaterialProgramReference (material) {
  		var programInfo = properties.get(material).program

  		material.program = undefined

  		if (programInfo !== undefined) {
  			programCache.releaseProgram(programInfo)
  		}
  	}

  	// Buffer rendering

  	function renderObjectImmediate (object, program, material) {
  		object.render(function (object) {
  			_this.renderBufferImmediate(object, program, material)
  		})
  	}

  	this.renderBufferImmediate = function (object, program, material) {
  		state.initAttributes()

  		var buffers = properties.get(object)

  		if (object.hasPositions && !buffers.position) buffers.position = _gl.createBuffer()
  		if (object.hasNormals && !buffers.normal) buffers.normal = _gl.createBuffer()
  		if (object.hasUvs && !buffers.uv) buffers.uv = _gl.createBuffer()
  		if (object.hasColors && !buffers.color) buffers.color = _gl.createBuffer()

  		var programAttributes = program.getAttributes()

  		if (object.hasPositions) {
  			_gl.bindBuffer(_gl.ARRAY_BUFFER, buffers.position)
  			_gl.bufferData(_gl.ARRAY_BUFFER, object.positionArray, _gl.DYNAMIC_DRAW)

  			state.enableAttribute(programAttributes.position)
  			_gl.vertexAttribPointer(programAttributes.position, 3, _gl.FLOAT, false, 0, 0)
  		}

  		if (object.hasNormals) {
  			_gl.bindBuffer(_gl.ARRAY_BUFFER, buffers.normal)

  			if (!material.isMeshPhongMaterial &&
  				!material.isMeshStandardMaterial &&
  				!material.isMeshNormalMaterial &&
  				material.flatShading === true) {
  				for (var i = 0, l = object.count * 3; i < l; i += 9) {
  					var array = object.normalArray

  					var nx = (array[i + 0] + array[i + 3] + array[i + 6]) / 3
  					var ny = (array[i + 1] + array[i + 4] + array[i + 7]) / 3
  					var nz = (array[i + 2] + array[i + 5] + array[i + 8]) / 3

  					array[i + 0] = nx
  					array[i + 1] = ny
  					array[i + 2] = nz

  					array[i + 3] = nx
  					array[i + 4] = ny
  					array[i + 5] = nz

  					array[i + 6] = nx
  					array[i + 7] = ny
  					array[i + 8] = nz
  				}
  			}

  			_gl.bufferData(_gl.ARRAY_BUFFER, object.normalArray, _gl.DYNAMIC_DRAW)

  			state.enableAttribute(programAttributes.normal)

  			_gl.vertexAttribPointer(programAttributes.normal, 3, _gl.FLOAT, false, 0, 0)
  		}

  		if (object.hasUvs && material.map) {
  			_gl.bindBuffer(_gl.ARRAY_BUFFER, buffers.uv)
  			_gl.bufferData(_gl.ARRAY_BUFFER, object.uvArray, _gl.DYNAMIC_DRAW)

  			state.enableAttribute(programAttributes.uv)

  			_gl.vertexAttribPointer(programAttributes.uv, 2, _gl.FLOAT, false, 0, 0)
  		}

  		if (object.hasColors && material.vertexColors !== NoColors) {
  			_gl.bindBuffer(_gl.ARRAY_BUFFER, buffers.color)
  			_gl.bufferData(_gl.ARRAY_BUFFER, object.colorArray, _gl.DYNAMIC_DRAW)

  			state.enableAttribute(programAttributes.color)

  			_gl.vertexAttribPointer(programAttributes.color, 3, _gl.FLOAT, false, 0, 0)
  		}

  		state.disableUnusedAttributes()

  		_gl.drawArrays(_gl.TRIANGLES, 0, object.count)

  		object.count = 0
  	}

  	this.renderBufferDirect = function (camera, fog, geometry, material, object, group) {
  		var frontFaceCW = (object.isMesh && object.matrixWorld.determinant() < 0)

  		state.setMaterial(material, frontFaceCW)

  		var program = setProgram(camera, fog, material, object)
  		var geometryProgram = geometry.id + '_' + program.id + '_' + (material.wireframe === true)

  		var updateBuffers = false

  		if (geometryProgram !== _currentGeometryProgram) {
  			_currentGeometryProgram = geometryProgram
  			updateBuffers = true
  		}

  		if (object.morphTargetInfluences) {
  			morphtargets.update(object, geometry, material, program)

  			updateBuffers = true
  		}

  		//

  		var index = geometry.index
  		var position = geometry.attributes.position
  		var rangeFactor = 1

  		if (material.wireframe === true) {
  			index = geometries.getWireframeAttribute(geometry)
  			rangeFactor = 2
  		}

  		var attribute
  		var renderer = bufferRenderer

  		if (index !== null) {
  			attribute = attributes.get(index)

  			renderer = indexedBufferRenderer
  			renderer.setIndex(attribute)
  		}

  		if (updateBuffers) {
  			setupVertexAttributes(material, program, geometry)

  			if (index !== null) {
  				_gl.bindBuffer(_gl.ELEMENT_ARRAY_BUFFER, attribute.buffer)
  			}
  		}

  		//

  		var dataCount = Infinity

  		if (index !== null) {
  			dataCount = index.count
  		} else if (position !== undefined) {
  			dataCount = position.count
  		}

  		var rangeStart = geometry.drawRange.start * rangeFactor
  		var rangeCount = geometry.drawRange.count * rangeFactor

  		var groupStart = group !== null ? group.start * rangeFactor : 0
  		var groupCount = group !== null ? group.count * rangeFactor : Infinity

  		var drawStart = Math.max(rangeStart, groupStart)
  		var drawEnd = Math.min(dataCount, rangeStart + rangeCount, groupStart + groupCount) - 1

  		var drawCount = Math.max(0, drawEnd - drawStart + 1)

  		if (drawCount === 0) return

  		//

  		if (object.isMesh) {
  			if (material.wireframe === true) {
  				state.setLineWidth(material.wireframeLinewidth * getTargetPixelRatio())
  				renderer.setMode(_gl.LINES)
  			} else {
  				switch (object.drawMode) {
  					case TrianglesDrawMode:
  						renderer.setMode(_gl.TRIANGLES)
  						break

  					case TriangleStripDrawMode:
  						renderer.setMode(_gl.TRIANGLE_STRIP)
  						break

  					case TriangleFanDrawMode:
  						renderer.setMode(_gl.TRIANGLE_FAN)
  						break
  				}
  			}
  		} else if (object.isLine) {
  			var lineWidth = material.linewidth

  			if (lineWidth === undefined) lineWidth = 1 // Not using Line*Material

  			state.setLineWidth(lineWidth * getTargetPixelRatio())

  			if (object.isLineSegments) {
  				renderer.setMode(_gl.LINES)
  			} else if (object.isLineLoop) {
  				renderer.setMode(_gl.LINE_LOOP)
  			} else {
  				renderer.setMode(_gl.LINE_STRIP)
  			}
  		} else if (object.isPoints) {
  			renderer.setMode(_gl.POINTS)
  		}

  		if (geometry && geometry.isInstancedBufferGeometry) {
  			if (geometry.maxInstancedCount > 0) {
  				renderer.renderInstances(geometry, drawStart, drawCount)
  			}
  		} else {
  			renderer.render(drawStart, drawCount)
  		}
  	}

  	function setupVertexAttributes (material, program, geometry) {
  		if (geometry && geometry.isInstancedBufferGeometry) {
  			if (extensions.get('ANGLE_instanced_arrays') === null) {
  				console.error('THREE.WebGLRenderer.setupVertexAttributes: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.')
  				return
  			}
  		}

  		state.initAttributes()

  		var geometryAttributes = geometry.attributes

  		var programAttributes = program.getAttributes()

  		var materialDefaultAttributeValues = material.defaultAttributeValues

  		for (var name in programAttributes) {
  			var programAttribute = programAttributes[name]

  			if (programAttribute >= 0) {
  				var geometryAttribute = geometryAttributes[name]

  				if (geometryAttribute !== undefined) {
  					var normalized = geometryAttribute.normalized
  					var size = geometryAttribute.itemSize

  					var attribute = attributes.get(geometryAttribute)

  					// TODO Attribute may not be available on context restore

  					if (attribute === undefined) continue

  					var buffer = attribute.buffer
  					var type = attribute.type
  					var bytesPerElement = attribute.bytesPerElement

  					if (geometryAttribute.isInterleavedBufferAttribute) {
  						var data = geometryAttribute.data
  						var stride = data.stride
  						var offset = geometryAttribute.offset

  						if (data && data.isInstancedInterleavedBuffer) {
  							state.enableAttributeAndDivisor(programAttribute, data.meshPerAttribute)

  							if (geometry.maxInstancedCount === undefined) {
  								geometry.maxInstancedCount = data.meshPerAttribute * data.count
  							}
  						} else {
  							state.enableAttribute(programAttribute)
  						}

  						_gl.bindBuffer(_gl.ARRAY_BUFFER, buffer)
  						_gl.vertexAttribPointer(programAttribute, size, type, normalized, stride * bytesPerElement, offset * bytesPerElement)
  					} else {
  						if (geometryAttribute.isInstancedBufferAttribute) {
  							state.enableAttributeAndDivisor(programAttribute, geometryAttribute.meshPerAttribute)

  							if (geometry.maxInstancedCount === undefined) {
  								geometry.maxInstancedCount = geometryAttribute.meshPerAttribute * geometryAttribute.count
  							}
  						} else {
  							state.enableAttribute(programAttribute)
  						}

  						_gl.bindBuffer(_gl.ARRAY_BUFFER, buffer)
  						_gl.vertexAttribPointer(programAttribute, size, type, normalized, 0, 0)
  					}
  				} else if (materialDefaultAttributeValues !== undefined) {
  					var value = materialDefaultAttributeValues[name]

  					if (value !== undefined) {
  						switch (value.length) {
  							case 2:
  								_gl.vertexAttrib2fv(programAttribute, value)
  								break

  							case 3:
  								_gl.vertexAttrib3fv(programAttribute, value)
  								break

  							case 4:
  								_gl.vertexAttrib4fv(programAttribute, value)
  								break

  							default:
  								_gl.vertexAttrib1fv(programAttribute, value)
  						}
  					}
  				}
  			}
  		}

  		state.disableUnusedAttributes()
  	}

  	// Compile

  	this.compile = function (scene, camera) {
  		currentRenderState = renderStates.get(scene, camera)
  		currentRenderState.init()

  		scene.traverse(function (object) {
  			if (object.isLight) {
  				currentRenderState.pushLight(object)

  				if (object.castShadow) {
  					currentRenderState.pushShadow(object)
  				}
  			}
  		})

  		currentRenderState.setupLights(camera)

  		scene.traverse(function (object) {
  			if (object.material) {
  				if (Array.isArray(object.material)) {
  					for (var i = 0; i < object.material.length; i++) {
  						initMaterial(object.material[i], scene.fog, object)
  					}
  				} else {
  					initMaterial(object.material, scene.fog, object)
  				}
  			}
  		})
  	}

  	// Animation Loop

  	var onAnimationFrameCallback = null

  	function onAnimationFrame () {
  		if (vr.isPresenting()) return
  		if (onAnimationFrameCallback) onAnimationFrameCallback()
  	}

  	var animation = new WebGLAnimation()
  	animation.setAnimationLoop(onAnimationFrame)
  	animation.setContext(window)

  	this.setAnimationLoop = function (callback) {
  		onAnimationFrameCallback = callback
  		vr.setAnimationLoop(callback)

  		animation.start()
  	}

  	// Rendering

  	this.render = function (scene, camera, renderTarget, forceClear) {
  		if (!(camera && camera.isCamera)) {
  			console.error('THREE.WebGLRenderer.render: camera is not an instance of THREE.Camera.')
  			return
  		}

  		if (_isContextLost) return

  		// reset caching for this frame

  		_currentGeometryProgram = ''
  		_currentMaterialId = -1
  		_currentCamera = null

  		// update scene graph

  		if (scene.autoUpdate === true) scene.updateMatrixWorld()

  		// update camera matrices and frustum

  		if (camera.parent === null) camera.updateMatrixWorld()

  		if (vr.enabled) {
  			camera = vr.getCamera(camera)
  		}

  		//

  		currentRenderState = renderStates.get(scene, camera)
  		currentRenderState.init()

  		scene.onBeforeRender(_this, scene, camera, renderTarget)

  		_projScreenMatrix.multiplyMatrices(camera.projectionMatrix, camera.matrixWorldInverse)
  		_frustum.setFromMatrix(_projScreenMatrix)

  		_localClippingEnabled = this.localClippingEnabled
  		_clippingEnabled = _clipping.init(this.clippingPlanes, _localClippingEnabled, camera)

  		currentRenderList = renderLists.get(scene, camera)
  		currentRenderList.init()

  		projectObject(scene, camera, _this.sortObjects)

  		if (_this.sortObjects === true) {
  			currentRenderList.sort()
  		}

  		//

  		if (_clippingEnabled) _clipping.beginShadows()

  		var shadowsArray = currentRenderState.state.shadowsArray

  		shadowMap.render(shadowsArray, scene, camera)

  		currentRenderState.setupLights(camera)

  		if (_clippingEnabled) _clipping.endShadows()

  		//

  		if (this.info.autoReset) this.info.reset()

  		if (renderTarget === undefined) {
  			renderTarget = null
  		}

  		this.setRenderTarget(renderTarget)

  		//

  		background.render(currentRenderList, scene, camera, forceClear)

  		// render scene

  		var opaqueObjects = currentRenderList.opaque
  		var transparentObjects = currentRenderList.transparent

  		if (scene.overrideMaterial) {
  			var overrideMaterial = scene.overrideMaterial

  			if (opaqueObjects.length) renderObjects(opaqueObjects, scene, camera, overrideMaterial)
  			if (transparentObjects.length) renderObjects(transparentObjects, scene, camera, overrideMaterial)
  		} else {
  			// opaque pass (front-to-back order)

  			if (opaqueObjects.length) renderObjects(opaqueObjects, scene, camera)

  			// transparent pass (back-to-front order)

  			if (transparentObjects.length) renderObjects(transparentObjects, scene, camera)
  		}

  		// custom renderers

  		var spritesArray = currentRenderState.state.spritesArray

  		spriteRenderer.render(spritesArray, scene, camera)

  		// Generate mipmap if we're using any kind of mipmap filtering

  		if (renderTarget) {
  			textures.updateRenderTargetMipmap(renderTarget)
  		}

  		// Ensure depth buffer writing is enabled so it can be cleared on next render

  		state.buffers.depth.setTest(true)
  		state.buffers.depth.setMask(true)
  		state.buffers.color.setMask(true)

  		state.setPolygonOffset(false)

  		scene.onAfterRender(_this, scene, camera)

  		if (vr.enabled) {
  			vr.submitFrame()
  		}

  		// _gl.finish();

  		currentRenderList = null
  		currentRenderState = null
  	}

  	/*
  	// TODO Duplicated code (Frustum)

  	var _sphere = new Sphere();

  	function isObjectViewable( object ) {

  		var geometry = object.geometry;

  		if ( geometry.boundingSphere === null )
  			geometry.computeBoundingSphere();

  		_sphere.copy( geometry.boundingSphere ).
  		applyMatrix4( object.matrixWorld );

  		return isSphereViewable( _sphere );

  	}

  	function isSpriteViewable( sprite ) {

  		_sphere.center.set( 0, 0, 0 );
  		_sphere.radius = 0.7071067811865476;
  		_sphere.applyMatrix4( sprite.matrixWorld );

  		return isSphereViewable( _sphere );

  	}

  	function isSphereViewable( sphere ) {

  		if ( ! _frustum.intersectsSphere( sphere ) ) return false;

  		var numPlanes = _clipping.numPlanes;

  		if ( numPlanes === 0 ) return true;

  		var planes = _this.clippingPlanes,

  			center = sphere.center,
  			negRad = - sphere.radius,
  			i = 0;

  		do {

  			// out when deeper than radius in the negative halfspace
  			if ( planes[ i ].distanceToPoint( center ) < negRad ) return false;

  		} while ( ++ i !== numPlanes );

  		return true;

  	}
  	*/

  	function projectObject (object, camera, sortObjects) {
  		if (object.visible === false) return

  		var visible = object.layers.test(camera.layers)

  		if (visible) {
  			if (object.isLight) {
  				currentRenderState.pushLight(object)

  				if (object.castShadow) {
  					currentRenderState.pushShadow(object)
  				}
  			} else if (object.isSprite) {
  				if (!object.frustumCulled || _frustum.intersectsSprite(object)) {
  					currentRenderState.pushSprite(object)
  				}
  			} else if (object.isImmediateRenderObject) {
  				if (sortObjects) {
  					_vector3.setFromMatrixPosition(object.matrixWorld)
  						.applyMatrix4(_projScreenMatrix)
  				}

  				currentRenderList.push(object, null, object.material, _vector3.z, null)
  			} else if (object.isMesh || object.isLine || object.isPoints) {
  				if (object.isSkinnedMesh) {
  					object.skeleton.update()
  				}

  				if (!object.frustumCulled || _frustum.intersectsObject(object)) {
  					if (sortObjects) {
  						_vector3.setFromMatrixPosition(object.matrixWorld)
  							.applyMatrix4(_projScreenMatrix)
  					}

  					var geometry = objects.update(object)
  					var material = object.material

  					if (Array.isArray(material)) {
  						var groups = geometry.groups

  						for (var i = 0, l = groups.length; i < l; i++) {
  							var group = groups[i]
  							var groupMaterial = material[group.materialIndex]

  							if (groupMaterial && groupMaterial.visible) {
  								currentRenderList.push(object, geometry, groupMaterial, _vector3.z, group)
  							}
  						}
  					} else if (material.visible) {
  						currentRenderList.push(object, geometry, material, _vector3.z, null)
  					}
  				}
  			}
  		}

  		var children = object.children

  		for (var i = 0, l = children.length; i < l; i++) {
  			projectObject(children[i], camera, sortObjects)
  		}
  	}

  	function renderObjects (renderList, scene, camera, overrideMaterial) {
  		for (var i = 0, l = renderList.length; i < l; i++) {
  			var renderItem = renderList[i]

  			var object = renderItem.object
  			var geometry = renderItem.geometry
  			var material = overrideMaterial === undefined ? renderItem.material : overrideMaterial
  			var group = renderItem.group

  			if (camera.isArrayCamera) {
  				_currentArrayCamera = camera

  				var cameras = camera.cameras

  				for (var j = 0, jl = cameras.length; j < jl; j++) {
  					var camera2 = cameras[j]

  					if (object.layers.test(camera2.layers)) {
  						if ('viewport' in camera2) { // XR
  							state.viewport(_currentViewport.copy(camera2.viewport))
  						} else {
  							var bounds = camera2.bounds

  							var x = bounds.x * _width
  							var y = bounds.y * _height
  							var width = bounds.z * _width
  							var height = bounds.w * _height

  							state.viewport(_currentViewport.set(x, y, width, height).multiplyScalar(_pixelRatio))
  						}

  						renderObject(object, scene, camera2, geometry, material, group)
  					}
  				}
  			} else {
  				_currentArrayCamera = null

  				renderObject(object, scene, camera, geometry, material, group)
  			}
  		}
  	}

  	function renderObject (object, scene, camera, geometry, material, group) {
  		object.onBeforeRender(_this, scene, camera, geometry, material, group)
  		currentRenderState = renderStates.get(scene, _currentArrayCamera || camera)

  		object.modelViewMatrix.multiplyMatrices(camera.matrixWorldInverse, object.matrixWorld)
  		object.normalMatrix.getNormalMatrix(object.modelViewMatrix)

  		if (object.isImmediateRenderObject) {
  			var frontFaceCW = (object.isMesh && object.matrixWorld.determinant() < 0)

  			state.setMaterial(material, frontFaceCW)

  			var program = setProgram(camera, scene.fog, material, object)

  			_currentGeometryProgram = ''

  			renderObjectImmediate(object, program, material)
  		} else {
  			_this.renderBufferDirect(camera, scene.fog, geometry, material, object, group)
  		}

  		object.onAfterRender(_this, scene, camera, geometry, material, group)
  		currentRenderState = renderStates.get(scene, _currentArrayCamera || camera)
  	}

  	function initMaterial (material, fog, object) {
  		var materialProperties = properties.get(material)

  		var lights = currentRenderState.state.lights
  		var shadowsArray = currentRenderState.state.shadowsArray

  		var parameters = programCache.getParameters(
  			material, lights.state, shadowsArray, fog, _clipping.numPlanes, _clipping.numIntersection, object)

  		var code = programCache.getProgramCode(material, parameters)

  		var program = materialProperties.program
  		var programChange = true

  		if (program === undefined) {
  			// new material
  			material.addEventListener('dispose', onMaterialDispose)
  		} else if (program.code !== code) {
  			// changed glsl or parameters
  			releaseMaterialProgramReference(material)
  		} else if (materialProperties.lightsHash !== lights.state.hash) {
  			properties.update(material, 'lightsHash', lights.state.hash)
  			programChange = false
  		} else if (parameters.shaderID !== undefined) {
  			// same glsl and uniform list
  			return
  		} else {
  			// only rebuild uniform list
  			programChange = false
  		}

  		if (programChange) {
  			if (parameters.shaderID) {
  				var shader = ShaderLib[parameters.shaderID]

  				materialProperties.shader = {
  					name: material.type,
  					uniforms: UniformsUtils.clone(shader.uniforms),
  					vertexShader: shader.vertexShader,
  					fragmentShader: shader.fragmentShader
  				}
  			} else {
  				materialProperties.shader = {
  					name: material.type,
  					uniforms: material.uniforms,
  					vertexShader: material.vertexShader,
  					fragmentShader: material.fragmentShader
  				}
  			}

  			material.onBeforeCompile(materialProperties.shader, _this)

  			program = programCache.acquireProgram(material, materialProperties.shader, parameters, code)

  			materialProperties.program = program
  			material.program = program
  		}

  		var programAttributes = program.getAttributes()

  		if (material.morphTargets) {
  			material.numSupportedMorphTargets = 0

  			for (var i = 0; i < _this.maxMorphTargets; i++) {
  				if (programAttributes['morphTarget' + i] >= 0) {
  					material.numSupportedMorphTargets++
  				}
  			}
  		}

  		if (material.morphNormals) {
  			material.numSupportedMorphNormals = 0

  			for (var i = 0; i < _this.maxMorphNormals; i++) {
  				if (programAttributes['morphNormal' + i] >= 0) {
  					material.numSupportedMorphNormals++
  				}
  			}
  		}

  		var uniforms = materialProperties.shader.uniforms

  		if (!material.isShaderMaterial &&
  			!material.isRawShaderMaterial ||
  			material.clipping === true) {
  			materialProperties.numClippingPlanes = _clipping.numPlanes
  			materialProperties.numIntersection = _clipping.numIntersection
  			uniforms.clippingPlanes = _clipping.uniform
  		}

  		materialProperties.fog = fog

  		// store the light setup it was created for

  		materialProperties.lightsHash = lights.state.hash

  		if (material.lights) {
  			// wire up the material to this renderer's lighting state

  			uniforms.ambientLightColor.value = lights.state.ambient
  			uniforms.directionalLights.value = lights.state.directional
  			uniforms.spotLights.value = lights.state.spot
  			uniforms.rectAreaLights.value = lights.state.rectArea
  			uniforms.pointLights.value = lights.state.point
  			uniforms.hemisphereLights.value = lights.state.hemi

  			uniforms.directionalShadowMap.value = lights.state.directionalShadowMap
  			uniforms.directionalShadowMatrix.value = lights.state.directionalShadowMatrix
  			uniforms.spotShadowMap.value = lights.state.spotShadowMap
  			uniforms.spotShadowMatrix.value = lights.state.spotShadowMatrix
  			uniforms.pointShadowMap.value = lights.state.pointShadowMap
  			uniforms.pointShadowMatrix.value = lights.state.pointShadowMatrix
  			// TODO (abelnation): add area lights shadow info to uniforms
  		}

  		var progUniforms = materialProperties.program.getUniforms()
  			var uniformsList =
  				WebGLUniforms.seqWithValue(progUniforms.seq, uniforms)

  		materialProperties.uniformsList = uniformsList
  	}

  	function setProgram (camera, fog, material, object) {
  		_usedTextureUnits = 0

  		var materialProperties = properties.get(material)
  		var lights = currentRenderState.state.lights

  		if (_clippingEnabled) {
  			if (_localClippingEnabled || camera !== _currentCamera) {
  				var useCache =
  					camera === _currentCamera &&
  					material.id === _currentMaterialId

  				// we might want to call this function with some ClippingGroup
  				// object instead of the material, once it becomes feasible
  				// (#8465, #8379)
  				_clipping.setState(
  					material.clippingPlanes, material.clipIntersection, material.clipShadows,
  					camera, materialProperties, useCache)
  			}
  		}

  		if (material.needsUpdate === false) {
  			if (materialProperties.program === undefined) {
  				material.needsUpdate = true
  			} else if (material.fog && materialProperties.fog !== fog) {
  				material.needsUpdate = true
  			} else if (material.lights && materialProperties.lightsHash !== lights.state.hash) {
  				material.needsUpdate = true
  			} else if (materialProperties.numClippingPlanes !== undefined &&
  				(materialProperties.numClippingPlanes !== _clipping.numPlanes ||
  				materialProperties.numIntersection !== _clipping.numIntersection)) {
  				material.needsUpdate = true
  			}
  		}

  		if (material.needsUpdate) {
  			initMaterial(material, fog, object)
  			material.needsUpdate = false
  		}

  		var refreshProgram = false
  		var refreshMaterial = false
  		var refreshLights = false

  		var program = materialProperties.program
  			var p_uniforms = program.getUniforms()
  			var m_uniforms = materialProperties.shader.uniforms

  		if (state.useProgram(program.program)) {
  			refreshProgram = true
  			refreshMaterial = true
  			refreshLights = true
  		}

  		if (material.id !== _currentMaterialId) {
  			_currentMaterialId = material.id

  			refreshMaterial = true
  		}

  		if (refreshProgram || camera !== _currentCamera) {
  			p_uniforms.setValue(_gl, 'projectionMatrix', camera.projectionMatrix)

  			if (capabilities.logarithmicDepthBuffer) {
  				p_uniforms.setValue(_gl, 'logDepthBufFC',
  					2.0 / (Math.log(camera.far + 1.0) / Math.LN2))
  			}

  			// Avoid unneeded uniform updates per ArrayCamera's sub-camera

  			if (_currentCamera !== (_currentArrayCamera || camera)) {
  				_currentCamera = (_currentArrayCamera || camera)

  				// lighting uniforms depend on the camera so enforce an update
  				// now, in case this material supports lights - or later, when
  				// the next material that does gets activated:

  				refreshMaterial = true		// set to true on material change
  				refreshLights = true		// remains set until update done
  			}

  			// load material specific uniforms
  			// (shader material also gets them for the sake of genericity)

  			if (material.isShaderMaterial ||
  				material.isMeshPhongMaterial ||
  				material.isMeshStandardMaterial ||
  				material.envMap) {
  				var uCamPos = p_uniforms.map.cameraPosition

  				if (uCamPos !== undefined) {
  					uCamPos.setValue(_gl,
  						_vector3.setFromMatrixPosition(camera.matrixWorld))
  				}
  			}

  			if (material.isMeshPhongMaterial ||
  				material.isMeshLambertMaterial ||
  				material.isMeshBasicMaterial ||
  				material.isMeshStandardMaterial ||
  				material.isShaderMaterial ||
  				material.skinning) {
  				p_uniforms.setValue(_gl, 'viewMatrix', camera.matrixWorldInverse)
  			}
  		}

  		// skinning uniforms must be set even if material didn't change
  		// auto-setting of texture unit for bone texture must go before other textures
  		// not sure why, but otherwise weird things happen

  		if (material.skinning) {
  			p_uniforms.setOptional(_gl, object, 'bindMatrix')
  			p_uniforms.setOptional(_gl, object, 'bindMatrixInverse')

  			var skeleton = object.skeleton

  			if (skeleton) {
  				var bones = skeleton.bones

  				if (capabilities.floatVertexTextures) {
  					if (skeleton.boneTexture === undefined) {
  						// layout (1 matrix = 4 pixels)
  						//      RGBA RGBA RGBA RGBA (=> column1, column2, column3, column4)
  						//  with  8x8  pixel texture max   16 bones * 4 pixels =  (8 * 8)
  						//       16x16 pixel texture max   64 bones * 4 pixels = (16 * 16)
  						//       32x32 pixel texture max  256 bones * 4 pixels = (32 * 32)
  						//       64x64 pixel texture max 1024 bones * 4 pixels = (64 * 64)

  						var size = Math.sqrt(bones.length * 4) // 4 pixels needed for 1 matrix
  						size = _Math.ceilPowerOfTwo(size)
  						size = Math.max(size, 4)

  						var boneMatrices = new Float32Array(size * size * 4) // 4 floats per RGBA pixel
  						boneMatrices.set(skeleton.boneMatrices) // copy current values

  						var boneTexture = new DataTexture(boneMatrices, size, size, RGBAFormat, FloatType)
  						boneTexture.needsUpdate = true

  						skeleton.boneMatrices = boneMatrices
  						skeleton.boneTexture = boneTexture
  						skeleton.boneTextureSize = size
  					}

  					p_uniforms.setValue(_gl, 'boneTexture', skeleton.boneTexture)
  					p_uniforms.setValue(_gl, 'boneTextureSize', skeleton.boneTextureSize)
  				} else {
  					p_uniforms.setOptional(_gl, skeleton, 'boneMatrices')
  				}
  			}
  		}

  		if (refreshMaterial) {
  			p_uniforms.setValue(_gl, 'toneMappingExposure', _this.toneMappingExposure)
  			p_uniforms.setValue(_gl, 'toneMappingWhitePoint', _this.toneMappingWhitePoint)

  			if (material.lights) {
  				// the current material requires lighting info

  				// note: all lighting uniforms are always set correctly
  				// they simply reference the renderer's state for their
  				// values
  				//
  				// use the current material's .needsUpdate flags to set
  				// the GL state when required

  				markUniformsLightsNeedsUpdate(m_uniforms, refreshLights)
  			}

  			// refresh uniforms common to several materials

  			if (fog && material.fog) {
  				refreshUniformsFog(m_uniforms, fog)
  			}

  			if (material.isMeshBasicMaterial) {
  				refreshUniformsCommon(m_uniforms, material)
  			} else if (material.isMeshLambertMaterial) {
  				refreshUniformsCommon(m_uniforms, material)
  				refreshUniformsLambert(m_uniforms, material)
  			} else if (material.isMeshPhongMaterial) {
  				refreshUniformsCommon(m_uniforms, material)

  				if (material.isMeshToonMaterial) {
  					refreshUniformsToon(m_uniforms, material)
  				} else {
  					refreshUniformsPhong(m_uniforms, material)
  				}
  			} else if (material.isMeshStandardMaterial) {
  				refreshUniformsCommon(m_uniforms, material)

  				if (material.isMeshPhysicalMaterial) {
  					refreshUniformsPhysical(m_uniforms, material)
  				} else {
  					refreshUniformsStandard(m_uniforms, material)
  				}
  			} else if (material.isMeshDepthMaterial) {
  				refreshUniformsCommon(m_uniforms, material)
  				refreshUniformsDepth(m_uniforms, material)
  			} else if (material.isMeshDistanceMaterial) {
  				refreshUniformsCommon(m_uniforms, material)
  				refreshUniformsDistance(m_uniforms, material)
  			} else if (material.isMeshNormalMaterial) {
  				refreshUniformsCommon(m_uniforms, material)
  				refreshUniformsNormal(m_uniforms, material)
  			} else if (material.isLineBasicMaterial) {
  				refreshUniformsLine(m_uniforms, material)

  				if (material.isLineDashedMaterial) {
  					refreshUniformsDash(m_uniforms, material)
  				}
  			} else if (material.isPointsMaterial) {
  				refreshUniformsPoints(m_uniforms, material)
  			} else if (material.isShadowMaterial) {
  				m_uniforms.color.value = material.color
  				m_uniforms.opacity.value = material.opacity
  			}

  			// RectAreaLight Texture
  			// TODO (mrdoob): Find a nicer implementation

  			if (m_uniforms.ltc_1 !== undefined) m_uniforms.ltc_1.value = UniformsLib.LTC_1
  			if (m_uniforms.ltc_2 !== undefined) m_uniforms.ltc_2.value = UniformsLib.LTC_2

  			WebGLUniforms.upload(_gl, materialProperties.uniformsList, m_uniforms, _this)
  		}

  		if (material.isShaderMaterial && material.uniformsNeedUpdate === true) {
  			WebGLUniforms.upload(_gl, materialProperties.uniformsList, m_uniforms, _this)
  			material.uniformsNeedUpdate = false
  		}

  		// common matrices

  		p_uniforms.setValue(_gl, 'modelViewMatrix', object.modelViewMatrix)
  		p_uniforms.setValue(_gl, 'normalMatrix', object.normalMatrix)
  		p_uniforms.setValue(_gl, 'modelMatrix', object.matrixWorld)

  		return program
  	}

  	// Uniforms (refresh uniforms objects)

  	function refreshUniformsCommon (uniforms, material) {
  		uniforms.opacity.value = material.opacity

  		if (material.color) {
  			uniforms.diffuse.value = material.color
  		}

  		if (material.emissive) {
  			uniforms.emissive.value.copy(material.emissive).multiplyScalar(material.emissiveIntensity)
  		}

  		if (material.map) {
  			uniforms.map.value = material.map
  		}

  		if (material.alphaMap) {
  			uniforms.alphaMap.value = material.alphaMap
  		}

  		if (material.specularMap) {
  			uniforms.specularMap.value = material.specularMap
  		}

  		if (material.envMap) {
  			uniforms.envMap.value = material.envMap

  			// don't flip CubeTexture envMaps, flip everything else:
  			//  WebGLRenderTargetCube will be flipped for backwards compatibility
  			//  WebGLRenderTargetCube.texture will be flipped because it's a Texture and NOT a CubeTexture
  			// this check must be handled differently, or removed entirely, if WebGLRenderTargetCube uses a CubeTexture in the future
  			uniforms.flipEnvMap.value = (!(material.envMap && material.envMap.isCubeTexture)) ? 1 : -1

  			uniforms.reflectivity.value = material.reflectivity
  			uniforms.refractionRatio.value = material.refractionRatio

  			uniforms.maxMipLevel.value = properties.get(material.envMap).__maxMipLevel
  		}

  		if (material.lightMap) {
  			uniforms.lightMap.value = material.lightMap
  			uniforms.lightMapIntensity.value = material.lightMapIntensity
  		}

  		if (material.aoMap) {
  			uniforms.aoMap.value = material.aoMap
  			uniforms.aoMapIntensity.value = material.aoMapIntensity
  		}

  		// uv repeat and offset setting priorities
  		// 1. color map
  		// 2. specular map
  		// 3. normal map
  		// 4. bump map
  		// 5. alpha map
  		// 6. emissive map

  		var uvScaleMap

  		if (material.map) {
  			uvScaleMap = material.map
  		} else if (material.specularMap) {
  			uvScaleMap = material.specularMap
  		} else if (material.displacementMap) {
  			uvScaleMap = material.displacementMap
  		} else if (material.normalMap) {
  			uvScaleMap = material.normalMap
  		} else if (material.bumpMap) {
  			uvScaleMap = material.bumpMap
  		} else if (material.roughnessMap) {
  			uvScaleMap = material.roughnessMap
  		} else if (material.metalnessMap) {
  			uvScaleMap = material.metalnessMap
  		} else if (material.alphaMap) {
  			uvScaleMap = material.alphaMap
  		} else if (material.emissiveMap) {
  			uvScaleMap = material.emissiveMap
  		}

  		if (uvScaleMap !== undefined) {
  			// backwards compatibility
  			if (uvScaleMap.isWebGLRenderTarget) {
  				uvScaleMap = uvScaleMap.texture
  			}

  			if (uvScaleMap.matrixAutoUpdate === true) {
  				uvScaleMap.updateMatrix()
  			}

  			uniforms.uvTransform.value.copy(uvScaleMap.matrix)
  		}
  	}

  	function refreshUniformsLine (uniforms, material) {
  		uniforms.diffuse.value = material.color
  		uniforms.opacity.value = material.opacity
  	}

  	function refreshUniformsDash (uniforms, material) {
  		uniforms.dashSize.value = material.dashSize
  		uniforms.totalSize.value = material.dashSize + material.gapSize
  		uniforms.scale.value = material.scale
  	}

  	function refreshUniformsPoints (uniforms, material) {
  		uniforms.diffuse.value = material.color
  		uniforms.opacity.value = material.opacity
  		uniforms.size.value = material.size * _pixelRatio
  		uniforms.scale.value = _height * 0.5

  		uniforms.map.value = material.map

  		if (material.map !== null) {
  			if (material.map.matrixAutoUpdate === true) {
  				material.map.updateMatrix()
  			}

  			uniforms.uvTransform.value.copy(material.map.matrix)
  		}
  	}

  	function refreshUniformsFog (uniforms, fog) {
  		uniforms.fogColor.value = fog.color

  		if (fog.isFog) {
  			uniforms.fogNear.value = fog.near
  			uniforms.fogFar.value = fog.far
  		} else if (fog.isFogExp2) {
  			uniforms.fogDensity.value = fog.density
  		}
  	}

  	function refreshUniformsLambert (uniforms, material) {
  		if (material.emissiveMap) {
  			uniforms.emissiveMap.value = material.emissiveMap
  		}
  	}

  	function refreshUniformsPhong (uniforms, material) {
  		uniforms.specular.value = material.specular
  		uniforms.shininess.value = Math.max(material.shininess, 1e-4) // to prevent pow( 0.0, 0.0 )

  		if (material.emissiveMap) {
  			uniforms.emissiveMap.value = material.emissiveMap
  		}

  		if (material.bumpMap) {
  			uniforms.bumpMap.value = material.bumpMap
  			uniforms.bumpScale.value = material.bumpScale
  			if (material.side === BackSide) uniforms.bumpScale.value *= -1
  		}

  		if (material.normalMap) {
  			uniforms.normalMap.value = material.normalMap
  			uniforms.normalScale.value.copy(material.normalScale)
  			if (material.side === BackSide) uniforms.normalScale.value.negate()
  		}

  		if (material.displacementMap) {
  			uniforms.displacementMap.value = material.displacementMap
  			uniforms.displacementScale.value = material.displacementScale
  			uniforms.displacementBias.value = material.displacementBias
  		}
  	}

  	function refreshUniformsToon (uniforms, material) {
  		refreshUniformsPhong(uniforms, material)

  		if (material.gradientMap) {
  			uniforms.gradientMap.value = material.gradientMap
  		}
  	}

  	function refreshUniformsStandard (uniforms, material) {
  		uniforms.roughness.value = material.roughness
  		uniforms.metalness.value = material.metalness

  		if (material.roughnessMap) {
  			uniforms.roughnessMap.value = material.roughnessMap
  		}

  		if (material.metalnessMap) {
  			uniforms.metalnessMap.value = material.metalnessMap
  		}

  		if (material.emissiveMap) {
  			uniforms.emissiveMap.value = material.emissiveMap
  		}

  		if (material.bumpMap) {
  			uniforms.bumpMap.value = material.bumpMap
  			uniforms.bumpScale.value = material.bumpScale
  			if (material.side === BackSide) uniforms.bumpScale.value *= -1
  		}

  		if (material.normalMap) {
  			uniforms.normalMap.value = material.normalMap
  			uniforms.normalScale.value.copy(material.normalScale)
  			if (material.side === BackSide) uniforms.normalScale.value.negate()
  		}

  		if (material.displacementMap) {
  			uniforms.displacementMap.value = material.displacementMap
  			uniforms.displacementScale.value = material.displacementScale
  			uniforms.displacementBias.value = material.displacementBias
  		}

  		if (material.envMap) {
  			// uniforms.envMap.value = material.envMap; // part of uniforms common
  			uniforms.envMapIntensity.value = material.envMapIntensity
  		}
  	}

  	function refreshUniformsPhysical (uniforms, material) {
  		uniforms.clearCoat.value = material.clearCoat
  		uniforms.clearCoatRoughness.value = material.clearCoatRoughness

  		refreshUniformsStandard(uniforms, material)
  	}

  	function refreshUniformsDepth (uniforms, material) {
  		if (material.displacementMap) {
  			uniforms.displacementMap.value = material.displacementMap
  			uniforms.displacementScale.value = material.displacementScale
  			uniforms.displacementBias.value = material.displacementBias
  		}
  	}

  	function refreshUniformsDistance (uniforms, material) {
  		if (material.displacementMap) {
  			uniforms.displacementMap.value = material.displacementMap
  			uniforms.displacementScale.value = material.displacementScale
  			uniforms.displacementBias.value = material.displacementBias
  		}

  		uniforms.referencePosition.value.copy(material.referencePosition)
  		uniforms.nearDistance.value = material.nearDistance
  		uniforms.farDistance.value = material.farDistance
  	}

  	function refreshUniformsNormal (uniforms, material) {
  		if (material.bumpMap) {
  			uniforms.bumpMap.value = material.bumpMap
  			uniforms.bumpScale.value = material.bumpScale
  			if (material.side === BackSide) uniforms.bumpScale.value *= -1
  		}

  		if (material.normalMap) {
  			uniforms.normalMap.value = material.normalMap
  			uniforms.normalScale.value.copy(material.normalScale)
  			if (material.side === BackSide) uniforms.normalScale.value.negate()
  		}

  		if (material.displacementMap) {
  			uniforms.displacementMap.value = material.displacementMap
  			uniforms.displacementScale.value = material.displacementScale
  			uniforms.displacementBias.value = material.displacementBias
  		}
  	}

  	// If uniforms are marked as clean, they don't need to be loaded to the GPU.

  	function markUniformsLightsNeedsUpdate (uniforms, value) {
  		uniforms.ambientLightColor.needsUpdate = value

  		uniforms.directionalLights.needsUpdate = value
  		uniforms.pointLights.needsUpdate = value
  		uniforms.spotLights.needsUpdate = value
  		uniforms.rectAreaLights.needsUpdate = value
  		uniforms.hemisphereLights.needsUpdate = value
  	}

  	// Textures

  	function allocTextureUnit () {
  		var textureUnit = _usedTextureUnits

  		if (textureUnit >= capabilities.maxTextures) {
  			console.warn('THREE.WebGLRenderer: Trying to use ' + textureUnit + ' texture units while this GPU supports only ' + capabilities.maxTextures)
  		}

  		_usedTextureUnits += 1

  		return textureUnit
  	}

  	this.allocTextureUnit = allocTextureUnit

  	// this.setTexture2D = setTexture2D;
  	this.setTexture2D = (function () {
  		var warned = false

  		// backwards compatibility: peel texture.texture
  		return function setTexture2D (texture, slot) {
  			if (texture && texture.isWebGLRenderTarget) {
  				if (!warned) {
  					console.warn("THREE.WebGLRenderer.setTexture2D: don't use render targets as textures. Use their .texture property instead.")
  					warned = true
  				}

  				texture = texture.texture
  			}

  			textures.setTexture2D(texture, slot)
  		}
  	}())

  	this.setTexture = (function () {
  		var warned = false

  		return function setTexture (texture, slot) {
  			if (!warned) {
  				console.warn('THREE.WebGLRenderer: .setTexture is deprecated, use setTexture2D instead.')
  				warned = true
  			}

  			textures.setTexture2D(texture, slot)
  		}
  	}())

  	this.setTextureCube = (function () {
  		var warned = false

  		return function setTextureCube (texture, slot) {
  			// backwards compatibility: peel texture.texture
  			if (texture && texture.isWebGLRenderTargetCube) {
  				if (!warned) {
  					console.warn("THREE.WebGLRenderer.setTextureCube: don't use cube render targets as textures. Use their .texture property instead.")
  					warned = true
  				}

  				texture = texture.texture
  			}

  			// currently relying on the fact that WebGLRenderTargetCube.texture is a Texture and NOT a CubeTexture
  			// TODO: unify these code paths
  			if ((texture && texture.isCubeTexture) ||
  				(Array.isArray(texture.image) && texture.image.length === 6)) {
  				// CompressedTexture can have Array in image :/

  				// this function alone should take care of cube textures
  				textures.setTextureCube(texture, slot)
  			} else {
  				// assumed: texture property of THREE.WebGLRenderTargetCube

  				textures.setTextureCubeDynamic(texture, slot)
  			}
  		}
  	}())

  	//

  	this.setFramebuffer = function (value) {
  		_framebuffer = value
  	}

  	this.getRenderTarget = function () {
  		return _currentRenderTarget
  	}

  	this.setRenderTarget = function (renderTarget) {
  		_currentRenderTarget = renderTarget

  		if (renderTarget && properties.get(renderTarget).__webglFramebuffer === undefined) {
  			textures.setupRenderTarget(renderTarget)
  		}

  		var framebuffer = _framebuffer
  		var isCube = false

  		if (renderTarget) {
  			var __webglFramebuffer = properties.get(renderTarget).__webglFramebuffer

  			if (renderTarget.isWebGLRenderTargetCube) {
  				framebuffer = __webglFramebuffer[renderTarget.activeCubeFace]
  				isCube = true
  			} else {
  				framebuffer = __webglFramebuffer
  			}

  			_currentViewport.copy(renderTarget.viewport)
  			_currentScissor.copy(renderTarget.scissor)
  			_currentScissorTest = renderTarget.scissorTest
  		} else {
  			_currentViewport.copy(_viewport).multiplyScalar(_pixelRatio)
  			_currentScissor.copy(_scissor).multiplyScalar(_pixelRatio)
  			_currentScissorTest = _scissorTest
  		}

  		if (_currentFramebuffer !== framebuffer) {
  			_gl.bindFramebuffer(_gl.FRAMEBUFFER, framebuffer)
  			_currentFramebuffer = framebuffer
  		}

  		state.viewport(_currentViewport)
  		state.scissor(_currentScissor)
  		state.setScissorTest(_currentScissorTest)

  		if (isCube) {
  			var textureProperties = properties.get(renderTarget.texture)
  			_gl.framebufferTexture2D(_gl.FRAMEBUFFER, _gl.COLOR_ATTACHMENT0, _gl.TEXTURE_CUBE_MAP_POSITIVE_X + renderTarget.activeCubeFace, textureProperties.__webglTexture, renderTarget.activeMipMapLevel)
  		}
  	}

  	this.readRenderTargetPixels = function (renderTarget, x, y, width, height, buffer) {
  		if (!(renderTarget && renderTarget.isWebGLRenderTarget)) {
  			console.error('THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not THREE.WebGLRenderTarget.')
  			return
  		}

  		var framebuffer = properties.get(renderTarget).__webglFramebuffer

  		if (framebuffer) {
  			var restore = false

  			if (framebuffer !== _currentFramebuffer) {
  				_gl.bindFramebuffer(_gl.FRAMEBUFFER, framebuffer)

  				restore = true
  			}

  			try {
  				var texture = renderTarget.texture
  				var textureFormat = texture.format
  				var textureType = texture.type

  				if (textureFormat !== RGBAFormat && utils.convert(textureFormat) !== _gl.getParameter(_gl.IMPLEMENTATION_COLOR_READ_FORMAT)) {
  					console.error('THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in RGBA or implementation defined format.')
  					return
  				}

  				if (textureType !== UnsignedByteType && utils.convert(textureType) !== _gl.getParameter(_gl.IMPLEMENTATION_COLOR_READ_TYPE) && // IE11, Edge and Chrome Mac < 52 (#9513)
  					!(textureType === FloatType && (extensions.get('OES_texture_float') || extensions.get('WEBGL_color_buffer_float'))) && // Chrome Mac >= 52 and Firefox
  					!(textureType === HalfFloatType && extensions.get('EXT_color_buffer_half_float'))) {
  					console.error('THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in UnsignedByteType or implementation defined type.')
  					return
  				}

  				if (_gl.checkFramebufferStatus(_gl.FRAMEBUFFER) === _gl.FRAMEBUFFER_COMPLETE) {
  					// the following if statement ensures valid read requests (no out-of-bounds pixels, see #8604)

  					if ((x >= 0 && x <= (renderTarget.width - width)) && (y >= 0 && y <= (renderTarget.height - height))) {
  						_gl.readPixels(x, y, width, height, utils.convert(textureFormat), utils.convert(textureType), buffer)
  					}
  				} else {
  					console.error('THREE.WebGLRenderer.readRenderTargetPixels: readPixels from renderTarget failed. Framebuffer not complete.')
  				}
  			} finally {
  				if (restore) {
  					_gl.bindFramebuffer(_gl.FRAMEBUFFER, _currentFramebuffer)
  				}
  			}
  		}
  	}

  	this.copyFramebufferToTexture = function (position, texture, level) {
  		var width = texture.image.width
  		var height = texture.image.height
  		var glFormat = utils.convert(texture.format)

  		this.setTexture2D(texture, 0)

  		_gl.copyTexImage2D(_gl.TEXTURE_2D, level || 0, glFormat, position.x, position.y, width, height, 0)
  	}

  	this.copyTextureToTexture = function (position, srcTexture, dstTexture, level) {
  		var width = srcTexture.image.width
  		var height = srcTexture.image.height
  		var glFormat = utils.convert(dstTexture.format)
  		var glType = utils.convert(dstTexture.type)

  		this.setTexture2D(dstTexture, 0)

  		if (srcTexture.isDataTexture) {
  			_gl.texSubImage2D(_gl.TEXTURE_2D, level || 0, position.x, position.y, width, height, glFormat, glType, srcTexture.image.data)
  		} else {
  			_gl.texSubImage2D(_gl.TEXTURE_2D, level || 0, position.x, position.y, glFormat, glType, srcTexture.image)
  		}
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   */

  function FogExp2 (color, density) {
  	this.name = ''

  	this.color = new Color(color)
  	this.density = (density !== undefined) ? density : 0.00025
  }

  FogExp2.prototype.isFogExp2 = true

  FogExp2.prototype.clone = function () {
  	return new FogExp2(this.color, this.density)
  }

  FogExp2.prototype.toJSON = function (/* meta */) {
  	return {
  		type: 'FogExp2',
  		color: this.color.getHex(),
  		density: this.density
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   */

  function Fog (color, near, far) {
  	this.name = ''

  	this.color = new Color(color)

  	this.near = (near !== undefined) ? near : 1
  	this.far = (far !== undefined) ? far : 1000
  }

  Fog.prototype.isFog = true

  Fog.prototype.clone = function () {
  	return new Fog(this.color, this.near, this.far)
  }

  Fog.prototype.toJSON = function (/* meta */) {
  	return {
  		type: 'Fog',
  		color: this.color.getHex(),
  		near: this.near,
  		far: this.far
  	}
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function Scene () {
  	Object3D.call(this)

  	this.type = 'Scene'

  	this.background = null
  	this.fog = null
  	this.overrideMaterial = null

  	this.autoUpdate = true // checked by the renderer
  }

  Scene.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Scene,

  	copy: function (source, recursive) {
  		Object3D.prototype.copy.call(this, source, recursive)

  		if (source.background !== null) this.background = source.background.clone()
  		if (source.fog !== null) this.fog = source.fog.clone()
  		if (source.overrideMaterial !== null) this.overrideMaterial = source.overrideMaterial.clone()

  		this.autoUpdate = source.autoUpdate
  		this.matrixAutoUpdate = source.matrixAutoUpdate

  		return this
  	},

  	toJSON: function (meta) {
  		var data = Object3D.prototype.toJSON.call(this, meta)

  		if (this.background !== null) data.object.background = this.background.toJSON(meta)
  		if (this.fog !== null) data.object.fog = this.fog.toJSON()

  		return data
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com/
   *
   * parameters = {
   *  color: <hex>,
   *  opacity: <float>,
   *  map: new THREE.Texture( <Image> ),
   *
   *	uvOffset: new THREE.Vector2(),
   *	uvScale: new THREE.Vector2()
   * }
   */

  function SpriteMaterial (parameters) {
  	Material.call(this)

  	this.type = 'SpriteMaterial'

  	this.color = new Color(0xffffff)
  	this.map = null

  	this.rotation = 0

  	this.fog = false
  	this.lights = false

  	this.setValues(parameters)
  }

  SpriteMaterial.prototype = Object.create(Material.prototype)
  SpriteMaterial.prototype.constructor = SpriteMaterial
  SpriteMaterial.prototype.isSpriteMaterial = true

  SpriteMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.color.copy(source.color)
  	this.map = source.map

  	this.rotation = source.rotation

  	return this
  }

  /**
   * @author mikael emtinger / http://gomo.se/
   * @author alteredq / http://alteredqualia.com/
   */

  function Sprite (material) {
  	Object3D.call(this)

  	this.type = 'Sprite'

  	this.material = (material !== undefined) ? material : new SpriteMaterial()

  	this.center = new Vector2(0.5, 0.5)
  }

  Sprite.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Sprite,

  	isSprite: true,

  	raycast: (function () {
  		var intersectPoint = new Vector3()
  		var worldPosition = new Vector3()
  		var worldScale = new Vector3()

  		return function raycast (raycaster, intersects) {
  			worldPosition.setFromMatrixPosition(this.matrixWorld)
  			raycaster.ray.closestPointToPoint(worldPosition, intersectPoint)

  			worldScale.setFromMatrixScale(this.matrixWorld)
  			var guessSizeSq = worldScale.x * worldScale.y / 4

  			if (worldPosition.distanceToSquared(intersectPoint) > guessSizeSq) return

  			var distance = raycaster.ray.origin.distanceTo(intersectPoint)

  			if (distance < raycaster.near || distance > raycaster.far) return

  			intersects.push({

  				distance: distance,
  				point: intersectPoint.clone(),
  				face: null,
  				object: this

  			})
  		}
  	}()),

  	clone: function () {
  		return new this.constructor(this.material).copy(this)
  	},

  	copy: function (source) {
  		Object3D.prototype.copy.call(this, source)

  		if (source.center !== undefined) this.center.copy(source.center)

  		return this
  	}

  })

  /**
   * @author mikael emtinger / http://gomo.se/
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   */

  function LOD () {
  	Object3D.call(this)

  	this.type = 'LOD'

  	Object.defineProperties(this, {
  		levels: {
  			enumerable: true,
  			value: []
  		}
  	})
  }

  LOD.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: LOD,

  	copy: function (source) {
  		Object3D.prototype.copy.call(this, source, false)

  		var levels = source.levels

  		for (var i = 0, l = levels.length; i < l; i++) {
  			var level = levels[i]

  			this.addLevel(level.object.clone(), level.distance)
  		}

  		return this
  	},

  	addLevel: function (object, distance) {
  		if (distance === undefined) distance = 0

  		distance = Math.abs(distance)

  		var levels = this.levels

  		for (var l = 0; l < levels.length; l++) {
  			if (distance < levels[l].distance) {
  				break
  			}
  		}

  		levels.splice(l, 0, { distance: distance, object: object })

  		this.add(object)
  	},

  	getObjectForDistance: function (distance) {
  		var levels = this.levels

  		for (var i = 1, l = levels.length; i < l; i++) {
  			if (distance < levels[i].distance) {
  				break
  			}
  		}

  		return levels[i - 1].object
  	},

  	raycast: (function () {
  		var matrixPosition = new Vector3()

  		return function raycast (raycaster, intersects) {
  			matrixPosition.setFromMatrixPosition(this.matrixWorld)

  			var distance = raycaster.ray.origin.distanceTo(matrixPosition)

  			this.getObjectForDistance(distance).raycast(raycaster, intersects)
  		}
  	}()),

  	update: (function () {
  		var v1 = new Vector3()
  		var v2 = new Vector3()

  		return function update (camera) {
  			var levels = this.levels

  			if (levels.length > 1) {
  				v1.setFromMatrixPosition(camera.matrixWorld)
  				v2.setFromMatrixPosition(this.matrixWorld)

  				var distance = v1.distanceTo(v2)

  				levels[0].object.visible = true

  				for (var i = 1, l = levels.length; i < l; i++) {
  					if (distance >= levels[i].distance) {
  						levels[i - 1].object.visible = false
  						levels[i].object.visible = true
  					} else {
  						break
  					}
  				}

  				for (; i < l; i++) {
  					levels[i].object.visible = false
  				}
  			}
  		}
  	}()),

  	toJSON: function (meta) {
  		var data = Object3D.prototype.toJSON.call(this, meta)

  		data.object.levels = []

  		var levels = this.levels

  		for (var i = 0, l = levels.length; i < l; i++) {
  			var level = levels[i]

  			data.object.levels.push({
  				object: level.object.uuid,
  				distance: level.distance
  			})
  		}

  		return data
  	}

  })

  /**
   * @author mikael emtinger / http://gomo.se/
   * @author alteredq / http://alteredqualia.com/
   * @author michael guerrero / http://realitymeltdown.com
   * @author ikerr / http://verold.com
   */

  function Skeleton (bones, boneInverses) {
  	// copy the bone array

  	bones = bones || []

  	this.bones = bones.slice(0)
  	this.boneMatrices = new Float32Array(this.bones.length * 16)

  	// use the supplied bone inverses or calculate the inverses

  	if (boneInverses === undefined) {
  		this.calculateInverses()
  	} else {
  		if (this.bones.length === boneInverses.length) {
  			this.boneInverses = boneInverses.slice(0)
  		} else {
  			console.warn('THREE.Skeleton boneInverses is the wrong length.')

  			this.boneInverses = []

  			for (var i = 0, il = this.bones.length; i < il; i++) {
  				this.boneInverses.push(new Matrix4())
  			}
  		}
  	}
  }

  Object.assign(Skeleton.prototype, {

  	calculateInverses: function () {
  		this.boneInverses = []

  		for (var i = 0, il = this.bones.length; i < il; i++) {
  			var inverse = new Matrix4()

  			if (this.bones[i]) {
  				inverse.getInverse(this.bones[i].matrixWorld)
  			}

  			this.boneInverses.push(inverse)
  		}
  	},

  	pose: function () {
  		var bone, i, il

  		// recover the bind-time world matrices

  		for (i = 0, il = this.bones.length; i < il; i++) {
  			bone = this.bones[i]

  			if (bone) {
  				bone.matrixWorld.getInverse(this.boneInverses[i])
  			}
  		}

  		// compute the local matrices, positions, rotations and scales

  		for (i = 0, il = this.bones.length; i < il; i++) {
  			bone = this.bones[i]

  			if (bone) {
  				if (bone.parent && bone.parent.isBone) {
  					bone.matrix.getInverse(bone.parent.matrixWorld)
  					bone.matrix.multiply(bone.matrixWorld)
  				} else {
  					bone.matrix.copy(bone.matrixWorld)
  				}

  				bone.matrix.decompose(bone.position, bone.quaternion, bone.scale)
  			}
  		}
  	},

  	update: (function () {
  		var offsetMatrix = new Matrix4()
  		var identityMatrix = new Matrix4()

  		return function update () {
  			var bones = this.bones
  			var boneInverses = this.boneInverses
  			var boneMatrices = this.boneMatrices
  			var boneTexture = this.boneTexture

  			// flatten bone matrices to array

  			for (var i = 0, il = bones.length; i < il; i++) {
  				// compute the offset between the current and the original transform

  				var matrix = bones[i] ? bones[i].matrixWorld : identityMatrix

  				offsetMatrix.multiplyMatrices(matrix, boneInverses[i])
  				offsetMatrix.toArray(boneMatrices, i * 16)
  			}

  			if (boneTexture !== undefined) {
  				boneTexture.needsUpdate = true
  			}
  		}
  	})(),

  	clone: function () {
  		return new Skeleton(this.bones, this.boneInverses)
  	},

  	getBoneByName: function (name) {
  		for (var i = 0, il = this.bones.length; i < il; i++) {
  			var bone = this.bones[i]

  			if (bone.name === name) {
  				return bone
  			}
  		}

  		return undefined
  	}

  })

  /**
   * @author mikael emtinger / http://gomo.se/
   * @author alteredq / http://alteredqualia.com/
   * @author ikerr / http://verold.com
   */

  function Bone () {
  	Object3D.call(this)

  	this.type = 'Bone'
  }

  Bone.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Bone,

  	isBone: true

  })

  /**
   * @author mikael emtinger / http://gomo.se/
   * @author alteredq / http://alteredqualia.com/
   * @author ikerr / http://verold.com
   */

  function SkinnedMesh (geometry, material) {
  	Mesh.call(this, geometry, material)

  	this.type = 'SkinnedMesh'

  	this.bindMode = 'attached'
  	this.bindMatrix = new Matrix4()
  	this.bindMatrixInverse = new Matrix4()

  	var bones = this.initBones()
  	var skeleton = new Skeleton(bones)

  	this.bind(skeleton, this.matrixWorld)

  	this.normalizeSkinWeights()
  }

  SkinnedMesh.prototype = Object.assign(Object.create(Mesh.prototype), {

  	constructor: SkinnedMesh,

  	isSkinnedMesh: true,

  	initBones: function () {
  		var bones = []; var bone; var gbone
  		var i, il

  		if (this.geometry && this.geometry.bones !== undefined) {
  			// first, create array of 'Bone' objects from geometry data

  			for (i = 0, il = this.geometry.bones.length; i < il; i++) {
  				gbone = this.geometry.bones[i]

  				// create new 'Bone' object

  				bone = new Bone()
  				bones.push(bone)

  				// apply values

  				bone.name = gbone.name
  				bone.position.fromArray(gbone.pos)
  				bone.quaternion.fromArray(gbone.rotq)
  				if (gbone.scl !== undefined) bone.scale.fromArray(gbone.scl)
  			}

  			// second, create bone hierarchy

  			for (i = 0, il = this.geometry.bones.length; i < il; i++) {
  				gbone = this.geometry.bones[i]

  				if ((gbone.parent !== -1) && (gbone.parent !== null) && (bones[gbone.parent] !== undefined)) {
  					// subsequent bones in the hierarchy

  					bones[gbone.parent].add(bones[i])
  				} else {
  					// topmost bone, immediate child of the skinned mesh

  					this.add(bones[i])
  				}
  			}
  		}

  		// now the bones are part of the scene graph and children of the skinned mesh.
  		// let's update the corresponding matrices

  		this.updateMatrixWorld(true)

  		return bones
  	},

  	bind: function (skeleton, bindMatrix) {
  		this.skeleton = skeleton

  		if (bindMatrix === undefined) {
  			this.updateMatrixWorld(true)

  			this.skeleton.calculateInverses()

  			bindMatrix = this.matrixWorld
  		}

  		this.bindMatrix.copy(bindMatrix)
  		this.bindMatrixInverse.getInverse(bindMatrix)
  	},

  	pose: function () {
  		this.skeleton.pose()
  	},

  	normalizeSkinWeights: function () {
  		var scale, i

  		if (this.geometry && this.geometry.isGeometry) {
  			for (i = 0; i < this.geometry.skinWeights.length; i++) {
  				var sw = this.geometry.skinWeights[i]

  				scale = 1.0 / sw.manhattanLength()

  				if (scale !== Infinity) {
  					sw.multiplyScalar(scale)
  				} else {
  					sw.set(1, 0, 0, 0) // do something reasonable
  				}
  			}
  		} else if (this.geometry && this.geometry.isBufferGeometry) {
  			var vec = new Vector4()

  			var skinWeight = this.geometry.attributes.skinWeight

  			for (i = 0; i < skinWeight.count; i++) {
  				vec.x = skinWeight.getX(i)
  				vec.y = skinWeight.getY(i)
  				vec.z = skinWeight.getZ(i)
  				vec.w = skinWeight.getW(i)

  				scale = 1.0 / vec.manhattanLength()

  				if (scale !== Infinity) {
  					vec.multiplyScalar(scale)
  				} else {
  					vec.set(1, 0, 0, 0) // do something reasonable
  				}

  				skinWeight.setXYZW(i, vec.x, vec.y, vec.z, vec.w)
  			}
  		}
  	},

  	updateMatrixWorld: function (force) {
  		Mesh.prototype.updateMatrixWorld.call(this, force)

  		if (this.bindMode === 'attached') {
  			this.bindMatrixInverse.getInverse(this.matrixWorld)
  		} else if (this.bindMode === 'detached') {
  			this.bindMatrixInverse.getInverse(this.bindMatrix)
  		} else {
  			console.warn('THREE.SkinnedMesh: Unrecognized bindMode: ' + this.bindMode)
  		}
  	},

  	clone: function () {
  		return new this.constructor(this.geometry, this.material).copy(this)
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   *
   * parameters = {
   *  color: <hex>,
   *  opacity: <float>,
   *
   *  linewidth: <float>,
   *  linecap: "round",
   *  linejoin: "round"
   * }
   */

  function LineBasicMaterial (parameters) {
  	Material.call(this)

  	this.type = 'LineBasicMaterial'

  	this.color = new Color(0xffffff)

  	this.linewidth = 1
  	this.linecap = 'round'
  	this.linejoin = 'round'

  	this.lights = false

  	this.setValues(parameters)
  }

  LineBasicMaterial.prototype = Object.create(Material.prototype)
  LineBasicMaterial.prototype.constructor = LineBasicMaterial

  LineBasicMaterial.prototype.isLineBasicMaterial = true

  LineBasicMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.color.copy(source.color)

  	this.linewidth = source.linewidth
  	this.linecap = source.linecap
  	this.linejoin = source.linejoin

  	return this
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function Line (geometry, material, mode) {
  	if (mode === 1) {
  		console.warn('THREE.Line: parameter THREE.LinePieces no longer supported. Created THREE.LineSegments instead.')
  		return new LineSegments(geometry, material)
  	}

  	Object3D.call(this)

  	this.type = 'Line'

  	this.geometry = geometry !== undefined ? geometry : new BufferGeometry()
  	this.material = material !== undefined ? material : new LineBasicMaterial({ color: Math.random() * 0xffffff })
  }

  Line.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Line,

  	isLine: true,

  	computeLineDistances: (function () {
  		var start = new Vector3()
  		var end = new Vector3()

  		return function computeLineDistances () {
  			var geometry = this.geometry

  			if (geometry.isBufferGeometry) {
  				// we assume non-indexed geometry

  				if (geometry.index === null) {
  					var positionAttribute = geometry.attributes.position
  					var lineDistances = [0]

  					for (var i = 1, l = positionAttribute.count; i < l; i++) {
  						start.fromBufferAttribute(positionAttribute, i - 1)
  						end.fromBufferAttribute(positionAttribute, i)

  						lineDistances[i] = lineDistances[i - 1]
  						lineDistances[i] += start.distanceTo(end)
  					}

  					geometry.addAttribute('lineDistance', new Float32BufferAttribute(lineDistances, 1))
  				} else {
  					console.warn('THREE.Line.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.')
  				}
  			} else if (geometry.isGeometry) {
  				var vertices = geometry.vertices
  				var lineDistances = geometry.lineDistances

  				lineDistances[0] = 0

  				for (var i = 1, l = vertices.length; i < l; i++) {
  					lineDistances[i] = lineDistances[i - 1]
  					lineDistances[i] += vertices[i - 1].distanceTo(vertices[i])
  				}
  			}

  			return this
  		}
  	}()),

  	raycast: (function () {
  		var inverseMatrix = new Matrix4()
  		var ray = new Ray()
  		var sphere = new Sphere()

  		return function raycast (raycaster, intersects) {
  			var precision = raycaster.linePrecision
  			var precisionSq = precision * precision

  			var geometry = this.geometry
  			var matrixWorld = this.matrixWorld

  			// Checking boundingSphere distance to ray

  			if (geometry.boundingSphere === null) geometry.computeBoundingSphere()

  			sphere.copy(geometry.boundingSphere)
  			sphere.applyMatrix4(matrixWorld)

  			if (raycaster.ray.intersectsSphere(sphere) === false) return

  			//

  			inverseMatrix.getInverse(matrixWorld)
  			ray.copy(raycaster.ray).applyMatrix4(inverseMatrix)

  			var vStart = new Vector3()
  			var vEnd = new Vector3()
  			var interSegment = new Vector3()
  			var interRay = new Vector3()
  			var step = (this && this.isLineSegments) ? 2 : 1

  			if (geometry.isBufferGeometry) {
  				var index = geometry.index
  				var attributes = geometry.attributes
  				var positions = attributes.position.array

  				if (index !== null) {
  					var indices = index.array

  					for (var i = 0, l = indices.length - 1; i < l; i += step) {
  						var a = indices[i]
  						var b = indices[i + 1]

  						vStart.fromArray(positions, a * 3)
  						vEnd.fromArray(positions, b * 3)

  						var distSq = ray.distanceSqToSegment(vStart, vEnd, interRay, interSegment)

  						if (distSq > precisionSq) continue

  						interRay.applyMatrix4(this.matrixWorld) // Move back to world space for distance calculation

  						var distance = raycaster.ray.origin.distanceTo(interRay)

  						if (distance < raycaster.near || distance > raycaster.far) continue

  						intersects.push({

  							distance: distance,
  							// What do we want? intersection point on the ray or on the segment??
  							// point: raycaster.ray.at( distance ),
  							point: interSegment.clone().applyMatrix4(this.matrixWorld),
  							index: i,
  							face: null,
  							faceIndex: null,
  							object: this

  						})
  					}
  				} else {
  					for (var i = 0, l = positions.length / 3 - 1; i < l; i += step) {
  						vStart.fromArray(positions, 3 * i)
  						vEnd.fromArray(positions, 3 * i + 3)

  						var distSq = ray.distanceSqToSegment(vStart, vEnd, interRay, interSegment)

  						if (distSq > precisionSq) continue

  						interRay.applyMatrix4(this.matrixWorld) // Move back to world space for distance calculation

  						var distance = raycaster.ray.origin.distanceTo(interRay)

  						if (distance < raycaster.near || distance > raycaster.far) continue

  						intersects.push({

  							distance: distance,
  							// What do we want? intersection point on the ray or on the segment??
  							// point: raycaster.ray.at( distance ),
  							point: interSegment.clone().applyMatrix4(this.matrixWorld),
  							index: i,
  							face: null,
  							faceIndex: null,
  							object: this

  						})
  					}
  				}
  			} else if (geometry.isGeometry) {
  				var vertices = geometry.vertices
  				var nbVertices = vertices.length

  				for (var i = 0; i < nbVertices - 1; i += step) {
  					var distSq = ray.distanceSqToSegment(vertices[i], vertices[i + 1], interRay, interSegment)

  					if (distSq > precisionSq) continue

  					interRay.applyMatrix4(this.matrixWorld) // Move back to world space for distance calculation

  					var distance = raycaster.ray.origin.distanceTo(interRay)

  					if (distance < raycaster.near || distance > raycaster.far) continue

  					intersects.push({

  						distance: distance,
  						// What do we want? intersection point on the ray or on the segment??
  						// point: raycaster.ray.at( distance ),
  						point: interSegment.clone().applyMatrix4(this.matrixWorld),
  						index: i,
  						face: null,
  						faceIndex: null,
  						object: this

  					})
  				}
  			}
  		}
  	}()),

  	clone: function () {
  		return new this.constructor(this.geometry, this.material).copy(this)
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function LineSegments (geometry, material) {
  	Line.call(this, geometry, material)

  	this.type = 'LineSegments'
  }

  LineSegments.prototype = Object.assign(Object.create(Line.prototype), {

  	constructor: LineSegments,

  	isLineSegments: true,

  	computeLineDistances: (function () {
  		var start = new Vector3()
  		var end = new Vector3()

  		return function computeLineDistances () {
  			var geometry = this.geometry

  			if (geometry.isBufferGeometry) {
  				// we assume non-indexed geometry

  				if (geometry.index === null) {
  					var positionAttribute = geometry.attributes.position
  					var lineDistances = []

  					for (var i = 0, l = positionAttribute.count; i < l; i += 2) {
  						start.fromBufferAttribute(positionAttribute, i)
  						end.fromBufferAttribute(positionAttribute, i + 1)

  						lineDistances[i] = (i === 0) ? 0 : lineDistances[i - 1]
  						lineDistances[i + 1] = lineDistances[i] + start.distanceTo(end)
  					}

  					geometry.addAttribute('lineDistance', new Float32BufferAttribute(lineDistances, 1))
  				} else {
  					console.warn('THREE.LineSegments.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.')
  				}
  			} else if (geometry.isGeometry) {
  				var vertices = geometry.vertices
  				var lineDistances = geometry.lineDistances

  				for (var i = 0, l = vertices.length; i < l; i += 2) {
  					start.copy(vertices[i])
  					end.copy(vertices[i + 1])

  					lineDistances[i] = (i === 0) ? 0 : lineDistances[i - 1]
  					lineDistances[i + 1] = lineDistances[i] + start.distanceTo(end)
  				}
  			}

  			return this
  		}
  	}())

  })

  /**
   * @author mgreter / http://github.com/mgreter
   */

  function LineLoop (geometry, material) {
  	Line.call(this, geometry, material)

  	this.type = 'LineLoop'
  }

  LineLoop.prototype = Object.assign(Object.create(Line.prototype), {

  	constructor: LineLoop,

  	isLineLoop: true

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   *
   * parameters = {
   *  color: <hex>,
   *  opacity: <float>,
   *  map: new THREE.Texture( <Image> ),
   *
   *  size: <float>,
   *  sizeAttenuation: <bool>
   *
   *  morphTargets: <bool>
   * }
   */

  function PointsMaterial (parameters) {
  	Material.call(this)

  	this.type = 'PointsMaterial'

  	this.color = new Color(0xffffff)

  	this.map = null

  	this.size = 1
  	this.sizeAttenuation = true

  	this.morphTargets = false

  	this.lights = false

  	this.setValues(parameters)
  }

  PointsMaterial.prototype = Object.create(Material.prototype)
  PointsMaterial.prototype.constructor = PointsMaterial

  PointsMaterial.prototype.isPointsMaterial = true

  PointsMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.color.copy(source.color)

  	this.map = source.map

  	this.size = source.size
  	this.sizeAttenuation = source.sizeAttenuation

  	this.morphTargets = source.morphTargets

  	return this
  }

  /**
   * @author alteredq / http://alteredqualia.com/
   */

  function Points (geometry, material) {
  	Object3D.call(this)

  	this.type = 'Points'

  	this.geometry = geometry !== undefined ? geometry : new BufferGeometry()
  	this.material = material !== undefined ? material : new PointsMaterial({ color: Math.random() * 0xffffff })
  }

  Points.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Points,

  	isPoints: true,

  	raycast: (function () {
  		var inverseMatrix = new Matrix4()
  		var ray = new Ray()
  		var sphere = new Sphere()

  		return function raycast (raycaster, intersects) {
  			var object = this
  			var geometry = this.geometry
  			var matrixWorld = this.matrixWorld
  			var threshold = raycaster.params.Points.threshold

  			// Checking boundingSphere distance to ray

  			if (geometry.boundingSphere === null) geometry.computeBoundingSphere()

  			sphere.copy(geometry.boundingSphere)
  			sphere.applyMatrix4(matrixWorld)
  			sphere.radius += threshold

  			if (raycaster.ray.intersectsSphere(sphere) === false) return

  			//

  			inverseMatrix.getInverse(matrixWorld)
  			ray.copy(raycaster.ray).applyMatrix4(inverseMatrix)

  			var localThreshold = threshold / ((this.scale.x + this.scale.y + this.scale.z) / 3)
  			var localThresholdSq = localThreshold * localThreshold
  			var position = new Vector3()
  			var intersectPoint = new Vector3()

  			function testPoint (point, index) {
  				var rayPointDistanceSq = ray.distanceSqToPoint(point)

  				if (rayPointDistanceSq < localThresholdSq) {
  					ray.closestPointToPoint(point, intersectPoint)
  					intersectPoint.applyMatrix4(matrixWorld)

  					var distance = raycaster.ray.origin.distanceTo(intersectPoint)

  					if (distance < raycaster.near || distance > raycaster.far) return

  					intersects.push({

  						distance: distance,
  						distanceToRay: Math.sqrt(rayPointDistanceSq),
  						point: intersectPoint.clone(),
  						index: index,
  						face: null,
  						object: object

  					})
  				}
  			}

  			if (geometry.isBufferGeometry) {
  				var index = geometry.index
  				var attributes = geometry.attributes
  				var positions = attributes.position.array

  				if (index !== null) {
  					var indices = index.array

  					for (var i = 0, il = indices.length; i < il; i++) {
  						var a = indices[i]

  						position.fromArray(positions, a * 3)

  						testPoint(position, a)
  					}
  				} else {
  					for (var i = 0, l = positions.length / 3; i < l; i++) {
  						position.fromArray(positions, i * 3)

  						testPoint(position, i)
  					}
  				}
  			} else {
  				var vertices = geometry.vertices

  				for (var i = 0, l = vertices.length; i < l; i++) {
  					testPoint(vertices[i], i)
  				}
  			}
  		}
  	}()),

  	clone: function () {
  		return new this.constructor(this.geometry, this.material).copy(this)
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function Group () {
  	Object3D.call(this)

  	this.type = 'Group'
  }

  Group.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Group,

  	isGroup: true

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function VideoTexture (video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy) {
  	Texture.call(this, video, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy)

  	this.generateMipmaps = false
  }

  VideoTexture.prototype = Object.assign(Object.create(Texture.prototype), {

  	constructor: VideoTexture,

  	isVideoTexture: true,

  	update: function () {
  		var video = this.image

  		if (video.readyState >= video.HAVE_CURRENT_DATA) {
  			this.needsUpdate = true
  		}
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com/
   */

  function CompressedTexture (mipmaps, width, height, format, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, encoding) {
  	Texture.call(this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy, encoding)

  	this.image = { width: width, height: height }
  	this.mipmaps = mipmaps

  	// no flipping for cube textures
  	// (also flipping doesn't work for compressed textures )

  	this.flipY = false

  	// can't generate mipmaps for compressed textures
  	// mips must be embedded in DDS files

  	this.generateMipmaps = false
  }

  CompressedTexture.prototype = Object.create(Texture.prototype)
  CompressedTexture.prototype.constructor = CompressedTexture

  CompressedTexture.prototype.isCompressedTexture = true

  /**
   * @author Matt DesLauriers / @mattdesl
   * @author atix / arthursilber.de
   */

  function DepthTexture (width, height, type, mapping, wrapS, wrapT, magFilter, minFilter, anisotropy, format) {
  	format = format !== undefined ? format : DepthFormat

  	if (format !== DepthFormat && format !== DepthStencilFormat) {
  		throw new Error('DepthTexture format must be either THREE.DepthFormat or THREE.DepthStencilFormat')
  	}

  	if (type === undefined && format === DepthFormat) type = UnsignedShortType
  	if (type === undefined && format === DepthStencilFormat) type = UnsignedInt248Type

  	Texture.call(this, null, mapping, wrapS, wrapT, magFilter, minFilter, format, type, anisotropy)

  	this.image = { width: width, height: height }

  	this.magFilter = magFilter !== undefined ? magFilter : NearestFilter
  	this.minFilter = minFilter !== undefined ? minFilter : NearestFilter

  	this.flipY = false
  	this.generateMipmaps	= false
  }

  DepthTexture.prototype = Object.create(Texture.prototype)
  DepthTexture.prototype.constructor = DepthTexture
  DepthTexture.prototype.isDepthTexture = true

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author Mugen87 / https://github.com/Mugen87
   */

  function WireframeGeometry (geometry) {
  	BufferGeometry.call(this)

  	this.type = 'WireframeGeometry'

  	// buffer

  	var vertices = []

  	// helper variables

  	var i, j, l, o, ol
  	var edge = [0, 0]; var edges = {}; var e; var edge1; var edge2
  	var key; var keys = ['a', 'b', 'c']
  	var vertex

  	// different logic for Geometry and BufferGeometry

  	if (geometry && geometry.isGeometry) {
  		// create a data structure that contains all edges without duplicates

  		var faces = geometry.faces

  		for (i = 0, l = faces.length; i < l; i++) {
  			var face = faces[i]

  			for (j = 0; j < 3; j++) {
  				edge1 = face[keys[j]]
  				edge2 = face[keys[(j + 1) % 3]]
  				edge[0] = Math.min(edge1, edge2) // sorting prevents duplicates
  				edge[1] = Math.max(edge1, edge2)

  				key = edge[0] + ',' + edge[1]

  				if (edges[key] === undefined) {
  					edges[key] = { index1: edge[0], index2: edge[1] }
  				}
  			}
  		}

  		// generate vertices

  		for (key in edges) {
  			e = edges[key]

  			vertex = geometry.vertices[e.index1]
  			vertices.push(vertex.x, vertex.y, vertex.z)

  			vertex = geometry.vertices[e.index2]
  			vertices.push(vertex.x, vertex.y, vertex.z)
  		}
  	} else if (geometry && geometry.isBufferGeometry) {
  		var position, indices, groups
  		var group, start, count
  		var index1, index2

  		vertex = new Vector3()

  		if (geometry.index !== null) {
  			// indexed BufferGeometry

  			position = geometry.attributes.position
  			indices = geometry.index
  			groups = geometry.groups

  			if (groups.length === 0) {
  				groups = [{ start: 0, count: indices.count, materialIndex: 0 }]
  			}

  			// create a data structure that contains all eges without duplicates

  			for (o = 0, ol = groups.length; o < ol; ++o) {
  				group = groups[o]

  				start = group.start
  				count = group.count

  				for (i = start, l = (start + count); i < l; i += 3) {
  					for (j = 0; j < 3; j++) {
  						edge1 = indices.getX(i + j)
  						edge2 = indices.getX(i + (j + 1) % 3)
  						edge[0] = Math.min(edge1, edge2) // sorting prevents duplicates
  						edge[1] = Math.max(edge1, edge2)

  						key = edge[0] + ',' + edge[1]

  						if (edges[key] === undefined) {
  							edges[key] = { index1: edge[0], index2: edge[1] }
  						}
  					}
  				}
  			}

  			// generate vertices

  			for (key in edges) {
  				e = edges[key]

  				vertex.fromBufferAttribute(position, e.index1)
  				vertices.push(vertex.x, vertex.y, vertex.z)

  				vertex.fromBufferAttribute(position, e.index2)
  				vertices.push(vertex.x, vertex.y, vertex.z)
  			}
  		} else {
  			// non-indexed BufferGeometry

  			position = geometry.attributes.position

  			for (i = 0, l = (position.count / 3); i < l; i++) {
  				for (j = 0; j < 3; j++) {
  					// three edges per triangle, an edge is represented as (index1, index2)
  					// e.g. the first triangle has the following edges: (0,1),(1,2),(2,0)

  					index1 = 3 * i + j
  					vertex.fromBufferAttribute(position, index1)
  					vertices.push(vertex.x, vertex.y, vertex.z)

  					index2 = 3 * i + ((j + 1) % 3)
  					vertex.fromBufferAttribute(position, index2)
  					vertices.push(vertex.x, vertex.y, vertex.z)
  				}
  			}
  		}
  	}

  	// build geometry

  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  }

  WireframeGeometry.prototype = Object.create(BufferGeometry.prototype)
  WireframeGeometry.prototype.constructor = WireframeGeometry

  /**
   * @author zz85 / https://github.com/zz85
   * @author Mugen87 / https://github.com/Mugen87
   *
   * Parametric Surfaces Geometry
   * based on the brilliant article by @prideout http://prideout.net/blog/?p=44
   */

  // ParametricGeometry

  function ParametricGeometry (func, slices, stacks) {
  	Geometry.call(this)

  	this.type = 'ParametricGeometry'

  	this.parameters = {
  		func: func,
  		slices: slices,
  		stacks: stacks
  	}

  	this.fromBufferGeometry(new ParametricBufferGeometry(func, slices, stacks))
  	this.mergeVertices()
  }

  ParametricGeometry.prototype = Object.create(Geometry.prototype)
  ParametricGeometry.prototype.constructor = ParametricGeometry

  // ParametricBufferGeometry

  function ParametricBufferGeometry (func, slices, stacks) {
  	BufferGeometry.call(this)

  	this.type = 'ParametricBufferGeometry'

  	this.parameters = {
  		func: func,
  		slices: slices,
  		stacks: stacks
  	}

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	var EPS = 0.00001

  	var normal = new Vector3()

  	var p0 = new Vector3(); var p1 = new Vector3()
  	var pu = new Vector3(); var pv = new Vector3()

  	var i, j

  	if (func.length < 3) {
  		console.error('THREE.ParametricGeometry: Function must now modify a Vector3 as third parameter.')
  	}

  	// generate vertices, normals and uvs

  	var sliceCount = slices + 1

  	for (i = 0; i <= stacks; i++) {
  		var v = i / stacks

  		for (j = 0; j <= slices; j++) {
  			var u = j / slices

  			// vertex

  			func(u, v, p0)
  			vertices.push(p0.x, p0.y, p0.z)

  			// normal

  			// approximate tangent vectors via finite differences

  			if (u - EPS >= 0) {
  				func(u - EPS, v, p1)
  				pu.subVectors(p0, p1)
  			} else {
  				func(u + EPS, v, p1)
  				pu.subVectors(p1, p0)
  			}

  			if (v - EPS >= 0) {
  				func(u, v - EPS, p1)
  				pv.subVectors(p0, p1)
  			} else {
  				func(u, v + EPS, p1)
  				pv.subVectors(p1, p0)
  			}

  			// cross product of tangent vectors returns surface normal

  			normal.crossVectors(pu, pv).normalize()
  			normals.push(normal.x, normal.y, normal.z)

  			// uv

  			uvs.push(u, v)
  		}
  	}

  	// generate indices

  	for (i = 0; i < stacks; i++) {
  		for (j = 0; j < slices; j++) {
  			var a = i * sliceCount + j
  			var b = i * sliceCount + j + 1
  			var c = (i + 1) * sliceCount + j + 1
  			var d = (i + 1) * sliceCount + j

  			// faces one and two

  			indices.push(a, b, d)
  			indices.push(b, c, d)
  		}
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))
  }

  ParametricBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  ParametricBufferGeometry.prototype.constructor = ParametricBufferGeometry

  /**
   * @author clockworkgeek / https://github.com/clockworkgeek
   * @author timothypratley / https://github.com/timothypratley
   * @author WestLangley / http://github.com/WestLangley
   * @author Mugen87 / https://github.com/Mugen87
   */

  // PolyhedronGeometry

  function PolyhedronGeometry (vertices, indices, radius, detail) {
  	Geometry.call(this)

  	this.type = 'PolyhedronGeometry'

  	this.parameters = {
  		vertices: vertices,
  		indices: indices,
  		radius: radius,
  		detail: detail
  	}

  	this.fromBufferGeometry(new PolyhedronBufferGeometry(vertices, indices, radius, detail))
  	this.mergeVertices()
  }

  PolyhedronGeometry.prototype = Object.create(Geometry.prototype)
  PolyhedronGeometry.prototype.constructor = PolyhedronGeometry

  // PolyhedronBufferGeometry

  function PolyhedronBufferGeometry (vertices, indices, radius, detail) {
  	BufferGeometry.call(this)

  	this.type = 'PolyhedronBufferGeometry'

  	this.parameters = {
  		vertices: vertices,
  		indices: indices,
  		radius: radius,
  		detail: detail
  	}

  	radius = radius || 1
  	detail = detail || 0

  	// default buffer data

  	var vertexBuffer = []
  	var uvBuffer = []

  	// the subdivision creates the vertex buffer data

  	subdivide(detail)

  	// all vertices should lie on a conceptual sphere with a given radius

  	appplyRadius(radius)

  	// finally, create the uv data

  	generateUVs()

  	// build non-indexed geometry

  	this.addAttribute('position', new Float32BufferAttribute(vertexBuffer, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(vertexBuffer.slice(), 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvBuffer, 2))

  	if (detail === 0) {
  		this.computeVertexNormals() // flat normals
  	} else {
  		this.normalizeNormals() // smooth normals
  	}

  	// helper functions

  	function subdivide (detail) {
  		var a = new Vector3()
  		var b = new Vector3()
  		var c = new Vector3()

  		// iterate over all faces and apply a subdivison with the given detail value

  		for (var i = 0; i < indices.length; i += 3) {
  			// get the vertices of the face

  			getVertexByIndex(indices[i + 0], a)
  			getVertexByIndex(indices[i + 1], b)
  			getVertexByIndex(indices[i + 2], c)

  			// perform subdivision

  			subdivideFace(a, b, c, detail)
  		}
  	}

  	function subdivideFace (a, b, c, detail) {
  		var cols = Math.pow(2, detail)

  		// we use this multidimensional array as a data structure for creating the subdivision

  		var v = []

  		var i, j

  		// construct all of the vertices for this subdivision

  		for (i = 0; i <= cols; i++) {
  			v[i] = []

  			var aj = a.clone().lerp(c, i / cols)
  			var bj = b.clone().lerp(c, i / cols)

  			var rows = cols - i

  			for (j = 0; j <= rows; j++) {
  				if (j === 0 && i === cols) {
  					v[i][j] = aj
  				} else {
  					v[i][j] = aj.clone().lerp(bj, j / rows)
  				}
  			}
  		}

  		// construct all of the faces

  		for (i = 0; i < cols; i++) {
  			for (j = 0; j < 2 * (cols - i) - 1; j++) {
  				var k = Math.floor(j / 2)

  				if (j % 2 === 0) {
  					pushVertex(v[i][k + 1])
  					pushVertex(v[i + 1][k])
  					pushVertex(v[i][k])
  				} else {
  					pushVertex(v[i][k + 1])
  					pushVertex(v[i + 1][k + 1])
  					pushVertex(v[i + 1][k])
  				}
  			}
  		}
  	}

  	function appplyRadius (radius) {
  		var vertex = new Vector3()

  		// iterate over the entire buffer and apply the radius to each vertex

  		for (var i = 0; i < vertexBuffer.length; i += 3) {
  			vertex.x = vertexBuffer[i + 0]
  			vertex.y = vertexBuffer[i + 1]
  			vertex.z = vertexBuffer[i + 2]

  			vertex.normalize().multiplyScalar(radius)

  			vertexBuffer[i + 0] = vertex.x
  			vertexBuffer[i + 1] = vertex.y
  			vertexBuffer[i + 2] = vertex.z
  		}
  	}

  	function generateUVs () {
  		var vertex = new Vector3()

  		for (var i = 0; i < vertexBuffer.length; i += 3) {
  			vertex.x = vertexBuffer[i + 0]
  			vertex.y = vertexBuffer[i + 1]
  			vertex.z = vertexBuffer[i + 2]

  			var u = azimuth(vertex) / 2 / Math.PI + 0.5
  			var v = inclination(vertex) / Math.PI + 0.5
  			uvBuffer.push(u, 1 - v)
  		}

  		correctUVs()

  		correctSeam()
  	}

  	function correctSeam () {
  		// handle case when face straddles the seam, see #3269

  		for (var i = 0; i < uvBuffer.length; i += 6) {
  			// uv data of a single face

  			var x0 = uvBuffer[i + 0]
  			var x1 = uvBuffer[i + 2]
  			var x2 = uvBuffer[i + 4]

  			var max = Math.max(x0, x1, x2)
  			var min = Math.min(x0, x1, x2)

  			// 0.9 is somewhat arbitrary

  			if (max > 0.9 && min < 0.1) {
  				if (x0 < 0.2) uvBuffer[i + 0] += 1
  				if (x1 < 0.2) uvBuffer[i + 2] += 1
  				if (x2 < 0.2) uvBuffer[i + 4] += 1
  			}
  		}
  	}

  	function pushVertex (vertex) {
  		vertexBuffer.push(vertex.x, vertex.y, vertex.z)
  	}

  	function getVertexByIndex (index, vertex) {
  		var stride = index * 3

  		vertex.x = vertices[stride + 0]
  		vertex.y = vertices[stride + 1]
  		vertex.z = vertices[stride + 2]
  	}

  	function correctUVs () {
  		var a = new Vector3()
  		var b = new Vector3()
  		var c = new Vector3()

  		var centroid = new Vector3()

  		var uvA = new Vector2()
  		var uvB = new Vector2()
  		var uvC = new Vector2()

  		for (var i = 0, j = 0; i < vertexBuffer.length; i += 9, j += 6) {
  			a.set(vertexBuffer[i + 0], vertexBuffer[i + 1], vertexBuffer[i + 2])
  			b.set(vertexBuffer[i + 3], vertexBuffer[i + 4], vertexBuffer[i + 5])
  			c.set(vertexBuffer[i + 6], vertexBuffer[i + 7], vertexBuffer[i + 8])

  			uvA.set(uvBuffer[j + 0], uvBuffer[j + 1])
  			uvB.set(uvBuffer[j + 2], uvBuffer[j + 3])
  			uvC.set(uvBuffer[j + 4], uvBuffer[j + 5])

  			centroid.copy(a).add(b).add(c).divideScalar(3)

  			var azi = azimuth(centroid)

  			correctUV(uvA, j + 0, a, azi)
  			correctUV(uvB, j + 2, b, azi)
  			correctUV(uvC, j + 4, c, azi)
  		}
  	}

  	function correctUV (uv, stride, vector, azimuth) {
  		if ((azimuth < 0) && (uv.x === 1)) {
  			uvBuffer[stride] = uv.x - 1
  		}

  		if ((vector.x === 0) && (vector.z === 0)) {
  			uvBuffer[stride] = azimuth / 2 / Math.PI + 0.5
  		}
  	}

  	// Angle around the Y axis, counter-clockwise when looking from above.

  	function azimuth (vector) {
  		return Math.atan2(vector.z, -vector.x)
  	}

  	// Angle above the XZ plane.

  	function inclination (vector) {
  		return Math.atan2(-vector.y, Math.sqrt((vector.x * vector.x) + (vector.z * vector.z)))
  	}
  }

  PolyhedronBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  PolyhedronBufferGeometry.prototype.constructor = PolyhedronBufferGeometry

  /**
   * @author timothypratley / https://github.com/timothypratley
   * @author Mugen87 / https://github.com/Mugen87
   */

  // TetrahedronGeometry

  function TetrahedronGeometry (radius, detail) {
  	Geometry.call(this)

  	this.type = 'TetrahedronGeometry'

  	this.parameters = {
  		radius: radius,
  		detail: detail
  	}

  	this.fromBufferGeometry(new TetrahedronBufferGeometry(radius, detail))
  	this.mergeVertices()
  }

  TetrahedronGeometry.prototype = Object.create(Geometry.prototype)
  TetrahedronGeometry.prototype.constructor = TetrahedronGeometry

  // TetrahedronBufferGeometry

  function TetrahedronBufferGeometry (radius, detail) {
  	var vertices = [
  		1, 1, 1, 	-1, -1, 1, 	-1, 1, -1, 	1, -1, -1
  	]

  	var indices = [
  		2, 1, 0, 	0, 3, 2,	1, 3, 0,	2, 3, 1
  	]

  	PolyhedronBufferGeometry.call(this, vertices, indices, radius, detail)

  	this.type = 'TetrahedronBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		detail: detail
  	}
  }

  TetrahedronBufferGeometry.prototype = Object.create(PolyhedronBufferGeometry.prototype)
  TetrahedronBufferGeometry.prototype.constructor = TetrahedronBufferGeometry

  /**
   * @author timothypratley / https://github.com/timothypratley
   * @author Mugen87 / https://github.com/Mugen87
   */

  // OctahedronGeometry

  function OctahedronGeometry (radius, detail) {
  	Geometry.call(this)

  	this.type = 'OctahedronGeometry'

  	this.parameters = {
  		radius: radius,
  		detail: detail
  	}

  	this.fromBufferGeometry(new OctahedronBufferGeometry(radius, detail))
  	this.mergeVertices()
  }

  OctahedronGeometry.prototype = Object.create(Geometry.prototype)
  OctahedronGeometry.prototype.constructor = OctahedronGeometry

  // OctahedronBufferGeometry

  function OctahedronBufferGeometry (radius, detail) {
  	var vertices = [
  		1, 0, 0, 	-1, 0, 0,	0, 1, 0,
  		0, -1, 0, 	0, 0, 1,	0, 0, -1
  	]

  	var indices = [
  		0, 2, 4,	0, 4, 3,	0, 3, 5,
  		0, 5, 2,	1, 2, 5,	1, 5, 3,
  		1, 3, 4,	1, 4, 2
  	]

  	PolyhedronBufferGeometry.call(this, vertices, indices, radius, detail)

  	this.type = 'OctahedronBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		detail: detail
  	}
  }

  OctahedronBufferGeometry.prototype = Object.create(PolyhedronBufferGeometry.prototype)
  OctahedronBufferGeometry.prototype.constructor = OctahedronBufferGeometry

  /**
   * @author timothypratley / https://github.com/timothypratley
   * @author Mugen87 / https://github.com/Mugen87
   */

  // IcosahedronGeometry

  function IcosahedronGeometry (radius, detail) {
  	Geometry.call(this)

  	this.type = 'IcosahedronGeometry'

  	this.parameters = {
  		radius: radius,
  		detail: detail
  	}

  	this.fromBufferGeometry(new IcosahedronBufferGeometry(radius, detail))
  	this.mergeVertices()
  }

  IcosahedronGeometry.prototype = Object.create(Geometry.prototype)
  IcosahedronGeometry.prototype.constructor = IcosahedronGeometry

  // IcosahedronBufferGeometry

  function IcosahedronBufferGeometry (radius, detail) {
  	var t = (1 + Math.sqrt(5)) / 2

  	var vertices = [
  		-1, t, 0, 	1, t, 0, 	-1, -t, 0, 	1, -t, 0,
  		 0, -1, t, 	0, 1, t,	0, -1, -t, 	0, 1, -t,
  		 t, 0, -1, 	t, 0, 1, 	-t, 0, -1, 	-t, 0, 1
  	]

  	var indices = [
  		 0, 11, 5, 	0, 5, 1, 	0, 1, 7, 	0, 7, 10, 	0, 10, 11,
  		 1, 5, 9, 	5, 11, 4,	11, 10, 2,	10, 7, 6,	7, 1, 8,
  		 3, 9, 4, 	3, 4, 2,	3, 2, 6,	3, 6, 8,	3, 8, 9,
  		 4, 9, 5, 	2, 4, 11,	6, 2, 10,	8, 6, 7,	9, 8, 1
  	]

  	PolyhedronBufferGeometry.call(this, vertices, indices, radius, detail)

  	this.type = 'IcosahedronBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		detail: detail
  	}
  }

  IcosahedronBufferGeometry.prototype = Object.create(PolyhedronBufferGeometry.prototype)
  IcosahedronBufferGeometry.prototype.constructor = IcosahedronBufferGeometry

  /**
   * @author Abe Pazos / https://hamoid.com
   * @author Mugen87 / https://github.com/Mugen87
   */

  // DodecahedronGeometry

  function DodecahedronGeometry (radius, detail) {
  	Geometry.call(this)

  	this.type = 'DodecahedronGeometry'

  	this.parameters = {
  		radius: radius,
  		detail: detail
  	}

  	this.fromBufferGeometry(new DodecahedronBufferGeometry(radius, detail))
  	this.mergeVertices()
  }

  DodecahedronGeometry.prototype = Object.create(Geometry.prototype)
  DodecahedronGeometry.prototype.constructor = DodecahedronGeometry

  // DodecahedronBufferGeometry

  function DodecahedronBufferGeometry (radius, detail) {
  	var t = (1 + Math.sqrt(5)) / 2
  	var r = 1 / t

  	var vertices = [

  		// (±1, ±1, ±1)
  		-1, -1, -1,	-1, -1, 1,
  		-1, 1, -1, -1, 1, 1,
  		1, -1, -1, 1, -1, 1,
  		1, 1, -1, 1, 1, 1,

  		// (0, ±1/φ, ±φ)
  		 0, -r, -t, 0, -r, t,
  		 0, r, -t, 0, r, t,

  		// (±1/φ, ±φ, 0)
  		-r, -t, 0, -r, t, 0,
  		 r, -t, 0, r, t, 0,

  		// (±φ, 0, ±1/φ)
  		-t, 0, -r, t, 0, -r,
  		-t, 0, r, t, 0, r
  	]

  	var indices = [
  		3, 11, 7, 	3, 7, 15, 	3, 15, 13,
  		7, 19, 17, 	7, 17, 6, 	7, 6, 15,
  		17, 4, 8, 	17, 8, 10, 	17, 10, 6,
  		8, 0, 16, 	8, 16, 2, 	8, 2, 10,
  		0, 12, 1, 	0, 1, 18, 	0, 18, 16,
  		6, 10, 2, 	6, 2, 13, 	6, 13, 15,
  		2, 16, 18, 	2, 18, 3, 	2, 3, 13,
  		18, 1, 9, 	18, 9, 11, 	18, 11, 3,
  		4, 14, 12, 	4, 12, 0, 	4, 0, 8,
  		11, 9, 5, 	11, 5, 19, 	11, 19, 7,
  		19, 5, 14, 	19, 14, 4, 	19, 4, 17,
  		1, 12, 14, 	1, 14, 5, 	1, 5, 9
  	]

  	PolyhedronBufferGeometry.call(this, vertices, indices, radius, detail)

  	this.type = 'DodecahedronBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		detail: detail
  	}
  }

  DodecahedronBufferGeometry.prototype = Object.create(PolyhedronBufferGeometry.prototype)
  DodecahedronBufferGeometry.prototype.constructor = DodecahedronBufferGeometry

  /**
   * @author oosmoxiecode / https://github.com/oosmoxiecode
   * @author WestLangley / https://github.com/WestLangley
   * @author zz85 / https://github.com/zz85
   * @author miningold / https://github.com/miningold
   * @author jonobr1 / https://github.com/jonobr1
   * @author Mugen87 / https://github.com/Mugen87
   *
   */

  // TubeGeometry

  function TubeGeometry (path, tubularSegments, radius, radialSegments, closed, taper) {
  	Geometry.call(this)

  	this.type = 'TubeGeometry'

  	this.parameters = {
  		path: path,
  		tubularSegments: tubularSegments,
  		radius: radius,
  		radialSegments: radialSegments,
  		closed: closed
  	}

  	if (taper !== undefined) console.warn('THREE.TubeGeometry: taper has been removed.')

  	var bufferGeometry = new TubeBufferGeometry(path, tubularSegments, radius, radialSegments, closed)

  	// expose internals

  	this.tangents = bufferGeometry.tangents
  	this.normals = bufferGeometry.normals
  	this.binormals = bufferGeometry.binormals

  	// create geometry

  	this.fromBufferGeometry(bufferGeometry)
  	this.mergeVertices()
  }

  TubeGeometry.prototype = Object.create(Geometry.prototype)
  TubeGeometry.prototype.constructor = TubeGeometry

  // TubeBufferGeometry

  function TubeBufferGeometry (path, tubularSegments, radius, radialSegments, closed) {
  	BufferGeometry.call(this)

  	this.type = 'TubeBufferGeometry'

  	this.parameters = {
  		path: path,
  		tubularSegments: tubularSegments,
  		radius: radius,
  		radialSegments: radialSegments,
  		closed: closed
  	}

  	tubularSegments = tubularSegments || 64
  	radius = radius || 1
  	radialSegments = radialSegments || 8
  	closed = closed || false

  	var frames = path.computeFrenetFrames(tubularSegments, closed)

  	// expose internals

  	this.tangents = frames.tangents
  	this.normals = frames.normals
  	this.binormals = frames.binormals

  	// helper variables

  	var vertex = new Vector3()
  	var normal = new Vector3()
  	var uv = new Vector2()
  	var P = new Vector3()

  	var i, j

  	// buffer

  	var vertices = []
  	var normals = []
  	var uvs = []
  	var indices = []

  	// create buffer data

  	generateBufferData()

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))

  	// functions

  	function generateBufferData () {
  		for (i = 0; i < tubularSegments; i++) {
  			generateSegment(i)
  		}

  		// if the geometry is not closed, generate the last row of vertices and normals
  		// at the regular position on the given path
  		//
  		// if the geometry is closed, duplicate the first row of vertices and normals (uvs will differ)

  		generateSegment((closed === false) ? tubularSegments : 0)

  		// uvs are generated in a separate function.
  		// this makes it easy compute correct values for closed geometries

  		generateUVs()

  		// finally create faces

  		generateIndices()
  	}

  	function generateSegment (i) {
  		// we use getPointAt to sample evenly distributed points from the given path

  		P = path.getPointAt(i / tubularSegments, P)

  		// retrieve corresponding normal and binormal

  		var N = frames.normals[i]
  		var B = frames.binormals[i]

  		// generate normals and vertices for the current segment

  		for (j = 0; j <= radialSegments; j++) {
  			var v = j / radialSegments * Math.PI * 2

  			var sin = Math.sin(v)
  			var cos = -Math.cos(v)

  			// normal

  			normal.x = (cos * N.x + sin * B.x)
  			normal.y = (cos * N.y + sin * B.y)
  			normal.z = (cos * N.z + sin * B.z)
  			normal.normalize()

  			normals.push(normal.x, normal.y, normal.z)

  			// vertex

  			vertex.x = P.x + radius * normal.x
  			vertex.y = P.y + radius * normal.y
  			vertex.z = P.z + radius * normal.z

  			vertices.push(vertex.x, vertex.y, vertex.z)
  		}
  	}

  	function generateIndices () {
  		for (j = 1; j <= tubularSegments; j++) {
  			for (i = 1; i <= radialSegments; i++) {
  				var a = (radialSegments + 1) * (j - 1) + (i - 1)
  				var b = (radialSegments + 1) * j + (i - 1)
  				var c = (radialSegments + 1) * j + i
  				var d = (radialSegments + 1) * (j - 1) + i

  				// faces

  				indices.push(a, b, d)
  				indices.push(b, c, d)
  			}
  		}
  	}

  	function generateUVs () {
  		for (i = 0; i <= tubularSegments; i++) {
  			for (j = 0; j <= radialSegments; j++) {
  				uv.x = i / tubularSegments
  				uv.y = j / radialSegments

  				uvs.push(uv.x, uv.y)
  			}
  		}
  	}
  }

  TubeBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  TubeBufferGeometry.prototype.constructor = TubeBufferGeometry

  /**
   * @author oosmoxiecode
   * @author Mugen87 / https://github.com/Mugen87
   *
   * based on http://www.blackpawn.com/texts/pqtorus/
   */

  // TorusKnotGeometry

  function TorusKnotGeometry (radius, tube, tubularSegments, radialSegments, p, q, heightScale) {
  	Geometry.call(this)

  	this.type = 'TorusKnotGeometry'

  	this.parameters = {
  		radius: radius,
  		tube: tube,
  		tubularSegments: tubularSegments,
  		radialSegments: radialSegments,
  		p: p,
  		q: q
  	}

  	if (heightScale !== undefined) console.warn('THREE.TorusKnotGeometry: heightScale has been deprecated. Use .scale( x, y, z ) instead.')

  	this.fromBufferGeometry(new TorusKnotBufferGeometry(radius, tube, tubularSegments, radialSegments, p, q))
  	this.mergeVertices()
  }

  TorusKnotGeometry.prototype = Object.create(Geometry.prototype)
  TorusKnotGeometry.prototype.constructor = TorusKnotGeometry

  // TorusKnotBufferGeometry

  function TorusKnotBufferGeometry (radius, tube, tubularSegments, radialSegments, p, q) {
  	BufferGeometry.call(this)

  	this.type = 'TorusKnotBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		tube: tube,
  		tubularSegments: tubularSegments,
  		radialSegments: radialSegments,
  		p: p,
  		q: q
  	}

  	radius = radius || 1
  	tube = tube || 0.4
  	tubularSegments = Math.floor(tubularSegments) || 64
  	radialSegments = Math.floor(radialSegments) || 8
  	p = p || 2
  	q = q || 3

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// helper variables

  	var i, j

  	var vertex = new Vector3()
  	var normal = new Vector3()

  	var P1 = new Vector3()
  	var P2 = new Vector3()

  	var B = new Vector3()
  	var T = new Vector3()
  	var N = new Vector3()

  	// generate vertices, normals and uvs

  	for (i = 0; i <= tubularSegments; ++i) {
  		// the radian "u" is used to calculate the position on the torus curve of the current tubular segement

  		var u = i / tubularSegments * p * Math.PI * 2

  		// now we calculate two points. P1 is our current position on the curve, P2 is a little farther ahead.
  		// these points are used to create a special "coordinate space", which is necessary to calculate the correct vertex positions

  		calculatePositionOnCurve(u, p, q, radius, P1)
  		calculatePositionOnCurve(u + 0.01, p, q, radius, P2)

  		// calculate orthonormal basis

  		T.subVectors(P2, P1)
  		N.addVectors(P2, P1)
  		B.crossVectors(T, N)
  		N.crossVectors(B, T)

  		// normalize B, N. T can be ignored, we don't use it

  		B.normalize()
  		N.normalize()

  		for (j = 0; j <= radialSegments; ++j) {
  			// now calculate the vertices. they are nothing more than an extrusion of the torus curve.
  			// because we extrude a shape in the xy-plane, there is no need to calculate a z-value.

  			var v = j / radialSegments * Math.PI * 2
  			var cx = -tube * Math.cos(v)
  			var cy = tube * Math.sin(v)

  			// now calculate the final vertex position.
  			// first we orient the extrusion with our basis vectos, then we add it to the current position on the curve

  			vertex.x = P1.x + (cx * N.x + cy * B.x)
  			vertex.y = P1.y + (cx * N.y + cy * B.y)
  			vertex.z = P1.z + (cx * N.z + cy * B.z)

  			vertices.push(vertex.x, vertex.y, vertex.z)

  			// normal (P1 is always the center/origin of the extrusion, thus we can use it to calculate the normal)

  			normal.subVectors(vertex, P1).normalize()

  			normals.push(normal.x, normal.y, normal.z)

  			// uv

  			uvs.push(i / tubularSegments)
  			uvs.push(j / radialSegments)
  		}
  	}

  	// generate indices

  	for (j = 1; j <= tubularSegments; j++) {
  		for (i = 1; i <= radialSegments; i++) {
  			// indices

  			var a = (radialSegments + 1) * (j - 1) + (i - 1)
  			var b = (radialSegments + 1) * j + (i - 1)
  			var c = (radialSegments + 1) * j + i
  			var d = (radialSegments + 1) * (j - 1) + i

  			// faces

  			indices.push(a, b, d)
  			indices.push(b, c, d)
  		}
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))

  	// this function calculates the current position on the torus curve

  	function calculatePositionOnCurve (u, p, q, radius, position) {
  		var cu = Math.cos(u)
  		var su = Math.sin(u)
  		var quOverP = q / p * u
  		var cs = Math.cos(quOverP)

  		position.x = radius * (2 + cs) * 0.5 * cu
  		position.y = radius * (2 + cs) * su * 0.5
  		position.z = radius * Math.sin(quOverP) * 0.5
  	}
  }

  TorusKnotBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  TorusKnotBufferGeometry.prototype.constructor = TorusKnotBufferGeometry

  /**
   * @author oosmoxiecode
   * @author mrdoob / http://mrdoob.com/
   * @author Mugen87 / https://github.com/Mugen87
   */

  // TorusGeometry

  function TorusGeometry (radius, tube, radialSegments, tubularSegments, arc) {
  	Geometry.call(this)

  	this.type = 'TorusGeometry'

  	this.parameters = {
  		radius: radius,
  		tube: tube,
  		radialSegments: radialSegments,
  		tubularSegments: tubularSegments,
  		arc: arc
  	}

  	this.fromBufferGeometry(new TorusBufferGeometry(radius, tube, radialSegments, tubularSegments, arc))
  	this.mergeVertices()
  }

  TorusGeometry.prototype = Object.create(Geometry.prototype)
  TorusGeometry.prototype.constructor = TorusGeometry

  // TorusBufferGeometry

  function TorusBufferGeometry (radius, tube, radialSegments, tubularSegments, arc) {
  	BufferGeometry.call(this)

  	this.type = 'TorusBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		tube: tube,
  		radialSegments: radialSegments,
  		tubularSegments: tubularSegments,
  		arc: arc
  	}

  	radius = radius || 1
  	tube = tube || 0.4
  	radialSegments = Math.floor(radialSegments) || 8
  	tubularSegments = Math.floor(tubularSegments) || 6
  	arc = arc || Math.PI * 2

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// helper variables

  	var center = new Vector3()
  	var vertex = new Vector3()
  	var normal = new Vector3()

  	var j, i

  	// generate vertices, normals and uvs

  	for (j = 0; j <= radialSegments; j++) {
  		for (i = 0; i <= tubularSegments; i++) {
  			var u = i / tubularSegments * arc
  			var v = j / radialSegments * Math.PI * 2

  			// vertex

  			vertex.x = (radius + tube * Math.cos(v)) * Math.cos(u)
  			vertex.y = (radius + tube * Math.cos(v)) * Math.sin(u)
  			vertex.z = tube * Math.sin(v)

  			vertices.push(vertex.x, vertex.y, vertex.z)

  			// normal

  			center.x = radius * Math.cos(u)
  			center.y = radius * Math.sin(u)
  			normal.subVectors(vertex, center).normalize()

  			normals.push(normal.x, normal.y, normal.z)

  			// uv

  			uvs.push(i / tubularSegments)
  			uvs.push(j / radialSegments)
  		}
  	}

  	// generate indices

  	for (j = 1; j <= radialSegments; j++) {
  		for (i = 1; i <= tubularSegments; i++) {
  			// indices

  			var a = (tubularSegments + 1) * j + i - 1
  			var b = (tubularSegments + 1) * (j - 1) + i - 1
  			var c = (tubularSegments + 1) * (j - 1) + i
  			var d = (tubularSegments + 1) * j + i

  			// faces

  			indices.push(a, b, d)
  			indices.push(b, c, d)
  		}
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))
  }

  TorusBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  TorusBufferGeometry.prototype.constructor = TorusBufferGeometry

  /**
   * @author Mugen87 / https://github.com/Mugen87
   * Port from https://github.com/mapbox/earcut (v2.1.2)
   */

  var Earcut = {

  	triangulate: function (data, holeIndices, dim) {
  		dim = dim || 2

  		var hasHoles = holeIndices && holeIndices.length
  			var outerLen = hasHoles ? holeIndices[0] * dim : data.length
  			var outerNode = linkedList(data, 0, outerLen, dim, true)
  			var triangles = []

  		if (!outerNode) return triangles

  		var minX, minY, maxX, maxY, x, y, invSize

  		if (hasHoles) outerNode = eliminateHoles(data, holeIndices, outerNode, dim)

  		// if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox

  		if (data.length > 80 * dim) {
  			minX = maxX = data[0]
  			minY = maxY = data[1]

  			for (var i = dim; i < outerLen; i += dim) {
  				x = data[i]
  				y = data[i + 1]
  				if (x < minX) minX = x
  				if (y < minY) minY = y
  				if (x > maxX) maxX = x
  				if (y > maxY) maxY = y
  			}

  			// minX, minY and invSize are later used to transform coords into integers for z-order calculation

  			invSize = Math.max(maxX - minX, maxY - minY)
  			invSize = invSize !== 0 ? 1 / invSize : 0
  		}

  		earcutLinked(outerNode, triangles, dim, minX, minY, invSize)

  		return triangles
  	}

  }

  // create a circular doubly linked list from polygon points in the specified winding order

  function linkedList (data, start, end, dim, clockwise) {
  	var i, last

  	if (clockwise === (signedArea(data, start, end, dim) > 0)) {
  		for (i = start; i < end; i += dim) last = insertNode(i, data[i], data[i + 1], last)
  	} else {
  		for (i = end - dim; i >= start; i -= dim) last = insertNode(i, data[i], data[i + 1], last)
  	}

  	if (last && equals(last, last.next)) {
  		removeNode(last)
  		last = last.next
  	}

  	return last
  }

  // eliminate colinear or duplicate points

  function filterPoints (start, end) {
  	if (!start) return start
  	if (!end) end = start

  	var p = start; var again

  	do {
  		again = false

  		if (!p.steiner && (equals(p, p.next) || area(p.prev, p, p.next) === 0)) {
  			removeNode(p)
  			p = end = p.prev
  			if (p === p.next) break
  			again = true
  		} else {
  			p = p.next
  		}
  	} while (again || p !== end)

  	return end
  }

  // main ear slicing loop which triangulates a polygon (given as a linked list)

  function earcutLinked (ear, triangles, dim, minX, minY, invSize, pass) {
  	if (!ear) return

  	// interlink polygon nodes in z-order

  	if (!pass && invSize) indexCurve(ear, minX, minY, invSize)

  	var stop = ear; var prev; var next

  	// iterate through ears, slicing them one by one

  	while (ear.prev !== ear.next) {
  		prev = ear.prev
  		next = ear.next

  		if (invSize ? isEarHashed(ear, minX, minY, invSize) : isEar(ear)) {
  			// cut off the triangle
  			triangles.push(prev.i / dim)
  			triangles.push(ear.i / dim)
  			triangles.push(next.i / dim)

  			removeNode(ear)

  			// skipping the next vertice leads to less sliver triangles
  			ear = next.next
  			stop = next.next

  			continue
  		}

  		ear = next

  		// if we looped through the whole remaining polygon and can't find any more ears

  		if (ear === stop) {
  			// try filtering points and slicing again

  			if (!pass) {
  				earcutLinked(filterPoints(ear), triangles, dim, minX, minY, invSize, 1)

  				// if this didn't work, try curing all small self-intersections locally
  			} else if (pass === 1) {
  				ear = cureLocalIntersections(ear, triangles, dim)
  				earcutLinked(ear, triangles, dim, minX, minY, invSize, 2)

  			// as a last resort, try splitting the remaining polygon into two
  			} else if (pass === 2) {
  				splitEarcut(ear, triangles, dim, minX, minY, invSize)
  			}

  			break
  		}
  	}
  }

  // check whether a polygon node forms a valid ear with adjacent nodes

  function isEar (ear) {
  	var a = ear.prev
  		var b = ear
  		var c = ear.next

  	if (area(a, b, c) >= 0) return false // reflex, can't be an ear

  	// now make sure we don't have other points inside the potential ear
  	var p = ear.next.next

  	while (p !== ear.prev) {
  		if (pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) && area(p.prev, p, p.next) >= 0) {
  			return false
  		}

  		p = p.next
  	}

  	return true
  }

  function isEarHashed (ear, minX, minY, invSize) {
  	var a = ear.prev
  		var b = ear
  		var c = ear.next

  	if (area(a, b, c) >= 0) return false // reflex, can't be an ear

  	// triangle bbox; min & max are calculated like this for speed

  	var minTX = a.x < b.x ? (a.x < c.x ? a.x : c.x) : (b.x < c.x ? b.x : c.x)
  		var minTY = a.y < b.y ? (a.y < c.y ? a.y : c.y) : (b.y < c.y ? b.y : c.y)
  		var maxTX = a.x > b.x ? (a.x > c.x ? a.x : c.x) : (b.x > c.x ? b.x : c.x)
  		var maxTY = a.y > b.y ? (a.y > c.y ? a.y : c.y) : (b.y > c.y ? b.y : c.y)

  	// z-order range for the current triangle bbox;

  	var minZ = zOrder(minTX, minTY, minX, minY, invSize)
  		var maxZ = zOrder(maxTX, maxTY, minX, minY, invSize)

  	// first look for points inside the triangle in increasing z-order

  	var p = ear.nextZ

  	while (p && p.z <= maxZ) {
  		if (p !== ear.prev && p !== ear.next &&
  				pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&
  				area(p.prev, p, p.next) >= 0) return false
  		p = p.nextZ
  	}

  	// then look for points in decreasing z-order

  	p = ear.prevZ

  	while (p && p.z >= minZ) {
  		if (p !== ear.prev && p !== ear.next &&
  				pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&
  				area(p.prev, p, p.next) >= 0) return false

  		p = p.prevZ
  	}

  	return true
  }

  // go through all polygon nodes and cure small local self-intersections

  function cureLocalIntersections (start, triangles, dim) {
  	var p = start

  	do {
  		var a = p.prev; var b = p.next.next

  		if (!equals(a, b) && intersects(a, p, p.next, b) && locallyInside(a, b) && locallyInside(b, a)) {
  			triangles.push(a.i / dim)
  			triangles.push(p.i / dim)
  			triangles.push(b.i / dim)

  			// remove two nodes involved

  			removeNode(p)
  			removeNode(p.next)

  			p = start = b
  		}

  		p = p.next
  	} while (p !== start)

  	return p
  }

  // try splitting polygon into two and triangulate them independently

  function splitEarcut (start, triangles, dim, minX, minY, invSize) {
  	// look for a valid diagonal that divides the polygon into two

  	var a = start

  	do {
  		var b = a.next.next

  		while (b !== a.prev) {
  			if (a.i !== b.i && isValidDiagonal(a, b)) {
  				// split the polygon in two by the diagonal

  				var c = splitPolygon(a, b)

  				// filter colinear points around the cuts

  				a = filterPoints(a, a.next)
  				c = filterPoints(c, c.next)

  				// run earcut on each half

  				earcutLinked(a, triangles, dim, minX, minY, invSize)
  				earcutLinked(c, triangles, dim, minX, minY, invSize)
  				return
  			}

  			b = b.next
  		}

  		a = a.next
  	} while (a !== start)
  }

  // link every hole into the outer loop, producing a single-ring polygon without holes

  function eliminateHoles (data, holeIndices, outerNode, dim) {
  	var queue = []; var i; var len; var start; var end; var list

  	for (i = 0, len = holeIndices.length; i < len; i++) {
  		start = holeIndices[i] * dim
  		end = i < len - 1 ? holeIndices[i + 1] * dim : data.length
  		list = linkedList(data, start, end, dim, false)
  		if (list === list.next) list.steiner = true
  		queue.push(getLeftmost(list))
  	}

  	queue.sort(compareX)

  	// process holes from left to right

  	for (i = 0; i < queue.length; i++) {
  		eliminateHole(queue[i], outerNode)
  		outerNode = filterPoints(outerNode, outerNode.next)
  	}

  	return outerNode
  }

  function compareX (a, b) {
  	return a.x - b.x
  }

  // find a bridge between vertices that connects hole with an outer ring and and link it

  function eliminateHole (hole, outerNode) {
  	outerNode = findHoleBridge(hole, outerNode)

  	if (outerNode) {
  		var b = splitPolygon(outerNode, hole)

  		filterPoints(b, b.next)
  	}
  }

  // David Eberly's algorithm for finding a bridge between hole and outer polygon

  function findHoleBridge (hole, outerNode) {
  	var p = outerNode
  		var hx = hole.x
  		var hy = hole.y
  		var qx = -Infinity
  		var m

  	// find a segment intersected by a ray from the hole's leftmost point to the left;
  	// segment's endpoint with lesser x will be potential connection point

  	do {
  		if (hy <= p.y && hy >= p.next.y && p.next.y !== p.y) {
  			var x = p.x + (hy - p.y) * (p.next.x - p.x) / (p.next.y - p.y)

  			if (x <= hx && x > qx) {
  				qx = x

  				if (x === hx) {
  					if (hy === p.y) return p
  					if (hy === p.next.y) return p.next
  				}

  				m = p.x < p.next.x ? p : p.next
  			}
  		}

  		p = p.next
  	} while (p !== outerNode)

  	if (!m) return null

  	if (hx === qx) return m.prev // hole touches outer segment; pick lower endpoint

  	// look for points inside the triangle of hole point, segment intersection and endpoint;
  	// if there are no points found, we have a valid connection;
  	// otherwise choose the point of the minimum angle with the ray as connection point

  	var stop = m
  		var mx = m.x
  		var my = m.y
  		var tanMin = Infinity
  		var tan

  	p = m.next

  	while (p !== stop) {
  		if (hx >= p.x && p.x >= mx && hx !== p.x &&
  						pointInTriangle(hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y)) {
  			tan = Math.abs(hy - p.y) / (hx - p.x) // tangential

  			if ((tan < tanMin || (tan === tanMin && p.x > m.x)) && locallyInside(p, hole)) {
  				m = p
  				tanMin = tan
  			}
  		}

  		p = p.next
  	}

  	return m
  }

  // interlink polygon nodes in z-order

  function indexCurve (start, minX, minY, invSize) {
  	var p = start

  	do {
  		if (p.z === null) p.z = zOrder(p.x, p.y, minX, minY, invSize)
  		p.prevZ = p.prev
  		p.nextZ = p.next
  		p = p.next
  	} while (p !== start)

  	p.prevZ.nextZ = null
  	p.prevZ = null

  	sortLinked(p)
  }

  // Simon Tatham's linked list merge sort algorithm
  // http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html

  function sortLinked (list) {
  	var i; var p; var q; var e; var tail; var numMerges; var pSize; var qSize; var inSize = 1

  	do {
  		p = list
  		list = null
  		tail = null
  		numMerges = 0

  		while (p) {
  			numMerges++
  			q = p
  			pSize = 0

  			for (i = 0; i < inSize; i++) {
  				pSize++
  				q = q.nextZ
  				if (!q) break
  			}

  			qSize = inSize

  			while (pSize > 0 || (qSize > 0 && q)) {
  				if (pSize !== 0 && (qSize === 0 || !q || p.z <= q.z)) {
  					e = p
  					p = p.nextZ
  					pSize--
  				} else {
  					e = q
  					q = q.nextZ
  					qSize--
  				}

  				if (tail) tail.nextZ = e
  				else list = e

  				e.prevZ = tail
  				tail = e
  			}

  			p = q
  		}

  		tail.nextZ = null
  		inSize *= 2
  	} while (numMerges > 1)

  	return list
  }

  // z-order of a point given coords and inverse of the longer side of data bbox

  function zOrder (x, y, minX, minY, invSize) {
  	// coords are transformed into non-negative 15-bit integer range

  	x = 32767 * (x - minX) * invSize
  	y = 32767 * (y - minY) * invSize

  	x = (x | (x << 8)) & 0x00FF00FF
  	x = (x | (x << 4)) & 0x0F0F0F0F
  	x = (x | (x << 2)) & 0x33333333
  	x = (x | (x << 1)) & 0x55555555

  	y = (y | (y << 8)) & 0x00FF00FF
  	y = (y | (y << 4)) & 0x0F0F0F0F
  	y = (y | (y << 2)) & 0x33333333
  	y = (y | (y << 1)) & 0x55555555

  	return x | (y << 1)
  }

  // find the leftmost node of a polygon ring

  function getLeftmost (start) {
  	var p = start; var leftmost = start

  	do {
  		if (p.x < leftmost.x) leftmost = p
  		p = p.next
  	} while (p !== start)

  	return leftmost
  }

  // check if a point lies within a convex triangle

  function pointInTriangle (ax, ay, bx, by, cx, cy, px, py) {
  	return (cx - px) * (ay - py) - (ax - px) * (cy - py) >= 0 &&
  	 (ax - px) * (by - py) - (bx - px) * (ay - py) >= 0 &&
  	 (bx - px) * (cy - py) - (cx - px) * (by - py) >= 0
  }

  // check if a diagonal between two polygon nodes is valid (lies in polygon interior)

  function isValidDiagonal (a, b) {
  	return a.next.i !== b.i && a.prev.i !== b.i && !intersectsPolygon(a, b) &&
  		locallyInside(a, b) && locallyInside(b, a) && middleInside(a, b)
  }

  // signed area of a triangle

  function area (p, q, r) {
  	return (q.y - p.y) * (r.x - q.x) - (q.x - p.x) * (r.y - q.y)
  }

  // check if two points are equal

  function equals (p1, p2) {
  	return p1.x === p2.x && p1.y === p2.y
  }

  // check if two segments intersect

  function intersects (p1, q1, p2, q2) {
  	if ((equals(p1, q1) && equals(p2, q2)) ||
  			(equals(p1, q2) && equals(p2, q1))) return true

  	return area(p1, q1, p2) > 0 !== area(p1, q1, q2) > 0 &&
  				 area(p2, q2, p1) > 0 !== area(p2, q2, q1) > 0
  }

  // check if a polygon diagonal intersects any polygon segments

  function intersectsPolygon (a, b) {
  	var p = a

  	do {
  		if (p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&
  						intersects(p, p.next, a, b)) {
  			return true
  		}

  		p = p.next
  	} while (p !== a)

  	return false
  }

  // check if a polygon diagonal is locally inside the polygon

  function locallyInside (a, b) {
  	return area(a.prev, a, a.next) < 0
  		? area(a, b, a.next) >= 0 && area(a, a.prev, b) >= 0
  		: area(a, b, a.prev) < 0 || area(a, a.next, b) < 0
  }

  // check if the middle point of a polygon diagonal is inside the polygon

  function middleInside (a, b) {
  	var p = a
  		var inside = false
  		var px = (a.x + b.x) / 2
  		var py = (a.y + b.y) / 2

  	do {
  		if (((p.y > py) !== (p.next.y > py)) && p.next.y !== p.y &&
  						(px < (p.next.x - p.x) * (py - p.y) / (p.next.y - p.y) + p.x)) {
  			inside = !inside
  		}

  		p = p.next
  	} while (p !== a)

  	return inside
  }

  // link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;
  // if one belongs to the outer ring and another to a hole, it merges it into a single ring

  function splitPolygon (a, b) {
  	var a2 = new Node(a.i, a.x, a.y)
  		var b2 = new Node(b.i, b.x, b.y)
  		var an = a.next
  		var bp = b.prev

  	a.next = b
  	b.prev = a

  	a2.next = an
  	an.prev = a2

  	b2.next = a2
  	a2.prev = b2

  	bp.next = b2
  	b2.prev = bp

  	return b2
  }

  // create a node and optionally link it with previous one (in a circular doubly linked list)

  function insertNode (i, x, y, last) {
  	var p = new Node(i, x, y)

  	if (!last) {
  		p.prev = p
  		p.next = p
  	} else {
  		p.next = last.next
  		p.prev = last
  		last.next.prev = p
  		last.next = p
  	}

  	return p
  }

  function removeNode (p) {
  	p.next.prev = p.prev
  	p.prev.next = p.next

  	if (p.prevZ) p.prevZ.nextZ = p.nextZ
  	if (p.nextZ) p.nextZ.prevZ = p.prevZ
  }

  function Node (i, x, y) {
  	// vertice index in coordinates array
  	this.i = i

  	// vertex coordinates
  	this.x = x
  	this.y = y

  	// previous and next vertice nodes in a polygon ring
  	this.prev = null
  	this.next = null

  	// z-order curve value
  	this.z = null

  	// previous and next nodes in z-order
  	this.prevZ = null
  	this.nextZ = null

  	// indicates whether this is a steiner point
  	this.steiner = false
  }

  function signedArea (data, start, end, dim) {
  	var sum = 0

  	for (var i = start, j = end - dim; i < end; i += dim) {
  		sum += (data[j] - data[i]) * (data[i + 1] + data[j + 1])
  		j = i
  	}

  	return sum
  }

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   */

  var ShapeUtils = {

  	// calculate area of the contour polygon

  	area: function (contour) {
  		var n = contour.length
  		var a = 0.0

  		for (var p = n - 1, q = 0; q < n; p = q++) {
  			a += contour[p].x * contour[q].y - contour[q].x * contour[p].y
  		}

  		return a * 0.5
  	},

  	isClockWise: function (pts) {
  		return ShapeUtils.area(pts) < 0
  	},

  	triangulateShape: function (contour, holes) {
  		var vertices = [] // flat array of vertices like [ x0,y0, x1,y1, x2,y2, ... ]
  		var holeIndices = [] // array of hole indices
  		var faces = [] // final array of vertex indices like [ [ a,b,d ], [ b,c,d ] ]

  		removeDupEndPts(contour)
  		addContour(vertices, contour)

  		//

  		var holeIndex = contour.length

  		holes.forEach(removeDupEndPts)

  		for (var i = 0; i < holes.length; i++) {
  			holeIndices.push(holeIndex)
  			holeIndex += holes[i].length
  			addContour(vertices, holes[i])
  		}

  		//

  		var triangles = Earcut.triangulate(vertices, holeIndices)

  		//

  		for (var i = 0; i < triangles.length; i += 3) {
  			faces.push(triangles.slice(i, i + 3))
  		}

  		return faces
  	}

  }

  function removeDupEndPts (points) {
  	var l = points.length

  	if (l > 2 && points[l - 1].equals(points[0])) {
  		points.pop()
  	}
  }

  function addContour (vertices, contour) {
  	for (var i = 0; i < contour.length; i++) {
  		vertices.push(contour[i].x)
  		vertices.push(contour[i].y)
  	}
  }

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   *
   * Creates extruded geometry from a path shape.
   *
   * parameters = {
   *
   *  curveSegments: <int>, // number of points on the curves
   *  steps: <int>, // number of points for z-side extrusions / used for subdividing segments of extrude spline too
   *  depth: <float>, // Depth to extrude the shape
   *
   *  bevelEnabled: <bool>, // turn on bevel
   *  bevelThickness: <float>, // how deep into the original shape bevel goes
   *  bevelSize: <float>, // how far from shape outline is bevel
   *  bevelSegments: <int>, // number of bevel layers
   *
   *  extrudePath: <THREE.Curve> // curve to extrude shape along
   *
   *  UVGenerator: <Object> // object that provides UV generator functions
   *
   * }
   */

  // ExtrudeGeometry

  function ExtrudeGeometry (shapes, options) {
  	Geometry.call(this)

  	this.type = 'ExtrudeGeometry'

  	this.parameters = {
  		shapes: shapes,
  		options: options
  	}

  	this.fromBufferGeometry(new ExtrudeBufferGeometry(shapes, options))
  	this.mergeVertices()
  }

  ExtrudeGeometry.prototype = Object.create(Geometry.prototype)
  ExtrudeGeometry.prototype.constructor = ExtrudeGeometry

  ExtrudeGeometry.prototype.toJSON = function () {
  	var data = Geometry.prototype.toJSON.call(this)

  	var shapes = this.parameters.shapes
  	var options = this.parameters.options

  	return toJSON(shapes, options, data)
  }

  // ExtrudeBufferGeometry

  function ExtrudeBufferGeometry (shapes, options) {
  	BufferGeometry.call(this)

  	this.type = 'ExtrudeBufferGeometry'

  	this.parameters = {
  		shapes: shapes,
  		options: options
  	}

  	shapes = Array.isArray(shapes) ? shapes : [shapes]

  	var scope = this

  	var verticesArray = []
  	var uvArray = []

  	for (var i = 0, l = shapes.length; i < l; i++) {
  		var shape = shapes[i]
  		addShape(shape)
  	}

  	// build geometry

  	this.addAttribute('position', new Float32BufferAttribute(verticesArray, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvArray, 2))

  	this.computeVertexNormals()

  	// functions

  	function addShape (shape) {
  		var placeholder = []

  		// options

  		var curveSegments = options.curveSegments !== undefined ? options.curveSegments : 12
  		var steps = options.steps !== undefined ? options.steps : 1
  		var depth = options.depth !== undefined ? options.depth : 100

  		var bevelEnabled = options.bevelEnabled !== undefined ? options.bevelEnabled : true
  		var bevelThickness = options.bevelThickness !== undefined ? options.bevelThickness : 6
  		var bevelSize = options.bevelSize !== undefined ? options.bevelSize : bevelThickness - 2
  		var bevelSegments = options.bevelSegments !== undefined ? options.bevelSegments : 3

  		var extrudePath = options.extrudePath

  		var uvgen = options.UVGenerator !== undefined ? options.UVGenerator : WorldUVGenerator

  		// deprecated options

  		if (options.amount !== undefined) {
  			console.warn('THREE.ExtrudeBufferGeometry: amount has been renamed to depth.')
  			depth = options.amount
  		}

  		//

  		var extrudePts; var extrudeByPath = false
  		var splineTube, binormal, normal, position2

  		if (extrudePath) {
  			extrudePts = extrudePath.getSpacedPoints(steps)

  			extrudeByPath = true
  			bevelEnabled = false // bevels not supported for path extrusion

  			// SETUP TNB variables

  			// TODO1 - have a .isClosed in spline?

  			splineTube = extrudePath.computeFrenetFrames(steps, false)

  			// console.log(splineTube, 'splineTube', splineTube.normals.length, 'steps', steps, 'extrudePts', extrudePts.length);

  			binormal = new Vector3()
  			normal = new Vector3()
  			position2 = new Vector3()
  		}

  		// Safeguards if bevels are not enabled

  		if (!bevelEnabled) {
  			bevelSegments = 0
  			bevelThickness = 0
  			bevelSize = 0
  		}

  		// Variables initialization

  		var ahole, h, hl // looping of holes

  		var shapePoints = shape.extractPoints(curveSegments)

  		var vertices = shapePoints.shape
  		var holes = shapePoints.holes

  		var reverse = !ShapeUtils.isClockWise(vertices)

  		if (reverse) {
  			vertices = vertices.reverse()

  			// Maybe we should also check if holes are in the opposite direction, just to be safe ...

  			for (h = 0, hl = holes.length; h < hl; h++) {
  				ahole = holes[h]

  				if (ShapeUtils.isClockWise(ahole)) {
  					holes[h] = ahole.reverse()
  				}
  			}
  		}

  		var faces = ShapeUtils.triangulateShape(vertices, holes)

  		/* Vertices */

  		var contour = vertices // vertices has all points but contour has only points of circumference

  		for (h = 0, hl = holes.length; h < hl; h++) {
  			ahole = holes[h]

  			vertices = vertices.concat(ahole)
  		}

  		function scalePt2 (pt, vec, size) {
  			if (!vec) console.error('THREE.ExtrudeGeometry: vec does not exist')

  			return vec.clone().multiplyScalar(size).add(pt)
  		}

  		var b; var bs; var t; var z
  			var vert; var vlen = vertices.length
  			var face; var flen = faces.length

  		// Find directions for point movement

  		function getBevelVec (inPt, inPrev, inNext) {
  			// computes for inPt the corresponding point inPt' on a new contour
  			//   shifted by 1 unit (length of normalized vector) to the left
  			// if we walk along contour clockwise, this new contour is outside the old one
  			//
  			// inPt' is the intersection of the two lines parallel to the two
  			//  adjacent edges of inPt at a distance of 1 unit on the left side.

  			var v_trans_x, v_trans_y, shrink_by // resulting translation vector for inPt

  			// good reading for geometry algorithms (here: line-line intersection)
  			// http://geomalgorithms.com/a05-_intersect-1.html

  			var v_prev_x = inPt.x - inPrev.x
  				var v_prev_y = inPt.y - inPrev.y
  			var v_next_x = inNext.x - inPt.x
  				var v_next_y = inNext.y - inPt.y

  			var v_prev_lensq = (v_prev_x * v_prev_x + v_prev_y * v_prev_y)

  			// check for collinear edges
  			var collinear0 = (v_prev_x * v_next_y - v_prev_y * v_next_x)

  			if (Math.abs(collinear0) > Number.EPSILON) {
  				// not collinear

  				// length of vectors for normalizing

  				var v_prev_len = Math.sqrt(v_prev_lensq)
  				var v_next_len = Math.sqrt(v_next_x * v_next_x + v_next_y * v_next_y)

  				// shift adjacent points by unit vectors to the left

  				var ptPrevShift_x = (inPrev.x - v_prev_y / v_prev_len)
  				var ptPrevShift_y = (inPrev.y + v_prev_x / v_prev_len)

  				var ptNextShift_x = (inNext.x - v_next_y / v_next_len)
  				var ptNextShift_y = (inNext.y + v_next_x / v_next_len)

  				// scaling factor for v_prev to intersection point

  				var sf = ((ptNextShift_x - ptPrevShift_x) * v_next_y -
  						(ptNextShift_y - ptPrevShift_y) * v_next_x) /
  					(v_prev_x * v_next_y - v_prev_y * v_next_x)

  				// vector from inPt to intersection point

  				v_trans_x = (ptPrevShift_x + v_prev_x * sf - inPt.x)
  				v_trans_y = (ptPrevShift_y + v_prev_y * sf - inPt.y)

  				// Don't normalize!, otherwise sharp corners become ugly
  				//  but prevent crazy spikes
  				var v_trans_lensq = (v_trans_x * v_trans_x + v_trans_y * v_trans_y)
  				if (v_trans_lensq <= 2) {
  					return new Vector2(v_trans_x, v_trans_y)
  				} else {
  					shrink_by = Math.sqrt(v_trans_lensq / 2)
  				}
  			} else {
  				// handle special case of collinear edges

  				var direction_eq = false // assumes: opposite
  				if (v_prev_x > Number.EPSILON) {
  					if (v_next_x > Number.EPSILON) {
  						direction_eq = true
  					}
  				} else {
  					if (v_prev_x < -Number.EPSILON) {
  						if (v_next_x < -Number.EPSILON) {
  							direction_eq = true
  						}
  					} else {
  						if (Math.sign(v_prev_y) === Math.sign(v_next_y)) {
  							direction_eq = true
  						}
  					}
  				}

  				if (direction_eq) {
  					// console.log("Warning: lines are a straight sequence");
  					v_trans_x = -v_prev_y
  					v_trans_y = v_prev_x
  					shrink_by = Math.sqrt(v_prev_lensq)
  				} else {
  					// console.log("Warning: lines are a straight spike");
  					v_trans_x = v_prev_x
  					v_trans_y = v_prev_y
  					shrink_by = Math.sqrt(v_prev_lensq / 2)
  				}
  			}

  			return new Vector2(v_trans_x / shrink_by, v_trans_y / shrink_by)
  		}

  		var contourMovements = []

  		for (var i = 0, il = contour.length, j = il - 1, k = i + 1; i < il; i++, j++, k++) {
  			if (j === il) j = 0
  			if (k === il) k = 0

  			//  (j)---(i)---(k)
  			// console.log('i,j,k', i, j , k)

  			contourMovements[i] = getBevelVec(contour[i], contour[j], contour[k])
  		}

  		var holesMovements = []
  			var oneHoleMovements; var verticesMovements = contourMovements.concat()

  		for (h = 0, hl = holes.length; h < hl; h++) {
  			ahole = holes[h]

  			oneHoleMovements = []

  			for (i = 0, il = ahole.length, j = il - 1, k = i + 1; i < il; i++, j++, k++) {
  				if (j === il) j = 0
  				if (k === il) k = 0

  				//  (j)---(i)---(k)
  				oneHoleMovements[i] = getBevelVec(ahole[i], ahole[j], ahole[k])
  			}

  			holesMovements.push(oneHoleMovements)
  			verticesMovements = verticesMovements.concat(oneHoleMovements)
  		}

  		// Loop bevelSegments, 1 for the front, 1 for the back

  		for (b = 0; b < bevelSegments; b++) {
  			// for ( b = bevelSegments; b > 0; b -- ) {

  			t = b / bevelSegments
  			z = bevelThickness * Math.cos(t * Math.PI / 2)
  			bs = bevelSize * Math.sin(t * Math.PI / 2)

  			// contract shape

  			for (i = 0, il = contour.length; i < il; i++) {
  				vert = scalePt2(contour[i], contourMovements[i], bs)

  				v(vert.x, vert.y, -z)
  			}

  			// expand holes

  			for (h = 0, hl = holes.length; h < hl; h++) {
  				ahole = holes[h]
  				oneHoleMovements = holesMovements[h]

  				for (i = 0, il = ahole.length; i < il; i++) {
  					vert = scalePt2(ahole[i], oneHoleMovements[i], bs)

  					v(vert.x, vert.y, -z)
  				}
  			}
  		}

  		bs = bevelSize

  		// Back facing vertices

  		for (i = 0; i < vlen; i++) {
  			vert = bevelEnabled ? scalePt2(vertices[i], verticesMovements[i], bs) : vertices[i]

  			if (!extrudeByPath) {
  				v(vert.x, vert.y, 0)
  			} else {
  				// v( vert.x, vert.y + extrudePts[ 0 ].y, extrudePts[ 0 ].x );

  				normal.copy(splineTube.normals[0]).multiplyScalar(vert.x)
  				binormal.copy(splineTube.binormals[0]).multiplyScalar(vert.y)

  				position2.copy(extrudePts[0]).add(normal).add(binormal)

  				v(position2.x, position2.y, position2.z)
  			}
  		}

  		// Add stepped vertices...
  		// Including front facing vertices

  		var s

  		for (s = 1; s <= steps; s++) {
  			for (i = 0; i < vlen; i++) {
  				vert = bevelEnabled ? scalePt2(vertices[i], verticesMovements[i], bs) : vertices[i]

  				if (!extrudeByPath) {
  					v(vert.x, vert.y, depth / steps * s)
  				} else {
  					// v( vert.x, vert.y + extrudePts[ s - 1 ].y, extrudePts[ s - 1 ].x );

  					normal.copy(splineTube.normals[s]).multiplyScalar(vert.x)
  					binormal.copy(splineTube.binormals[s]).multiplyScalar(vert.y)

  					position2.copy(extrudePts[s]).add(normal).add(binormal)

  					v(position2.x, position2.y, position2.z)
  				}
  			}
  		}

  		// Add bevel segments planes

  		// for ( b = 1; b <= bevelSegments; b ++ ) {
  		for (b = bevelSegments - 1; b >= 0; b--) {
  			t = b / bevelSegments
  			z = bevelThickness * Math.cos(t * Math.PI / 2)
  			bs = bevelSize * Math.sin(t * Math.PI / 2)

  			// contract shape

  			for (i = 0, il = contour.length; i < il; i++) {
  				vert = scalePt2(contour[i], contourMovements[i], bs)
  				v(vert.x, vert.y, depth + z)
  			}

  			// expand holes

  			for (h = 0, hl = holes.length; h < hl; h++) {
  				ahole = holes[h]
  				oneHoleMovements = holesMovements[h]

  				for (i = 0, il = ahole.length; i < il; i++) {
  					vert = scalePt2(ahole[i], oneHoleMovements[i], bs)

  					if (!extrudeByPath) {
  						v(vert.x, vert.y, depth + z)
  					} else {
  						v(vert.x, vert.y + extrudePts[steps - 1].y, extrudePts[steps - 1].x + z)
  					}
  				}
  			}
  		}

  		/* Faces */

  		// Top and bottom faces

  		buildLidFaces()

  		// Sides faces

  		buildSideFaces()

  		/// //  Internal functions

  		function buildLidFaces () {
  			var start = verticesArray.length / 3

  			if (bevelEnabled) {
  				var layer = 0 // steps + 1
  				var offset = vlen * layer

  				// Bottom faces

  				for (i = 0; i < flen; i++) {
  					face = faces[i]
  					f3(face[2] + offset, face[1] + offset, face[0] + offset)
  				}

  				layer = steps + bevelSegments * 2
  				offset = vlen * layer

  				// Top faces

  				for (i = 0; i < flen; i++) {
  					face = faces[i]
  					f3(face[0] + offset, face[1] + offset, face[2] + offset)
  				}
  			} else {
  				// Bottom faces

  				for (i = 0; i < flen; i++) {
  					face = faces[i]
  					f3(face[2], face[1], face[0])
  				}

  				// Top faces

  				for (i = 0; i < flen; i++) {
  					face = faces[i]
  					f3(face[0] + vlen * steps, face[1] + vlen * steps, face[2] + vlen * steps)
  				}
  			}

  			scope.addGroup(start, verticesArray.length / 3 - start, 0)
  		}

  		// Create faces for the z-sides of the shape

  		function buildSideFaces () {
  			var start = verticesArray.length / 3
  			var layeroffset = 0
  			sidewalls(contour, layeroffset)
  			layeroffset += contour.length

  			for (h = 0, hl = holes.length; h < hl; h++) {
  				ahole = holes[h]
  				sidewalls(ahole, layeroffset)

  				//, true
  				layeroffset += ahole.length
  			}

  			scope.addGroup(start, verticesArray.length / 3 - start, 1)
  		}

  		function sidewalls (contour, layeroffset) {
  			var j, k
  			i = contour.length

  			while (--i >= 0) {
  				j = i
  				k = i - 1
  				if (k < 0) k = contour.length - 1

  				// console.log('b', i,j, i-1, k,vertices.length);

  				var s = 0
  					var sl = steps + bevelSegments * 2

  				for (s = 0; s < sl; s++) {
  					var slen1 = vlen * s
  					var slen2 = vlen * (s + 1)

  					var a = layeroffset + j + slen1
  						var b = layeroffset + k + slen1
  						var c = layeroffset + k + slen2
  						var d = layeroffset + j + slen2

  					f4(a, b, c, d)
  				}
  			}
  		}

  		function v (x, y, z) {
  			placeholder.push(x)
  			placeholder.push(y)
  			placeholder.push(z)
  		}

  		function f3 (a, b, c) {
  			addVertex(a)
  			addVertex(b)
  			addVertex(c)

  			var nextIndex = verticesArray.length / 3
  			var uvs = uvgen.generateTopUV(scope, verticesArray, nextIndex - 3, nextIndex - 2, nextIndex - 1)

  			addUV(uvs[0])
  			addUV(uvs[1])
  			addUV(uvs[2])
  		}

  		function f4 (a, b, c, d) {
  			addVertex(a)
  			addVertex(b)
  			addVertex(d)

  			addVertex(b)
  			addVertex(c)
  			addVertex(d)

  			var nextIndex = verticesArray.length / 3
  			var uvs = uvgen.generateSideWallUV(scope, verticesArray, nextIndex - 6, nextIndex - 3, nextIndex - 2, nextIndex - 1)

  			addUV(uvs[0])
  			addUV(uvs[1])
  			addUV(uvs[3])

  			addUV(uvs[1])
  			addUV(uvs[2])
  			addUV(uvs[3])
  		}

  		function addVertex (index) {
  			verticesArray.push(placeholder[index * 3 + 0])
  			verticesArray.push(placeholder[index * 3 + 1])
  			verticesArray.push(placeholder[index * 3 + 2])
  		}

  		function addUV (vector2) {
  			uvArray.push(vector2.x)
  			uvArray.push(vector2.y)
  		}
  	}
  }

  ExtrudeBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  ExtrudeBufferGeometry.prototype.constructor = ExtrudeBufferGeometry

  ExtrudeBufferGeometry.prototype.toJSON = function () {
  	var data = BufferGeometry.prototype.toJSON.call(this)

  	var shapes = this.parameters.shapes
  	var options = this.parameters.options

  	return toJSON(shapes, options, data)
  }

  //

  var WorldUVGenerator = {

  	generateTopUV: function (geometry, vertices, indexA, indexB, indexC) {
  		var a_x = vertices[indexA * 3]
  		var a_y = vertices[indexA * 3 + 1]
  		var b_x = vertices[indexB * 3]
  		var b_y = vertices[indexB * 3 + 1]
  		var c_x = vertices[indexC * 3]
  		var c_y = vertices[indexC * 3 + 1]

  		return [
  			new Vector2(a_x, a_y),
  			new Vector2(b_x, b_y),
  			new Vector2(c_x, c_y)
  		]
  	},

  	generateSideWallUV: function (geometry, vertices, indexA, indexB, indexC, indexD) {
  		var a_x = vertices[indexA * 3]
  		var a_y = vertices[indexA * 3 + 1]
  		var a_z = vertices[indexA * 3 + 2]
  		var b_x = vertices[indexB * 3]
  		var b_y = vertices[indexB * 3 + 1]
  		var b_z = vertices[indexB * 3 + 2]
  		var c_x = vertices[indexC * 3]
  		var c_y = vertices[indexC * 3 + 1]
  		var c_z = vertices[indexC * 3 + 2]
  		var d_x = vertices[indexD * 3]
  		var d_y = vertices[indexD * 3 + 1]
  		var d_z = vertices[indexD * 3 + 2]

  		if (Math.abs(a_y - b_y) < 0.01) {
  			return [
  				new Vector2(a_x, 1 - a_z),
  				new Vector2(b_x, 1 - b_z),
  				new Vector2(c_x, 1 - c_z),
  				new Vector2(d_x, 1 - d_z)
  			]
  		} else {
  			return [
  				new Vector2(a_y, 1 - a_z),
  				new Vector2(b_y, 1 - b_z),
  				new Vector2(c_y, 1 - c_z),
  				new Vector2(d_y, 1 - d_z)
  			]
  		}
  	}
  }

  function toJSON (shapes, options, data) {
  	//

  	data.shapes = []

  	if (Array.isArray(shapes)) {
  		for (var i = 0, l = shapes.length; i < l; i++) {
  			var shape = shapes[i]

  			data.shapes.push(shape.uuid)
  		}
  	} else {
  		data.shapes.push(shapes.uuid)
  	}

  	//

  	if (options.extrudePath !== undefined) data.options.extrudePath = options.extrudePath.toJSON()

  	return data
  }

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   * @author alteredq / http://alteredqualia.com/
   *
   * Text = 3D Text
   *
   * parameters = {
   *  font: <THREE.Font>, // font
   *
   *  size: <float>, // size of the text
   *  height: <float>, // thickness to extrude text
   *  curveSegments: <int>, // number of points on the curves
   *
   *  bevelEnabled: <bool>, // turn on bevel
   *  bevelThickness: <float>, // how deep into text bevel goes
   *  bevelSize: <float> // how far from text outline is bevel
   * }
   */

  // TextGeometry

  function TextGeometry (text, parameters) {
  	Geometry.call(this)

  	this.type = 'TextGeometry'

  	this.parameters = {
  		text: text,
  		parameters: parameters
  	}

  	this.fromBufferGeometry(new TextBufferGeometry(text, parameters))
  	this.mergeVertices()
  }

  TextGeometry.prototype = Object.create(Geometry.prototype)
  TextGeometry.prototype.constructor = TextGeometry

  // TextBufferGeometry

  function TextBufferGeometry (text, parameters) {
  	parameters = parameters || {}

  	var font = parameters.font

  	if (!(font && font.isFont)) {
  		console.error('THREE.TextGeometry: font parameter is not an instance of THREE.Font.')
  		return new Geometry()
  	}

  	var shapes = font.generateShapes(text, parameters.size, parameters.curveSegments)

  	// translate parameters to ExtrudeGeometry API

  	parameters.depth = parameters.height !== undefined ? parameters.height : 50

  	// defaults

  	if (parameters.bevelThickness === undefined) parameters.bevelThickness = 10
  	if (parameters.bevelSize === undefined) parameters.bevelSize = 8
  	if (parameters.bevelEnabled === undefined) parameters.bevelEnabled = false

  	ExtrudeBufferGeometry.call(this, shapes, parameters)

  	this.type = 'TextBufferGeometry'
  }

  TextBufferGeometry.prototype = Object.create(ExtrudeBufferGeometry.prototype)
  TextBufferGeometry.prototype.constructor = TextBufferGeometry

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author benaadams / https://twitter.com/ben_a_adams
   * @author Mugen87 / https://github.com/Mugen87
   */

  // SphereGeometry

  function SphereGeometry (radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength) {
  	Geometry.call(this)

  	this.type = 'SphereGeometry'

  	this.parameters = {
  		radius: radius,
  		widthSegments: widthSegments,
  		heightSegments: heightSegments,
  		phiStart: phiStart,
  		phiLength: phiLength,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}

  	this.fromBufferGeometry(new SphereBufferGeometry(radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength))
  	this.mergeVertices()
  }

  SphereGeometry.prototype = Object.create(Geometry.prototype)
  SphereGeometry.prototype.constructor = SphereGeometry

  // SphereBufferGeometry

  function SphereBufferGeometry (radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength) {
  	BufferGeometry.call(this)

  	this.type = 'SphereBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		widthSegments: widthSegments,
  		heightSegments: heightSegments,
  		phiStart: phiStart,
  		phiLength: phiLength,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}

  	radius = radius || 1

  	widthSegments = Math.max(3, Math.floor(widthSegments) || 8)
  	heightSegments = Math.max(2, Math.floor(heightSegments) || 6)

  	phiStart = phiStart !== undefined ? phiStart : 0
  	phiLength = phiLength !== undefined ? phiLength : Math.PI * 2

  	thetaStart = thetaStart !== undefined ? thetaStart : 0
  	thetaLength = thetaLength !== undefined ? thetaLength : Math.PI

  	var thetaEnd = thetaStart + thetaLength

  	var ix, iy

  	var index = 0
  	var grid = []

  	var vertex = new Vector3()
  	var normal = new Vector3()

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// generate vertices, normals and uvs

  	for (iy = 0; iy <= heightSegments; iy++) {
  		var verticesRow = []

  		var v = iy / heightSegments

  		for (ix = 0; ix <= widthSegments; ix++) {
  			var u = ix / widthSegments

  			// vertex

  			vertex.x = -radius * Math.cos(phiStart + u * phiLength) * Math.sin(thetaStart + v * thetaLength)
  			vertex.y = radius * Math.cos(thetaStart + v * thetaLength)
  			vertex.z = radius * Math.sin(phiStart + u * phiLength) * Math.sin(thetaStart + v * thetaLength)

  			vertices.push(vertex.x, vertex.y, vertex.z)

  			// normal

  			normal.set(vertex.x, vertex.y, vertex.z).normalize()
  			normals.push(normal.x, normal.y, normal.z)

  			// uv

  			uvs.push(u, 1 - v)

  			verticesRow.push(index++)
  		}

  		grid.push(verticesRow)
  	}

  	// indices

  	for (iy = 0; iy < heightSegments; iy++) {
  		for (ix = 0; ix < widthSegments; ix++) {
  			var a = grid[iy][ix + 1]
  			var b = grid[iy][ix]
  			var c = grid[iy + 1][ix]
  			var d = grid[iy + 1][ix + 1]

  			if (iy !== 0 || thetaStart > 0) indices.push(a, b, d)
  			if (iy !== heightSegments - 1 || thetaEnd < Math.PI) indices.push(b, c, d)
  		}
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))
  }

  SphereBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  SphereBufferGeometry.prototype.constructor = SphereBufferGeometry

  /**
   * @author Kaleb Murphy
   * @author Mugen87 / https://github.com/Mugen87
   */

  // RingGeometry

  function RingGeometry (innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength) {
  	Geometry.call(this)

  	this.type = 'RingGeometry'

  	this.parameters = {
  		innerRadius: innerRadius,
  		outerRadius: outerRadius,
  		thetaSegments: thetaSegments,
  		phiSegments: phiSegments,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}

  	this.fromBufferGeometry(new RingBufferGeometry(innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength))
  	this.mergeVertices()
  }

  RingGeometry.prototype = Object.create(Geometry.prototype)
  RingGeometry.prototype.constructor = RingGeometry

  // RingBufferGeometry

  function RingBufferGeometry (innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength) {
  	BufferGeometry.call(this)

  	this.type = 'RingBufferGeometry'

  	this.parameters = {
  		innerRadius: innerRadius,
  		outerRadius: outerRadius,
  		thetaSegments: thetaSegments,
  		phiSegments: phiSegments,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}

  	innerRadius = innerRadius || 0.5
  	outerRadius = outerRadius || 1

  	thetaStart = thetaStart !== undefined ? thetaStart : 0
  	thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2

  	thetaSegments = thetaSegments !== undefined ? Math.max(3, thetaSegments) : 8
  	phiSegments = phiSegments !== undefined ? Math.max(1, phiSegments) : 1

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// some helper variables

  	var segment
  	var radius = innerRadius
  	var radiusStep = ((outerRadius - innerRadius) / phiSegments)
  	var vertex = new Vector3()
  	var uv = new Vector2()
  	var j, i

  	// generate vertices, normals and uvs

  	for (j = 0; j <= phiSegments; j++) {
  		for (i = 0; i <= thetaSegments; i++) {
  			// values are generate from the inside of the ring to the outside

  			segment = thetaStart + i / thetaSegments * thetaLength

  			// vertex

  			vertex.x = radius * Math.cos(segment)
  			vertex.y = radius * Math.sin(segment)

  			vertices.push(vertex.x, vertex.y, vertex.z)

  			// normal

  			normals.push(0, 0, 1)

  			// uv

  			uv.x = (vertex.x / outerRadius + 1) / 2
  			uv.y = (vertex.y / outerRadius + 1) / 2

  			uvs.push(uv.x, uv.y)
  		}

  		// increase the radius for next row of vertices

  		radius += radiusStep
  	}

  	// indices

  	for (j = 0; j < phiSegments; j++) {
  		var thetaSegmentLevel = j * (thetaSegments + 1)

  		for (i = 0; i < thetaSegments; i++) {
  			segment = i + thetaSegmentLevel

  			var a = segment
  			var b = segment + thetaSegments + 1
  			var c = segment + thetaSegments + 2
  			var d = segment + 1

  			// faces

  			indices.push(a, b, d)
  			indices.push(b, c, d)
  		}
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))
  }

  RingBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  RingBufferGeometry.prototype.constructor = RingBufferGeometry

  /**
   * @author astrodud / http://astrodud.isgreat.org/
   * @author zz85 / https://github.com/zz85
   * @author bhouston / http://clara.io
   * @author Mugen87 / https://github.com/Mugen87
   */

  // LatheGeometry

  function LatheGeometry (points, segments, phiStart, phiLength) {
  	Geometry.call(this)

  	this.type = 'LatheGeometry'

  	this.parameters = {
  		points: points,
  		segments: segments,
  		phiStart: phiStart,
  		phiLength: phiLength
  	}

  	this.fromBufferGeometry(new LatheBufferGeometry(points, segments, phiStart, phiLength))
  	this.mergeVertices()
  }

  LatheGeometry.prototype = Object.create(Geometry.prototype)
  LatheGeometry.prototype.constructor = LatheGeometry

  // LatheBufferGeometry

  function LatheBufferGeometry (points, segments, phiStart, phiLength) {
  	BufferGeometry.call(this)

  	this.type = 'LatheBufferGeometry'

  	this.parameters = {
  		points: points,
  		segments: segments,
  		phiStart: phiStart,
  		phiLength: phiLength
  	}

  	segments = Math.floor(segments) || 12
  	phiStart = phiStart || 0
  	phiLength = phiLength || Math.PI * 2

  	// clamp phiLength so it's in range of [ 0, 2PI ]

  	phiLength = _Math.clamp(phiLength, 0, Math.PI * 2)

  	// buffers

  	var indices = []
  	var vertices = []
  	var uvs = []

  	// helper variables

  	var base
  	var inverseSegments = 1.0 / segments
  	var vertex = new Vector3()
  	var uv = new Vector2()
  	var i, j

  	// generate vertices and uvs

  	for (i = 0; i <= segments; i++) {
  		var phi = phiStart + i * inverseSegments * phiLength

  		var sin = Math.sin(phi)
  		var cos = Math.cos(phi)

  		for (j = 0; j <= (points.length - 1); j++) {
  			// vertex

  			vertex.x = points[j].x * sin
  			vertex.y = points[j].y
  			vertex.z = points[j].x * cos

  			vertices.push(vertex.x, vertex.y, vertex.z)

  			// uv

  			uv.x = i / segments
  			uv.y = j / (points.length - 1)

  			uvs.push(uv.x, uv.y)
  		}
  	}

  	// indices

  	for (i = 0; i < segments; i++) {
  		for (j = 0; j < (points.length - 1); j++) {
  			base = j + i * points.length

  			var a = base
  			var b = base + points.length
  			var c = base + points.length + 1
  			var d = base + 1

  			// faces

  			indices.push(a, b, d)
  			indices.push(b, c, d)
  		}
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))

  	// generate normals

  	this.computeVertexNormals()

  	// if the geometry is closed, we need to average the normals along the seam.
  	// because the corresponding vertices are identical (but still have different UVs).

  	if (phiLength === Math.PI * 2) {
  		var normals = this.attributes.normal.array
  		var n1 = new Vector3()
  		var n2 = new Vector3()
  		var n = new Vector3()

  		// this is the buffer offset for the last line of vertices

  		base = segments * points.length * 3

  		for (i = 0, j = 0; i < points.length; i++, j += 3) {
  			// select the normal of the vertex in the first line

  			n1.x = normals[j + 0]
  			n1.y = normals[j + 1]
  			n1.z = normals[j + 2]

  			// select the normal of the vertex in the last line

  			n2.x = normals[base + j + 0]
  			n2.y = normals[base + j + 1]
  			n2.z = normals[base + j + 2]

  			// average normals

  			n.addVectors(n1, n2).normalize()

  			// assign the new values to both normals

  			normals[j + 0] = normals[base + j + 0] = n.x
  			normals[j + 1] = normals[base + j + 1] = n.y
  			normals[j + 2] = normals[base + j + 2] = n.z
  		}
  	}
  }

  LatheBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  LatheBufferGeometry.prototype.constructor = LatheBufferGeometry

  /**
   * @author jonobr1 / http://jonobr1.com
   * @author Mugen87 / https://github.com/Mugen87
   */

  // ShapeGeometry

  function ShapeGeometry (shapes, curveSegments) {
  	Geometry.call(this)

  	this.type = 'ShapeGeometry'

  	if (typeof curveSegments === 'object') {
  		console.warn('THREE.ShapeGeometry: Options parameter has been removed.')

  		curveSegments = curveSegments.curveSegments
  	}

  	this.parameters = {
  		shapes: shapes,
  		curveSegments: curveSegments
  	}

  	this.fromBufferGeometry(new ShapeBufferGeometry(shapes, curveSegments))
  	this.mergeVertices()
  }

  ShapeGeometry.prototype = Object.create(Geometry.prototype)
  ShapeGeometry.prototype.constructor = ShapeGeometry

  ShapeGeometry.prototype.toJSON = function () {
  	var data = Geometry.prototype.toJSON.call(this)

  	var shapes = this.parameters.shapes

  	return toJSON$1(shapes, data)
  }

  // ShapeBufferGeometry

  function ShapeBufferGeometry (shapes, curveSegments) {
  	BufferGeometry.call(this)

  	this.type = 'ShapeBufferGeometry'

  	this.parameters = {
  		shapes: shapes,
  		curveSegments: curveSegments
  	}

  	curveSegments = curveSegments || 12

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// helper variables

  	var groupStart = 0
  	var groupCount = 0

  	// allow single and array values for "shapes" parameter

  	if (Array.isArray(shapes) === false) {
  		addShape(shapes)
  	} else {
  		for (var i = 0; i < shapes.length; i++) {
  			addShape(shapes[i])

  			this.addGroup(groupStart, groupCount, i) // enables MultiMaterial support

  			groupStart += groupCount
  			groupCount = 0
  		}
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))

  	// helper functions

  	function addShape (shape) {
  		var i, l, shapeHole

  		var indexOffset = vertices.length / 3
  		var points = shape.extractPoints(curveSegments)

  		var shapeVertices = points.shape
  		var shapeHoles = points.holes

  		// check direction of vertices

  		if (ShapeUtils.isClockWise(shapeVertices) === false) {
  			shapeVertices = shapeVertices.reverse()

  			// also check if holes are in the opposite direction

  			for (i = 0, l = shapeHoles.length; i < l; i++) {
  				shapeHole = shapeHoles[i]

  				if (ShapeUtils.isClockWise(shapeHole) === true) {
  					shapeHoles[i] = shapeHole.reverse()
  				}
  			}
  		}

  		var faces = ShapeUtils.triangulateShape(shapeVertices, shapeHoles)

  		// join vertices of inner and outer paths to a single array

  		for (i = 0, l = shapeHoles.length; i < l; i++) {
  			shapeHole = shapeHoles[i]
  			shapeVertices = shapeVertices.concat(shapeHole)
  		}

  		// vertices, normals, uvs

  		for (i = 0, l = shapeVertices.length; i < l; i++) {
  			var vertex = shapeVertices[i]

  			vertices.push(vertex.x, vertex.y, 0)
  			normals.push(0, 0, 1)
  			uvs.push(vertex.x, vertex.y) // world uvs
  		}

  		// incides

  		for (i = 0, l = faces.length; i < l; i++) {
  			var face = faces[i]

  			var a = face[0] + indexOffset
  			var b = face[1] + indexOffset
  			var c = face[2] + indexOffset

  			indices.push(a, b, c)
  			groupCount += 3
  		}
  	}
  }

  ShapeBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  ShapeBufferGeometry.prototype.constructor = ShapeBufferGeometry

  ShapeBufferGeometry.prototype.toJSON = function () {
  	var data = BufferGeometry.prototype.toJSON.call(this)

  	var shapes = this.parameters.shapes

  	return toJSON$1(shapes, data)
  }

  //

  function toJSON$1 (shapes, data) {
  	data.shapes = []

  	if (Array.isArray(shapes)) {
  		for (var i = 0, l = shapes.length; i < l; i++) {
  			var shape = shapes[i]

  			data.shapes.push(shape.uuid)
  		}
  	} else {
  		data.shapes.push(shapes.uuid)
  	}

  	return data
  }

  /**
   * @author WestLangley / http://github.com/WestLangley
   * @author Mugen87 / https://github.com/Mugen87
   */

  function EdgesGeometry (geometry, thresholdAngle) {
  	BufferGeometry.call(this)

  	this.type = 'EdgesGeometry'

  	this.parameters = {
  		thresholdAngle: thresholdAngle
  	}

  	thresholdAngle = (thresholdAngle !== undefined) ? thresholdAngle : 1

  	// buffer

  	var vertices = []

  	// helper variables

  	var thresholdDot = Math.cos(_Math.DEG2RAD * thresholdAngle)
  	var edge = [0, 0]; var edges = {}; var edge1; var edge2
  	var key; var keys = ['a', 'b', 'c']

  	// prepare source geometry

  	var geometry2

  	if (geometry.isBufferGeometry) {
  		geometry2 = new Geometry()
  		geometry2.fromBufferGeometry(geometry)
  	} else {
  		geometry2 = geometry.clone()
  	}

  	geometry2.mergeVertices()
  	geometry2.computeFaceNormals()

  	var sourceVertices = geometry2.vertices
  	var faces = geometry2.faces

  	// now create a data structure where each entry represents an edge with its adjoining faces

  	for (var i = 0, l = faces.length; i < l; i++) {
  		var face = faces[i]

  		for (var j = 0; j < 3; j++) {
  			edge1 = face[keys[j]]
  			edge2 = face[keys[(j + 1) % 3]]
  			edge[0] = Math.min(edge1, edge2)
  			edge[1] = Math.max(edge1, edge2)

  			key = edge[0] + ',' + edge[1]

  			if (edges[key] === undefined) {
  				edges[key] = { index1: edge[0], index2: edge[1], face1: i, face2: undefined }
  			} else {
  				edges[key].face2 = i
  			}
  		}
  	}

  	// generate vertices

  	for (key in edges) {
  		var e = edges[key]

  		// an edge is only rendered if the angle (in degrees) between the face normals of the adjoining faces exceeds this value. default = 1 degree.

  		if (e.face2 === undefined || faces[e.face1].normal.dot(faces[e.face2].normal) <= thresholdDot) {
  			var vertex = sourceVertices[e.index1]
  			vertices.push(vertex.x, vertex.y, vertex.z)

  			vertex = sourceVertices[e.index2]
  			vertices.push(vertex.x, vertex.y, vertex.z)
  		}
  	}

  	// build geometry

  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  }

  EdgesGeometry.prototype = Object.create(BufferGeometry.prototype)
  EdgesGeometry.prototype.constructor = EdgesGeometry

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author Mugen87 / https://github.com/Mugen87
   */

  // CylinderGeometry

  function CylinderGeometry (radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength) {
  	Geometry.call(this)

  	this.type = 'CylinderGeometry'

  	this.parameters = {
  		radiusTop: radiusTop,
  		radiusBottom: radiusBottom,
  		height: height,
  		radialSegments: radialSegments,
  		heightSegments: heightSegments,
  		openEnded: openEnded,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}

  	this.fromBufferGeometry(new CylinderBufferGeometry(radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength))
  	this.mergeVertices()
  }

  CylinderGeometry.prototype = Object.create(Geometry.prototype)
  CylinderGeometry.prototype.constructor = CylinderGeometry

  // CylinderBufferGeometry

  function CylinderBufferGeometry (radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength) {
  	BufferGeometry.call(this)

  	this.type = 'CylinderBufferGeometry'

  	this.parameters = {
  		radiusTop: radiusTop,
  		radiusBottom: radiusBottom,
  		height: height,
  		radialSegments: radialSegments,
  		heightSegments: heightSegments,
  		openEnded: openEnded,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}

  	var scope = this

  	radiusTop = radiusTop !== undefined ? radiusTop : 1
  	radiusBottom = radiusBottom !== undefined ? radiusBottom : 1
  	height = height || 1

  	radialSegments = Math.floor(radialSegments) || 8
  	heightSegments = Math.floor(heightSegments) || 1

  	openEnded = openEnded !== undefined ? openEnded : false
  	thetaStart = thetaStart !== undefined ? thetaStart : 0.0
  	thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// helper variables

  	var index = 0
  	var indexArray = []
  	var halfHeight = height / 2
  	var groupStart = 0

  	// generate geometry

  	generateTorso()

  	if (openEnded === false) {
  		if (radiusTop > 0) generateCap(true)
  		if (radiusBottom > 0) generateCap(false)
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))

  	function generateTorso () {
  		var x, y
  		var normal = new Vector3()
  		var vertex = new Vector3()

  		var groupCount = 0

  		// this will be used to calculate the normal
  		var slope = (radiusBottom - radiusTop) / height

  		// generate vertices, normals and uvs

  		for (y = 0; y <= heightSegments; y++) {
  			var indexRow = []

  			var v = y / heightSegments

  			// calculate the radius of the current row

  			var radius = v * (radiusBottom - radiusTop) + radiusTop

  			for (x = 0; x <= radialSegments; x++) {
  				var u = x / radialSegments

  				var theta = u * thetaLength + thetaStart

  				var sinTheta = Math.sin(theta)
  				var cosTheta = Math.cos(theta)

  				// vertex

  				vertex.x = radius * sinTheta
  				vertex.y = -v * height + halfHeight
  				vertex.z = radius * cosTheta
  				vertices.push(vertex.x, vertex.y, vertex.z)

  				// normal

  				normal.set(sinTheta, slope, cosTheta).normalize()
  				normals.push(normal.x, normal.y, normal.z)

  				// uv

  				uvs.push(u, 1 - v)

  				// save index of vertex in respective row

  				indexRow.push(index++)
  			}

  			// now save vertices of the row in our index array

  			indexArray.push(indexRow)
  		}

  		// generate indices

  		for (x = 0; x < radialSegments; x++) {
  			for (y = 0; y < heightSegments; y++) {
  				// we use the index array to access the correct indices

  				var a = indexArray[y][x]
  				var b = indexArray[y + 1][x]
  				var c = indexArray[y + 1][x + 1]
  				var d = indexArray[y][x + 1]

  				// faces

  				indices.push(a, b, d)
  				indices.push(b, c, d)

  				// update group counter

  				groupCount += 6
  			}
  		}

  		// add a group to the geometry. this will ensure multi material support

  		scope.addGroup(groupStart, groupCount, 0)

  		// calculate new start value for groups

  		groupStart += groupCount
  	}

  	function generateCap (top) {
  		var x, centerIndexStart, centerIndexEnd

  		var uv = new Vector2()
  		var vertex = new Vector3()

  		var groupCount = 0

  		var radius = (top === true) ? radiusTop : radiusBottom
  		var sign = (top === true) ? 1 : -1

  		// save the index of the first center vertex
  		centerIndexStart = index

  		// first we generate the center vertex data of the cap.
  		// because the geometry needs one set of uvs per face,
  		// we must generate a center vertex per face/segment

  		for (x = 1; x <= radialSegments; x++) {
  			// vertex

  			vertices.push(0, halfHeight * sign, 0)

  			// normal

  			normals.push(0, sign, 0)

  			// uv

  			uvs.push(0.5, 0.5)

  			// increase index

  			index++
  		}

  		// save the index of the last center vertex

  		centerIndexEnd = index

  		// now we generate the surrounding vertices, normals and uvs

  		for (x = 0; x <= radialSegments; x++) {
  			var u = x / radialSegments
  			var theta = u * thetaLength + thetaStart

  			var cosTheta = Math.cos(theta)
  			var sinTheta = Math.sin(theta)

  			// vertex

  			vertex.x = radius * sinTheta
  			vertex.y = halfHeight * sign
  			vertex.z = radius * cosTheta
  			vertices.push(vertex.x, vertex.y, vertex.z)

  			// normal

  			normals.push(0, sign, 0)

  			// uv

  			uv.x = (cosTheta * 0.5) + 0.5
  			uv.y = (sinTheta * 0.5 * sign) + 0.5
  			uvs.push(uv.x, uv.y)

  			// increase index

  			index++
  		}

  		// generate indices

  		for (x = 0; x < radialSegments; x++) {
  			var c = centerIndexStart + x
  			var i = centerIndexEnd + x

  			if (top === true) {
  				// face top

  				indices.push(i, i + 1, c)
  			} else {
  				// face bottom

  				indices.push(i + 1, i, c)
  			}

  			groupCount += 3
  		}

  		// add a group to the geometry. this will ensure multi material support

  		scope.addGroup(groupStart, groupCount, top === true ? 1 : 2)

  		// calculate new start value for groups

  		groupStart += groupCount
  	}
  }

  CylinderBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  CylinderBufferGeometry.prototype.constructor = CylinderBufferGeometry

  /**
   * @author abelnation / http://github.com/abelnation
   */

  // ConeGeometry

  function ConeGeometry (radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength) {
  	CylinderGeometry.call(this, 0, radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength)

  	this.type = 'ConeGeometry'

  	this.parameters = {
  		radius: radius,
  		height: height,
  		radialSegments: radialSegments,
  		heightSegments: heightSegments,
  		openEnded: openEnded,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}
  }

  ConeGeometry.prototype = Object.create(CylinderGeometry.prototype)
  ConeGeometry.prototype.constructor = ConeGeometry

  // ConeBufferGeometry

  function ConeBufferGeometry (radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength) {
  	CylinderBufferGeometry.call(this, 0, radius, height, radialSegments, heightSegments, openEnded, thetaStart, thetaLength)

  	this.type = 'ConeBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		height: height,
  		radialSegments: radialSegments,
  		heightSegments: heightSegments,
  		openEnded: openEnded,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}
  }

  ConeBufferGeometry.prototype = Object.create(CylinderBufferGeometry.prototype)
  ConeBufferGeometry.prototype.constructor = ConeBufferGeometry

  /**
   * @author benaadams / https://twitter.com/ben_a_adams
   * @author Mugen87 / https://github.com/Mugen87
   * @author hughes
   */

  // CircleGeometry

  function CircleGeometry (radius, segments, thetaStart, thetaLength) {
  	Geometry.call(this)

  	this.type = 'CircleGeometry'

  	this.parameters = {
  		radius: radius,
  		segments: segments,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}

  	this.fromBufferGeometry(new CircleBufferGeometry(radius, segments, thetaStart, thetaLength))
  	this.mergeVertices()
  }

  CircleGeometry.prototype = Object.create(Geometry.prototype)
  CircleGeometry.prototype.constructor = CircleGeometry

  // CircleBufferGeometry

  function CircleBufferGeometry (radius, segments, thetaStart, thetaLength) {
  	BufferGeometry.call(this)

  	this.type = 'CircleBufferGeometry'

  	this.parameters = {
  		radius: radius,
  		segments: segments,
  		thetaStart: thetaStart,
  		thetaLength: thetaLength
  	}

  	radius = radius || 1
  	segments = segments !== undefined ? Math.max(3, segments) : 8

  	thetaStart = thetaStart !== undefined ? thetaStart : 0
  	thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2

  	// buffers

  	var indices = []
  	var vertices = []
  	var normals = []
  	var uvs = []

  	// helper variables

  	var i, s
  	var vertex = new Vector3()
  	var uv = new Vector2()

  	// center point

  	vertices.push(0, 0, 0)
  	normals.push(0, 0, 1)
  	uvs.push(0.5, 0.5)

  	for (s = 0, i = 3; s <= segments; s++, i += 3) {
  		var segment = thetaStart + s / segments * thetaLength

  		// vertex

  		vertex.x = radius * Math.cos(segment)
  		vertex.y = radius * Math.sin(segment)

  		vertices.push(vertex.x, vertex.y, vertex.z)

  		// normal

  		normals.push(0, 0, 1)

  		// uvs

  		uv.x = (vertices[i] / radius + 1) / 2
  		uv.y = (vertices[i + 1] / radius + 1) / 2

  		uvs.push(uv.x, uv.y)
  	}

  	// indices

  	for (i = 1; i <= segments; i++) {
  		indices.push(i, i + 1, 0)
  	}

  	// build geometry

  	this.setIndex(indices)
  	this.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	this.addAttribute('normal', new Float32BufferAttribute(normals, 3))
  	this.addAttribute('uv', new Float32BufferAttribute(uvs, 2))
  }

  CircleBufferGeometry.prototype = Object.create(BufferGeometry.prototype)
  CircleBufferGeometry.prototype.constructor = CircleBufferGeometry

  var Geometries = /* #__PURE__ */Object.freeze({
  	WireframeGeometry: WireframeGeometry,
  	ParametricGeometry: ParametricGeometry,
  	ParametricBufferGeometry: ParametricBufferGeometry,
  	TetrahedronGeometry: TetrahedronGeometry,
  	TetrahedronBufferGeometry: TetrahedronBufferGeometry,
  	OctahedronGeometry: OctahedronGeometry,
  	OctahedronBufferGeometry: OctahedronBufferGeometry,
  	IcosahedronGeometry: IcosahedronGeometry,
  	IcosahedronBufferGeometry: IcosahedronBufferGeometry,
  	DodecahedronGeometry: DodecahedronGeometry,
  	DodecahedronBufferGeometry: DodecahedronBufferGeometry,
  	PolyhedronGeometry: PolyhedronGeometry,
  	PolyhedronBufferGeometry: PolyhedronBufferGeometry,
  	TubeGeometry: TubeGeometry,
  	TubeBufferGeometry: TubeBufferGeometry,
  	TorusKnotGeometry: TorusKnotGeometry,
  	TorusKnotBufferGeometry: TorusKnotBufferGeometry,
  	TorusGeometry: TorusGeometry,
  	TorusBufferGeometry: TorusBufferGeometry,
  	TextGeometry: TextGeometry,
  	TextBufferGeometry: TextBufferGeometry,
  	SphereGeometry: SphereGeometry,
  	SphereBufferGeometry: SphereBufferGeometry,
  	RingGeometry: RingGeometry,
  	RingBufferGeometry: RingBufferGeometry,
  	PlaneGeometry: PlaneGeometry,
  	PlaneBufferGeometry: PlaneBufferGeometry,
  	LatheGeometry: LatheGeometry,
  	LatheBufferGeometry: LatheBufferGeometry,
  	ShapeGeometry: ShapeGeometry,
  	ShapeBufferGeometry: ShapeBufferGeometry,
  	ExtrudeGeometry: ExtrudeGeometry,
  	ExtrudeBufferGeometry: ExtrudeBufferGeometry,
  	EdgesGeometry: EdgesGeometry,
  	ConeGeometry: ConeGeometry,
  	ConeBufferGeometry: ConeBufferGeometry,
  	CylinderGeometry: CylinderGeometry,
  	CylinderBufferGeometry: CylinderBufferGeometry,
  	CircleGeometry: CircleGeometry,
  	CircleBufferGeometry: CircleBufferGeometry,
  	BoxGeometry: BoxGeometry,
  	BoxBufferGeometry: BoxBufferGeometry
  })

  /**
   * @author mrdoob / http://mrdoob.com/
   *
   * parameters = {
   *  color: <THREE.Color>
   * }
   */

  function ShadowMaterial (parameters) {
  	Material.call(this)

  	this.type = 'ShadowMaterial'

  	this.color = new Color(0x000000)
  	this.transparent = true

  	this.setValues(parameters)
  }

  ShadowMaterial.prototype = Object.create(Material.prototype)
  ShadowMaterial.prototype.constructor = ShadowMaterial

  ShadowMaterial.prototype.isShadowMaterial = true

  ShadowMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.color.copy(source.color)

  	return this
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function RawShaderMaterial (parameters) {
  	ShaderMaterial.call(this, parameters)

  	this.type = 'RawShaderMaterial'
  }

  RawShaderMaterial.prototype = Object.create(ShaderMaterial.prototype)
  RawShaderMaterial.prototype.constructor = RawShaderMaterial

  RawShaderMaterial.prototype.isRawShaderMaterial = true

  /**
   * @author WestLangley / http://github.com/WestLangley
   *
   * parameters = {
   *  color: <hex>,
   *  roughness: <float>,
   *  metalness: <float>,
   *  opacity: <float>,
   *
   *  map: new THREE.Texture( <Image> ),
   *
   *  lightMap: new THREE.Texture( <Image> ),
   *  lightMapIntensity: <float>
   *
   *  aoMap: new THREE.Texture( <Image> ),
   *  aoMapIntensity: <float>
   *
   *  emissive: <hex>,
   *  emissiveIntensity: <float>
   *  emissiveMap: new THREE.Texture( <Image> ),
   *
   *  bumpMap: new THREE.Texture( <Image> ),
   *  bumpScale: <float>,
   *
   *  normalMap: new THREE.Texture( <Image> ),
   *  normalScale: <Vector2>,
   *
   *  displacementMap: new THREE.Texture( <Image> ),
   *  displacementScale: <float>,
   *  displacementBias: <float>,
   *
   *  roughnessMap: new THREE.Texture( <Image> ),
   *
   *  metalnessMap: new THREE.Texture( <Image> ),
   *
   *  alphaMap: new THREE.Texture( <Image> ),
   *
   *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
   *  envMapIntensity: <float>
   *
   *  refractionRatio: <float>,
   *
   *  wireframe: <boolean>,
   *  wireframeLinewidth: <float>,
   *
   *  skinning: <bool>,
   *  morphTargets: <bool>,
   *  morphNormals: <bool>
   * }
   */

  function MeshStandardMaterial (parameters) {
  	Material.call(this)

  	this.defines = { STANDARD: '' }

  	this.type = 'MeshStandardMaterial'

  	this.color = new Color(0xffffff) // diffuse
  	this.roughness = 0.5
  	this.metalness = 0.5

  	this.map = null

  	this.lightMap = null
  	this.lightMapIntensity = 1.0

  	this.aoMap = null
  	this.aoMapIntensity = 1.0

  	this.emissive = new Color(0x000000)
  	this.emissiveIntensity = 1.0
  	this.emissiveMap = null

  	this.bumpMap = null
  	this.bumpScale = 1

  	this.normalMap = null
  	this.normalScale = new Vector2(1, 1)

  	this.displacementMap = null
  	this.displacementScale = 1
  	this.displacementBias = 0

  	this.roughnessMap = null

  	this.metalnessMap = null

  	this.alphaMap = null

  	this.envMap = null
  	this.envMapIntensity = 1.0

  	this.refractionRatio = 0.98

  	this.wireframe = false
  	this.wireframeLinewidth = 1
  	this.wireframeLinecap = 'round'
  	this.wireframeLinejoin = 'round'

  	this.skinning = false
  	this.morphTargets = false
  	this.morphNormals = false

  	this.setValues(parameters)
  }

  MeshStandardMaterial.prototype = Object.create(Material.prototype)
  MeshStandardMaterial.prototype.constructor = MeshStandardMaterial

  MeshStandardMaterial.prototype.isMeshStandardMaterial = true

  MeshStandardMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.defines = { STANDARD: '' }

  	this.color.copy(source.color)
  	this.roughness = source.roughness
  	this.metalness = source.metalness

  	this.map = source.map

  	this.lightMap = source.lightMap
  	this.lightMapIntensity = source.lightMapIntensity

  	this.aoMap = source.aoMap
  	this.aoMapIntensity = source.aoMapIntensity

  	this.emissive.copy(source.emissive)
  	this.emissiveMap = source.emissiveMap
  	this.emissiveIntensity = source.emissiveIntensity

  	this.bumpMap = source.bumpMap
  	this.bumpScale = source.bumpScale

  	this.normalMap = source.normalMap
  	this.normalScale.copy(source.normalScale)

  	this.displacementMap = source.displacementMap
  	this.displacementScale = source.displacementScale
  	this.displacementBias = source.displacementBias

  	this.roughnessMap = source.roughnessMap

  	this.metalnessMap = source.metalnessMap

  	this.alphaMap = source.alphaMap

  	this.envMap = source.envMap
  	this.envMapIntensity = source.envMapIntensity

  	this.refractionRatio = source.refractionRatio

  	this.wireframe = source.wireframe
  	this.wireframeLinewidth = source.wireframeLinewidth
  	this.wireframeLinecap = source.wireframeLinecap
  	this.wireframeLinejoin = source.wireframeLinejoin

  	this.skinning = source.skinning
  	this.morphTargets = source.morphTargets
  	this.morphNormals = source.morphNormals

  	return this
  }

  /**
   * @author WestLangley / http://github.com/WestLangley
   *
   * parameters = {
   *  reflectivity: <float>
   * }
   */

  function MeshPhysicalMaterial (parameters) {
  	MeshStandardMaterial.call(this)

  	this.defines = { PHYSICAL: '' }

  	this.type = 'MeshPhysicalMaterial'

  	this.reflectivity = 0.5 // maps to F0 = 0.04

  	this.clearCoat = 0.0
  	this.clearCoatRoughness = 0.0

  	this.setValues(parameters)
  }

  MeshPhysicalMaterial.prototype = Object.create(MeshStandardMaterial.prototype)
  MeshPhysicalMaterial.prototype.constructor = MeshPhysicalMaterial

  MeshPhysicalMaterial.prototype.isMeshPhysicalMaterial = true

  MeshPhysicalMaterial.prototype.copy = function (source) {
  	MeshStandardMaterial.prototype.copy.call(this, source)

  	this.defines = { PHYSICAL: '' }

  	this.reflectivity = source.reflectivity

  	this.clearCoat = source.clearCoat
  	this.clearCoatRoughness = source.clearCoatRoughness

  	return this
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   *
   * parameters = {
   *  color: <hex>,
   *  specular: <hex>,
   *  shininess: <float>,
   *  opacity: <float>,
   *
   *  map: new THREE.Texture( <Image> ),
   *
   *  lightMap: new THREE.Texture( <Image> ),
   *  lightMapIntensity: <float>
   *
   *  aoMap: new THREE.Texture( <Image> ),
   *  aoMapIntensity: <float>
   *
   *  emissive: <hex>,
   *  emissiveIntensity: <float>
   *  emissiveMap: new THREE.Texture( <Image> ),
   *
   *  bumpMap: new THREE.Texture( <Image> ),
   *  bumpScale: <float>,
   *
   *  normalMap: new THREE.Texture( <Image> ),
   *  normalScale: <Vector2>,
   *
   *  displacementMap: new THREE.Texture( <Image> ),
   *  displacementScale: <float>,
   *  displacementBias: <float>,
   *
   *  specularMap: new THREE.Texture( <Image> ),
   *
   *  alphaMap: new THREE.Texture( <Image> ),
   *
   *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
   *  combine: THREE.Multiply,
   *  reflectivity: <float>,
   *  refractionRatio: <float>,
   *
   *  wireframe: <boolean>,
   *  wireframeLinewidth: <float>,
   *
   *  skinning: <bool>,
   *  morphTargets: <bool>,
   *  morphNormals: <bool>
   * }
   */

  function MeshPhongMaterial (parameters) {
  	Material.call(this)

  	this.type = 'MeshPhongMaterial'

  	this.color = new Color(0xffffff) // diffuse
  	this.specular = new Color(0x111111)
  	this.shininess = 30

  	this.map = null

  	this.lightMap = null
  	this.lightMapIntensity = 1.0

  	this.aoMap = null
  	this.aoMapIntensity = 1.0

  	this.emissive = new Color(0x000000)
  	this.emissiveIntensity = 1.0
  	this.emissiveMap = null

  	this.bumpMap = null
  	this.bumpScale = 1

  	this.normalMap = null
  	this.normalScale = new Vector2(1, 1)

  	this.displacementMap = null
  	this.displacementScale = 1
  	this.displacementBias = 0

  	this.specularMap = null

  	this.alphaMap = null

  	this.envMap = null
  	this.combine = MultiplyOperation
  	this.reflectivity = 1
  	this.refractionRatio = 0.98

  	this.wireframe = false
  	this.wireframeLinewidth = 1
  	this.wireframeLinecap = 'round'
  	this.wireframeLinejoin = 'round'

  	this.skinning = false
  	this.morphTargets = false
  	this.morphNormals = false

  	this.setValues(parameters)
  }

  MeshPhongMaterial.prototype = Object.create(Material.prototype)
  MeshPhongMaterial.prototype.constructor = MeshPhongMaterial

  MeshPhongMaterial.prototype.isMeshPhongMaterial = true

  MeshPhongMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.color.copy(source.color)
  	this.specular.copy(source.specular)
  	this.shininess = source.shininess

  	this.map = source.map

  	this.lightMap = source.lightMap
  	this.lightMapIntensity = source.lightMapIntensity

  	this.aoMap = source.aoMap
  	this.aoMapIntensity = source.aoMapIntensity

  	this.emissive.copy(source.emissive)
  	this.emissiveMap = source.emissiveMap
  	this.emissiveIntensity = source.emissiveIntensity

  	this.bumpMap = source.bumpMap
  	this.bumpScale = source.bumpScale

  	this.normalMap = source.normalMap
  	this.normalScale.copy(source.normalScale)

  	this.displacementMap = source.displacementMap
  	this.displacementScale = source.displacementScale
  	this.displacementBias = source.displacementBias

  	this.specularMap = source.specularMap

  	this.alphaMap = source.alphaMap

  	this.envMap = source.envMap
  	this.combine = source.combine
  	this.reflectivity = source.reflectivity
  	this.refractionRatio = source.refractionRatio

  	this.wireframe = source.wireframe
  	this.wireframeLinewidth = source.wireframeLinewidth
  	this.wireframeLinecap = source.wireframeLinecap
  	this.wireframeLinejoin = source.wireframeLinejoin

  	this.skinning = source.skinning
  	this.morphTargets = source.morphTargets
  	this.morphNormals = source.morphNormals

  	return this
  }

  /**
   * @author takahirox / http://github.com/takahirox
   *
   * parameters = {
   *  gradientMap: new THREE.Texture( <Image> )
   * }
   */

  function MeshToonMaterial (parameters) {
  	MeshPhongMaterial.call(this)

  	this.defines = { TOON: '' }

  	this.type = 'MeshToonMaterial'

  	this.gradientMap = null

  	this.setValues(parameters)
  }

  MeshToonMaterial.prototype = Object.create(MeshPhongMaterial.prototype)
  MeshToonMaterial.prototype.constructor = MeshToonMaterial

  MeshToonMaterial.prototype.isMeshToonMaterial = true

  MeshToonMaterial.prototype.copy = function (source) {
  	MeshPhongMaterial.prototype.copy.call(this, source)

  	this.gradientMap = source.gradientMap

  	return this
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author WestLangley / http://github.com/WestLangley
   *
   * parameters = {
   *  opacity: <float>,
   *
   *  bumpMap: new THREE.Texture( <Image> ),
   *  bumpScale: <float>,
   *
   *  normalMap: new THREE.Texture( <Image> ),
   *  normalScale: <Vector2>,
   *
   *  displacementMap: new THREE.Texture( <Image> ),
   *  displacementScale: <float>,
   *  displacementBias: <float>,
   *
   *  wireframe: <boolean>,
   *  wireframeLinewidth: <float>
   *
   *  skinning: <bool>,
   *  morphTargets: <bool>,
   *  morphNormals: <bool>
   * }
   */

  function MeshNormalMaterial (parameters) {
  	Material.call(this)

  	this.type = 'MeshNormalMaterial'

  	this.bumpMap = null
  	this.bumpScale = 1

  	this.normalMap = null
  	this.normalScale = new Vector2(1, 1)

  	this.displacementMap = null
  	this.displacementScale = 1
  	this.displacementBias = 0

  	this.wireframe = false
  	this.wireframeLinewidth = 1

  	this.fog = false
  	this.lights = false

  	this.skinning = false
  	this.morphTargets = false
  	this.morphNormals = false

  	this.setValues(parameters)
  }

  MeshNormalMaterial.prototype = Object.create(Material.prototype)
  MeshNormalMaterial.prototype.constructor = MeshNormalMaterial

  MeshNormalMaterial.prototype.isMeshNormalMaterial = true

  MeshNormalMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.bumpMap = source.bumpMap
  	this.bumpScale = source.bumpScale

  	this.normalMap = source.normalMap
  	this.normalScale.copy(source.normalScale)

  	this.displacementMap = source.displacementMap
  	this.displacementScale = source.displacementScale
  	this.displacementBias = source.displacementBias

  	this.wireframe = source.wireframe
  	this.wireframeLinewidth = source.wireframeLinewidth

  	this.skinning = source.skinning
  	this.morphTargets = source.morphTargets
  	this.morphNormals = source.morphNormals

  	return this
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   *
   * parameters = {
   *  color: <hex>,
   *  opacity: <float>,
   *
   *  map: new THREE.Texture( <Image> ),
   *
   *  lightMap: new THREE.Texture( <Image> ),
   *  lightMapIntensity: <float>
   *
   *  aoMap: new THREE.Texture( <Image> ),
   *  aoMapIntensity: <float>
   *
   *  emissive: <hex>,
   *  emissiveIntensity: <float>
   *  emissiveMap: new THREE.Texture( <Image> ),
   *
   *  specularMap: new THREE.Texture( <Image> ),
   *
   *  alphaMap: new THREE.Texture( <Image> ),
   *
   *  envMap: new THREE.CubeTexture( [posx, negx, posy, negy, posz, negz] ),
   *  combine: THREE.Multiply,
   *  reflectivity: <float>,
   *  refractionRatio: <float>,
   *
   *  wireframe: <boolean>,
   *  wireframeLinewidth: <float>,
   *
   *  skinning: <bool>,
   *  morphTargets: <bool>,
   *  morphNormals: <bool>
   * }
   */

  function MeshLambertMaterial (parameters) {
  	Material.call(this)

  	this.type = 'MeshLambertMaterial'

  	this.color = new Color(0xffffff) // diffuse

  	this.map = null

  	this.lightMap = null
  	this.lightMapIntensity = 1.0

  	this.aoMap = null
  	this.aoMapIntensity = 1.0

  	this.emissive = new Color(0x000000)
  	this.emissiveIntensity = 1.0
  	this.emissiveMap = null

  	this.specularMap = null

  	this.alphaMap = null

  	this.envMap = null
  	this.combine = MultiplyOperation
  	this.reflectivity = 1
  	this.refractionRatio = 0.98

  	this.wireframe = false
  	this.wireframeLinewidth = 1
  	this.wireframeLinecap = 'round'
  	this.wireframeLinejoin = 'round'

  	this.skinning = false
  	this.morphTargets = false
  	this.morphNormals = false

  	this.setValues(parameters)
  }

  MeshLambertMaterial.prototype = Object.create(Material.prototype)
  MeshLambertMaterial.prototype.constructor = MeshLambertMaterial

  MeshLambertMaterial.prototype.isMeshLambertMaterial = true

  MeshLambertMaterial.prototype.copy = function (source) {
  	Material.prototype.copy.call(this, source)

  	this.color.copy(source.color)

  	this.map = source.map

  	this.lightMap = source.lightMap
  	this.lightMapIntensity = source.lightMapIntensity

  	this.aoMap = source.aoMap
  	this.aoMapIntensity = source.aoMapIntensity

  	this.emissive.copy(source.emissive)
  	this.emissiveMap = source.emissiveMap
  	this.emissiveIntensity = source.emissiveIntensity

  	this.specularMap = source.specularMap

  	this.alphaMap = source.alphaMap

  	this.envMap = source.envMap
  	this.combine = source.combine
  	this.reflectivity = source.reflectivity
  	this.refractionRatio = source.refractionRatio

  	this.wireframe = source.wireframe
  	this.wireframeLinewidth = source.wireframeLinewidth
  	this.wireframeLinecap = source.wireframeLinecap
  	this.wireframeLinejoin = source.wireframeLinejoin

  	this.skinning = source.skinning
  	this.morphTargets = source.morphTargets
  	this.morphNormals = source.morphNormals

  	return this
  }

  /**
   * @author alteredq / http://alteredqualia.com/
   *
   * parameters = {
   *  color: <hex>,
   *  opacity: <float>,
   *
   *  linewidth: <float>,
   *
   *  scale: <float>,
   *  dashSize: <float>,
   *  gapSize: <float>
   * }
   */

  function LineDashedMaterial (parameters) {
  	LineBasicMaterial.call(this)

  	this.type = 'LineDashedMaterial'

  	this.scale = 1
  	this.dashSize = 3
  	this.gapSize = 1

  	this.setValues(parameters)
  }

  LineDashedMaterial.prototype = Object.create(LineBasicMaterial.prototype)
  LineDashedMaterial.prototype.constructor = LineDashedMaterial

  LineDashedMaterial.prototype.isLineDashedMaterial = true

  LineDashedMaterial.prototype.copy = function (source) {
  	LineBasicMaterial.prototype.copy.call(this, source)

  	this.scale = source.scale
  	this.dashSize = source.dashSize
  	this.gapSize = source.gapSize

  	return this
  }

  var Materials = /* #__PURE__ */Object.freeze({
  	ShadowMaterial: ShadowMaterial,
  	SpriteMaterial: SpriteMaterial,
  	RawShaderMaterial: RawShaderMaterial,
  	ShaderMaterial: ShaderMaterial,
  	PointsMaterial: PointsMaterial,
  	MeshPhysicalMaterial: MeshPhysicalMaterial,
  	MeshStandardMaterial: MeshStandardMaterial,
  	MeshPhongMaterial: MeshPhongMaterial,
  	MeshToonMaterial: MeshToonMaterial,
  	MeshNormalMaterial: MeshNormalMaterial,
  	MeshLambertMaterial: MeshLambertMaterial,
  	MeshDepthMaterial: MeshDepthMaterial,
  	MeshDistanceMaterial: MeshDistanceMaterial,
  	MeshBasicMaterial: MeshBasicMaterial,
  	LineDashedMaterial: LineDashedMaterial,
  	LineBasicMaterial: LineBasicMaterial,
  	Material: Material
  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  var Cache = {

  	enabled: false,

  	files: {},

  	add: function (key, file) {
  		if (this.enabled === false) return

  		// console.log( 'THREE.Cache', 'Adding key:', key );

  		this.files[key] = file
  	},

  	get: function (key) {
  		if (this.enabled === false) return

  		// console.log( 'THREE.Cache', 'Checking key:', key );

  		return this.files[key]
  	},

  	remove: function (key) {
  		delete this.files[key]
  	},

  	clear: function () {
  		this.files = {}
  	}

  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function LoadingManager (onLoad, onProgress, onError) {
  	var scope = this

  	var isLoading = false
  	var itemsLoaded = 0
  	var itemsTotal = 0
  	var urlModifier = undefined

  	this.onStart = undefined
  	this.onLoad = onLoad
  	this.onProgress = onProgress
  	this.onError = onError

  	this.itemStart = function (url) {
  		itemsTotal++

  		if (isLoading === false) {
  			if (scope.onStart !== undefined) {
  				scope.onStart(url, itemsLoaded, itemsTotal)
  			}
  		}

  		isLoading = true
  	}

  	this.itemEnd = function (url) {
  		itemsLoaded++

  		if (scope.onProgress !== undefined) {
  			scope.onProgress(url, itemsLoaded, itemsTotal)
  		}

  		if (itemsLoaded === itemsTotal) {
  			isLoading = false

  			if (scope.onLoad !== undefined) {
  				scope.onLoad()
  			}
  		}
  	}

  	this.itemError = function (url) {
  		if (scope.onError !== undefined) {
  			scope.onError(url)
  		}
  	}

  	this.resolveURL = function (url) {
  		if (urlModifier) {
  			return urlModifier(url)
  		}

  		return url
  	}

  	this.setURLModifier = function (transform) {
  		urlModifier = transform
  		return this
  	}
  }

  var DefaultLoadingManager = new LoadingManager()

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  var loading = {}

  function FileLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  }

  Object.assign(FileLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		if (url === undefined) url = ''

  		if (this.path !== undefined) url = this.path + url

  		url = this.manager.resolveURL(url)

  		var scope = this

  		var cached = Cache.get(url)

  		if (cached !== undefined) {
  			scope.manager.itemStart(url)

  			setTimeout(function () {
  				if (onLoad) onLoad(cached)

  				scope.manager.itemEnd(url)
  			}, 0)

  			return cached
  		}

  		// Check if request is duplicate

  		if (loading[url] !== undefined) {
  			loading[url].push({

  				onLoad: onLoad,
  				onProgress: onProgress,
  				onError: onError

  			})

  			return
  		}

  		// Check for data: URI
  		var dataUriRegex = /^data:(.*?)(;base64)?,(.*)$/
  		var dataUriRegexResult = url.match(dataUriRegex)

  		// Safari can not handle Data URIs through XMLHttpRequest so process manually
  		if (dataUriRegexResult) {
  			var mimeType = dataUriRegexResult[1]
  			var isBase64 = !!dataUriRegexResult[2]
  			var data = dataUriRegexResult[3]

  			data = window.decodeURIComponent(data)

  			if (isBase64) data = window.atob(data)

  			try {
  				var response
  				var responseType = (this.responseType || '').toLowerCase()

  				switch (responseType) {
  					case 'arraybuffer':
  					case 'blob':

  						var view = new Uint8Array(data.length)

  						for (var i = 0; i < data.length; i++) {
  							view[i] = data.charCodeAt(i)
  						}

  						if (responseType === 'blob') {
  							response = new Blob([view.buffer], { type: mimeType })
  						} else {
  							response = view.buffer
  						}

  						break

  					case 'document':

  						var parser = new DOMParser()
  						response = parser.parseFromString(data, mimeType)

  						break

  					case 'json':

  						response = JSON.parse(data)

  						break

  					default: // 'text' or other

  						response = data

  						break
  				}

  				// Wait for next browser tick like standard XMLHttpRequest event dispatching does
  				window.setTimeout(function () {
  					if (onLoad) onLoad(response)

  					scope.manager.itemEnd(url)
  				}, 0)
  			} catch (error) {
  				// Wait for next browser tick like standard XMLHttpRequest event dispatching does
  				window.setTimeout(function () {
  					if (onError) onError(error)

  					scope.manager.itemEnd(url)
  					scope.manager.itemError(url)
  				}, 0)
  			}
  		} else {
  			// Initialise array for duplicate requests

  			loading[url] = []

  			loading[url].push({

  				onLoad: onLoad,
  				onProgress: onProgress,
  				onError: onError

  			})

  			var request = new XMLHttpRequest()

  			request.open('GET', url, true)

  			request.addEventListener('load', function (event) {
  				var response = this.response

  				Cache.add(url, response)

  				var callbacks = loading[url]

  				delete loading[url]

  				if (this.status === 200 || this.status === 0) {
  					// Some browsers return HTTP Status 0 when using non-http protocol
  					// e.g. 'file://' or 'data://'. Handle as success.

  					if (this.status === 0) console.warn('THREE.FileLoader: HTTP Status 0 received.')

  					for (var i = 0, il = callbacks.length; i < il; i++) {
  						var callback = callbacks[i]
  						if (callback.onLoad) callback.onLoad(response)
  					}

  					scope.manager.itemEnd(url)
  				} else {
  					for (var i = 0, il = callbacks.length; i < il; i++) {
  						var callback = callbacks[i]
  						if (callback.onError) callback.onError(event)
  					}

  					scope.manager.itemEnd(url)
  					scope.manager.itemError(url)
  				}
  			}, false)

  			request.addEventListener('progress', function (event) {
  				var callbacks = loading[url]

  				for (var i = 0, il = callbacks.length; i < il; i++) {
  					var callback = callbacks[i]
  					if (callback.onProgress) callback.onProgress(event)
  				}
  			}, false)

  			request.addEventListener('error', function (event) {
  				var callbacks = loading[url]

  				delete loading[url]

  				for (var i = 0, il = callbacks.length; i < il; i++) {
  					var callback = callbacks[i]
  					if (callback.onError) callback.onError(event)
  				}

  				scope.manager.itemEnd(url)
  				scope.manager.itemError(url)
  			}, false)

  			if (this.responseType !== undefined) request.responseType = this.responseType
  			if (this.withCredentials !== undefined) request.withCredentials = this.withCredentials

  			if (request.overrideMimeType) request.overrideMimeType(this.mimeType !== undefined ? this.mimeType : 'text/plain')

  			for (var header in this.requestHeader) {
  				request.setRequestHeader(header, this.requestHeader[header])
  			}

  			request.send(null)
  		}

  		scope.manager.itemStart(url)

  		return request
  	},

  	setPath: function (value) {
  		this.path = value
  		return this
  	},

  	setResponseType: function (value) {
  		this.responseType = value
  		return this
  	},

  	setWithCredentials: function (value) {
  		this.withCredentials = value
  		return this
  	},

  	setMimeType: function (value) {
  		this.mimeType = value
  		return this
  	},

  	setRequestHeader: function (value) {
  		this.requestHeader = value
  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   *
   * Abstract Base class to block based textures loader (dds, pvr, ...)
   */

  function CompressedTextureLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager

  	// override in sub classes
  	this._parser = null
  }

  Object.assign(CompressedTextureLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		var scope = this

  		var images = []

  		var texture = new CompressedTexture()
  		texture.image = images

  		var loader = new FileLoader(this.manager)
  		loader.setPath(this.path)
  		loader.setResponseType('arraybuffer')

  		function loadTexture (i) {
  			loader.load(url[i], function (buffer) {
  				var texDatas = scope._parser(buffer, true)

  				images[i] = {
  					width: texDatas.width,
  					height: texDatas.height,
  					format: texDatas.format,
  					mipmaps: texDatas.mipmaps
  				}

  				loaded += 1

  				if (loaded === 6) {
  					if (texDatas.mipmapCount === 1) { texture.minFilter = LinearFilter }

  					texture.format = texDatas.format
  					texture.needsUpdate = true

  					if (onLoad) onLoad(texture)
  				}
  			}, onProgress, onError)
  		}

  		if (Array.isArray(url)) {
  			var loaded = 0

  			for (var i = 0, il = url.length; i < il; ++i) {
  				loadTexture(i)
  			}
  		} else {
  			// compressed cubemap texture stored in a single DDS file

  			loader.load(url, function (buffer) {
  				var texDatas = scope._parser(buffer, true)

  				if (texDatas.isCubemap) {
  					var faces = texDatas.mipmaps.length / texDatas.mipmapCount

  					for (var f = 0; f < faces; f++) {
  						images[f] = { mipmaps: [] }

  						for (var i = 0; i < texDatas.mipmapCount; i++) {
  							images[f].mipmaps.push(texDatas.mipmaps[f * texDatas.mipmapCount + i])
  							images[f].format = texDatas.format
  							images[f].width = texDatas.width
  							images[f].height = texDatas.height
  						}
  					}
  				} else {
  					texture.image.width = texDatas.width
  					texture.image.height = texDatas.height
  					texture.mipmaps = texDatas.mipmaps
  				}

  				if (texDatas.mipmapCount === 1) {
  					texture.minFilter = LinearFilter
  				}

  				texture.format = texDatas.format
  				texture.needsUpdate = true

  				if (onLoad) onLoad(texture)
  			}, onProgress, onError)
  		}

  		return texture
  	},

  	setPath: function (value) {
  		this.path = value
  		return this
  	}

  })

  /**
   * @author Nikos M. / https://github.com/foo123/
   *
   * Abstract Base class to load generic binary textures formats (rgbe, hdr, ...)
   */

  function DataTextureLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager

  	// override in sub classes
  	this._parser = null
  }

  Object.assign(DataTextureLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		var scope = this

  		var texture = new DataTexture()

  		var loader = new FileLoader(this.manager)
  		loader.setResponseType('arraybuffer')

  		loader.load(url, function (buffer) {
  			var texData = scope._parser(buffer)

  			if (!texData) return

  			if (undefined !== texData.image) {
  				texture.image = texData.image
  			} else if (undefined !== texData.data) {
  				texture.image.width = texData.width
  				texture.image.height = texData.height
  				texture.image.data = texData.data
  			}

  			texture.wrapS = undefined !== texData.wrapS ? texData.wrapS : ClampToEdgeWrapping
  			texture.wrapT = undefined !== texData.wrapT ? texData.wrapT : ClampToEdgeWrapping

  			texture.magFilter = undefined !== texData.magFilter ? texData.magFilter : LinearFilter
  			texture.minFilter = undefined !== texData.minFilter ? texData.minFilter : LinearMipMapLinearFilter

  			texture.anisotropy = undefined !== texData.anisotropy ? texData.anisotropy : 1

  			if (undefined !== texData.format) {
  				texture.format = texData.format
  			}
  			if (undefined !== texData.type) {
  				texture.type = texData.type
  			}

  			if (undefined !== texData.mipmaps) {
  				texture.mipmaps = texData.mipmaps
  			}

  			if (texData.mipmapCount === 1) {
  				texture.minFilter = LinearFilter
  			}

  			texture.needsUpdate = true

  			if (onLoad) onLoad(texture, texData)
  		}, onProgress, onError)

  		return texture
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function ImageLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  }

  Object.assign(ImageLoader.prototype, {

  	crossOrigin: 'Anonymous',

  	load: function (url, onLoad, onProgress, onError) {
  		if (url === undefined) url = ''

  		if (this.path !== undefined) url = this.path + url

  		url = this.manager.resolveURL(url)

  		var scope = this

  		var cached = Cache.get(url)

  		if (cached !== undefined) {
  			scope.manager.itemStart(url)

  			setTimeout(function () {
  				if (onLoad) onLoad(cached)

  				scope.manager.itemEnd(url)
  			}, 0)

  			return cached
  		}

  		var image = document.createElementNS('http://www.w3.org/1999/xhtml', 'img')

  		function onImageLoad () {
  			image.removeEventListener('load', onImageLoad, false)
  			image.removeEventListener('error', onImageError, false)

  			Cache.add(url, this)

  			if (onLoad) onLoad(this)

  			scope.manager.itemEnd(url)
  		}

  		function onImageError (event) {
  			image.removeEventListener('load', onImageLoad, false)
  			image.removeEventListener('error', onImageError, false)

  			if (onError) onError(event)

  			scope.manager.itemEnd(url)
  			scope.manager.itemError(url)
  		}

  		image.addEventListener('load', onImageLoad, false)
  		image.addEventListener('error', onImageError, false)

  		if (url.substr(0, 5) !== 'data:') {
  			if (this.crossOrigin !== undefined) image.crossOrigin = this.crossOrigin
  		}

  		scope.manager.itemStart(url)

  		image.src = url

  		return image
  	},

  	setCrossOrigin: function (value) {
  		this.crossOrigin = value
  		return this
  	},

  	setPath: function (value) {
  		this.path = value
  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function CubeTextureLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  }

  Object.assign(CubeTextureLoader.prototype, {

  	crossOrigin: 'Anonymous',

  	load: function (urls, onLoad, onProgress, onError) {
  		var texture = new CubeTexture()

  		var loader = new ImageLoader(this.manager)
  		loader.setCrossOrigin(this.crossOrigin)
  		loader.setPath(this.path)

  		var loaded = 0

  		function loadTexture (i) {
  			loader.load(urls[i], function (image) {
  				texture.images[i] = image

  				loaded++

  				if (loaded === 6) {
  					texture.needsUpdate = true

  					if (onLoad) onLoad(texture)
  				}
  			}, undefined, onError)
  		}

  		for (var i = 0; i < urls.length; ++i) {
  			loadTexture(i)
  		}

  		return texture
  	},

  	setCrossOrigin: function (value) {
  		this.crossOrigin = value
  		return this
  	},

  	setPath: function (value) {
  		this.path = value
  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function TextureLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  }

  Object.assign(TextureLoader.prototype, {

  	crossOrigin: 'Anonymous',

  	load: function (url, onLoad, onProgress, onError) {
  		var texture = new Texture()

  		var loader = new ImageLoader(this.manager)
  		loader.setCrossOrigin(this.crossOrigin)
  		loader.setPath(this.path)

  		loader.load(url, function (image) {
  			texture.image = image

  			// JPEGs can't have an alpha channel, so memory can be saved by storing them as RGB.
  			var isJPEG = url.search(/\.(jpg|jpeg)$/) > 0 || url.search(/^data\:image\/jpeg/) === 0

  			texture.format = isJPEG ? RGBFormat : RGBAFormat
  			texture.needsUpdate = true

  			if (onLoad !== undefined) {
  				onLoad(texture)
  			}
  		}, onProgress, onError)

  		return texture
  	},

  	setCrossOrigin: function (value) {
  		this.crossOrigin = value
  		return this
  	},

  	setPath: function (value) {
  		this.path = value
  		return this
  	}

  })

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   * Extensible curve object
   *
   * Some common of curve methods:
   * .getPoint( t, optionalTarget ), .getTangent( t )
   * .getPointAt( u, optionalTarget ), .getTangentAt( u )
   * .getPoints(), .getSpacedPoints()
   * .getLength()
   * .updateArcLengths()
   *
   * This following curves inherit from THREE.Curve:
   *
   * -- 2D curves --
   * THREE.ArcCurve
   * THREE.CubicBezierCurve
   * THREE.EllipseCurve
   * THREE.LineCurve
   * THREE.QuadraticBezierCurve
   * THREE.SplineCurve
   *
   * -- 3D curves --
   * THREE.CatmullRomCurve3
   * THREE.CubicBezierCurve3
   * THREE.LineCurve3
   * THREE.QuadraticBezierCurve3
   *
   * A series of curves can be represented as a THREE.CurvePath.
   *
   **/

  /**************************************************************
   *	Abstract Curve base class
   **************************************************************/

  function Curve () {
  	this.type = 'Curve'

  	this.arcLengthDivisions = 200
  }

  Object.assign(Curve.prototype, {

  	// Virtual base class method to overwrite and implement in subclasses
  	//	- t [0 .. 1]

  	getPoint: function (/* t, optionalTarget */) {
  		console.warn('THREE.Curve: .getPoint() not implemented.')
  		return null
  	},

  	// Get point at relative position in curve according to arc length
  	// - u [0 .. 1]

  	getPointAt: function (u, optionalTarget) {
  		var t = this.getUtoTmapping(u)
  		return this.getPoint(t, optionalTarget)
  	},

  	// Get sequence of points using getPoint( t )

  	getPoints: function (divisions) {
  		if (divisions === undefined) divisions = 5

  		var points = []

  		for (var d = 0; d <= divisions; d++) {
  			points.push(this.getPoint(d / divisions))
  		}

  		return points
  	},

  	// Get sequence of points using getPointAt( u )

  	getSpacedPoints: function (divisions) {
  		if (divisions === undefined) divisions = 5

  		var points = []

  		for (var d = 0; d <= divisions; d++) {
  			points.push(this.getPointAt(d / divisions))
  		}

  		return points
  	},

  	// Get total curve arc length

  	getLength: function () {
  		var lengths = this.getLengths()
  		return lengths[lengths.length - 1]
  	},

  	// Get list of cumulative segment lengths

  	getLengths: function (divisions) {
  		if (divisions === undefined) divisions = this.arcLengthDivisions

  		if (this.cacheArcLengths &&
  			(this.cacheArcLengths.length === divisions + 1) &&
  			!this.needsUpdate) {
  			return this.cacheArcLengths
  		}

  		this.needsUpdate = false

  		var cache = []
  		var current; var last = this.getPoint(0)
  		var p; var sum = 0

  		cache.push(0)

  		for (p = 1; p <= divisions; p++) {
  			current = this.getPoint(p / divisions)
  			sum += current.distanceTo(last)
  			cache.push(sum)
  			last = current
  		}

  		this.cacheArcLengths = cache

  		return cache // { sums: cache, sum: sum }; Sum is in the last element.
  	},

  	updateArcLengths: function () {
  		this.needsUpdate = true
  		this.getLengths()
  	},

  	// Given u ( 0 .. 1 ), get a t to find p. This gives you points which are equidistant

  	getUtoTmapping: function (u, distance) {
  		var arcLengths = this.getLengths()

  		var i = 0; var il = arcLengths.length

  		var targetArcLength // The targeted u distance value to get

  		if (distance) {
  			targetArcLength = distance
  		} else {
  			targetArcLength = u * arcLengths[il - 1]
  		}

  		// binary search for the index with largest value smaller than target u distance

  		var low = 0; var high = il - 1; var comparison

  		while (low <= high) {
  			i = Math.floor(low + (high - low) / 2) // less likely to overflow, though probably not issue here, JS doesn't really have integers, all numbers are floats

  			comparison = arcLengths[i] - targetArcLength

  			if (comparison < 0) {
  				low = i + 1
  			} else if (comparison > 0) {
  				high = i - 1
  			} else {
  				high = i
  				break

  				// DONE
  			}
  		}

  		i = high

  		if (arcLengths[i] === targetArcLength) {
  			return i / (il - 1)
  		}

  		// we could get finer grain at lengths, or use simple interpolation between two points

  		var lengthBefore = arcLengths[i]
  		var lengthAfter = arcLengths[i + 1]

  		var segmentLength = lengthAfter - lengthBefore

  		// determine where we are between the 'before' and 'after' points

  		var segmentFraction = (targetArcLength - lengthBefore) / segmentLength

  		// add that fractional amount to t

  		var t = (i + segmentFraction) / (il - 1)

  		return t
  	},

  	// Returns a unit vector tangent at t
  	// In case any sub curve does not implement its tangent derivation,
  	// 2 points a small delta apart will be used to find its gradient
  	// which seems to give a reasonable approximation

  	getTangent: function (t) {
  		var delta = 0.0001
  		var t1 = t - delta
  		var t2 = t + delta

  		// Capping in case of danger

  		if (t1 < 0) t1 = 0
  		if (t2 > 1) t2 = 1

  		var pt1 = this.getPoint(t1)
  		var pt2 = this.getPoint(t2)

  		var vec = pt2.clone().sub(pt1)
  		return vec.normalize()
  	},

  	getTangentAt: function (u) {
  		var t = this.getUtoTmapping(u)
  		return this.getTangent(t)
  	},

  	computeFrenetFrames: function (segments, closed) {
  		// see http://www.cs.indiana.edu/pub/techreports/TR425.pdf

  		var normal = new Vector3()

  		var tangents = []
  		var normals = []
  		var binormals = []

  		var vec = new Vector3()
  		var mat = new Matrix4()

  		var i, u, theta

  		// compute the tangent vectors for each segment on the curve

  		for (i = 0; i <= segments; i++) {
  			u = i / segments

  			tangents[i] = this.getTangentAt(u)
  			tangents[i].normalize()
  		}

  		// select an initial normal vector perpendicular to the first tangent vector,
  		// and in the direction of the minimum tangent xyz component

  		normals[0] = new Vector3()
  		binormals[0] = new Vector3()
  		var min = Number.MAX_VALUE
  		var tx = Math.abs(tangents[0].x)
  		var ty = Math.abs(tangents[0].y)
  		var tz = Math.abs(tangents[0].z)

  		if (tx <= min) {
  			min = tx
  			normal.set(1, 0, 0)
  		}

  		if (ty <= min) {
  			min = ty
  			normal.set(0, 1, 0)
  		}

  		if (tz <= min) {
  			normal.set(0, 0, 1)
  		}

  		vec.crossVectors(tangents[0], normal).normalize()

  		normals[0].crossVectors(tangents[0], vec)
  		binormals[0].crossVectors(tangents[0], normals[0])

  		// compute the slowly-varying normal and binormal vectors for each segment on the curve

  		for (i = 1; i <= segments; i++) {
  			normals[i] = normals[i - 1].clone()

  			binormals[i] = binormals[i - 1].clone()

  			vec.crossVectors(tangents[i - 1], tangents[i])

  			if (vec.length() > Number.EPSILON) {
  				vec.normalize()

  				theta = Math.acos(_Math.clamp(tangents[i - 1].dot(tangents[i]), -1, 1)) // clamp for floating pt errors

  				normals[i].applyMatrix4(mat.makeRotationAxis(vec, theta))
  			}

  			binormals[i].crossVectors(tangents[i], normals[i])
  		}

  		// if the curve is closed, postprocess the vectors so the first and last normal vectors are the same

  		if (closed === true) {
  			theta = Math.acos(_Math.clamp(normals[0].dot(normals[segments]), -1, 1))
  			theta /= segments

  			if (tangents[0].dot(vec.crossVectors(normals[0], normals[segments])) > 0) {
  				theta = -theta
  			}

  			for (i = 1; i <= segments; i++) {
  				// twist a little...
  				normals[i].applyMatrix4(mat.makeRotationAxis(tangents[i], theta * i))
  				binormals[i].crossVectors(tangents[i], normals[i])
  			}
  		}

  		return {
  			tangents: tangents,
  			normals: normals,
  			binormals: binormals
  		}
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (source) {
  		this.arcLengthDivisions = source.arcLengthDivisions

  		return this
  	},

  	toJSON: function () {
  		var data = {
  			metadata: {
  				version: 4.5,
  				type: 'Curve',
  				generator: 'Curve.toJSON'
  			}
  		}

  		data.arcLengthDivisions = this.arcLengthDivisions
  		data.type = this.type

  		return data
  	},

  	fromJSON: function (json) {
  		this.arcLengthDivisions = json.arcLengthDivisions

  		return this
  	}

  })

  function EllipseCurve (aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation) {
  	Curve.call(this)

  	this.type = 'EllipseCurve'

  	this.aX = aX || 0
  	this.aY = aY || 0

  	this.xRadius = xRadius || 1
  	this.yRadius = yRadius || 1

  	this.aStartAngle = aStartAngle || 0
  	this.aEndAngle = aEndAngle || 2 * Math.PI

  	this.aClockwise = aClockwise || false

  	this.aRotation = aRotation || 0
  }

  EllipseCurve.prototype = Object.create(Curve.prototype)
  EllipseCurve.prototype.constructor = EllipseCurve

  EllipseCurve.prototype.isEllipseCurve = true

  EllipseCurve.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector2()

  	var twoPi = Math.PI * 2
  	var deltaAngle = this.aEndAngle - this.aStartAngle
  	var samePoints = Math.abs(deltaAngle) < Number.EPSILON

  	// ensures that deltaAngle is 0 .. 2 PI
  	while (deltaAngle < 0) deltaAngle += twoPi
  	while (deltaAngle > twoPi) deltaAngle -= twoPi

  	if (deltaAngle < Number.EPSILON) {
  		if (samePoints) {
  			deltaAngle = 0
  		} else {
  			deltaAngle = twoPi
  		}
  	}

  	if (this.aClockwise === true && !samePoints) {
  		if (deltaAngle === twoPi) {
  			deltaAngle = -twoPi
  		} else {
  			deltaAngle = deltaAngle - twoPi
  		}
  	}

  	var angle = this.aStartAngle + t * deltaAngle
  	var x = this.aX + this.xRadius * Math.cos(angle)
  	var y = this.aY + this.yRadius * Math.sin(angle)

  	if (this.aRotation !== 0) {
  		var cos = Math.cos(this.aRotation)
  		var sin = Math.sin(this.aRotation)

  		var tx = x - this.aX
  		var ty = y - this.aY

  		// Rotate the point about the center of the ellipse.
  		x = tx * cos - ty * sin + this.aX
  		y = tx * sin + ty * cos + this.aY
  	}

  	return point.set(x, y)
  }

  EllipseCurve.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.aX = source.aX
  	this.aY = source.aY

  	this.xRadius = source.xRadius
  	this.yRadius = source.yRadius

  	this.aStartAngle = source.aStartAngle
  	this.aEndAngle = source.aEndAngle

  	this.aClockwise = source.aClockwise

  	this.aRotation = source.aRotation

  	return this
  }

  EllipseCurve.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.aX = this.aX
  	data.aY = this.aY

  	data.xRadius = this.xRadius
  	data.yRadius = this.yRadius

  	data.aStartAngle = this.aStartAngle
  	data.aEndAngle = this.aEndAngle

  	data.aClockwise = this.aClockwise

  	data.aRotation = this.aRotation

  	return data
  }

  EllipseCurve.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.aX = json.aX
  	this.aY = json.aY

  	this.xRadius = json.xRadius
  	this.yRadius = json.yRadius

  	this.aStartAngle = json.aStartAngle
  	this.aEndAngle = json.aEndAngle

  	this.aClockwise = json.aClockwise

  	this.aRotation = json.aRotation

  	return this
  }

  function ArcCurve (aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise) {
  	EllipseCurve.call(this, aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise)

  	this.type = 'ArcCurve'
  }

  ArcCurve.prototype = Object.create(EllipseCurve.prototype)
  ArcCurve.prototype.constructor = ArcCurve

  ArcCurve.prototype.isArcCurve = true

  /**
   * @author zz85 https://github.com/zz85
   *
   * Centripetal CatmullRom Curve - which is useful for avoiding
   * cusps and self-intersections in non-uniform catmull rom curves.
   * http://www.cemyuksel.com/research/catmullrom_param/catmullrom.pdf
   *
   * curve.type accepts centripetal(default), chordal and catmullrom
   * curve.tension is used for catmullrom which defaults to 0.5
   */

  /*
  Based on an optimized c++ solution in
   - http://stackoverflow.com/questions/9489736/catmull-rom-curve-with-no-cusps-and-no-self-intersections/
   - http://ideone.com/NoEbVM

  This CubicPoly class could be used for reusing some variables and calculations,
  but for three.js curve use, it could be possible inlined and flatten into a single function call
  which can be placed in CurveUtils.
  */

  function CubicPoly () {
  	var c0 = 0; var c1 = 0; var c2 = 0; var c3 = 0

  	/*
  	 * Compute coefficients for a cubic polynomial
  	 *   p(s) = c0 + c1*s + c2*s^2 + c3*s^3
  	 * such that
  	 *   p(0) = x0, p(1) = x1
  	 *  and
  	 *   p'(0) = t0, p'(1) = t1.
  	 */
  	function init (x0, x1, t0, t1) {
  		c0 = x0
  		c1 = t0
  		c2 = -3 * x0 + 3 * x1 - 2 * t0 - t1
  		c3 = 2 * x0 - 2 * x1 + t0 + t1
  	}

  	return {

  		initCatmullRom: function (x0, x1, x2, x3, tension) {
  			init(x1, x2, tension * (x2 - x0), tension * (x3 - x1))
  		},

  		initNonuniformCatmullRom: function (x0, x1, x2, x3, dt0, dt1, dt2) {
  			// compute tangents when parameterized in [t1,t2]
  			var t1 = (x1 - x0) / dt0 - (x2 - x0) / (dt0 + dt1) + (x2 - x1) / dt1
  			var t2 = (x2 - x1) / dt1 - (x3 - x1) / (dt1 + dt2) + (x3 - x2) / dt2

  			// rescale tangents for parametrization in [0,1]
  			t1 *= dt1
  			t2 *= dt1

  			init(x1, x2, t1, t2)
  		},

  		calc: function (t) {
  			var t2 = t * t
  			var t3 = t2 * t
  			return c0 + c1 * t + c2 * t2 + c3 * t3
  		}

  	}
  }

  //

  var tmp = new Vector3()
  var px = new CubicPoly(); var py = new CubicPoly(); var pz = new CubicPoly()

  function CatmullRomCurve3 (points, closed, curveType, tension) {
  	Curve.call(this)

  	this.type = 'CatmullRomCurve3'

  	this.points = points || []
  	this.closed = closed || false
  	this.curveType = curveType || 'centripetal'
  	this.tension = tension || 0.5
  }

  CatmullRomCurve3.prototype = Object.create(Curve.prototype)
  CatmullRomCurve3.prototype.constructor = CatmullRomCurve3

  CatmullRomCurve3.prototype.isCatmullRomCurve3 = true

  CatmullRomCurve3.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector3()

  	var points = this.points
  	var l = points.length

  	var p = (l - (this.closed ? 0 : 1)) * t
  	var intPoint = Math.floor(p)
  	var weight = p - intPoint

  	if (this.closed) {
  		intPoint += intPoint > 0 ? 0 : (Math.floor(Math.abs(intPoint) / l) + 1) * l
  	} else if (weight === 0 && intPoint === l - 1) {
  		intPoint = l - 2
  		weight = 1
  	}

  	var p0, p1, p2, p3 // 4 points

  	if (this.closed || intPoint > 0) {
  		p0 = points[(intPoint - 1) % l]
  	} else {
  		// extrapolate first point
  		tmp.subVectors(points[0], points[1]).add(points[0])
  		p0 = tmp
  	}

  	p1 = points[intPoint % l]
  	p2 = points[(intPoint + 1) % l]

  	if (this.closed || intPoint + 2 < l) {
  		p3 = points[(intPoint + 2) % l]
  	} else {
  		// extrapolate last point
  		tmp.subVectors(points[l - 1], points[l - 2]).add(points[l - 1])
  		p3 = tmp
  	}

  	if (this.curveType === 'centripetal' || this.curveType === 'chordal') {
  		// init Centripetal / Chordal Catmull-Rom
  		var pow = this.curveType === 'chordal' ? 0.5 : 0.25
  		var dt0 = Math.pow(p0.distanceToSquared(p1), pow)
  		var dt1 = Math.pow(p1.distanceToSquared(p2), pow)
  		var dt2 = Math.pow(p2.distanceToSquared(p3), pow)

  		// safety check for repeated points
  		if (dt1 < 1e-4) dt1 = 1.0
  		if (dt0 < 1e-4) dt0 = dt1
  		if (dt2 < 1e-4) dt2 = dt1

  		px.initNonuniformCatmullRom(p0.x, p1.x, p2.x, p3.x, dt0, dt1, dt2)
  		py.initNonuniformCatmullRom(p0.y, p1.y, p2.y, p3.y, dt0, dt1, dt2)
  		pz.initNonuniformCatmullRom(p0.z, p1.z, p2.z, p3.z, dt0, dt1, dt2)
  	} else if (this.curveType === 'catmullrom') {
  		px.initCatmullRom(p0.x, p1.x, p2.x, p3.x, this.tension)
  		py.initCatmullRom(p0.y, p1.y, p2.y, p3.y, this.tension)
  		pz.initCatmullRom(p0.z, p1.z, p2.z, p3.z, this.tension)
  	}

  	point.set(
  		px.calc(weight),
  		py.calc(weight),
  		pz.calc(weight)
  	)

  	return point
  }

  CatmullRomCurve3.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.points = []

  	for (var i = 0, l = source.points.length; i < l; i++) {
  		var point = source.points[i]

  		this.points.push(point.clone())
  	}

  	this.closed = source.closed
  	this.curveType = source.curveType
  	this.tension = source.tension

  	return this
  }

  CatmullRomCurve3.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.points = []

  	for (var i = 0, l = this.points.length; i < l; i++) {
  		var point = this.points[i]
  		data.points.push(point.toArray())
  	}

  	data.closed = this.closed
  	data.curveType = this.curveType
  	data.tension = this.tension

  	return data
  }

  CatmullRomCurve3.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.points = []

  	for (var i = 0, l = json.points.length; i < l; i++) {
  		var point = json.points[i]
  		this.points.push(new Vector3().fromArray(point))
  	}

  	this.closed = json.closed
  	this.curveType = json.curveType
  	this.tension = json.tension

  	return this
  }

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   *
   * Bezier Curves formulas obtained from
   * http://en.wikipedia.org/wiki/Bézier_curve
   */

  function CatmullRom (t, p0, p1, p2, p3) {
  	var v0 = (p2 - p0) * 0.5
  	var v1 = (p3 - p1) * 0.5
  	var t2 = t * t
  	var t3 = t * t2
  	return (2 * p1 - 2 * p2 + v0 + v1) * t3 + (-3 * p1 + 3 * p2 - 2 * v0 - v1) * t2 + v0 * t + p1
  }

  //

  function QuadraticBezierP0 (t, p) {
  	var k = 1 - t
  	return k * k * p
  }

  function QuadraticBezierP1 (t, p) {
  	return 2 * (1 - t) * t * p
  }

  function QuadraticBezierP2 (t, p) {
  	return t * t * p
  }

  function QuadraticBezier (t, p0, p1, p2) {
  	return QuadraticBezierP0(t, p0) + QuadraticBezierP1(t, p1) +
  		QuadraticBezierP2(t, p2)
  }

  //

  function CubicBezierP0 (t, p) {
  	var k = 1 - t
  	return k * k * k * p
  }

  function CubicBezierP1 (t, p) {
  	var k = 1 - t
  	return 3 * k * k * t * p
  }

  function CubicBezierP2 (t, p) {
  	return 3 * (1 - t) * t * t * p
  }

  function CubicBezierP3 (t, p) {
  	return t * t * t * p
  }

  function CubicBezier (t, p0, p1, p2, p3) {
  	return CubicBezierP0(t, p0) + CubicBezierP1(t, p1) + CubicBezierP2(t, p2) +
  		CubicBezierP3(t, p3)
  }

  function CubicBezierCurve (v0, v1, v2, v3) {
  	Curve.call(this)

  	this.type = 'CubicBezierCurve'

  	this.v0 = v0 || new Vector2()
  	this.v1 = v1 || new Vector2()
  	this.v2 = v2 || new Vector2()
  	this.v3 = v3 || new Vector2()
  }

  CubicBezierCurve.prototype = Object.create(Curve.prototype)
  CubicBezierCurve.prototype.constructor = CubicBezierCurve

  CubicBezierCurve.prototype.isCubicBezierCurve = true

  CubicBezierCurve.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector2()

  	var v0 = this.v0; var v1 = this.v1; var v2 = this.v2; var v3 = this.v3

  	point.set(
  		CubicBezier(t, v0.x, v1.x, v2.x, v3.x),
  		CubicBezier(t, v0.y, v1.y, v2.y, v3.y)
  	)

  	return point
  }

  CubicBezierCurve.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.v0.copy(source.v0)
  	this.v1.copy(source.v1)
  	this.v2.copy(source.v2)
  	this.v3.copy(source.v3)

  	return this
  }

  CubicBezierCurve.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.v0 = this.v0.toArray()
  	data.v1 = this.v1.toArray()
  	data.v2 = this.v2.toArray()
  	data.v3 = this.v3.toArray()

  	return data
  }

  CubicBezierCurve.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.v0.fromArray(json.v0)
  	this.v1.fromArray(json.v1)
  	this.v2.fromArray(json.v2)
  	this.v3.fromArray(json.v3)

  	return this
  }

  function CubicBezierCurve3 (v0, v1, v2, v3) {
  	Curve.call(this)

  	this.type = 'CubicBezierCurve3'

  	this.v0 = v0 || new Vector3()
  	this.v1 = v1 || new Vector3()
  	this.v2 = v2 || new Vector3()
  	this.v3 = v3 || new Vector3()
  }

  CubicBezierCurve3.prototype = Object.create(Curve.prototype)
  CubicBezierCurve3.prototype.constructor = CubicBezierCurve3

  CubicBezierCurve3.prototype.isCubicBezierCurve3 = true

  CubicBezierCurve3.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector3()

  	var v0 = this.v0; var v1 = this.v1; var v2 = this.v2; var v3 = this.v3

  	point.set(
  		CubicBezier(t, v0.x, v1.x, v2.x, v3.x),
  		CubicBezier(t, v0.y, v1.y, v2.y, v3.y),
  		CubicBezier(t, v0.z, v1.z, v2.z, v3.z)
  	)

  	return point
  }

  CubicBezierCurve3.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.v0.copy(source.v0)
  	this.v1.copy(source.v1)
  	this.v2.copy(source.v2)
  	this.v3.copy(source.v3)

  	return this
  }

  CubicBezierCurve3.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.v0 = this.v0.toArray()
  	data.v1 = this.v1.toArray()
  	data.v2 = this.v2.toArray()
  	data.v3 = this.v3.toArray()

  	return data
  }

  CubicBezierCurve3.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.v0.fromArray(json.v0)
  	this.v1.fromArray(json.v1)
  	this.v2.fromArray(json.v2)
  	this.v3.fromArray(json.v3)

  	return this
  }

  function LineCurve (v1, v2) {
  	Curve.call(this)

  	this.type = 'LineCurve'

  	this.v1 = v1 || new Vector2()
  	this.v2 = v2 || new Vector2()
  }

  LineCurve.prototype = Object.create(Curve.prototype)
  LineCurve.prototype.constructor = LineCurve

  LineCurve.prototype.isLineCurve = true

  LineCurve.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector2()

  	if (t === 1) {
  		point.copy(this.v2)
  	} else {
  		point.copy(this.v2).sub(this.v1)
  		point.multiplyScalar(t).add(this.v1)
  	}

  	return point
  }

  // Line curve is linear, so we can overwrite default getPointAt

  LineCurve.prototype.getPointAt = function (u, optionalTarget) {
  	return this.getPoint(u, optionalTarget)
  }

  LineCurve.prototype.getTangent = function (/* t */) {
  	var tangent = this.v2.clone().sub(this.v1)

  	return tangent.normalize()
  }

  LineCurve.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.v1.copy(source.v1)
  	this.v2.copy(source.v2)

  	return this
  }

  LineCurve.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.v1 = this.v1.toArray()
  	data.v2 = this.v2.toArray()

  	return data
  }

  LineCurve.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.v1.fromArray(json.v1)
  	this.v2.fromArray(json.v2)

  	return this
  }

  function LineCurve3 (v1, v2) {
  	Curve.call(this)

  	this.type = 'LineCurve3'

  	this.v1 = v1 || new Vector3()
  	this.v2 = v2 || new Vector3()
  }

  LineCurve3.prototype = Object.create(Curve.prototype)
  LineCurve3.prototype.constructor = LineCurve3

  LineCurve3.prototype.isLineCurve3 = true

  LineCurve3.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector3()

  	if (t === 1) {
  		point.copy(this.v2)
  	} else {
  		point.copy(this.v2).sub(this.v1)
  		point.multiplyScalar(t).add(this.v1)
  	}

  	return point
  }

  // Line curve is linear, so we can overwrite default getPointAt

  LineCurve3.prototype.getPointAt = function (u, optionalTarget) {
  	return this.getPoint(u, optionalTarget)
  }

  LineCurve3.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.v1.copy(source.v1)
  	this.v2.copy(source.v2)

  	return this
  }

  LineCurve3.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.v1 = this.v1.toArray()
  	data.v2 = this.v2.toArray()

  	return data
  }

  LineCurve3.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.v1.fromArray(json.v1)
  	this.v2.fromArray(json.v2)

  	return this
  }

  function QuadraticBezierCurve (v0, v1, v2) {
  	Curve.call(this)

  	this.type = 'QuadraticBezierCurve'

  	this.v0 = v0 || new Vector2()
  	this.v1 = v1 || new Vector2()
  	this.v2 = v2 || new Vector2()
  }

  QuadraticBezierCurve.prototype = Object.create(Curve.prototype)
  QuadraticBezierCurve.prototype.constructor = QuadraticBezierCurve

  QuadraticBezierCurve.prototype.isQuadraticBezierCurve = true

  QuadraticBezierCurve.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector2()

  	var v0 = this.v0; var v1 = this.v1; var v2 = this.v2

  	point.set(
  		QuadraticBezier(t, v0.x, v1.x, v2.x),
  		QuadraticBezier(t, v0.y, v1.y, v2.y)
  	)

  	return point
  }

  QuadraticBezierCurve.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.v0.copy(source.v0)
  	this.v1.copy(source.v1)
  	this.v2.copy(source.v2)

  	return this
  }

  QuadraticBezierCurve.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.v0 = this.v0.toArray()
  	data.v1 = this.v1.toArray()
  	data.v2 = this.v2.toArray()

  	return data
  }

  QuadraticBezierCurve.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.v0.fromArray(json.v0)
  	this.v1.fromArray(json.v1)
  	this.v2.fromArray(json.v2)

  	return this
  }

  function QuadraticBezierCurve3 (v0, v1, v2) {
  	Curve.call(this)

  	this.type = 'QuadraticBezierCurve3'

  	this.v0 = v0 || new Vector3()
  	this.v1 = v1 || new Vector3()
  	this.v2 = v2 || new Vector3()
  }

  QuadraticBezierCurve3.prototype = Object.create(Curve.prototype)
  QuadraticBezierCurve3.prototype.constructor = QuadraticBezierCurve3

  QuadraticBezierCurve3.prototype.isQuadraticBezierCurve3 = true

  QuadraticBezierCurve3.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector3()

  	var v0 = this.v0; var v1 = this.v1; var v2 = this.v2

  	point.set(
  		QuadraticBezier(t, v0.x, v1.x, v2.x),
  		QuadraticBezier(t, v0.y, v1.y, v2.y),
  		QuadraticBezier(t, v0.z, v1.z, v2.z)
  	)

  	return point
  }

  QuadraticBezierCurve3.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.v0.copy(source.v0)
  	this.v1.copy(source.v1)
  	this.v2.copy(source.v2)

  	return this
  }

  QuadraticBezierCurve3.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.v0 = this.v0.toArray()
  	data.v1 = this.v1.toArray()
  	data.v2 = this.v2.toArray()

  	return data
  }

  QuadraticBezierCurve3.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.v0.fromArray(json.v0)
  	this.v1.fromArray(json.v1)
  	this.v2.fromArray(json.v2)

  	return this
  }

  function SplineCurve (points /* array of Vector2 */) {
  	Curve.call(this)

  	this.type = 'SplineCurve'

  	this.points = points || []
  }

  SplineCurve.prototype = Object.create(Curve.prototype)
  SplineCurve.prototype.constructor = SplineCurve

  SplineCurve.prototype.isSplineCurve = true

  SplineCurve.prototype.getPoint = function (t, optionalTarget) {
  	var point = optionalTarget || new Vector2()

  	var points = this.points
  	var p = (points.length - 1) * t

  	var intPoint = Math.floor(p)
  	var weight = p - intPoint

  	var p0 = points[intPoint === 0 ? intPoint : intPoint - 1]
  	var p1 = points[intPoint]
  	var p2 = points[intPoint > points.length - 2 ? points.length - 1 : intPoint + 1]
  	var p3 = points[intPoint > points.length - 3 ? points.length - 1 : intPoint + 2]

  	point.set(
  		CatmullRom(weight, p0.x, p1.x, p2.x, p3.x),
  		CatmullRom(weight, p0.y, p1.y, p2.y, p3.y)
  	)

  	return point
  }

  SplineCurve.prototype.copy = function (source) {
  	Curve.prototype.copy.call(this, source)

  	this.points = []

  	for (var i = 0, l = source.points.length; i < l; i++) {
  		var point = source.points[i]

  		this.points.push(point.clone())
  	}

  	return this
  }

  SplineCurve.prototype.toJSON = function () {
  	var data = Curve.prototype.toJSON.call(this)

  	data.points = []

  	for (var i = 0, l = this.points.length; i < l; i++) {
  		var point = this.points[i]
  		data.points.push(point.toArray())
  	}

  	return data
  }

  SplineCurve.prototype.fromJSON = function (json) {
  	Curve.prototype.fromJSON.call(this, json)

  	this.points = []

  	for (var i = 0, l = json.points.length; i < l; i++) {
  		var point = json.points[i]
  		this.points.push(new Vector2().fromArray(point))
  	}

  	return this
  }

  var Curves = /* #__PURE__ */Object.freeze({
  	ArcCurve: ArcCurve,
  	CatmullRomCurve3: CatmullRomCurve3,
  	CubicBezierCurve: CubicBezierCurve,
  	CubicBezierCurve3: CubicBezierCurve3,
  	EllipseCurve: EllipseCurve,
  	LineCurve: LineCurve,
  	LineCurve3: LineCurve3,
  	QuadraticBezierCurve: QuadraticBezierCurve,
  	QuadraticBezierCurve3: QuadraticBezierCurve3,
  	SplineCurve: SplineCurve
  })

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   *
   **/

  /**************************************************************
   *	Curved Path - a curve path is simply a array of connected
   *  curves, but retains the api of a curve
   **************************************************************/

  function CurvePath () {
  	Curve.call(this)

  	this.type = 'CurvePath'

  	this.curves = []
  	this.autoClose = false // Automatically closes the path
  }

  CurvePath.prototype = Object.assign(Object.create(Curve.prototype), {

  	constructor: CurvePath,

  	add: function (curve) {
  		this.curves.push(curve)
  	},

  	closePath: function () {
  		// Add a line curve if start and end of lines are not connected
  		var startPoint = this.curves[0].getPoint(0)
  		var endPoint = this.curves[this.curves.length - 1].getPoint(1)

  		if (!startPoint.equals(endPoint)) {
  			this.curves.push(new LineCurve(endPoint, startPoint))
  		}
  	},

  	// To get accurate point with reference to
  	// entire path distance at time t,
  	// following has to be done:

  	// 1. Length of each sub path have to be known
  	// 2. Locate and identify type of curve
  	// 3. Get t for the curve
  	// 4. Return curve.getPointAt(t')

  	getPoint: function (t) {
  		var d = t * this.getLength()
  		var curveLengths = this.getCurveLengths()
  		var i = 0

  		// To think about boundaries points.

  		while (i < curveLengths.length) {
  			if (curveLengths[i] >= d) {
  				var diff = curveLengths[i] - d
  				var curve = this.curves[i]

  				var segmentLength = curve.getLength()
  				var u = segmentLength === 0 ? 0 : 1 - diff / segmentLength

  				return curve.getPointAt(u)
  			}

  			i++
  		}

  		return null

  		// loop where sum != 0, sum > d , sum+1 <d
  	},

  	// We cannot use the default THREE.Curve getPoint() with getLength() because in
  	// THREE.Curve, getLength() depends on getPoint() but in THREE.CurvePath
  	// getPoint() depends on getLength

  	getLength: function () {
  		var lens = this.getCurveLengths()
  		return lens[lens.length - 1]
  	},

  	// cacheLengths must be recalculated.
  	updateArcLengths: function () {
  		this.needsUpdate = true
  		this.cacheLengths = null
  		this.getCurveLengths()
  	},

  	// Compute lengths and cache them
  	// We cannot overwrite getLengths() because UtoT mapping uses it.

  	getCurveLengths: function () {
  		// We use cache values if curves and cache array are same length

  		if (this.cacheLengths && this.cacheLengths.length === this.curves.length) {
  			return this.cacheLengths
  		}

  		// Get length of sub-curve
  		// Push sums into cached array

  		var lengths = []; var sums = 0

  		for (var i = 0, l = this.curves.length; i < l; i++) {
  			sums += this.curves[i].getLength()
  			lengths.push(sums)
  		}

  		this.cacheLengths = lengths

  		return lengths
  	},

  	getSpacedPoints: function (divisions) {
  		if (divisions === undefined) divisions = 40

  		var points = []

  		for (var i = 0; i <= divisions; i++) {
  			points.push(this.getPoint(i / divisions))
  		}

  		if (this.autoClose) {
  			points.push(points[0])
  		}

  		return points
  	},

  	getPoints: function (divisions) {
  		divisions = divisions || 12

  		var points = []; var last

  		for (var i = 0, curves = this.curves; i < curves.length; i++) {
  			var curve = curves[i]
  			var resolution = (curve && curve.isEllipseCurve) ? divisions * 2
  				: (curve && curve.isLineCurve) ? 1
  					: (curve && curve.isSplineCurve) ? divisions * curve.points.length
  						: divisions

  			var pts = curve.getPoints(resolution)

  			for (var j = 0; j < pts.length; j++) {
  				var point = pts[j]

  				if (last && last.equals(point)) continue // ensures no consecutive points are duplicates

  				points.push(point)
  				last = point
  			}
  		}

  		if (this.autoClose && points.length > 1 && !points[points.length - 1].equals(points[0])) {
  			points.push(points[0])
  		}

  		return points
  	},

  	copy: function (source) {
  		Curve.prototype.copy.call(this, source)

  		this.curves = []

  		for (var i = 0, l = source.curves.length; i < l; i++) {
  			var curve = source.curves[i]

  			this.curves.push(curve.clone())
  		}

  		this.autoClose = source.autoClose

  		return this
  	},

  	toJSON: function () {
  		var data = Curve.prototype.toJSON.call(this)

  		data.autoClose = this.autoClose
  		data.curves = []

  		for (var i = 0, l = this.curves.length; i < l; i++) {
  			var curve = this.curves[i]
  			data.curves.push(curve.toJSON())
  		}

  		return data
  	},

  	fromJSON: function (json) {
  		Curve.prototype.fromJSON.call(this, json)

  		this.autoClose = json.autoClose
  		this.curves = []

  		for (var i = 0, l = json.curves.length; i < l; i++) {
  			var curve = json.curves[i]
  			this.curves.push(new Curves[curve.type]().fromJSON(curve))
  		}

  		return this
  	}

  })

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   * Creates free form 2d path using series of points, lines or curves.
   **/

  function Path (points) {
  	CurvePath.call(this)

  	this.type = 'Path'

  	this.currentPoint = new Vector2()

  	if (points) {
  		this.setFromPoints(points)
  	}
  }

  Path.prototype = Object.assign(Object.create(CurvePath.prototype), {

  	constructor: Path,

  	setFromPoints: function (points) {
  		this.moveTo(points[0].x, points[0].y)

  		for (var i = 1, l = points.length; i < l; i++) {
  			this.lineTo(points[i].x, points[i].y)
  		}
  	},

  	moveTo: function (x, y) {
  		this.currentPoint.set(x, y) // TODO consider referencing vectors instead of copying?
  	},

  	lineTo: function (x, y) {
  		var curve = new LineCurve(this.currentPoint.clone(), new Vector2(x, y))
  		this.curves.push(curve)

  		this.currentPoint.set(x, y)
  	},

  	quadraticCurveTo: function (aCPx, aCPy, aX, aY) {
  		var curve = new QuadraticBezierCurve(
  			this.currentPoint.clone(),
  			new Vector2(aCPx, aCPy),
  			new Vector2(aX, aY)
  		)

  		this.curves.push(curve)

  		this.currentPoint.set(aX, aY)
  	},

  	bezierCurveTo: function (aCP1x, aCP1y, aCP2x, aCP2y, aX, aY) {
  		var curve = new CubicBezierCurve(
  			this.currentPoint.clone(),
  			new Vector2(aCP1x, aCP1y),
  			new Vector2(aCP2x, aCP2y),
  			new Vector2(aX, aY)
  		)

  		this.curves.push(curve)

  		this.currentPoint.set(aX, aY)
  	},

  	splineThru: function (pts /* Array of Vector */) {
  		var npts = [this.currentPoint.clone()].concat(pts)

  		var curve = new SplineCurve(npts)
  		this.curves.push(curve)

  		this.currentPoint.copy(pts[pts.length - 1])
  	},

  	arc: function (aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise) {
  		var x0 = this.currentPoint.x
  		var y0 = this.currentPoint.y

  		this.absarc(aX + x0, aY + y0, aRadius,
  			aStartAngle, aEndAngle, aClockwise)
  	},

  	absarc: function (aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise) {
  		this.absellipse(aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise)
  	},

  	ellipse: function (aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation) {
  		var x0 = this.currentPoint.x
  		var y0 = this.currentPoint.y

  		this.absellipse(aX + x0, aY + y0, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation)
  	},

  	absellipse: function (aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation) {
  		var curve = new EllipseCurve(aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise, aRotation)

  		if (this.curves.length > 0) {
  			// if a previous curve is present, attempt to join
  			var firstPoint = curve.getPoint(0)

  			if (!firstPoint.equals(this.currentPoint)) {
  				this.lineTo(firstPoint.x, firstPoint.y)
  			}
  		}

  		this.curves.push(curve)

  		var lastPoint = curve.getPoint(1)
  		this.currentPoint.copy(lastPoint)
  	},

  	copy: function (source) {
  		CurvePath.prototype.copy.call(this, source)

  		this.currentPoint.copy(source.currentPoint)

  		return this
  	},

  	toJSON: function () {
  		var data = CurvePath.prototype.toJSON.call(this)

  		data.currentPoint = this.currentPoint.toArray()

  		return data
  	},

  	fromJSON: function (json) {
  		CurvePath.prototype.fromJSON.call(this, json)

  		this.currentPoint.fromArray(json.currentPoint)

  		return this
  	}

  })

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   * Defines a 2d shape plane using paths.
   **/

  // STEP 1 Create a path.
  // STEP 2 Turn path into shape.
  // STEP 3 ExtrudeGeometry takes in Shape/Shapes
  // STEP 3a - Extract points from each shape, turn to vertices
  // STEP 3b - Triangulate each shape, add faces.

  function Shape (points) {
  	Path.call(this, points)

  	this.uuid = _Math.generateUUID()

  	this.type = 'Shape'

  	this.holes = []
  }

  Shape.prototype = Object.assign(Object.create(Path.prototype), {

  	constructor: Shape,

  	getPointsHoles: function (divisions) {
  		var holesPts = []

  		for (var i = 0, l = this.holes.length; i < l; i++) {
  			holesPts[i] = this.holes[i].getPoints(divisions)
  		}

  		return holesPts
  	},

  	// get points of shape and holes (keypoints based on segments parameter)

  	extractPoints: function (divisions) {
  		return {

  			shape: this.getPoints(divisions),
  			holes: this.getPointsHoles(divisions)

  		}
  	},

  	copy: function (source) {
  		Path.prototype.copy.call(this, source)

  		this.holes = []

  		for (var i = 0, l = source.holes.length; i < l; i++) {
  			var hole = source.holes[i]

  			this.holes.push(hole.clone())
  		}

  		return this
  	},

  	toJSON: function () {
  		var data = Path.prototype.toJSON.call(this)

  		data.uuid = this.uuid
  		data.holes = []

  		for (var i = 0, l = this.holes.length; i < l; i++) {
  			var hole = this.holes[i]
  			data.holes.push(hole.toJSON())
  		}

  		return data
  	},

  	fromJSON: function (json) {
  		Path.prototype.fromJSON.call(this, json)

  		this.uuid = json.uuid
  		this.holes = []

  		for (var i = 0, l = json.holes.length; i < l; i++) {
  			var hole = json.holes[i]
  			this.holes.push(new Path().fromJSON(hole))
  		}

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   */

  function Light (color, intensity) {
  	Object3D.call(this)

  	this.type = 'Light'

  	this.color = new Color(color)
  	this.intensity = intensity !== undefined ? intensity : 1

  	this.receiveShadow = undefined
  }

  Light.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Light,

  	isLight: true,

  	copy: function (source) {
  		Object3D.prototype.copy.call(this, source)

  		this.color.copy(source.color)
  		this.intensity = source.intensity

  		return this
  	},

  	toJSON: function (meta) {
  		var data = Object3D.prototype.toJSON.call(this, meta)

  		data.object.color = this.color.getHex()
  		data.object.intensity = this.intensity

  		if (this.groundColor !== undefined) data.object.groundColor = this.groundColor.getHex()

  		if (this.distance !== undefined) data.object.distance = this.distance
  		if (this.angle !== undefined) data.object.angle = this.angle
  		if (this.decay !== undefined) data.object.decay = this.decay
  		if (this.penumbra !== undefined) data.object.penumbra = this.penumbra

  		if (this.shadow !== undefined) data.object.shadow = this.shadow.toJSON()

  		return data
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com/
   */

  function HemisphereLight (skyColor, groundColor, intensity) {
  	Light.call(this, skyColor, intensity)

  	this.type = 'HemisphereLight'

  	this.castShadow = undefined

  	this.position.copy(Object3D.DefaultUp)
  	this.updateMatrix()

  	this.groundColor = new Color(groundColor)
  }

  HemisphereLight.prototype = Object.assign(Object.create(Light.prototype), {

  	constructor: HemisphereLight,

  	isHemisphereLight: true,

  	copy: function (source) {
  		Light.prototype.copy.call(this, source)

  		this.groundColor.copy(source.groundColor)

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function LightShadow (camera) {
  	this.camera = camera

  	this.bias = 0
  	this.radius = 1

  	this.mapSize = new Vector2(512, 512)

  	this.map = null
  	this.matrix = new Matrix4()
  }

  Object.assign(LightShadow.prototype, {

  	copy: function (source) {
  		this.camera = source.camera.clone()

  		this.bias = source.bias
  		this.radius = source.radius

  		this.mapSize.copy(source.mapSize)

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	toJSON: function () {
  		var object = {}

  		if (this.bias !== 0) object.bias = this.bias
  		if (this.radius !== 1) object.radius = this.radius
  		if (this.mapSize.x !== 512 || this.mapSize.y !== 512) object.mapSize = this.mapSize.toArray()

  		object.camera = this.camera.toJSON(false).object
  		delete object.camera.matrix

  		return object
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function SpotLightShadow () {
  	LightShadow.call(this, new PerspectiveCamera(50, 1, 0.5, 500))
  }

  SpotLightShadow.prototype = Object.assign(Object.create(LightShadow.prototype), {

  	constructor: SpotLightShadow,

  	isSpotLightShadow: true,

  	update: function (light) {
  		var camera = this.camera

  		var fov = _Math.RAD2DEG * 2 * light.angle
  		var aspect = this.mapSize.width / this.mapSize.height
  		var far = light.distance || camera.far

  		if (fov !== camera.fov || aspect !== camera.aspect || far !== camera.far) {
  			camera.fov = fov
  			camera.aspect = aspect
  			camera.far = far
  			camera.updateProjectionMatrix()
  		}
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com/
   */

  function SpotLight (color, intensity, distance, angle, penumbra, decay) {
  	Light.call(this, color, intensity)

  	this.type = 'SpotLight'

  	this.position.copy(Object3D.DefaultUp)
  	this.updateMatrix()

  	this.target = new Object3D()

  	Object.defineProperty(this, 'power', {
  		get: function () {
  			// intensity = power per solid angle.
  			// ref: equation (17) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
  			return this.intensity * Math.PI
  		},
  		set: function (power) {
  			// intensity = power per solid angle.
  			// ref: equation (17) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
  			this.intensity = power / Math.PI
  		}
  	})

  	this.distance = (distance !== undefined) ? distance : 0
  	this.angle = (angle !== undefined) ? angle : Math.PI / 3
  	this.penumbra = (penumbra !== undefined) ? penumbra : 0
  	this.decay = (decay !== undefined) ? decay : 1	// for physically correct lights, should be 2.

  	this.shadow = new SpotLightShadow()
  }

  SpotLight.prototype = Object.assign(Object.create(Light.prototype), {

  	constructor: SpotLight,

  	isSpotLight: true,

  	copy: function (source) {
  		Light.prototype.copy.call(this, source)

  		this.distance = source.distance
  		this.angle = source.angle
  		this.penumbra = source.penumbra
  		this.decay = source.decay

  		this.target = source.target.clone()

  		this.shadow = source.shadow.clone()

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function PointLight (color, intensity, distance, decay) {
  	Light.call(this, color, intensity)

  	this.type = 'PointLight'

  	Object.defineProperty(this, 'power', {
  		get: function () {
  			// intensity = power per solid angle.
  			// ref: equation (15) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
  			return this.intensity * 4 * Math.PI
  		},
  		set: function (power) {
  			// intensity = power per solid angle.
  			// ref: equation (15) from https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
  			this.intensity = power / (4 * Math.PI)
  		}
  	})

  	this.distance = (distance !== undefined) ? distance : 0
  	this.decay = (decay !== undefined) ? decay : 1	// for physically correct lights, should be 2.

  	this.shadow = new LightShadow(new PerspectiveCamera(90, 1, 0.5, 500))
  }

  PointLight.prototype = Object.assign(Object.create(Light.prototype), {

  	constructor: PointLight,

  	isPointLight: true,

  	copy: function (source) {
  		Light.prototype.copy.call(this, source)

  		this.distance = source.distance
  		this.decay = source.decay

  		this.shadow = source.shadow.clone()

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function DirectionalLightShadow () {
  	LightShadow.call(this, new OrthographicCamera(-5, 5, 5, -5, 0.5, 500))
  }

  DirectionalLightShadow.prototype = Object.assign(Object.create(LightShadow.prototype), {

  	constructor: DirectionalLightShadow

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   */

  function DirectionalLight (color, intensity) {
  	Light.call(this, color, intensity)

  	this.type = 'DirectionalLight'

  	this.position.copy(Object3D.DefaultUp)
  	this.updateMatrix()

  	this.target = new Object3D()

  	this.shadow = new DirectionalLightShadow()
  }

  DirectionalLight.prototype = Object.assign(Object.create(Light.prototype), {

  	constructor: DirectionalLight,

  	isDirectionalLight: true,

  	copy: function (source) {
  		Light.prototype.copy.call(this, source)

  		this.target = source.target.clone()

  		this.shadow = source.shadow.clone()

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function AmbientLight (color, intensity) {
  	Light.call(this, color, intensity)

  	this.type = 'AmbientLight'

  	this.castShadow = undefined
  }

  AmbientLight.prototype = Object.assign(Object.create(Light.prototype), {

  	constructor: AmbientLight,

  	isAmbientLight: true

  })

  /**
   * @author abelnation / http://github.com/abelnation
   */

  function RectAreaLight (color, intensity, width, height) {
  	Light.call(this, color, intensity)

  	this.type = 'RectAreaLight'

  	this.width = (width !== undefined) ? width : 10
  	this.height = (height !== undefined) ? height : 10
  }

  RectAreaLight.prototype = Object.assign(Object.create(Light.prototype), {

  	constructor: RectAreaLight,

  	isRectAreaLight: true,

  	copy: function (source) {
  		Light.prototype.copy.call(this, source)

  		this.width = source.width
  		this.height = source.height

  		return this
  	},

  	toJSON: function (meta) {
  		var data = Light.prototype.toJSON.call(this, meta)

  		data.object.width = this.width
  		data.object.height = this.height

  		return data
  	}

  })

  /**
   *
   * A Track that interpolates Strings
   *
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function StringKeyframeTrack (name, times, values, interpolation) {
  	KeyframeTrack.call(this, name, times, values, interpolation)
  }

  StringKeyframeTrack.prototype = Object.assign(Object.create(KeyframeTrack.prototype), {

  	constructor: StringKeyframeTrack,

  	ValueTypeName: 'string',
  	ValueBufferType: Array,

  	DefaultInterpolation: InterpolateDiscrete,

  	InterpolantFactoryMethodLinear: undefined,

  	InterpolantFactoryMethodSmooth: undefined

  })

  /**
   *
   * A Track of Boolean keyframe values.
   *
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function BooleanKeyframeTrack (name, times, values) {
  	KeyframeTrack.call(this, name, times, values)
  }

  BooleanKeyframeTrack.prototype = Object.assign(Object.create(KeyframeTrack.prototype), {

  	constructor: BooleanKeyframeTrack,

  	ValueTypeName: 'bool',
  	ValueBufferType: Array,

  	DefaultInterpolation: InterpolateDiscrete,

  	InterpolantFactoryMethodLinear: undefined,
  	InterpolantFactoryMethodSmooth: undefined

  	// Note: Actually this track could have a optimized / compressed
  	// representation of a single value and a custom interpolant that
  	// computes "firstValue ^ isOdd( index )".

  })

  /**
   * Abstract base class of interpolants over parametric samples.
   *
   * The parameter domain is one dimensional, typically the time or a path
   * along a curve defined by the data.
   *
   * The sample values can have any dimensionality and derived classes may
   * apply special interpretations to the data.
   *
   * This class provides the interval seek in a Template Method, deferring
   * the actual interpolation to derived classes.
   *
   * Time complexity is O(1) for linear access crossing at most two points
   * and O(log N) for random access, where N is the number of positions.
   *
   * References:
   *
   * 		http://www.oodesign.com/template-method-pattern.html
   *
   * @author tschw
   */

  function Interpolant (parameterPositions, sampleValues, sampleSize, resultBuffer) {
  	this.parameterPositions = parameterPositions
  	this._cachedIndex = 0

  	this.resultBuffer = resultBuffer !== undefined
  		? resultBuffer : new sampleValues.constructor(sampleSize)
  	this.sampleValues = sampleValues
  	this.valueSize = sampleSize
  }

  Object.assign(Interpolant.prototype, {

  	evaluate: function (t) {
  		var pp = this.parameterPositions
  			var i1 = this._cachedIndex

  			var t1 = pp[i1]
  			var t0 = pp[i1 - 1]

  		validate_interval: {
  			seek: {
  				var right

  				linear_scan: {
  					// - See http://jsperf.com/comparison-to-undefined/3
  					// - slower code:
  					// -
  					// - 				if ( t >= t1 || t1 === undefined ) {
  					forward_scan: if (!(t < t1)) {
  						for (var giveUpAt = i1 + 2; ;) {
  							if (t1 === undefined) {
  								if (t < t0) break forward_scan

  								// after end

  								i1 = pp.length
  								this._cachedIndex = i1
  								return this.afterEnd_(i1 - 1, t, t0)
  							}

  							if (i1 === giveUpAt) break // this loop

  							t0 = t1
  							t1 = pp[++i1]

  							if (t < t1) {
  								// we have arrived at the sought interval
  								break seek
  							}
  						}

  						// prepare binary search on the right side of the index
  						right = pp.length
  						break linear_scan
  					}

  					// - slower code:
  					// -					if ( t < t0 || t0 === undefined ) {
  					if (!(t >= t0)) {
  						// looping?

  						var t1global = pp[1]

  						if (t < t1global) {
  							i1 = 2 // + 1, using the scan for the details
  							t0 = t1global
  						}

  						// linear reverse scan

  						for (var giveUpAt = i1 - 2; ;) {
  							if (t0 === undefined) {
  								// before start

  								this._cachedIndex = 0
  								return this.beforeStart_(0, t, t1)
  							}

  							if (i1 === giveUpAt) break // this loop

  							t1 = t0
  							t0 = pp[--i1 - 1]

  							if (t >= t0) {
  								// we have arrived at the sought interval
  								break seek
  							}
  						}

  						// prepare binary search on the left side of the index
  						right = i1
  						i1 = 0
  						break linear_scan
  					}

  					// the interval is valid

  					break validate_interval
  				} // linear scan

  				// binary search

  				while (i1 < right) {
  					var mid = (i1 + right) >>> 1

  					if (t < pp[mid]) {
  						right = mid
  					} else {
  						i1 = mid + 1
  					}
  				}

  				t1 = pp[i1]
  				t0 = pp[i1 - 1]

  				// check boundary cases, again

  				if (t0 === undefined) {
  					this._cachedIndex = 0
  					return this.beforeStart_(0, t, t1)
  				}

  				if (t1 === undefined) {
  					i1 = pp.length
  					this._cachedIndex = i1
  					return this.afterEnd_(i1 - 1, t0, t)
  				}
  			} // seek

  			this._cachedIndex = i1

  			this.intervalChanged_(i1, t0, t1)
  		} // validate_interval

  		return this.interpolate_(i1, t0, t, t1)
  	},

  	settings: null, // optional, subclass-specific settings structure
  	// Note: The indirection allows central control of many interpolants.

  	// --- Protected interface

  	DefaultSettings_: {},

  	getSettings_: function () {
  		return this.settings || this.DefaultSettings_
  	},

  	copySampleValue_: function (index) {
  		// copies a sample value to the result buffer

  		var result = this.resultBuffer
  			var values = this.sampleValues
  			var stride = this.valueSize
  			var offset = index * stride

  		for (var i = 0; i !== stride; ++i) {
  			result[i] = values[offset + i]
  		}

  		return result
  	},

  	// Template methods for derived classes:

  	interpolate_: function (/* i1, t0, t, t1 */) {
  		throw new Error('call to abstract method')
  		// implementations shall return this.resultBuffer
  	},

  	intervalChanged_: function (/* i1, t0, t1 */) {

  		// empty

  	}

  })

  //! \ DECLARE ALIAS AFTER assign prototype !
  Object.assign(Interpolant.prototype, {

  	// ( 0, t, t0 ), returns this.resultBuffer
  	beforeStart_: Interpolant.prototype.copySampleValue_,

  	// ( N-1, tN-1, t ), returns this.resultBuffer
  	afterEnd_: Interpolant.prototype.copySampleValue_

  })

  /**
   * Spherical linear unit quaternion interpolant.
   *
   * @author tschw
   */

  function QuaternionLinearInterpolant (parameterPositions, sampleValues, sampleSize, resultBuffer) {
  	Interpolant.call(this, parameterPositions, sampleValues, sampleSize, resultBuffer)
  }

  QuaternionLinearInterpolant.prototype = Object.assign(Object.create(Interpolant.prototype), {

  	constructor: QuaternionLinearInterpolant,

  	interpolate_: function (i1, t0, t, t1) {
  		var result = this.resultBuffer
  			var values = this.sampleValues
  			var stride = this.valueSize

  			var offset = i1 * stride

  			var alpha = (t - t0) / (t1 - t0)

  		for (var end = offset + stride; offset !== end; offset += 4) {
  			Quaternion.slerpFlat(result, 0, values, offset - stride, values, offset, alpha)
  		}

  		return result
  	}

  })

  /**
   *
   * A Track of quaternion keyframe values.
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function QuaternionKeyframeTrack (name, times, values, interpolation) {
  	KeyframeTrack.call(this, name, times, values, interpolation)
  }

  QuaternionKeyframeTrack.prototype = Object.assign(Object.create(KeyframeTrack.prototype), {

  	constructor: QuaternionKeyframeTrack,

  	ValueTypeName: 'quaternion',

  	// ValueBufferType is inherited

  	DefaultInterpolation: InterpolateLinear,

  	InterpolantFactoryMethodLinear: function (result) {
  		return new QuaternionLinearInterpolant(this.times, this.values, this.getValueSize(), result)
  	},

  	InterpolantFactoryMethodSmooth: undefined // not yet implemented

  })

  /**
   *
   * A Track of keyframe values that represent color.
   *
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function ColorKeyframeTrack (name, times, values, interpolation) {
  	KeyframeTrack.call(this, name, times, values, interpolation)
  }

  ColorKeyframeTrack.prototype = Object.assign(Object.create(KeyframeTrack.prototype), {

  	constructor: ColorKeyframeTrack,

  	ValueTypeName: 'color'

  	// ValueBufferType is inherited

  	// DefaultInterpolation is inherited

  	// Note: Very basic implementation and nothing special yet.
  	// However, this is the place for color space parameterization.

  })

  /**
   *
   * A Track of numeric keyframe values.
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function NumberKeyframeTrack (name, times, values, interpolation) {
  	KeyframeTrack.call(this, name, times, values, interpolation)
  }

  NumberKeyframeTrack.prototype = Object.assign(Object.create(KeyframeTrack.prototype), {

  	constructor: NumberKeyframeTrack,

  	ValueTypeName: 'number'

  	// ValueBufferType is inherited

  	// DefaultInterpolation is inherited

  })

  /**
   * Fast and simple cubic spline interpolant.
   *
   * It was derived from a Hermitian construction setting the first derivative
   * at each sample position to the linear slope between neighboring positions
   * over their parameter interval.
   *
   * @author tschw
   */

  function CubicInterpolant (parameterPositions, sampleValues, sampleSize, resultBuffer) {
  	Interpolant.call(this, parameterPositions, sampleValues, sampleSize, resultBuffer)

  	this._weightPrev = -0
  	this._offsetPrev = -0
  	this._weightNext = -0
  	this._offsetNext = -0
  }

  CubicInterpolant.prototype = Object.assign(Object.create(Interpolant.prototype), {

  	constructor: CubicInterpolant,

  	DefaultSettings_: {

  		endingStart: ZeroCurvatureEnding,
  		endingEnd: ZeroCurvatureEnding

  	},

  	intervalChanged_: function (i1, t0, t1) {
  		var pp = this.parameterPositions
  			var iPrev = i1 - 2
  			var iNext = i1 + 1

  			var tPrev = pp[iPrev]
  			var tNext = pp[iNext]

  		if (tPrev === undefined) {
  			switch (this.getSettings_().endingStart) {
  				case ZeroSlopeEnding:

  					// f'(t0) = 0
  					iPrev = i1
  					tPrev = 2 * t0 - t1

  					break

  				case WrapAroundEnding:

  					// use the other end of the curve
  					iPrev = pp.length - 2
  					tPrev = t0 + pp[iPrev] - pp[iPrev + 1]

  					break

  				default: // ZeroCurvatureEnding

  					// f''(t0) = 0 a.k.a. Natural Spline
  					iPrev = i1
  					tPrev = t1
  			}
  		}

  		if (tNext === undefined) {
  			switch (this.getSettings_().endingEnd) {
  				case ZeroSlopeEnding:

  					// f'(tN) = 0
  					iNext = i1
  					tNext = 2 * t1 - t0

  					break

  				case WrapAroundEnding:

  					// use the other end of the curve
  					iNext = 1
  					tNext = t1 + pp[1] - pp[0]

  					break

  				default: // ZeroCurvatureEnding

  					// f''(tN) = 0, a.k.a. Natural Spline
  					iNext = i1 - 1
  					tNext = t0
  			}
  		}

  		var halfDt = (t1 - t0) * 0.5
  			var stride = this.valueSize

  		this._weightPrev = halfDt / (t0 - tPrev)
  		this._weightNext = halfDt / (tNext - t1)
  		this._offsetPrev = iPrev * stride
  		this._offsetNext = iNext * stride
  	},

  	interpolate_: function (i1, t0, t, t1) {
  		var result = this.resultBuffer
  			var values = this.sampleValues
  			var stride = this.valueSize

  			var o1 = i1 * stride; var		o0 = o1 - stride
  			var oP = this._offsetPrev; var 	oN = this._offsetNext
  			var wP = this._weightPrev; var	wN = this._weightNext

  			var p = (t - t0) / (t1 - t0)
  			var pp = p * p
  			var ppp = pp * p

  		// evaluate polynomials

  		var sP = -wP * ppp + 2 * wP * pp - wP * p
  		var s0 = (1 + wP) * ppp + (-1.5 - 2 * wP) * pp + (-0.5 + wP) * p + 1
  		var s1 = (-1 - wN) * ppp + (1.5 + wN) * pp + 0.5 * p
  		var sN = wN * ppp - wN * pp

  		// combine data linearly

  		for (var i = 0; i !== stride; ++i) {
  			result[i] =
  					sP * values[oP + i] +
  					s0 * values[o0 + i] +
  					s1 * values[o1 + i] +
  					sN * values[oN + i]
  		}

  		return result
  	}

  })

  /**
   * @author tschw
   */

  function LinearInterpolant (parameterPositions, sampleValues, sampleSize, resultBuffer) {
  	Interpolant.call(this, parameterPositions, sampleValues, sampleSize, resultBuffer)
  }

  LinearInterpolant.prototype = Object.assign(Object.create(Interpolant.prototype), {

  	constructor: LinearInterpolant,

  	interpolate_: function (i1, t0, t, t1) {
  		var result = this.resultBuffer
  			var values = this.sampleValues
  			var stride = this.valueSize

  			var offset1 = i1 * stride
  			var offset0 = offset1 - stride

  			var weight1 = (t - t0) / (t1 - t0)
  			var weight0 = 1 - weight1

  		for (var i = 0; i !== stride; ++i) {
  			result[i] =
  					values[offset0 + i] * weight0 +
  					values[offset1 + i] * weight1
  		}

  		return result
  	}

  })

  /**
   *
   * Interpolant that evaluates to the sample value at the position preceeding
   * the parameter.
   *
   * @author tschw
   */

  function DiscreteInterpolant (parameterPositions, sampleValues, sampleSize, resultBuffer) {
  	Interpolant.call(this, parameterPositions, sampleValues, sampleSize, resultBuffer)
  }

  DiscreteInterpolant.prototype = Object.assign(Object.create(Interpolant.prototype), {

  	constructor: DiscreteInterpolant,

  	interpolate_: function (i1 /*, t0, t, t1 */) {
  		return this.copySampleValue_(i1 - 1)
  	}

  })

  /**
   * @author tschw
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   */

  var AnimationUtils = {

  	// same as Array.prototype.slice, but also works on typed arrays
  	arraySlice: function (array, from, to) {
  		if (AnimationUtils.isTypedArray(array)) {
  			// in ios9 array.subarray(from, undefined) will return empty array
  			// but array.subarray(from) or array.subarray(from, len) is correct
  			return new array.constructor(array.subarray(from, to !== undefined ? to : array.length))
  		}

  		return array.slice(from, to)
  	},

  	// converts an array to a specific type
  	convertArray: function (array, type, forceClone) {
  		if (!array || // let 'undefined' and 'null' pass
  				!forceClone && array.constructor === type) return array

  		if (typeof type.BYTES_PER_ELEMENT === 'number') {
  			return new type(array) // create typed array
  		}

  		return Array.prototype.slice.call(array) // create Array
  	},

  	isTypedArray: function (object) {
  		return ArrayBuffer.isView(object) &&
  				!(object instanceof DataView)
  	},

  	// returns an array by which times and values can be sorted
  	getKeyframeOrder: function (times) {
  		function compareTime (i, j) {
  			return times[i] - times[j]
  		}

  		var n = times.length
  		var result = new Array(n)
  		for (var i = 0; i !== n; ++i) result[i] = i

  		result.sort(compareTime)

  		return result
  	},

  	// uses the array previously returned by 'getKeyframeOrder' to sort data
  	sortedArray: function (values, stride, order) {
  		var nValues = values.length
  		var result = new values.constructor(nValues)

  		for (var i = 0, dstOffset = 0; dstOffset !== nValues; ++i) {
  			var srcOffset = order[i] * stride

  			for (var j = 0; j !== stride; ++j) {
  				result[dstOffset++] = values[srcOffset + j]
  			}
  		}

  		return result
  	},

  	// function for parsing AOS keyframe formats
  	flattenJSON: function (jsonKeys, times, values, valuePropertyName) {
  		var i = 1; var key = jsonKeys[0]

  		while (key !== undefined && key[valuePropertyName] === undefined) {
  			key = jsonKeys[i++]
  		}

  		if (key === undefined) return // no data

  		var value = key[valuePropertyName]
  		if (value === undefined) return // no data

  		if (Array.isArray(value)) {
  			do {
  				value = key[valuePropertyName]

  				if (value !== undefined) {
  					times.push(key.time)
  					values.push.apply(values, value) // push all elements
  				}

  				key = jsonKeys[i++]
  			} while (key !== undefined)
  		} else if (value.toArray !== undefined) {
  			// ...assume THREE.Math-ish

  			do {
  				value = key[valuePropertyName]

  				if (value !== undefined) {
  					times.push(key.time)
  					value.toArray(values, values.length)
  				}

  				key = jsonKeys[i++]
  			} while (key !== undefined)
  		} else {
  			// otherwise push as-is

  			do {
  				value = key[valuePropertyName]

  				if (value !== undefined) {
  					times.push(key.time)
  					values.push(value)
  				}

  				key = jsonKeys[i++]
  			} while (key !== undefined)
  		}
  	}

  }

  /**
   *
   * A timed sequence of keyframes for a specific property.
   *
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function KeyframeTrack (name, times, values, interpolation) {
  	if (name === undefined) throw new Error('THREE.KeyframeTrack: track name is undefined')
  	if (times === undefined || times.length === 0) throw new Error('THREE.KeyframeTrack: no keyframes in track named ' + name)

  	this.name = name

  	this.times = AnimationUtils.convertArray(times, this.TimeBufferType)
  	this.values = AnimationUtils.convertArray(values, this.ValueBufferType)

  	this.setInterpolation(interpolation || this.DefaultInterpolation)

  	this.validate()
  	this.optimize()
  }

  // Static methods:

  Object.assign(KeyframeTrack, {

  	// Serialization (in static context, because of constructor invocation
  	// and automatic invocation of .toJSON):

  	parse: function (json) {
  		if (json.type === undefined) {
  			throw new Error('THREE.KeyframeTrack: track type undefined, can not parse')
  		}

  		var trackType = KeyframeTrack._getTrackTypeForValueTypeName(json.type)

  		if (json.times === undefined) {
  			var times = []; var values = []

  			AnimationUtils.flattenJSON(json.keys, times, values, 'value')

  			json.times = times
  			json.values = values
  		}

  		// derived classes can define a static parse method
  		if (trackType.parse !== undefined) {
  			return trackType.parse(json)
  		} else {
  			// by default, we assume a constructor compatible with the base
  			return new trackType(json.name, json.times, json.values, json.interpolation)
  		}
  	},

  	toJSON: function (track) {
  		var trackType = track.constructor

  		var json

  		// derived classes can define a static toJSON method
  		if (trackType.toJSON !== undefined) {
  			json = trackType.toJSON(track)
  		} else {
  			// by default, we assume the data can be serialized as-is
  			json = {

  				name: track.name,
  				times: AnimationUtils.convertArray(track.times, Array),
  				values: AnimationUtils.convertArray(track.values, Array)

  			}

  			var interpolation = track.getInterpolation()

  			if (interpolation !== track.DefaultInterpolation) {
  				json.interpolation = interpolation
  			}
  		}

  		json.type = track.ValueTypeName // mandatory

  		return json
  	},

  	_getTrackTypeForValueTypeName: function (typeName) {
  		switch (typeName.toLowerCase()) {
  			case 'scalar':
  			case 'double':
  			case 'float':
  			case 'number':
  			case 'integer':

  				return NumberKeyframeTrack

  			case 'vector':
  			case 'vector2':
  			case 'vector3':
  			case 'vector4':

  				return VectorKeyframeTrack

  			case 'color':

  				return ColorKeyframeTrack

  			case 'quaternion':

  				return QuaternionKeyframeTrack

  			case 'bool':
  			case 'boolean':

  				return BooleanKeyframeTrack

  			case 'string':

  				return StringKeyframeTrack
  		}

  		throw new Error('THREE.KeyframeTrack: Unsupported typeName: ' + typeName)
  	}

  })

  Object.assign(KeyframeTrack.prototype, {

  	constructor: KeyframeTrack,

  	TimeBufferType: Float32Array,

  	ValueBufferType: Float32Array,

  	DefaultInterpolation: InterpolateLinear,

  	InterpolantFactoryMethodDiscrete: function (result) {
  		return new DiscreteInterpolant(this.times, this.values, this.getValueSize(), result)
  	},

  	InterpolantFactoryMethodLinear: function (result) {
  		return new LinearInterpolant(this.times, this.values, this.getValueSize(), result)
  	},

  	InterpolantFactoryMethodSmooth: function (result) {
  		return new CubicInterpolant(this.times, this.values, this.getValueSize(), result)
  	},

  	setInterpolation: function (interpolation) {
  		var factoryMethod

  		switch (interpolation) {
  			case InterpolateDiscrete:

  				factoryMethod = this.InterpolantFactoryMethodDiscrete

  				break

  			case InterpolateLinear:

  				factoryMethod = this.InterpolantFactoryMethodLinear

  				break

  			case InterpolateSmooth:

  				factoryMethod = this.InterpolantFactoryMethodSmooth

  				break
  		}

  		if (factoryMethod === undefined) {
  			var message = 'unsupported interpolation for ' +
  				this.ValueTypeName + ' keyframe track named ' + this.name

  			if (this.createInterpolant === undefined) {
  				// fall back to default, unless the default itself is messed up
  				if (interpolation !== this.DefaultInterpolation) {
  					this.setInterpolation(this.DefaultInterpolation)
  				} else {
  					throw new Error(message) // fatal, in this case
  				}
  			}

  			console.warn('THREE.KeyframeTrack:', message)
  			return
  		}

  		this.createInterpolant = factoryMethod
  	},

  	getInterpolation: function () {
  		switch (this.createInterpolant) {
  			case this.InterpolantFactoryMethodDiscrete:

  				return InterpolateDiscrete

  			case this.InterpolantFactoryMethodLinear:

  				return InterpolateLinear

  			case this.InterpolantFactoryMethodSmooth:

  				return InterpolateSmooth
  		}
  	},

  	getValueSize: function () {
  		return this.values.length / this.times.length
  	},

  	// move all keyframes either forwards or backwards in time
  	shift: function (timeOffset) {
  		if (timeOffset !== 0.0) {
  			var times = this.times

  			for (var i = 0, n = times.length; i !== n; ++i) {
  				times[i] += timeOffset
  			}
  		}

  		return this
  	},

  	// scale all keyframe times by a factor (useful for frame <-> seconds conversions)
  	scale: function (timeScale) {
  		if (timeScale !== 1.0) {
  			var times = this.times

  			for (var i = 0, n = times.length; i !== n; ++i) {
  				times[i] *= timeScale
  			}
  		}

  		return this
  	},

  	// removes keyframes before and after animation without changing any values within the range [startTime, endTime].
  	// IMPORTANT: We do not shift around keys to the start of the track time, because for interpolated keys this will change their values
  	trim: function (startTime, endTime) {
  		var times = this.times
  			var nKeys = times.length
  			var from = 0
  			var to = nKeys - 1

  		while (from !== nKeys && times[from] < startTime) {
  			++from
  		}

  		while (to !== -1 && times[to] > endTime) {
  			--to
  		}

  		++to // inclusive -> exclusive bound

  		if (from !== 0 || to !== nKeys) {
  			// empty tracks are forbidden, so keep at least one keyframe
  			if (from >= to) to = Math.max(to, 1), from = to - 1

  			var stride = this.getValueSize()
  			this.times = AnimationUtils.arraySlice(times, from, to)
  			this.values = AnimationUtils.arraySlice(this.values, from * stride, to * stride)
  		}

  		return this
  	},

  	// ensure we do not get a GarbageInGarbageOut situation, make sure tracks are at least minimally viable
  	validate: function () {
  		var valid = true

  		var valueSize = this.getValueSize()
  		if (valueSize - Math.floor(valueSize) !== 0) {
  			console.error('THREE.KeyframeTrack: Invalid value size in track.', this)
  			valid = false
  		}

  		var times = this.times
  			var values = this.values

  			var nKeys = times.length

  		if (nKeys === 0) {
  			console.error('THREE.KeyframeTrack: Track is empty.', this)
  			valid = false
  		}

  		var prevTime = null

  		for (var i = 0; i !== nKeys; i++) {
  			var currTime = times[i]

  			if (typeof currTime === 'number' && isNaN(currTime)) {
  				console.error('THREE.KeyframeTrack: Time is not a valid number.', this, i, currTime)
  				valid = false
  				break
  			}

  			if (prevTime !== null && prevTime > currTime) {
  				console.error('THREE.KeyframeTrack: Out of order keys.', this, i, currTime, prevTime)
  				valid = false
  				break
  			}

  			prevTime = currTime
  		}

  		if (values !== undefined) {
  			if (AnimationUtils.isTypedArray(values)) {
  				for (var i = 0, n = values.length; i !== n; ++i) {
  					var value = values[i]

  					if (isNaN(value)) {
  						console.error('THREE.KeyframeTrack: Value is not a valid number.', this, i, value)
  						valid = false
  						break
  					}
  				}
  			}
  		}

  		return valid
  	},

  	// removes equivalent sequential keys as common in morph target sequences
  	// (0,0,0,0,1,1,1,0,0,0,0,0,0,0) --> (0,0,1,1,0,0)
  	optimize: function () {
  		var times = this.times
  			var values = this.values
  			var stride = this.getValueSize()

  			var smoothInterpolation = this.getInterpolation() === InterpolateSmooth

  			var writeIndex = 1
  			var lastIndex = times.length - 1

  		for (var i = 1; i < lastIndex; ++i) {
  			var keep = false

  			var time = times[i]
  			var timeNext = times[i + 1]

  			// remove adjacent keyframes scheduled at the same time

  			if (time !== timeNext && (i !== 1 || time !== time[0])) {
  				if (!smoothInterpolation) {
  					// remove unnecessary keyframes same as their neighbors

  					var offset = i * stride
  						var offsetP = offset - stride
  						var offsetN = offset + stride

  					for (var j = 0; j !== stride; ++j) {
  						var value = values[offset + j]

  						if (value !== values[offsetP + j] ||
  							value !== values[offsetN + j]) {
  							keep = true
  							break
  						}
  					}
  				} else {
  					keep = true
  				}
  			}

  			// in-place compaction

  			if (keep) {
  				if (i !== writeIndex) {
  					times[writeIndex] = times[i]

  					var readOffset = i * stride
  						var writeOffset = writeIndex * stride

  					for (var j = 0; j !== stride; ++j) {
  						values[writeOffset + j] = values[readOffset + j]
  					}
  				}

  				++writeIndex
  			}
  		}

  		// flush last keyframe (compaction looks ahead)

  		if (lastIndex > 0) {
  			times[writeIndex] = times[lastIndex]

  			for (var readOffset = lastIndex * stride, writeOffset = writeIndex * stride, j = 0; j !== stride; ++j) {
  				values[writeOffset + j] = values[readOffset + j]
  			}

  			++writeIndex
  		}

  		if (writeIndex !== times.length) {
  			this.times = AnimationUtils.arraySlice(times, 0, writeIndex)
  			this.values = AnimationUtils.arraySlice(values, 0, writeIndex * stride)
  		}

  		return this
  	}

  })

  /**
   *
   * A Track of vectored keyframe values.
   *
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function VectorKeyframeTrack (name, times, values, interpolation) {
  	KeyframeTrack.call(this, name, times, values, interpolation)
  }

  VectorKeyframeTrack.prototype = Object.assign(Object.create(KeyframeTrack.prototype), {

  	constructor: VectorKeyframeTrack,

  	ValueTypeName: 'vector'

  	// ValueBufferType is inherited

  	// DefaultInterpolation is inherited

  })

  /**
   *
   * Reusable set of Tracks that represent an animation.
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   */

  function AnimationClip (name, duration, tracks) {
  	this.name = name
  	this.tracks = tracks
  	this.duration = (duration !== undefined) ? duration : -1

  	this.uuid = _Math.generateUUID()

  	// this means it should figure out its duration by scanning the tracks
  	if (this.duration < 0) {
  		this.resetDuration()
  	}

  	this.optimize()
  }

  Object.assign(AnimationClip, {

  	parse: function (json) {
  		var tracks = []
  			var jsonTracks = json.tracks
  			var frameTime = 1.0 / (json.fps || 1.0)

  		for (var i = 0, n = jsonTracks.length; i !== n; ++i) {
  			tracks.push(KeyframeTrack.parse(jsonTracks[i]).scale(frameTime))
  		}

  		return new AnimationClip(json.name, json.duration, tracks)
  	},

  	toJSON: function (clip) {
  		var tracks = []
  			var clipTracks = clip.tracks

  		var json = {

  			name: clip.name,
  			duration: clip.duration,
  			tracks: tracks,
  			uuid: clip.uuid

  		}

  		for (var i = 0, n = clipTracks.length; i !== n; ++i) {
  			tracks.push(KeyframeTrack.toJSON(clipTracks[i]))
  		}

  		return json
  	},

  	CreateFromMorphTargetSequence: function (name, morphTargetSequence, fps, noLoop) {
  		var numMorphTargets = morphTargetSequence.length
  		var tracks = []

  		for (var i = 0; i < numMorphTargets; i++) {
  			var times = []
  			var values = []

  			times.push(
  				(i + numMorphTargets - 1) % numMorphTargets,
  				i,
  				(i + 1) % numMorphTargets)

  			values.push(0, 1, 0)

  			var order = AnimationUtils.getKeyframeOrder(times)
  			times = AnimationUtils.sortedArray(times, 1, order)
  			values = AnimationUtils.sortedArray(values, 1, order)

  			// if there is a key at the first frame, duplicate it as the
  			// last frame as well for perfect loop.
  			if (!noLoop && times[0] === 0) {
  				times.push(numMorphTargets)
  				values.push(values[0])
  			}

  			tracks.push(
  				new NumberKeyframeTrack(
  					'.morphTargetInfluences[' + morphTargetSequence[i].name + ']',
  					times, values
  				).scale(1.0 / fps))
  		}

  		return new AnimationClip(name, -1, tracks)
  	},

  	findByName: function (objectOrClipArray, name) {
  		var clipArray = objectOrClipArray

  		if (!Array.isArray(objectOrClipArray)) {
  			var o = objectOrClipArray
  			clipArray = o.geometry && o.geometry.animations || o.animations
  		}

  		for (var i = 0; i < clipArray.length; i++) {
  			if (clipArray[i].name === name) {
  				return clipArray[i]
  			}
  		}

  		return null
  	},

  	CreateClipsFromMorphTargetSequences: function (morphTargets, fps, noLoop) {
  		var animationToMorphTargets = {}

  		// tested with https://regex101.com/ on trick sequences
  		// such flamingo_flyA_003, flamingo_run1_003, crdeath0059
  		var pattern = /^([\w-]*?)([\d]+)$/

  		// sort morph target names into animation groups based
  		// patterns like Walk_001, Walk_002, Run_001, Run_002
  		for (var i = 0, il = morphTargets.length; i < il; i++) {
  			var morphTarget = morphTargets[i]
  			var parts = morphTarget.name.match(pattern)

  			if (parts && parts.length > 1) {
  				var name = parts[1]

  				var animationMorphTargets = animationToMorphTargets[name]
  				if (!animationMorphTargets) {
  					animationToMorphTargets[name] = animationMorphTargets = []
  				}

  				animationMorphTargets.push(morphTarget)
  			}
  		}

  		var clips = []

  		for (var name in animationToMorphTargets) {
  			clips.push(AnimationClip.CreateFromMorphTargetSequence(name, animationToMorphTargets[name], fps, noLoop))
  		}

  		return clips
  	},

  	// parse the animation.hierarchy format
  	parseAnimation: function (animation, bones) {
  		if (!animation) {
  			console.error('THREE.AnimationClip: No animation in JSONLoader data.')
  			return null
  		}

  		var addNonemptyTrack = function (trackType, trackName, animationKeys, propertyName, destTracks) {
  			// only return track if there are actually keys.
  			if (animationKeys.length !== 0) {
  				var times = []
  				var values = []

  				AnimationUtils.flattenJSON(animationKeys, times, values, propertyName)

  				// empty keys are filtered out, so check again
  				if (times.length !== 0) {
  					destTracks.push(new trackType(trackName, times, values))
  				}
  			}
  		}

  		var tracks = []

  		var clipName = animation.name || 'default'
  		// automatic length determination in AnimationClip.
  		var duration = animation.length || -1
  		var fps = animation.fps || 30

  		var hierarchyTracks = animation.hierarchy || []

  		for (var h = 0; h < hierarchyTracks.length; h++) {
  			var animationKeys = hierarchyTracks[h].keys

  			// skip empty tracks
  			if (!animationKeys || animationKeys.length === 0) continue

  			// process morph targets
  			if (animationKeys[0].morphTargets) {
  				// figure out all morph targets used in this track
  				var morphTargetNames = {}

  				for (var k = 0; k < animationKeys.length; k++) {
  					if (animationKeys[k].morphTargets) {
  						for (var m = 0; m < animationKeys[k].morphTargets.length; m++) {
  							morphTargetNames[animationKeys[k].morphTargets[m]] = -1
  						}
  					}
  				}

  				// create a track for each morph target with all zero
  				// morphTargetInfluences except for the keys in which
  				// the morphTarget is named.
  				for (var morphTargetName in morphTargetNames) {
  					var times = []
  					var values = []

  					for (var m = 0; m !== animationKeys[k].morphTargets.length; ++m) {
  						var animationKey = animationKeys[k]

  						times.push(animationKey.time)
  						values.push((animationKey.morphTarget === morphTargetName) ? 1 : 0)
  					}

  					tracks.push(new NumberKeyframeTrack('.morphTargetInfluence[' + morphTargetName + ']', times, values))
  				}

  				duration = morphTargetNames.length * (fps || 1.0)
  			} else {
  				// ...assume skeletal animation

  				var boneName = '.bones[' + bones[h].name + ']'

  				addNonemptyTrack(
  					VectorKeyframeTrack, boneName + '.position',
  					animationKeys, 'pos', tracks)

  				addNonemptyTrack(
  					QuaternionKeyframeTrack, boneName + '.quaternion',
  					animationKeys, 'rot', tracks)

  				addNonemptyTrack(
  					VectorKeyframeTrack, boneName + '.scale',
  					animationKeys, 'scl', tracks)
  			}
  		}

  		if (tracks.length === 0) {
  			return null
  		}

  		var clip = new AnimationClip(clipName, duration, tracks)

  		return clip
  	}

  })

  Object.assign(AnimationClip.prototype, {

  	resetDuration: function () {
  		var tracks = this.tracks; var duration = 0

  		for (var i = 0, n = tracks.length; i !== n; ++i) {
  			var track = this.tracks[i]

  			duration = Math.max(duration, track.times[track.times.length - 1])
  		}

  		this.duration = duration
  	},

  	trim: function () {
  		for (var i = 0; i < this.tracks.length; i++) {
  			this.tracks[i].trim(0, this.duration)
  		}

  		return this
  	},

  	optimize: function () {
  		for (var i = 0; i < this.tracks.length; i++) {
  			this.tracks[i].optimize()
  		}

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function MaterialLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  	this.textures = {}
  }

  Object.assign(MaterialLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		var scope = this

  		var loader = new FileLoader(scope.manager)
  		loader.load(url, function (text) {
  			onLoad(scope.parse(JSON.parse(text)))
  		}, onProgress, onError)
  	},

  	setTextures: function (value) {
  		this.textures = value
  	},

  	parse: function (json) {
  		var textures = this.textures

  		function getTexture (name) {
  			if (textures[name] === undefined) {
  				console.warn('THREE.MaterialLoader: Undefined texture', name)
  			}

  			return textures[name]
  		}

  		var material = new Materials[json.type]()

  		if (json.uuid !== undefined) material.uuid = json.uuid
  		if (json.name !== undefined) material.name = json.name
  		if (json.color !== undefined) material.color.setHex(json.color)
  		if (json.roughness !== undefined) material.roughness = json.roughness
  		if (json.metalness !== undefined) material.metalness = json.metalness
  		if (json.emissive !== undefined) material.emissive.setHex(json.emissive)
  		if (json.specular !== undefined) material.specular.setHex(json.specular)
  		if (json.shininess !== undefined) material.shininess = json.shininess
  		if (json.clearCoat !== undefined) material.clearCoat = json.clearCoat
  		if (json.clearCoatRoughness !== undefined) material.clearCoatRoughness = json.clearCoatRoughness
  		if (json.uniforms !== undefined) material.uniforms = json.uniforms
  		if (json.vertexShader !== undefined) material.vertexShader = json.vertexShader
  		if (json.fragmentShader !== undefined) material.fragmentShader = json.fragmentShader
  		if (json.vertexColors !== undefined) material.vertexColors = json.vertexColors
  		if (json.fog !== undefined) material.fog = json.fog
  		if (json.flatShading !== undefined) material.flatShading = json.flatShading
  		if (json.blending !== undefined) material.blending = json.blending
  		if (json.side !== undefined) material.side = json.side
  		if (json.opacity !== undefined) material.opacity = json.opacity
  		if (json.transparent !== undefined) material.transparent = json.transparent
  		if (json.alphaTest !== undefined) material.alphaTest = json.alphaTest
  		if (json.depthTest !== undefined) material.depthTest = json.depthTest
  		if (json.depthWrite !== undefined) material.depthWrite = json.depthWrite
  		if (json.colorWrite !== undefined) material.colorWrite = json.colorWrite
  		if (json.wireframe !== undefined) material.wireframe = json.wireframe
  		if (json.wireframeLinewidth !== undefined) material.wireframeLinewidth = json.wireframeLinewidth
  		if (json.wireframeLinecap !== undefined) material.wireframeLinecap = json.wireframeLinecap
  		if (json.wireframeLinejoin !== undefined) material.wireframeLinejoin = json.wireframeLinejoin

  		if (json.rotation !== undefined) material.rotation = json.rotation

  		if (json.linewidth !== 1) material.linewidth = json.linewidth
  		if (json.dashSize !== undefined) material.dashSize = json.dashSize
  		if (json.gapSize !== undefined) material.gapSize = json.gapSize
  		if (json.scale !== undefined) material.scale = json.scale

  		if (json.polygonOffset !== undefined) material.polygonOffset = json.polygonOffset
  		if (json.polygonOffsetFactor !== undefined) material.polygonOffsetFactor = json.polygonOffsetFactor
  		if (json.polygonOffsetUnits !== undefined) material.polygonOffsetUnits = json.polygonOffsetUnits

  		if (json.skinning !== undefined) material.skinning = json.skinning
  		if (json.morphTargets !== undefined) material.morphTargets = json.morphTargets
  		if (json.dithering !== undefined) material.dithering = json.dithering

  		if (json.visible !== undefined) material.visible = json.visible
  		if (json.userData !== undefined) material.userData = json.userData

  		// Deprecated

  		if (json.shading !== undefined) material.flatShading = json.shading === 1 // THREE.FlatShading

  		// for PointsMaterial

  		if (json.size !== undefined) material.size = json.size
  		if (json.sizeAttenuation !== undefined) material.sizeAttenuation = json.sizeAttenuation

  		// maps

  		if (json.map !== undefined) material.map = getTexture(json.map)

  		if (json.alphaMap !== undefined) {
  			material.alphaMap = getTexture(json.alphaMap)
  			material.transparent = true
  		}

  		if (json.bumpMap !== undefined) material.bumpMap = getTexture(json.bumpMap)
  		if (json.bumpScale !== undefined) material.bumpScale = json.bumpScale

  		if (json.normalMap !== undefined) material.normalMap = getTexture(json.normalMap)
  		if (json.normalScale !== undefined) {
  			var normalScale = json.normalScale

  			if (Array.isArray(normalScale) === false) {
  				// Blender exporter used to export a scalar. See #7459

  				normalScale = [normalScale, normalScale]
  			}

  			material.normalScale = new Vector2().fromArray(normalScale)
  		}

  		if (json.displacementMap !== undefined) material.displacementMap = getTexture(json.displacementMap)
  		if (json.displacementScale !== undefined) material.displacementScale = json.displacementScale
  		if (json.displacementBias !== undefined) material.displacementBias = json.displacementBias

  		if (json.roughnessMap !== undefined) material.roughnessMap = getTexture(json.roughnessMap)
  		if (json.metalnessMap !== undefined) material.metalnessMap = getTexture(json.metalnessMap)

  		if (json.emissiveMap !== undefined) material.emissiveMap = getTexture(json.emissiveMap)
  		if (json.emissiveIntensity !== undefined) material.emissiveIntensity = json.emissiveIntensity

  		if (json.specularMap !== undefined) material.specularMap = getTexture(json.specularMap)

  		if (json.envMap !== undefined) material.envMap = getTexture(json.envMap)

  		if (json.reflectivity !== undefined) material.reflectivity = json.reflectivity

  		if (json.lightMap !== undefined) material.lightMap = getTexture(json.lightMap)
  		if (json.lightMapIntensity !== undefined) material.lightMapIntensity = json.lightMapIntensity

  		if (json.aoMap !== undefined) material.aoMap = getTexture(json.aoMap)
  		if (json.aoMapIntensity !== undefined) material.aoMapIntensity = json.aoMapIntensity

  		if (json.gradientMap !== undefined) material.gradientMap = getTexture(json.gradientMap)

  		return material
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function BufferGeometryLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  }

  Object.assign(BufferGeometryLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		var scope = this

  		var loader = new FileLoader(scope.manager)
  		loader.load(url, function (text) {
  			onLoad(scope.parse(JSON.parse(text)))
  		}, onProgress, onError)
  	},

  	parse: function (json) {
  		var geometry = new BufferGeometry()

  		var index = json.data.index

  		if (index !== undefined) {
  			var typedArray = new TYPED_ARRAYS[index.type](index.array)
  			geometry.setIndex(new BufferAttribute(typedArray, 1))
  		}

  		var attributes = json.data.attributes

  		for (var key in attributes) {
  			var attribute = attributes[key]
  			var typedArray = new TYPED_ARRAYS[attribute.type](attribute.array)

  			geometry.addAttribute(key, new BufferAttribute(typedArray, attribute.itemSize, attribute.normalized))
  		}

  		var groups = json.data.groups || json.data.drawcalls || json.data.offsets

  		if (groups !== undefined) {
  			for (var i = 0, n = groups.length; i !== n; ++i) {
  				var group = groups[i]

  				geometry.addGroup(group.start, group.count, group.materialIndex)
  			}
  		}

  		var boundingSphere = json.data.boundingSphere

  		if (boundingSphere !== undefined) {
  			var center = new Vector3()

  			if (boundingSphere.center !== undefined) {
  				center.fromArray(boundingSphere.center)
  			}

  			geometry.boundingSphere = new Sphere(center, boundingSphere.radius)
  		}

  		return geometry
  	}

  })

  var TYPED_ARRAYS = {
  	Int8Array: Int8Array,
  	Uint8Array: Uint8Array,
  	// Workaround for IE11 pre KB2929437. See #11440
  	Uint8ClampedArray: typeof Uint8ClampedArray !== 'undefined' ? Uint8ClampedArray : Uint8Array,
  	Int16Array: Int16Array,
  	Uint16Array: Uint16Array,
  	Int32Array: Int32Array,
  	Uint32Array: Uint32Array,
  	Float32Array: Float32Array,
  	Float64Array: Float64Array
  }

  /**
   * @author alteredq / http://alteredqualia.com/
   */

  function Loader () {}

  Loader.Handlers = {

  	handlers: [],

  	add: function (regex, loader) {
  		this.handlers.push(regex, loader)
  	},

  	get: function (file) {
  		var handlers = this.handlers

  		for (var i = 0, l = handlers.length; i < l; i += 2) {
  			var regex = handlers[i]
  			var loader = handlers[i + 1]

  			if (regex.test(file)) {
  				return loader
  			}
  		}

  		return null
  	}

  }

  Object.assign(Loader.prototype, {

  	crossOrigin: undefined,

  	onLoadStart: function () {},

  	onLoadProgress: function () {},

  	onLoadComplete: function () {},

  	initMaterials: function (materials, texturePath, crossOrigin) {
  		var array = []

  		for (var i = 0; i < materials.length; ++i) {
  			array[i] = this.createMaterial(materials[i], texturePath, crossOrigin)
  		}

  		return array
  	},

  	createMaterial: (function () {
  		var BlendingMode = {
  			NoBlending: NoBlending,
  			NormalBlending: NormalBlending,
  			AdditiveBlending: AdditiveBlending,
  			SubtractiveBlending: SubtractiveBlending,
  			MultiplyBlending: MultiplyBlending,
  			CustomBlending: CustomBlending
  		}

  		var color = new Color()
  		var textureLoader = new TextureLoader()
  		var materialLoader = new MaterialLoader()

  		return function createMaterial (m, texturePath, crossOrigin) {
  			// convert from old material format

  			var textures = {}

  			function loadTexture (path, repeat, offset, wrap, anisotropy) {
  				var fullPath = texturePath + path
  				var loader = Loader.Handlers.get(fullPath)

  				var texture

  				if (loader !== null) {
  					texture = loader.load(fullPath)
  				} else {
  					textureLoader.setCrossOrigin(crossOrigin)
  					texture = textureLoader.load(fullPath)
  				}

  				if (repeat !== undefined) {
  					texture.repeat.fromArray(repeat)

  					if (repeat[0] !== 1) texture.wrapS = RepeatWrapping
  					if (repeat[1] !== 1) texture.wrapT = RepeatWrapping
  				}

  				if (offset !== undefined) {
  					texture.offset.fromArray(offset)
  				}

  				if (wrap !== undefined) {
  					if (wrap[0] === 'repeat') texture.wrapS = RepeatWrapping
  					if (wrap[0] === 'mirror') texture.wrapS = MirroredRepeatWrapping

  					if (wrap[1] === 'repeat') texture.wrapT = RepeatWrapping
  					if (wrap[1] === 'mirror') texture.wrapT = MirroredRepeatWrapping
  				}

  				if (anisotropy !== undefined) {
  					texture.anisotropy = anisotropy
  				}

  				var uuid = _Math.generateUUID()

  				textures[uuid] = texture

  				return uuid
  			}

  			//

  			var json = {
  				uuid: _Math.generateUUID(),
  				type: 'MeshLambertMaterial'
  			}

  			for (var name in m) {
  				var value = m[name]

  				switch (name) {
  					case 'DbgColor':
  					case 'DbgIndex':
  					case 'opticalDensity':
  					case 'illumination':
  						break
  					case 'DbgName':
  						json.name = value
  						break
  					case 'blending':
  						json.blending = BlendingMode[value]
  						break
  					case 'colorAmbient':
  					case 'mapAmbient':
  						console.warn('THREE.Loader.createMaterial:', name, 'is no longer supported.')
  						break
  					case 'colorDiffuse':
  						json.color = color.fromArray(value).getHex()
  						break
  					case 'colorSpecular':
  						json.specular = color.fromArray(value).getHex()
  						break
  					case 'colorEmissive':
  						json.emissive = color.fromArray(value).getHex()
  						break
  					case 'specularCoef':
  						json.shininess = value
  						break
  					case 'shading':
  						if (value.toLowerCase() === 'basic') json.type = 'MeshBasicMaterial'
  						if (value.toLowerCase() === 'phong') json.type = 'MeshPhongMaterial'
  						if (value.toLowerCase() === 'standard') json.type = 'MeshStandardMaterial'
  						break
  					case 'mapDiffuse':
  						json.map = loadTexture(value, m.mapDiffuseRepeat, m.mapDiffuseOffset, m.mapDiffuseWrap, m.mapDiffuseAnisotropy)
  						break
  					case 'mapDiffuseRepeat':
  					case 'mapDiffuseOffset':
  					case 'mapDiffuseWrap':
  					case 'mapDiffuseAnisotropy':
  						break
  					case 'mapEmissive':
  						json.emissiveMap = loadTexture(value, m.mapEmissiveRepeat, m.mapEmissiveOffset, m.mapEmissiveWrap, m.mapEmissiveAnisotropy)
  						break
  					case 'mapEmissiveRepeat':
  					case 'mapEmissiveOffset':
  					case 'mapEmissiveWrap':
  					case 'mapEmissiveAnisotropy':
  						break
  					case 'mapLight':
  						json.lightMap = loadTexture(value, m.mapLightRepeat, m.mapLightOffset, m.mapLightWrap, m.mapLightAnisotropy)
  						break
  					case 'mapLightRepeat':
  					case 'mapLightOffset':
  					case 'mapLightWrap':
  					case 'mapLightAnisotropy':
  						break
  					case 'mapAO':
  						json.aoMap = loadTexture(value, m.mapAORepeat, m.mapAOOffset, m.mapAOWrap, m.mapAOAnisotropy)
  						break
  					case 'mapAORepeat':
  					case 'mapAOOffset':
  					case 'mapAOWrap':
  					case 'mapAOAnisotropy':
  						break
  					case 'mapBump':
  						json.bumpMap = loadTexture(value, m.mapBumpRepeat, m.mapBumpOffset, m.mapBumpWrap, m.mapBumpAnisotropy)
  						break
  					case 'mapBumpScale':
  						json.bumpScale = value
  						break
  					case 'mapBumpRepeat':
  					case 'mapBumpOffset':
  					case 'mapBumpWrap':
  					case 'mapBumpAnisotropy':
  						break
  					case 'mapNormal':
  						json.normalMap = loadTexture(value, m.mapNormalRepeat, m.mapNormalOffset, m.mapNormalWrap, m.mapNormalAnisotropy)
  						break
  					case 'mapNormalFactor':
  						json.normalScale = value
  						break
  					case 'mapNormalRepeat':
  					case 'mapNormalOffset':
  					case 'mapNormalWrap':
  					case 'mapNormalAnisotropy':
  						break
  					case 'mapSpecular':
  						json.specularMap = loadTexture(value, m.mapSpecularRepeat, m.mapSpecularOffset, m.mapSpecularWrap, m.mapSpecularAnisotropy)
  						break
  					case 'mapSpecularRepeat':
  					case 'mapSpecularOffset':
  					case 'mapSpecularWrap':
  					case 'mapSpecularAnisotropy':
  						break
  					case 'mapMetalness':
  						json.metalnessMap = loadTexture(value, m.mapMetalnessRepeat, m.mapMetalnessOffset, m.mapMetalnessWrap, m.mapMetalnessAnisotropy)
  						break
  					case 'mapMetalnessRepeat':
  					case 'mapMetalnessOffset':
  					case 'mapMetalnessWrap':
  					case 'mapMetalnessAnisotropy':
  						break
  					case 'mapRoughness':
  						json.roughnessMap = loadTexture(value, m.mapRoughnessRepeat, m.mapRoughnessOffset, m.mapRoughnessWrap, m.mapRoughnessAnisotropy)
  						break
  					case 'mapRoughnessRepeat':
  					case 'mapRoughnessOffset':
  					case 'mapRoughnessWrap':
  					case 'mapRoughnessAnisotropy':
  						break
  					case 'mapAlpha':
  						json.alphaMap = loadTexture(value, m.mapAlphaRepeat, m.mapAlphaOffset, m.mapAlphaWrap, m.mapAlphaAnisotropy)
  						break
  					case 'mapAlphaRepeat':
  					case 'mapAlphaOffset':
  					case 'mapAlphaWrap':
  					case 'mapAlphaAnisotropy':
  						break
  					case 'flipSided':
  						json.side = BackSide
  						break
  					case 'doubleSided':
  						json.side = DoubleSide
  						break
  					case 'transparency':
  						console.warn('THREE.Loader.createMaterial: transparency has been renamed to opacity')
  						json.opacity = value
  						break
  					case 'depthTest':
  					case 'depthWrite':
  					case 'colorWrite':
  					case 'opacity':
  					case 'reflectivity':
  					case 'transparent':
  					case 'visible':
  					case 'wireframe':
  						json[name] = value
  						break
  					case 'vertexColors':
  						if (value === true) json.vertexColors = VertexColors
  						if (value === 'face') json.vertexColors = FaceColors
  						break
  					default:
  						console.error('THREE.Loader.createMaterial: Unsupported', name, value)
  						break
  				}
  			}

  			if (json.type === 'MeshBasicMaterial') delete json.emissive
  			if (json.type !== 'MeshPhongMaterial') delete json.specular

  			if (json.opacity < 1) json.transparent = true

  			materialLoader.setTextures(textures)

  			return materialLoader.parse(json)
  		}
  	})()

  })

  /**
   * @author Don McCurdy / https://www.donmccurdy.com
   */

  var LoaderUtils = {

  	decodeText: function (array) {
  		if (typeof TextDecoder !== 'undefined') {
  			return new TextDecoder().decode(array)
  		}

  		// Avoid the String.fromCharCode.apply(null, array) shortcut, which
  		// throws a "maximum call stack size exceeded" error for large arrays.

  		var s = ''

  		for (var i = 0, il = array.length; i < il; i++) {
  			// Implicitly assumes little-endian.
  			s += String.fromCharCode(array[i])
  		}

  		// Merges multi-byte utf-8 characters.
  		return decodeURIComponent(escape(s))
  	},

  	extractUrlBase: function (url) {
  		var index = url.lastIndexOf('/')

  		if (index === -1) return './'

  		return url.substr(0, index + 1)
  	}

  }

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author alteredq / http://alteredqualia.com/
   */

  function JSONLoader (manager) {
  	if (typeof manager === 'boolean') {
  		console.warn('THREE.JSONLoader: showStatus parameter has been removed from constructor.')
  		manager = undefined
  	}

  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager

  	this.withCredentials = false
  }

  Object.assign(JSONLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		var scope = this

  		var texturePath = this.texturePath && (typeof this.texturePath === 'string') ? this.texturePath : LoaderUtils.extractUrlBase(url)

  		var loader = new FileLoader(this.manager)
  		loader.setWithCredentials(this.withCredentials)
  		loader.load(url, function (text) {
  			var json = JSON.parse(text)
  			var metadata = json.metadata

  			if (metadata !== undefined) {
  				var type = metadata.type

  				if (type !== undefined) {
  					if (type.toLowerCase() === 'object') {
  						console.error('THREE.JSONLoader: ' + url + ' should be loaded with THREE.ObjectLoader instead.')
  						return
  					}
  				}
  			}

  			var object = scope.parse(json, texturePath)
  			onLoad(object.geometry, object.materials)
  		}, onProgress, onError)
  	},

  	setTexturePath: function (value) {
  		this.texturePath = value
  	},

  	parse: (function () {
  		function parseModel (json, geometry) {
  			function isBitSet (value, position) {
  				return value & (1 << position)
  			}

  			var i; var j; var fi

  				var offset; var zLength

  				var colorIndex; var normalIndex; var uvIndex; var materialIndex

  				var type
  				var isQuad
  				var hasMaterial
  				var hasFaceVertexUv
  				var hasFaceNormal; var hasFaceVertexNormal
  				var hasFaceColor; var hasFaceVertexColor

  				var vertex; var face; var faceA; var faceB; var hex; var normal

  				var uvLayer; var uv; var u; var v

  				var faces = json.faces
  				var vertices = json.vertices
  				var normals = json.normals
  				var colors = json.colors

  				var scale = json.scale

  				var nUvLayers = 0

  			if (json.uvs !== undefined) {
  				// disregard empty arrays

  				for (i = 0; i < json.uvs.length; i++) {
  					if (json.uvs[i].length) nUvLayers++
  				}

  				for (i = 0; i < nUvLayers; i++) {
  					geometry.faceVertexUvs[i] = []
  				}
  			}

  			offset = 0
  			zLength = vertices.length

  			while (offset < zLength) {
  				vertex = new Vector3()

  				vertex.x = vertices[offset++] * scale
  				vertex.y = vertices[offset++] * scale
  				vertex.z = vertices[offset++] * scale

  				geometry.vertices.push(vertex)
  			}

  			offset = 0
  			zLength = faces.length

  			while (offset < zLength) {
  				type = faces[offset++]

  				isQuad = isBitSet(type, 0)
  				hasMaterial = isBitSet(type, 1)
  				hasFaceVertexUv = isBitSet(type, 3)
  				hasFaceNormal = isBitSet(type, 4)
  				hasFaceVertexNormal = isBitSet(type, 5)
  				hasFaceColor = isBitSet(type, 6)
  				hasFaceVertexColor = isBitSet(type, 7)

  				// console.log("type", type, "bits", isQuad, hasMaterial, hasFaceVertexUv, hasFaceNormal, hasFaceVertexNormal, hasFaceColor, hasFaceVertexColor);

  				if (isQuad) {
  					faceA = new Face3()
  					faceA.a = faces[offset]
  					faceA.b = faces[offset + 1]
  					faceA.c = faces[offset + 3]

  					faceB = new Face3()
  					faceB.a = faces[offset + 1]
  					faceB.b = faces[offset + 2]
  					faceB.c = faces[offset + 3]

  					offset += 4

  					if (hasMaterial) {
  						materialIndex = faces[offset++]
  						faceA.materialIndex = materialIndex
  						faceB.materialIndex = materialIndex
  					}

  					// to get face <=> uv index correspondence

  					fi = geometry.faces.length

  					if (hasFaceVertexUv) {
  						for (i = 0; i < nUvLayers; i++) {
  							uvLayer = json.uvs[i]

  							geometry.faceVertexUvs[i][fi] = []
  							geometry.faceVertexUvs[i][fi + 1] = []

  							for (j = 0; j < 4; j++) {
  								uvIndex = faces[offset++]

  								u = uvLayer[uvIndex * 2]
  								v = uvLayer[uvIndex * 2 + 1]

  								uv = new Vector2(u, v)

  								if (j !== 2) geometry.faceVertexUvs[i][fi].push(uv)
  								if (j !== 0) geometry.faceVertexUvs[i][fi + 1].push(uv)
  							}
  						}
  					}

  					if (hasFaceNormal) {
  						normalIndex = faces[offset++] * 3

  						faceA.normal.set(
  							normals[normalIndex++],
  							normals[normalIndex++],
  							normals[normalIndex]
  						)

  						faceB.normal.copy(faceA.normal)
  					}

  					if (hasFaceVertexNormal) {
  						for (i = 0; i < 4; i++) {
  							normalIndex = faces[offset++] * 3

  							normal = new Vector3(
  								normals[normalIndex++],
  								normals[normalIndex++],
  								normals[normalIndex]
  							)

  							if (i !== 2) faceA.vertexNormals.push(normal)
  							if (i !== 0) faceB.vertexNormals.push(normal)
  						}
  					}

  					if (hasFaceColor) {
  						colorIndex = faces[offset++]
  						hex = colors[colorIndex]

  						faceA.color.setHex(hex)
  						faceB.color.setHex(hex)
  					}

  					if (hasFaceVertexColor) {
  						for (i = 0; i < 4; i++) {
  							colorIndex = faces[offset++]
  							hex = colors[colorIndex]

  							if (i !== 2) faceA.vertexColors.push(new Color(hex))
  							if (i !== 0) faceB.vertexColors.push(new Color(hex))
  						}
  					}

  					geometry.faces.push(faceA)
  					geometry.faces.push(faceB)
  				} else {
  					face = new Face3()
  					face.a = faces[offset++]
  					face.b = faces[offset++]
  					face.c = faces[offset++]

  					if (hasMaterial) {
  						materialIndex = faces[offset++]
  						face.materialIndex = materialIndex
  					}

  					// to get face <=> uv index correspondence

  					fi = geometry.faces.length

  					if (hasFaceVertexUv) {
  						for (i = 0; i < nUvLayers; i++) {
  							uvLayer = json.uvs[i]

  							geometry.faceVertexUvs[i][fi] = []

  							for (j = 0; j < 3; j++) {
  								uvIndex = faces[offset++]

  								u = uvLayer[uvIndex * 2]
  								v = uvLayer[uvIndex * 2 + 1]

  								uv = new Vector2(u, v)

  								geometry.faceVertexUvs[i][fi].push(uv)
  							}
  						}
  					}

  					if (hasFaceNormal) {
  						normalIndex = faces[offset++] * 3

  						face.normal.set(
  							normals[normalIndex++],
  							normals[normalIndex++],
  							normals[normalIndex]
  						)
  					}

  					if (hasFaceVertexNormal) {
  						for (i = 0; i < 3; i++) {
  							normalIndex = faces[offset++] * 3

  							normal = new Vector3(
  								normals[normalIndex++],
  								normals[normalIndex++],
  								normals[normalIndex]
  							)

  							face.vertexNormals.push(normal)
  						}
  					}

  					if (hasFaceColor) {
  						colorIndex = faces[offset++]
  						face.color.setHex(colors[colorIndex])
  					}

  					if (hasFaceVertexColor) {
  						for (i = 0; i < 3; i++) {
  							colorIndex = faces[offset++]
  							face.vertexColors.push(new Color(colors[colorIndex]))
  						}
  					}

  					geometry.faces.push(face)
  				}
  			}
  		}

  		function parseSkin (json, geometry) {
  			var influencesPerVertex = (json.influencesPerVertex !== undefined) ? json.influencesPerVertex : 2

  			if (json.skinWeights) {
  				for (var i = 0, l = json.skinWeights.length; i < l; i += influencesPerVertex) {
  					var x = json.skinWeights[i]
  					var y = (influencesPerVertex > 1) ? json.skinWeights[i + 1] : 0
  					var z = (influencesPerVertex > 2) ? json.skinWeights[i + 2] : 0
  					var w = (influencesPerVertex > 3) ? json.skinWeights[i + 3] : 0

  					geometry.skinWeights.push(new Vector4(x, y, z, w))
  				}
  			}

  			if (json.skinIndices) {
  				for (var i = 0, l = json.skinIndices.length; i < l; i += influencesPerVertex) {
  					var a = json.skinIndices[i]
  					var b = (influencesPerVertex > 1) ? json.skinIndices[i + 1] : 0
  					var c = (influencesPerVertex > 2) ? json.skinIndices[i + 2] : 0
  					var d = (influencesPerVertex > 3) ? json.skinIndices[i + 3] : 0

  					geometry.skinIndices.push(new Vector4(a, b, c, d))
  				}
  			}

  			geometry.bones = json.bones

  			if (geometry.bones && geometry.bones.length > 0 && (geometry.skinWeights.length !== geometry.skinIndices.length || geometry.skinIndices.length !== geometry.vertices.length)) {
  				console.warn('When skinning, number of vertices (' + geometry.vertices.length + '), skinIndices (' +
  					geometry.skinIndices.length + '), and skinWeights (' + geometry.skinWeights.length + ') should match.')
  			}
  		}

  		function parseMorphing (json, geometry) {
  			var scale = json.scale

  			if (json.morphTargets !== undefined) {
  				for (var i = 0, l = json.morphTargets.length; i < l; i++) {
  					geometry.morphTargets[i] = {}
  					geometry.morphTargets[i].name = json.morphTargets[i].name
  					geometry.morphTargets[i].vertices = []

  					var dstVertices = geometry.morphTargets[i].vertices
  					var srcVertices = json.morphTargets[i].vertices

  					for (var v = 0, vl = srcVertices.length; v < vl; v += 3) {
  						var vertex = new Vector3()
  						vertex.x = srcVertices[v] * scale
  						vertex.y = srcVertices[v + 1] * scale
  						vertex.z = srcVertices[v + 2] * scale

  						dstVertices.push(vertex)
  					}
  				}
  			}

  			if (json.morphColors !== undefined && json.morphColors.length > 0) {
  				console.warn('THREE.JSONLoader: "morphColors" no longer supported. Using them as face colors.')

  				var faces = geometry.faces
  				var morphColors = json.morphColors[0].colors

  				for (var i = 0, l = faces.length; i < l; i++) {
  					faces[i].color.fromArray(morphColors, i * 3)
  				}
  			}
  		}

  		function parseAnimations (json, geometry) {
  			var outputAnimations = []

  			// parse old style Bone/Hierarchy animations
  			var animations = []

  			if (json.animation !== undefined) {
  				animations.push(json.animation)
  			}

  			if (json.animations !== undefined) {
  				if (json.animations.length) {
  					animations = animations.concat(json.animations)
  				} else {
  					animations.push(json.animations)
  				}
  			}

  			for (var i = 0; i < animations.length; i++) {
  				var clip = AnimationClip.parseAnimation(animations[i], geometry.bones)
  				if (clip) outputAnimations.push(clip)
  			}

  			// parse implicit morph animations
  			if (geometry.morphTargets) {
  				// TODO: Figure out what an appropraite FPS is for morph target animations -- defaulting to 10, but really it is completely arbitrary.
  				var morphAnimationClips = AnimationClip.CreateClipsFromMorphTargetSequences(geometry.morphTargets, 10)
  				outputAnimations = outputAnimations.concat(morphAnimationClips)
  			}

  			if (outputAnimations.length > 0) geometry.animations = outputAnimations
  		}

  		return function parse (json, texturePath) {
  			if (json.data !== undefined) {
  				// Geometry 4.0 spec
  				json = json.data
  			}

  			if (json.scale !== undefined) {
  				json.scale = 1.0 / json.scale
  			} else {
  				json.scale = 1.0
  			}

  			var geometry = new Geometry()

  			parseModel(json, geometry)
  			parseSkin(json, geometry)
  			parseMorphing(json, geometry)
  			parseAnimations(json, geometry)

  			geometry.computeFaceNormals()
  			geometry.computeBoundingSphere()

  			if (json.materials === undefined || json.materials.length === 0) {
  				return { geometry: geometry }
  			} else {
  				var materials = Loader.prototype.initMaterials(json.materials, texturePath, this.crossOrigin)

  				return { geometry: geometry, materials: materials }
  			}
  		}
  	})()

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function ObjectLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  	this.texturePath = ''
  }

  Object.assign(ObjectLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		if (this.texturePath === '') {
  			this.texturePath = url.substring(0, url.lastIndexOf('/') + 1)
  		}

  		var scope = this

  		var loader = new FileLoader(scope.manager)
  		loader.load(url, function (text) {
  			var json = null

  			try {
  				json = JSON.parse(text)
  			} catch (error) {
  				if (onError !== undefined) onError(error)

  				console.error('THREE:ObjectLoader: Can\'t parse ' + url + '.', error.message)

  				return
  			}

  			var metadata = json.metadata

  			if (metadata === undefined || metadata.type === undefined || metadata.type.toLowerCase() === 'geometry') {
  				console.error('THREE.ObjectLoader: Can\'t load ' + url + '. Use THREE.JSONLoader instead.')
  				return
  			}

  			scope.parse(json, onLoad)
  		}, onProgress, onError)
  	},

  	setTexturePath: function (value) {
  		this.texturePath = value
  		return this
  	},

  	setCrossOrigin: function (value) {
  		this.crossOrigin = value
  		return this
  	},

  	parse: function (json, onLoad) {
  		var shapes = this.parseShape(json.shapes)
  		var geometries = this.parseGeometries(json.geometries, shapes)

  		var images = this.parseImages(json.images, function () {
  			if (onLoad !== undefined) onLoad(object)
  		})

  		var textures = this.parseTextures(json.textures, images)
  		var materials = this.parseMaterials(json.materials, textures)

  		var object = this.parseObject(json.object, geometries, materials)

  		if (json.animations) {
  			object.animations = this.parseAnimations(json.animations)
  		}

  		if (json.images === undefined || json.images.length === 0) {
  			if (onLoad !== undefined) onLoad(object)
  		}

  		return object
  	},

  	parseShape: function (json) {
  		var shapes = {}

  		if (json !== undefined) {
  			for (var i = 0, l = json.length; i < l; i++) {
  				var shape = new Shape().fromJSON(json[i])

  				shapes[shape.uuid] = shape
  			}
  		}

  		return shapes
  	},

  	parseGeometries: function (json, shapes) {
  		var geometries = {}

  		if (json !== undefined) {
  			var geometryLoader = new JSONLoader()
  			var bufferGeometryLoader = new BufferGeometryLoader()

  			for (var i = 0, l = json.length; i < l; i++) {
  				var geometry
  				var data = json[i]

  				switch (data.type) {
  					case 'PlaneGeometry':
  					case 'PlaneBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.width,
  							data.height,
  							data.widthSegments,
  							data.heightSegments
  						)

  						break

  					case 'BoxGeometry':
  					case 'BoxBufferGeometry':
  					case 'CubeGeometry': // backwards compatible

  						geometry = new Geometries[data.type](
  							data.width,
  							data.height,
  							data.depth,
  							data.widthSegments,
  							data.heightSegments,
  							data.depthSegments
  						)

  						break

  					case 'CircleGeometry':
  					case 'CircleBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.radius,
  							data.segments,
  							data.thetaStart,
  							data.thetaLength
  						)

  						break

  					case 'CylinderGeometry':
  					case 'CylinderBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.radiusTop,
  							data.radiusBottom,
  							data.height,
  							data.radialSegments,
  							data.heightSegments,
  							data.openEnded,
  							data.thetaStart,
  							data.thetaLength
  						)

  						break

  					case 'ConeGeometry':
  					case 'ConeBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.radius,
  							data.height,
  							data.radialSegments,
  							data.heightSegments,
  							data.openEnded,
  							data.thetaStart,
  							data.thetaLength
  						)

  						break

  					case 'SphereGeometry':
  					case 'SphereBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.radius,
  							data.widthSegments,
  							data.heightSegments,
  							data.phiStart,
  							data.phiLength,
  							data.thetaStart,
  							data.thetaLength
  						)

  						break

  					case 'DodecahedronGeometry':
  					case 'DodecahedronBufferGeometry':
  					case 'IcosahedronGeometry':
  					case 'IcosahedronBufferGeometry':
  					case 'OctahedronGeometry':
  					case 'OctahedronBufferGeometry':
  					case 'TetrahedronGeometry':
  					case 'TetrahedronBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.radius,
  							data.detail
  						)

  						break

  					case 'RingGeometry':
  					case 'RingBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.innerRadius,
  							data.outerRadius,
  							data.thetaSegments,
  							data.phiSegments,
  							data.thetaStart,
  							data.thetaLength
  						)

  						break

  					case 'TorusGeometry':
  					case 'TorusBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.radius,
  							data.tube,
  							data.radialSegments,
  							data.tubularSegments,
  							data.arc
  						)

  						break

  					case 'TorusKnotGeometry':
  					case 'TorusKnotBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.radius,
  							data.tube,
  							data.tubularSegments,
  							data.radialSegments,
  							data.p,
  							data.q
  						)

  						break

  					case 'LatheGeometry':
  					case 'LatheBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.points,
  							data.segments,
  							data.phiStart,
  							data.phiLength
  						)

  						break

  					case 'PolyhedronGeometry':
  					case 'PolyhedronBufferGeometry':

  						geometry = new Geometries[data.type](
  							data.vertices,
  							data.indices,
  							data.radius,
  							data.details
  						)

  						break

  					case 'ShapeGeometry':
  					case 'ShapeBufferGeometry':

  						var geometryShapes = []

  						for (var j = 0, jl = data.shapes.length; j < jl; j++) {
  							var shape = shapes[data.shapes[j]]

  							geometryShapes.push(shape)
  						}

  						geometry = new Geometries[data.type](
  							geometryShapes,
  							data.curveSegments
  						)

  						break

  					case 'ExtrudeGeometry':
  					case 'ExtrudeBufferGeometry':

  						var geometryShapes = []

  						for (var j = 0, jl = data.shapes.length; j < jl; j++) {
  							var shape = shapes[data.shapes[j]]

  							geometryShapes.push(shape)
  						}

  						var extrudePath = data.options.extrudePath

  						if (extrudePath !== undefined) {
  							data.options.extrudePath = new Curves[extrudePath.type]().fromJSON(extrudePath)
  						}

  						geometry = new Geometries[data.type](
  							geometryShapes,
  							data.options
  						)

  						break

  					case 'BufferGeometry':

  						geometry = bufferGeometryLoader.parse(data)

  						break

  					case 'Geometry':

  						geometry = geometryLoader.parse(data, this.texturePath).geometry

  						break

  					default:

  						console.warn('THREE.ObjectLoader: Unsupported geometry type "' + data.type + '"')

  						continue
  				}

  				geometry.uuid = data.uuid

  				if (data.name !== undefined) geometry.name = data.name
  				if (geometry.isBufferGeometry === true && data.userData !== undefined) geometry.userData = data.userData

  				geometries[data.uuid] = geometry
  			}
  		}

  		return geometries
  	},

  	parseMaterials: function (json, textures) {
  		var materials = {}

  		if (json !== undefined) {
  			var loader = new MaterialLoader()
  			loader.setTextures(textures)

  			for (var i = 0, l = json.length; i < l; i++) {
  				var data = json[i]

  				if (data.type === 'MultiMaterial') {
  					// Deprecated

  					var array = []

  					for (var j = 0; j < data.materials.length; j++) {
  						array.push(loader.parse(data.materials[j]))
  					}

  					materials[data.uuid] = array
  				} else {
  					materials[data.uuid] = loader.parse(data)
  				}
  			}
  		}

  		return materials
  	},

  	parseAnimations: function (json) {
  		var animations = []

  		for (var i = 0; i < json.length; i++) {
  			var data = json[i]

  			var clip = AnimationClip.parse(data)

  			if (data.uuid !== undefined) clip.uuid = data.uuid

  			animations.push(clip)
  		}

  		return animations
  	},

  	parseImages: function (json, onLoad) {
  		var scope = this
  		var images = {}

  		function loadImage (url) {
  			scope.manager.itemStart(url)

  			return loader.load(url, function () {
  				scope.manager.itemEnd(url)
  			}, undefined, function () {
  				scope.manager.itemEnd(url)
  				scope.manager.itemError(url)
  			})
  		}

  		if (json !== undefined && json.length > 0) {
  			var manager = new LoadingManager(onLoad)

  			var loader = new ImageLoader(manager)
  			loader.setCrossOrigin(this.crossOrigin)

  			for (var i = 0, l = json.length; i < l; i++) {
  				var image = json[i]
  				var path = /^(\/\/)|([a-z]+:(\/\/)?)/i.test(image.url) ? image.url : scope.texturePath + image.url

  				images[image.uuid] = loadImage(path)
  			}
  		}

  		return images
  	},

  	parseTextures: function (json, images) {
  		function parseConstant (value, type) {
  			if (typeof value === 'number') return value

  			console.warn('THREE.ObjectLoader.parseTexture: Constant should be in numeric form.', value)

  			return type[value]
  		}

  		var textures = {}

  		if (json !== undefined) {
  			for (var i = 0, l = json.length; i < l; i++) {
  				var data = json[i]

  				if (data.image === undefined) {
  					console.warn('THREE.ObjectLoader: No "image" specified for', data.uuid)
  				}

  				if (images[data.image] === undefined) {
  					console.warn('THREE.ObjectLoader: Undefined image', data.image)
  				}

  				var texture = new Texture(images[data.image])
  				texture.needsUpdate = true

  				texture.uuid = data.uuid

  				if (data.name !== undefined) texture.name = data.name

  				if (data.mapping !== undefined) texture.mapping = parseConstant(data.mapping, TEXTURE_MAPPING)

  				if (data.offset !== undefined) texture.offset.fromArray(data.offset)
  				if (data.repeat !== undefined) texture.repeat.fromArray(data.repeat)
  				if (data.center !== undefined) texture.center.fromArray(data.center)
  				if (data.rotation !== undefined) texture.rotation = data.rotation

  				if (data.wrap !== undefined) {
  					texture.wrapS = parseConstant(data.wrap[0], TEXTURE_WRAPPING)
  					texture.wrapT = parseConstant(data.wrap[1], TEXTURE_WRAPPING)
  				}

  				if (data.format !== undefined) texture.format = data.format

  				if (data.minFilter !== undefined) texture.minFilter = parseConstant(data.minFilter, TEXTURE_FILTER)
  				if (data.magFilter !== undefined) texture.magFilter = parseConstant(data.magFilter, TEXTURE_FILTER)
  				if (data.anisotropy !== undefined) texture.anisotropy = data.anisotropy

  				if (data.flipY !== undefined) texture.flipY = data.flipY

  				textures[data.uuid] = texture
  			}
  		}

  		return textures
  	},

  	parseObject: function (data, geometries, materials) {
  		var object

  		function getGeometry (name) {
  			if (geometries[name] === undefined) {
  				console.warn('THREE.ObjectLoader: Undefined geometry', name)
  			}

  			return geometries[name]
  		}

  		function getMaterial (name) {
  			if (name === undefined) return undefined

  			if (Array.isArray(name)) {
  				var array = []

  				for (var i = 0, l = name.length; i < l; i++) {
  					var uuid = name[i]

  					if (materials[uuid] === undefined) {
  						console.warn('THREE.ObjectLoader: Undefined material', uuid)
  					}

  					array.push(materials[uuid])
  				}

  				return array
  			}

  			if (materials[name] === undefined) {
  				console.warn('THREE.ObjectLoader: Undefined material', name)
  			}

  			return materials[name]
  		}

  		switch (data.type) {
  			case 'Scene':

  				object = new Scene()

  				if (data.background !== undefined) {
  					if (Number.isInteger(data.background)) {
  						object.background = new Color(data.background)
  					}
  				}

  				if (data.fog !== undefined) {
  					if (data.fog.type === 'Fog') {
  						object.fog = new Fog(data.fog.color, data.fog.near, data.fog.far)
  					} else if (data.fog.type === 'FogExp2') {
  						object.fog = new FogExp2(data.fog.color, data.fog.density)
  					}
  				}

  				break

  			case 'PerspectiveCamera':

  				object = new PerspectiveCamera(data.fov, data.aspect, data.near, data.far)

  				if (data.focus !== undefined) object.focus = data.focus
  				if (data.zoom !== undefined) object.zoom = data.zoom
  				if (data.filmGauge !== undefined) object.filmGauge = data.filmGauge
  				if (data.filmOffset !== undefined) object.filmOffset = data.filmOffset
  				if (data.view !== undefined) object.view = Object.assign({}, data.view)

  				break

  			case 'OrthographicCamera':

  				object = new OrthographicCamera(data.left, data.right, data.top, data.bottom, data.near, data.far)

  				if (data.zoom !== undefined) object.zoom = data.zoom
  				if (data.view !== undefined) object.view = Object.assign({}, data.view)

  				break

  			case 'AmbientLight':

  				object = new AmbientLight(data.color, data.intensity)

  				break

  			case 'DirectionalLight':

  				object = new DirectionalLight(data.color, data.intensity)

  				break

  			case 'PointLight':

  				object = new PointLight(data.color, data.intensity, data.distance, data.decay)

  				break

  			case 'RectAreaLight':

  				object = new RectAreaLight(data.color, data.intensity, data.width, data.height)

  				break

  			case 'SpotLight':

  				object = new SpotLight(data.color, data.intensity, data.distance, data.angle, data.penumbra, data.decay)

  				break

  			case 'HemisphereLight':

  				object = new HemisphereLight(data.color, data.groundColor, data.intensity)

  				break

  			case 'SkinnedMesh':

  				console.warn('THREE.ObjectLoader.parseObject() does not support SkinnedMesh yet.')

  			case 'Mesh':

  				var geometry = getGeometry(data.geometry)
  				var material = getMaterial(data.material)

  				if (geometry.bones && geometry.bones.length > 0) {
  					object = new SkinnedMesh(geometry, material)
  				} else {
  					object = new Mesh(geometry, material)
  				}

  				break

  			case 'LOD':

  				object = new LOD()

  				break

  			case 'Line':

  				object = new Line(getGeometry(data.geometry), getMaterial(data.material), data.mode)

  				break

  			case 'LineLoop':

  				object = new LineLoop(getGeometry(data.geometry), getMaterial(data.material))

  				break

  			case 'LineSegments':

  				object = new LineSegments(getGeometry(data.geometry), getMaterial(data.material))

  				break

  			case 'PointCloud':
  			case 'Points':

  				object = new Points(getGeometry(data.geometry), getMaterial(data.material))

  				break

  			case 'Sprite':

  				object = new Sprite(getMaterial(data.material))

  				break

  			case 'Group':

  				object = new Group()

  				break

  			default:

  				object = new Object3D()
  		}

  		object.uuid = data.uuid

  		if (data.name !== undefined) object.name = data.name

  		if (data.matrix !== undefined) {
  			object.matrix.fromArray(data.matrix)

  			if (data.matrixAutoUpdate !== undefined) object.matrixAutoUpdate = data.matrixAutoUpdate
  			if (object.matrixAutoUpdate) object.matrix.decompose(object.position, object.quaternion, object.scale)
  		} else {
  			if (data.position !== undefined) object.position.fromArray(data.position)
  			if (data.rotation !== undefined) object.rotation.fromArray(data.rotation)
  			if (data.quaternion !== undefined) object.quaternion.fromArray(data.quaternion)
  			if (data.scale !== undefined) object.scale.fromArray(data.scale)
  		}

  		if (data.castShadow !== undefined) object.castShadow = data.castShadow
  		if (data.receiveShadow !== undefined) object.receiveShadow = data.receiveShadow

  		if (data.shadow) {
  			if (data.shadow.bias !== undefined) object.shadow.bias = data.shadow.bias
  			if (data.shadow.radius !== undefined) object.shadow.radius = data.shadow.radius
  			if (data.shadow.mapSize !== undefined) object.shadow.mapSize.fromArray(data.shadow.mapSize)
  			if (data.shadow.camera !== undefined) object.shadow.camera = this.parseObject(data.shadow.camera)
  		}

  		if (data.visible !== undefined) object.visible = data.visible
  		if (data.frustumCulled !== undefined) object.frustumCulled = data.frustumCulled
  		if (data.renderOrder !== undefined) object.renderOrder = data.renderOrder
  		if (data.userData !== undefined) object.userData = data.userData

  		if (data.children !== undefined) {
  			var children = data.children

  			for (var i = 0; i < children.length; i++) {
  				object.add(this.parseObject(children[i], geometries, materials))
  			}
  		}

  		if (data.type === 'LOD') {
  			var levels = data.levels

  			for (var l = 0; l < levels.length; l++) {
  				var level = levels[l]
  				var child = object.getObjectByProperty('uuid', level.object)

  				if (child !== undefined) {
  					object.addLevel(child, level.distance)
  				}
  			}
  		}

  		return object
  	}

  })

  var TEXTURE_MAPPING = {
  	UVMapping: UVMapping,
  	CubeReflectionMapping: CubeReflectionMapping,
  	CubeRefractionMapping: CubeRefractionMapping,
  	EquirectangularReflectionMapping: EquirectangularReflectionMapping,
  	EquirectangularRefractionMapping: EquirectangularRefractionMapping,
  	SphericalReflectionMapping: SphericalReflectionMapping,
  	CubeUVReflectionMapping: CubeUVReflectionMapping,
  	CubeUVRefractionMapping: CubeUVRefractionMapping
  }

  var TEXTURE_WRAPPING = {
  	RepeatWrapping: RepeatWrapping,
  	ClampToEdgeWrapping: ClampToEdgeWrapping,
  	MirroredRepeatWrapping: MirroredRepeatWrapping
  }

  var TEXTURE_FILTER = {
  	NearestFilter: NearestFilter,
  	NearestMipMapNearestFilter: NearestMipMapNearestFilter,
  	NearestMipMapLinearFilter: NearestMipMapLinearFilter,
  	LinearFilter: LinearFilter,
  	LinearMipMapNearestFilter: LinearMipMapNearestFilter,
  	LinearMipMapLinearFilter: LinearMipMapLinearFilter
  }

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   * minimal class for proxing functions to Path. Replaces old "extractSubpaths()"
   **/

  function ShapePath () {
  	this.type = 'ShapePath'

  	this.color = new Color()

  	this.subPaths = []
  	this.currentPath = null
  }

  Object.assign(ShapePath.prototype, {

  	moveTo: function (x, y) {
  		this.currentPath = new Path()
  		this.subPaths.push(this.currentPath)
  		this.currentPath.moveTo(x, y)
  	},

  	lineTo: function (x, y) {
  		this.currentPath.lineTo(x, y)
  	},

  	quadraticCurveTo: function (aCPx, aCPy, aX, aY) {
  		this.currentPath.quadraticCurveTo(aCPx, aCPy, aX, aY)
  	},

  	bezierCurveTo: function (aCP1x, aCP1y, aCP2x, aCP2y, aX, aY) {
  		this.currentPath.bezierCurveTo(aCP1x, aCP1y, aCP2x, aCP2y, aX, aY)
  	},

  	splineThru: function (pts) {
  		this.currentPath.splineThru(pts)
  	},

  	toShapes: function (isCCW, noHoles) {
  		function toShapesNoHoles (inSubpaths) {
  			var shapes = []

  			for (var i = 0, l = inSubpaths.length; i < l; i++) {
  				var tmpPath = inSubpaths[i]

  				var tmpShape = new Shape()
  				tmpShape.curves = tmpPath.curves

  				shapes.push(tmpShape)
  			}

  			return shapes
  		}

  		function isPointInsidePolygon (inPt, inPolygon) {
  			var polyLen = inPolygon.length

  			// inPt on polygon contour => immediate success    or
  			// toggling of inside/outside at every single! intersection point of an edge
  			//  with the horizontal line through inPt, left of inPt
  			//  not counting lowerY endpoints of edges and whole edges on that line
  			var inside = false
  			for (var p = polyLen - 1, q = 0; q < polyLen; p = q++) {
  				var edgeLowPt = inPolygon[p]
  				var edgeHighPt = inPolygon[q]

  				var edgeDx = edgeHighPt.x - edgeLowPt.x
  				var edgeDy = edgeHighPt.y - edgeLowPt.y

  				if (Math.abs(edgeDy) > Number.EPSILON) {
  					// not parallel
  					if (edgeDy < 0) {
  						edgeLowPt = inPolygon[q]; edgeDx = -edgeDx
  						edgeHighPt = inPolygon[p]; edgeDy = -edgeDy
  					}
  					if ((inPt.y < edgeLowPt.y) || (inPt.y > edgeHighPt.y)) 		continue

  					if (inPt.y === edgeLowPt.y) {
  						if (inPt.x === edgeLowPt.x)		return	true		// inPt is on contour ?
  						// continue;				// no intersection or edgeLowPt => doesn't count !!!
  					} else {
  						var perpEdge = edgeDy * (inPt.x - edgeLowPt.x) - edgeDx * (inPt.y - edgeLowPt.y)
  						if (perpEdge === 0)				return	true		// inPt is on contour ?
  						if (perpEdge < 0) 				continue
  						inside = !inside		// true intersection left of inPt
  					}
  				} else {
  					// parallel or collinear
  					if (inPt.y !== edgeLowPt.y) 		continue			// parallel
  					// edge lies on the same horizontal line as inPt
  					if (((edgeHighPt.x <= inPt.x) && (inPt.x <= edgeLowPt.x)) ||
  						 ((edgeLowPt.x <= inPt.x) && (inPt.x <= edgeHighPt.x)))		return	true	// inPt: Point on contour !
  					// continue;
  				}
  			}

  			return	inside
  		}

  		var isClockWise = ShapeUtils.isClockWise

  		var subPaths = this.subPaths
  		if (subPaths.length === 0) return []

  		if (noHoles === true)	return	toShapesNoHoles(subPaths)

  		var solid; var tmpPath; var tmpShape; var shapes = []

  		if (subPaths.length === 1) {
  			tmpPath = subPaths[0]
  			tmpShape = new Shape()
  			tmpShape.curves = tmpPath.curves
  			shapes.push(tmpShape)
  			return shapes
  		}

  		var holesFirst = !isClockWise(subPaths[0].getPoints())
  		holesFirst = isCCW ? !holesFirst : holesFirst

  		// console.log("Holes first", holesFirst);

  		var betterShapeHoles = []
  		var newShapes = []
  		var newShapeHoles = []
  		var mainIdx = 0
  		var tmpPoints

  		newShapes[mainIdx] = undefined
  		newShapeHoles[mainIdx] = []

  		for (var i = 0, l = subPaths.length; i < l; i++) {
  			tmpPath = subPaths[i]
  			tmpPoints = tmpPath.getPoints()
  			solid = isClockWise(tmpPoints)
  			solid = isCCW ? !solid : solid

  			if (solid) {
  				if ((!holesFirst) && (newShapes[mainIdx]))	mainIdx++

  				newShapes[mainIdx] = { s: new Shape(), p: tmpPoints }
  				newShapes[mainIdx].s.curves = tmpPath.curves

  				if (holesFirst)	mainIdx++
  				newShapeHoles[mainIdx] = []

  				// console.log('cw', i);
  			} else {
  				newShapeHoles[mainIdx].push({ h: tmpPath, p: tmpPoints[0] })

  				// console.log('ccw', i);
  			}
  		}

  		// only Holes? -> probably all Shapes with wrong orientation
  		if (!newShapes[0])	return	toShapesNoHoles(subPaths)

  		if (newShapes.length > 1) {
  			var ambiguous = false
  			var toChange = []

  			for (var sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx++) {
  				betterShapeHoles[sIdx] = []
  			}

  			for (var sIdx = 0, sLen = newShapes.length; sIdx < sLen; sIdx++) {
  				var sho = newShapeHoles[sIdx]

  				for (var hIdx = 0; hIdx < sho.length; hIdx++) {
  					var ho = sho[hIdx]
  					var hole_unassigned = true

  					for (var s2Idx = 0; s2Idx < newShapes.length; s2Idx++) {
  						if (isPointInsidePolygon(ho.p, newShapes[s2Idx].p)) {
  							if (sIdx !== s2Idx)	toChange.push({ froms: sIdx, tos: s2Idx, hole: hIdx })
  							if (hole_unassigned) {
  								hole_unassigned = false
  								betterShapeHoles[s2Idx].push(ho)
  							} else {
  								ambiguous = true
  							}
  						}
  					}
  					if (hole_unassigned) {
  						betterShapeHoles[sIdx].push(ho)
  					}
  				}
  			}
  			// console.log("ambiguous: ", ambiguous);
  			if (toChange.length > 0) {
  				// console.log("to change: ", toChange);
  				if (!ambiguous)	newShapeHoles = betterShapeHoles
  			}
  		}

  		var tmpHoles

  		for (var i = 0, il = newShapes.length; i < il; i++) {
  			tmpShape = newShapes[i].s
  			shapes.push(tmpShape)
  			tmpHoles = newShapeHoles[i]

  			for (var j = 0, jl = tmpHoles.length; j < jl; j++) {
  				tmpShape.holes.push(tmpHoles[j].h)
  			}
  		}

  		// console.log("shape", shapes);

  		return shapes
  	}

  })

  /**
   * @author zz85 / http://www.lab4games.net/zz85/blog
   * @author mrdoob / http://mrdoob.com/
   */

  function Font (data) {
  	this.type = 'Font'

  	this.data = data
  }

  Object.assign(Font.prototype, {

  	isFont: true,

  	generateShapes: function (text, size, divisions) {
  		if (size === undefined) size = 100
  		if (divisions === undefined) divisions = 4

  		var shapes = []
  		var paths = createPaths(text, size, divisions, this.data)

  		for (var p = 0, pl = paths.length; p < pl; p++) {
  			Array.prototype.push.apply(shapes, paths[p].toShapes())
  		}

  		return shapes
  	}

  })

  function createPaths (text, size, divisions, data) {
  	var chars = Array.from ? Array.from(text) : String(text).split('') // see #13988
  	var scale = size / data.resolution
  	var line_height = (data.boundingBox.yMax - data.boundingBox.yMin + data.underlineThickness) * scale

  	var paths = []

  	var offsetX = 0; var offsetY = 0

  	for (var i = 0; i < chars.length; i++) {
  		var char = chars[i]

  		if (char === '\n') {
  			offsetX = 0
  			offsetY -= line_height
  		} else {
  			var ret = createPath(char, divisions, scale, offsetX, offsetY, data)
  			offsetX += ret.offsetX
  			paths.push(ret.path)
  		}
  	}

  	return paths
  }

  function createPath (char, divisions, scale, offsetX, offsetY, data) {
  	var glyph = data.glyphs[char] || data.glyphs['?']

  	if (!glyph) return

  	var path = new ShapePath()

  	var x, y, cpx, cpy, cpx1, cpy1, cpx2, cpy2

  	if (glyph.o) {
  		var outline = glyph._cachedOutline || (glyph._cachedOutline = glyph.o.split(' '))

  		for (var i = 0, l = outline.length; i < l;) {
  			var action = outline[i++]

  			switch (action) {
  				case 'm': // moveTo

  					x = outline[i++] * scale + offsetX
  					y = outline[i++] * scale + offsetY

  					path.moveTo(x, y)

  					break

  				case 'l': // lineTo

  					x = outline[i++] * scale + offsetX
  					y = outline[i++] * scale + offsetY

  					path.lineTo(x, y)

  					break

  				case 'q': // quadraticCurveTo

  					cpx = outline[i++] * scale + offsetX
  					cpy = outline[i++] * scale + offsetY
  					cpx1 = outline[i++] * scale + offsetX
  					cpy1 = outline[i++] * scale + offsetY

  					path.quadraticCurveTo(cpx1, cpy1, cpx, cpy)

  					break

  				case 'b': // bezierCurveTo

  					cpx = outline[i++] * scale + offsetX
  					cpy = outline[i++] * scale + offsetY
  					cpx1 = outline[i++] * scale + offsetX
  					cpy1 = outline[i++] * scale + offsetY
  					cpx2 = outline[i++] * scale + offsetX
  					cpy2 = outline[i++] * scale + offsetY

  					path.bezierCurveTo(cpx1, cpy1, cpx2, cpy2, cpx, cpy)

  					break
  			}
  		}
  	}

  	return { offsetX: glyph.ha * scale, path: path }
  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function FontLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  }

  Object.assign(FontLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		var scope = this

  		var loader = new FileLoader(this.manager)
  		loader.setPath(this.path)
  		loader.load(url, function (text) {
  			var json

  			try {
  				json = JSON.parse(text)
  			} catch (e) {
  				console.warn('THREE.FontLoader: typeface.js support is being deprecated. Use typeface.json instead.')
  				json = JSON.parse(text.substring(65, text.length - 2))
  			}

  			var font = scope.parse(json)

  			if (onLoad) onLoad(font)
  		}, onProgress, onError)
  	},

  	parse: function (json) {
  		return new Font(json)
  	},

  	setPath: function (value) {
  		this.path = value
  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  var context

  var AudioContext = {

  	getContext: function () {
  		if (context === undefined) {
  			context = new (window.AudioContext || window.webkitAudioContext)()
  		}

  		return context
  	},

  	setContext: function (value) {
  		context = value
  	}

  }

  /**
   * @author Reece Aaron Lecrivain / http://reecenotes.com/
   */

  function AudioLoader (manager) {
  	this.manager = (manager !== undefined) ? manager : DefaultLoadingManager
  }

  Object.assign(AudioLoader.prototype, {

  	load: function (url, onLoad, onProgress, onError) {
  		var loader = new FileLoader(this.manager)
  		loader.setResponseType('arraybuffer')
  		loader.load(url, function (buffer) {
  			var context = AudioContext.getContext()

  			context.decodeAudioData(buffer, function (audioBuffer) {
  				onLoad(audioBuffer)
  			})
  		}, onProgress, onError)
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function StereoCamera () {
  	this.type = 'StereoCamera'

  	this.aspect = 1

  	this.eyeSep = 0.064

  	this.cameraL = new PerspectiveCamera()
  	this.cameraL.layers.enable(1)
  	this.cameraL.matrixAutoUpdate = false

  	this.cameraR = new PerspectiveCamera()
  	this.cameraR.layers.enable(2)
  	this.cameraR.matrixAutoUpdate = false
  }

  Object.assign(StereoCamera.prototype, {

  	update: (function () {
  		var instance, focus, fov, aspect, near, far, zoom, eyeSep

  		var eyeRight = new Matrix4()
  		var eyeLeft = new Matrix4()

  		return function update (camera) {
  			var needsUpdate = instance !== this || focus !== camera.focus || fov !== camera.fov ||
  												aspect !== camera.aspect * this.aspect || near !== camera.near ||
  												far !== camera.far || zoom !== camera.zoom || eyeSep !== this.eyeSep

  			if (needsUpdate) {
  				instance = this
  				focus = camera.focus
  				fov = camera.fov
  				aspect = camera.aspect * this.aspect
  				near = camera.near
  				far = camera.far
  				zoom = camera.zoom

  				// Off-axis stereoscopic effect based on
  				// http://paulbourke.net/stereographics/stereorender/

  				var projectionMatrix = camera.projectionMatrix.clone()
  				eyeSep = this.eyeSep / 2
  				var eyeSepOnProjection = eyeSep * near / focus
  				var ymax = (near * Math.tan(_Math.DEG2RAD * fov * 0.5)) / zoom
  				var xmin, xmax

  				// translate xOffset

  				eyeLeft.elements[12] = -eyeSep
  				eyeRight.elements[12] = eyeSep

  				// for left eye

  				xmin = -ymax * aspect + eyeSepOnProjection
  				xmax = ymax * aspect + eyeSepOnProjection

  				projectionMatrix.elements[0] = 2 * near / (xmax - xmin)
  				projectionMatrix.elements[8] = (xmax + xmin) / (xmax - xmin)

  				this.cameraL.projectionMatrix.copy(projectionMatrix)

  				// for right eye

  				xmin = -ymax * aspect - eyeSepOnProjection
  				xmax = ymax * aspect - eyeSepOnProjection

  				projectionMatrix.elements[0] = 2 * near / (xmax - xmin)
  				projectionMatrix.elements[8] = (xmax + xmin) / (xmax - xmin)

  				this.cameraR.projectionMatrix.copy(projectionMatrix)
  			}

  			this.cameraL.matrixWorld.copy(camera.matrixWorld).multiply(eyeLeft)
  			this.cameraR.matrixWorld.copy(camera.matrixWorld).multiply(eyeRight)
  		}
  	})()

  })

  /**
   * Camera for rendering cube maps
   *	- renders scene into axis-aligned cube
   *
   * @author alteredq / http://alteredqualia.com/
   */

  function CubeCamera (near, far, cubeResolution) {
  	Object3D.call(this)

  	this.type = 'CubeCamera'

  	var fov = 90; var aspect = 1

  	var cameraPX = new PerspectiveCamera(fov, aspect, near, far)
  	cameraPX.up.set(0, -1, 0)
  	cameraPX.lookAt(new Vector3(1, 0, 0))
  	this.add(cameraPX)

  	var cameraNX = new PerspectiveCamera(fov, aspect, near, far)
  	cameraNX.up.set(0, -1, 0)
  	cameraNX.lookAt(new Vector3(-1, 0, 0))
  	this.add(cameraNX)

  	var cameraPY = new PerspectiveCamera(fov, aspect, near, far)
  	cameraPY.up.set(0, 0, 1)
  	cameraPY.lookAt(new Vector3(0, 1, 0))
  	this.add(cameraPY)

  	var cameraNY = new PerspectiveCamera(fov, aspect, near, far)
  	cameraNY.up.set(0, 0, -1)
  	cameraNY.lookAt(new Vector3(0, -1, 0))
  	this.add(cameraNY)

  	var cameraPZ = new PerspectiveCamera(fov, aspect, near, far)
  	cameraPZ.up.set(0, -1, 0)
  	cameraPZ.lookAt(new Vector3(0, 0, 1))
  	this.add(cameraPZ)

  	var cameraNZ = new PerspectiveCamera(fov, aspect, near, far)
  	cameraNZ.up.set(0, -1, 0)
  	cameraNZ.lookAt(new Vector3(0, 0, -1))
  	this.add(cameraNZ)

  	var options = { format: RGBFormat, magFilter: LinearFilter, minFilter: LinearFilter }

  	this.renderTarget = new WebGLRenderTargetCube(cubeResolution, cubeResolution, options)
  	this.renderTarget.texture.name = 'CubeCamera'

  	this.update = function (renderer, scene) {
  		if (this.parent === null) this.updateMatrixWorld()

  		var renderTarget = this.renderTarget
  		var generateMipmaps = renderTarget.texture.generateMipmaps

  		renderTarget.texture.generateMipmaps = false

  		renderTarget.activeCubeFace = 0
  		renderer.render(scene, cameraPX, renderTarget)

  		renderTarget.activeCubeFace = 1
  		renderer.render(scene, cameraNX, renderTarget)

  		renderTarget.activeCubeFace = 2
  		renderer.render(scene, cameraPY, renderTarget)

  		renderTarget.activeCubeFace = 3
  		renderer.render(scene, cameraNY, renderTarget)

  		renderTarget.activeCubeFace = 4
  		renderer.render(scene, cameraPZ, renderTarget)

  		renderTarget.texture.generateMipmaps = generateMipmaps

  		renderTarget.activeCubeFace = 5
  		renderer.render(scene, cameraNZ, renderTarget)

  		renderer.setRenderTarget(null)
  	}

  	this.clear = function (renderer, color, depth, stencil) {
  		var renderTarget = this.renderTarget

  		for (var i = 0; i < 6; i++) {
  			renderTarget.activeCubeFace = i
  			renderer.setRenderTarget(renderTarget)

  			renderer.clear(color, depth, stencil)
  		}

  		renderer.setRenderTarget(null)
  	}
  }

  CubeCamera.prototype = Object.create(Object3D.prototype)
  CubeCamera.prototype.constructor = CubeCamera

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function AudioListener () {
  	Object3D.call(this)

  	this.type = 'AudioListener'

  	this.context = AudioContext.getContext()

  	this.gain = this.context.createGain()
  	this.gain.connect(this.context.destination)

  	this.filter = null
  }

  AudioListener.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: AudioListener,

  	getInput: function () {
  		return this.gain
  	},

  	removeFilter: function () {
  		if (this.filter !== null) {
  			this.gain.disconnect(this.filter)
  			this.filter.disconnect(this.context.destination)
  			this.gain.connect(this.context.destination)
  			this.filter = null
  		}
  	},

  	getFilter: function () {
  		return this.filter
  	},

  	setFilter: function (value) {
  		if (this.filter !== null) {
  			this.gain.disconnect(this.filter)
  			this.filter.disconnect(this.context.destination)
  		} else {
  			this.gain.disconnect(this.context.destination)
  		}

  		this.filter = value
  		this.gain.connect(this.filter)
  		this.filter.connect(this.context.destination)
  	},

  	getMasterVolume: function () {
  		return this.gain.gain.value
  	},

  	setMasterVolume: function (value) {
  		this.gain.gain.setTargetAtTime(value, this.context.currentTime, 0.01)
  	},

  	updateMatrixWorld: (function () {
  		var position = new Vector3()
  		var quaternion = new Quaternion()
  		var scale = new Vector3()

  		var orientation = new Vector3()

  		return function updateMatrixWorld (force) {
  			Object3D.prototype.updateMatrixWorld.call(this, force)

  			var listener = this.context.listener
  			var up = this.up

  			this.matrixWorld.decompose(position, quaternion, scale)

  			orientation.set(0, 0, -1).applyQuaternion(quaternion)

  			if (listener.positionX) {
  				listener.positionX.setValueAtTime(position.x, this.context.currentTime)
  				listener.positionY.setValueAtTime(position.y, this.context.currentTime)
  				listener.positionZ.setValueAtTime(position.z, this.context.currentTime)
  				listener.forwardX.setValueAtTime(orientation.x, this.context.currentTime)
  				listener.forwardY.setValueAtTime(orientation.y, this.context.currentTime)
  				listener.forwardZ.setValueAtTime(orientation.z, this.context.currentTime)
  				listener.upX.setValueAtTime(up.x, this.context.currentTime)
  				listener.upY.setValueAtTime(up.y, this.context.currentTime)
  				listener.upZ.setValueAtTime(up.z, this.context.currentTime)
  			} else {
  				listener.setPosition(position.x, position.y, position.z)
  				listener.setOrientation(orientation.x, orientation.y, orientation.z, up.x, up.y, up.z)
  			}
  		}
  	})()

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author Reece Aaron Lecrivain / http://reecenotes.com/
   */

  function Audio (listener) {
  	Object3D.call(this)

  	this.type = 'Audio'

  	this.context = listener.context

  	this.gain = this.context.createGain()
  	this.gain.connect(listener.getInput())

  	this.autoplay = false

  	this.buffer = null
  	this.loop = false
  	this.startTime = 0
  	this.offset = 0
  	this.playbackRate = 1
  	this.isPlaying = false
  	this.hasPlaybackControl = true
  	this.sourceType = 'empty'

  	this.filters = []
  }

  Audio.prototype = Object.assign(Object.create(Object3D.prototype), {

  	constructor: Audio,

  	getOutput: function () {
  		return this.gain
  	},

  	setNodeSource: function (audioNode) {
  		this.hasPlaybackControl = false
  		this.sourceType = 'audioNode'
  		this.source = audioNode
  		this.connect()

  		return this
  	},

  	setMediaElementSource: function (mediaElement) {
  		this.hasPlaybackControl = false
  		this.sourceType = 'mediaNode'
  		this.source = this.context.createMediaElementSource(mediaElement)
  		this.connect()

  		return this
  	},

  	setBuffer: function (audioBuffer) {
  		this.buffer = audioBuffer
  		this.sourceType = 'buffer'

  		if (this.autoplay) this.play()

  		return this
  	},

  	play: function () {
  		if (this.isPlaying === true) {
  			console.warn('THREE.Audio: Audio is already playing.')
  			return
  		}

  		if (this.hasPlaybackControl === false) {
  			console.warn('THREE.Audio: this Audio has no playback control.')
  			return
  		}

  		var source = this.context.createBufferSource()

  		source.buffer = this.buffer
  		source.loop = this.loop
  		source.onended = this.onEnded.bind(this)
  		source.playbackRate.setValueAtTime(this.playbackRate, this.startTime)
  		this.startTime = this.context.currentTime
  		source.start(this.startTime, this.offset)

  		this.isPlaying = true

  		this.source = source

  		return this.connect()
  	},

  	pause: function () {
  		if (this.hasPlaybackControl === false) {
  			console.warn('THREE.Audio: this Audio has no playback control.')
  			return
  		}

  		if (this.isPlaying === true) {
  			this.source.stop()
  			this.offset += (this.context.currentTime - this.startTime) * this.playbackRate
  			this.isPlaying = false
  		}

  		return this
  	},

  	stop: function () {
  		if (this.hasPlaybackControl === false) {
  			console.warn('THREE.Audio: this Audio has no playback control.')
  			return
  		}

  		this.source.stop()
  		this.offset = 0
  		this.isPlaying = false

  		return this
  	},

  	connect: function () {
  		if (this.filters.length > 0) {
  			this.source.connect(this.filters[0])

  			for (var i = 1, l = this.filters.length; i < l; i++) {
  				this.filters[i - 1].connect(this.filters[i])
  			}

  			this.filters[this.filters.length - 1].connect(this.getOutput())
  		} else {
  			this.source.connect(this.getOutput())
  		}

  		return this
  	},

  	disconnect: function () {
  		if (this.filters.length > 0) {
  			this.source.disconnect(this.filters[0])

  			for (var i = 1, l = this.filters.length; i < l; i++) {
  				this.filters[i - 1].disconnect(this.filters[i])
  			}

  			this.filters[this.filters.length - 1].disconnect(this.getOutput())
  		} else {
  			this.source.disconnect(this.getOutput())
  		}

  		return this
  	},

  	getFilters: function () {
  		return this.filters
  	},

  	setFilters: function (value) {
  		if (!value) value = []

  		if (this.isPlaying === true) {
  			this.disconnect()
  			this.filters = value
  			this.connect()
  		} else {
  			this.filters = value
  		}

  		return this
  	},

  	getFilter: function () {
  		return this.getFilters()[0]
  	},

  	setFilter: function (filter) {
  		return this.setFilters(filter ? [filter] : [])
  	},

  	setPlaybackRate: function (value) {
  		if (this.hasPlaybackControl === false) {
  			console.warn('THREE.Audio: this Audio has no playback control.')
  			return
  		}

  		this.playbackRate = value

  		if (this.isPlaying === true) {
  			this.source.playbackRate.setValueAtTime(this.playbackRate, this.context.currentTime)
  		}

  		return this
  	},

  	getPlaybackRate: function () {
  		return this.playbackRate
  	},

  	onEnded: function () {
  		this.isPlaying = false
  	},

  	getLoop: function () {
  		if (this.hasPlaybackControl === false) {
  			console.warn('THREE.Audio: this Audio has no playback control.')
  			return false
  		}

  		return this.loop
  	},

  	setLoop: function (value) {
  		if (this.hasPlaybackControl === false) {
  			console.warn('THREE.Audio: this Audio has no playback control.')
  			return
  		}

  		this.loop = value

  		if (this.isPlaying === true) {
  			this.source.loop = this.loop
  		}

  		return this
  	},

  	getVolume: function () {
  		return this.gain.gain.value
  	},

  	setVolume: function (value) {
  		this.gain.gain.setTargetAtTime(value, this.context.currentTime, 0.01)

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function PositionalAudio (listener) {
  	Audio.call(this, listener)

  	this.panner = this.context.createPanner()
  	this.panner.connect(this.gain)
  }

  PositionalAudio.prototype = Object.assign(Object.create(Audio.prototype), {

  	constructor: PositionalAudio,

  	getOutput: function () {
  		return this.panner
  	},

  	getRefDistance: function () {
  		return this.panner.refDistance
  	},

  	setRefDistance: function (value) {
  		this.panner.refDistance = value
  	},

  	getRolloffFactor: function () {
  		return this.panner.rolloffFactor
  	},

  	setRolloffFactor: function (value) {
  		this.panner.rolloffFactor = value
  	},

  	getDistanceModel: function () {
  		return this.panner.distanceModel
  	},

  	setDistanceModel: function (value) {
  		this.panner.distanceModel = value
  	},

  	getMaxDistance: function () {
  		return this.panner.maxDistance
  	},

  	setMaxDistance: function (value) {
  		this.panner.maxDistance = value
  	},

  	updateMatrixWorld: (function () {
  		var position = new Vector3()

  		return function updateMatrixWorld (force) {
  			Object3D.prototype.updateMatrixWorld.call(this, force)

  			position.setFromMatrixPosition(this.matrixWorld)

  			this.panner.setPosition(position.x, position.y, position.z)
  		}
  	})()

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function AudioAnalyser (audio, fftSize) {
  	this.analyser = audio.context.createAnalyser()
  	this.analyser.fftSize = fftSize !== undefined ? fftSize : 2048

  	this.data = new Uint8Array(this.analyser.frequencyBinCount)

  	audio.getOutput().connect(this.analyser)
  }

  Object.assign(AudioAnalyser.prototype, {

  	getFrequencyData: function () {
  		this.analyser.getByteFrequencyData(this.data)

  		return this.data
  	},

  	getAverageFrequency: function () {
  		var value = 0; var data = this.getFrequencyData()

  		for (var i = 0; i < data.length; i++) {
  			value += data[i]
  		}

  		return value / data.length
  	}

  })

  /**
   *
   * Buffered scene graph property that allows weighted accumulation.
   *
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function PropertyMixer (binding, typeName, valueSize) {
  	this.binding = binding
  	this.valueSize = valueSize

  	var bufferType = Float64Array
  		var mixFunction

  	switch (typeName) {
  		case 'quaternion':
  			mixFunction = this._slerp
  			break

  		case 'string':
  		case 'bool':
  			bufferType = Array
  			mixFunction = this._select
  			break

  		default:
  			mixFunction = this._lerp
  	}

  	this.buffer = new bufferType(valueSize * 4)
  	// layout: [ incoming | accu0 | accu1 | orig ]
  	//
  	// interpolators can use .buffer as their .result
  	// the data then goes to 'incoming'
  	//
  	// 'accu0' and 'accu1' are used frame-interleaved for
  	// the cumulative result and are compared to detect
  	// changes
  	//
  	// 'orig' stores the original state of the property

  	this._mixBufferRegion = mixFunction

  	this.cumulativeWeight = 0

  	this.useCount = 0
  	this.referenceCount = 0
  }

  Object.assign(PropertyMixer.prototype, {

  	// accumulate data in the 'incoming' region into 'accu<i>'
  	accumulate: function (accuIndex, weight) {
  		// note: happily accumulating nothing when weight = 0, the caller knows
  		// the weight and shouldn't have made the call in the first place

  		var buffer = this.buffer
  			var stride = this.valueSize
  			var offset = accuIndex * stride + stride

  			var currentWeight = this.cumulativeWeight

  		if (currentWeight === 0) {
  			// accuN := incoming * weight

  			for (var i = 0; i !== stride; ++i) {
  				buffer[offset + i] = buffer[i]
  			}

  			currentWeight = weight
  		} else {
  			// accuN := accuN + incoming * weight

  			currentWeight += weight
  			var mix = weight / currentWeight
  			this._mixBufferRegion(buffer, offset, 0, mix, stride)
  		}

  		this.cumulativeWeight = currentWeight
  	},

  	// apply the state of 'accu<i>' to the binding when accus differ
  	apply: function (accuIndex) {
  		var stride = this.valueSize
  			var buffer = this.buffer
  			var offset = accuIndex * stride + stride

  			var weight = this.cumulativeWeight

  			var binding = this.binding

  		this.cumulativeWeight = 0

  		if (weight < 1) {
  			// accuN := accuN + original * ( 1 - cumulativeWeight )

  			var originalValueOffset = stride * 3

  			this._mixBufferRegion(
  				buffer, offset, originalValueOffset, 1 - weight, stride)
  		}

  		for (var i = stride, e = stride + stride; i !== e; ++i) {
  			if (buffer[i] !== buffer[i + stride]) {
  				// value has changed -> update scene graph

  				binding.setValue(buffer, offset)
  				break
  			}
  		}
  	},

  	// remember the state of the bound property and copy it to both accus
  	saveOriginalState: function () {
  		var binding = this.binding

  		var buffer = this.buffer
  			var stride = this.valueSize

  			var originalValueOffset = stride * 3

  		binding.getValue(buffer, originalValueOffset)

  		// accu[0..1] := orig -- initially detect changes against the original
  		for (var i = stride, e = originalValueOffset; i !== e; ++i) {
  			buffer[i] = buffer[originalValueOffset + (i % stride)]
  		}

  		this.cumulativeWeight = 0
  	},

  	// apply the state previously taken via 'saveOriginalState' to the binding
  	restoreOriginalState: function () {
  		var originalValueOffset = this.valueSize * 3
  		this.binding.setValue(this.buffer, originalValueOffset)
  	},

  	// mix functions

  	_select: function (buffer, dstOffset, srcOffset, t, stride) {
  		if (t >= 0.5) {
  			for (var i = 0; i !== stride; ++i) {
  				buffer[dstOffset + i] = buffer[srcOffset + i]
  			}
  		}
  	},

  	_slerp: function (buffer, dstOffset, srcOffset, t) {
  		Quaternion.slerpFlat(buffer, dstOffset, buffer, dstOffset, buffer, srcOffset, t)
  	},

  	_lerp: function (buffer, dstOffset, srcOffset, t, stride) {
  		var s = 1 - t

  		for (var i = 0; i !== stride; ++i) {
  			var j = dstOffset + i

  			buffer[j] = buffer[j] * s + buffer[srcOffset + i] * t
  		}
  	}

  })

  /**
   *
   * A reference to a real property in the scene graph.
   *
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  // Characters [].:/ are reserved for track binding syntax.
  var RESERVED_CHARS_RE = '\\[\\]\\.:\\/'

  function Composite (targetGroup, path, optionalParsedPath) {
  	var parsedPath = optionalParsedPath || PropertyBinding.parseTrackName(path)

  	this._targetGroup = targetGroup
  	this._bindings = targetGroup.subscribe_(path, parsedPath)
  }

  Object.assign(Composite.prototype, {

  	getValue: function (array, offset) {
  		this.bind() // bind all binding

  		var firstValidIndex = this._targetGroup.nCachedObjects_
  			var binding = this._bindings[firstValidIndex]

  		// and only call .getValue on the first
  		if (binding !== undefined) binding.getValue(array, offset)
  	},

  	setValue: function (array, offset) {
  		var bindings = this._bindings

  		for (var i = this._targetGroup.nCachedObjects_,
  				  n = bindings.length; i !== n; ++i) {
  			bindings[i].setValue(array, offset)
  		}
  	},

  	bind: function () {
  		var bindings = this._bindings

  		for (var i = this._targetGroup.nCachedObjects_,
  				  n = bindings.length; i !== n; ++i) {
  			bindings[i].bind()
  		}
  	},

  	unbind: function () {
  		var bindings = this._bindings

  		for (var i = this._targetGroup.nCachedObjects_,
  				  n = bindings.length; i !== n; ++i) {
  			bindings[i].unbind()
  		}
  	}

  })

  function PropertyBinding (rootNode, path, parsedPath) {
  	this.path = path
  	this.parsedPath = parsedPath || PropertyBinding.parseTrackName(path)

  	this.node = PropertyBinding.findNode(rootNode, this.parsedPath.nodeName) || rootNode

  	this.rootNode = rootNode
  }

  Object.assign(PropertyBinding, {

  	Composite: Composite,

  	create: function (root, path, parsedPath) {
  		if (!(root && root.isAnimationObjectGroup)) {
  			return new PropertyBinding(root, path, parsedPath)
  		} else {
  			return new PropertyBinding.Composite(root, path, parsedPath)
  		}
  	},

  	/**
  	 * Replaces spaces with underscores and removes unsupported characters from
  	 * node names, to ensure compatibility with parseTrackName().
  	 *
  	 * @param  {string} name Node name to be sanitized.
  	 * @return {string}
  	 */
  	sanitizeNodeName: (function () {
  		var reservedRe = new RegExp('[' + RESERVED_CHARS_RE + ']', 'g')

  		return function sanitizeNodeName (name) {
  			return name.replace(/\s/g, '_').replace(reservedRe, '')
  		}
  	}()),

  	parseTrackName: (function () {
  		// Attempts to allow node names from any language. ES5's `\w` regexp matches
  		// only latin characters, and the unicode \p{L} is not yet supported. So
  		// instead, we exclude reserved characters and match everything else.
  		var wordChar = '[^' + RESERVED_CHARS_RE + ']'
  		var wordCharOrDot = '[^' + RESERVED_CHARS_RE.replace('\\.', '') + ']'

  		// Parent directories, delimited by '/' or ':'. Currently unused, but must
  		// be matched to parse the rest of the track name.
  		var directoryRe = /((?:WC+[\/:])*)/.source.replace('WC', wordChar)

  		// Target node. May contain word characters (a-zA-Z0-9_) and '.' or '-'.
  		var nodeRe = /(WCOD+)?/.source.replace('WCOD', wordCharOrDot)

  		// Object on target node, and accessor. May not contain reserved
  		// characters. Accessor may contain any character except closing bracket.
  		var objectRe = /(?:\.(WC+)(?:\[(.+)\])?)?/.source.replace('WC', wordChar)

  		// Property and accessor. May not contain reserved characters. Accessor may
  		// contain any non-bracket characters.
  		var propertyRe = /\.(WC+)(?:\[(.+)\])?/.source.replace('WC', wordChar)

  		var trackRe = new RegExp('' +
  			'^' +
  			directoryRe +
  			nodeRe +
  			objectRe +
  			propertyRe +
  			'$'
  		)

  		var supportedObjectNames = ['material', 'materials', 'bones']

  		return function parseTrackName (trackName) {
  			var matches = trackRe.exec(trackName)

  			if (!matches) {
  				throw new Error('PropertyBinding: Cannot parse trackName: ' + trackName)
  			}

  			var results = {
  				// directoryName: matches[ 1 ], // (tschw) currently unused
  				nodeName: matches[2],
  				objectName: matches[3],
  				objectIndex: matches[4],
  				propertyName: matches[5], // required
  				propertyIndex: matches[6]
  			}

  			var lastDot = results.nodeName && results.nodeName.lastIndexOf('.')

  			if (lastDot !== undefined && lastDot !== -1) {
  				var objectName = results.nodeName.substring(lastDot + 1)

  				// Object names must be checked against a whitelist. Otherwise, there
  				// is no way to parse 'foo.bar.baz': 'baz' must be a property, but
  				// 'bar' could be the objectName, or part of a nodeName (which can
  				// include '.' characters).
  				if (supportedObjectNames.indexOf(objectName) !== -1) {
  					results.nodeName = results.nodeName.substring(0, lastDot)
  					results.objectName = objectName
  				}
  			}

  			if (results.propertyName === null || results.propertyName.length === 0) {
  				throw new Error('PropertyBinding: can not parse propertyName from trackName: ' + trackName)
  			}

  			return results
  		}
  	}()),

  	findNode: function (root, nodeName) {
  		if (!nodeName || nodeName === '' || nodeName === 'root' || nodeName === '.' || nodeName === -1 || nodeName === root.name || nodeName === root.uuid) {
  			return root
  		}

  		// search into skeleton bones.
  		if (root.skeleton) {
  			var bone = root.skeleton.getBoneByName(nodeName)

  			if (bone !== undefined) {
  				return bone
  			}
  		}

  		// search into node subtree.
  		if (root.children) {
  			var searchNodeSubtree = function (children) {
  				for (var i = 0; i < children.length; i++) {
  					var childNode = children[i]

  					if (childNode.name === nodeName || childNode.uuid === nodeName) {
  						return childNode
  					}

  					var result = searchNodeSubtree(childNode.children)

  					if (result) return result
  				}

  				return null
  			}

  			var subTreeNode = searchNodeSubtree(root.children)

  			if (subTreeNode) {
  				return subTreeNode
  			}
  		}

  		return null
  	}

  })

  Object.assign(PropertyBinding.prototype, { // prototype, continued

  	// these are used to "bind" a nonexistent property
  	_getValue_unavailable: function () {},
  	_setValue_unavailable: function () {},

  	BindingType: {
  		Direct: 0,
  		EntireArray: 1,
  		ArrayElement: 2,
  		HasFromToArray: 3
  	},

  	Versioning: {
  		None: 0,
  		NeedsUpdate: 1,
  		MatrixWorldNeedsUpdate: 2
  	},

  	GetterByBindingType: [

  		function getValue_direct (buffer, offset) {
  			buffer[offset] = this.node[this.propertyName]
  		},

  		function getValue_array (buffer, offset) {
  			var source = this.resolvedProperty

  			for (var i = 0, n = source.length; i !== n; ++i) {
  				buffer[offset++] = source[i]
  			}
  		},

  		function getValue_arrayElement (buffer, offset) {
  			buffer[offset] = this.resolvedProperty[this.propertyIndex]
  		},

  		function getValue_toArray (buffer, offset) {
  			this.resolvedProperty.toArray(buffer, offset)
  		}

  	],

  	SetterByBindingTypeAndVersioning: [

  		[
  			// Direct

  			function setValue_direct (buffer, offset) {
  				this.targetObject[this.propertyName] = buffer[offset]
  			},

  			function setValue_direct_setNeedsUpdate (buffer, offset) {
  				this.targetObject[this.propertyName] = buffer[offset]
  				this.targetObject.needsUpdate = true
  			},

  			function setValue_direct_setMatrixWorldNeedsUpdate (buffer, offset) {
  				this.targetObject[this.propertyName] = buffer[offset]
  				this.targetObject.matrixWorldNeedsUpdate = true
  			}

  		], [

  			// EntireArray

  			function setValue_array (buffer, offset) {
  				var dest = this.resolvedProperty

  				for (var i = 0, n = dest.length; i !== n; ++i) {
  					dest[i] = buffer[offset++]
  				}
  			},

  			function setValue_array_setNeedsUpdate (buffer, offset) {
  				var dest = this.resolvedProperty

  				for (var i = 0, n = dest.length; i !== n; ++i) {
  					dest[i] = buffer[offset++]
  				}

  				this.targetObject.needsUpdate = true
  			},

  			function setValue_array_setMatrixWorldNeedsUpdate (buffer, offset) {
  				var dest = this.resolvedProperty

  				for (var i = 0, n = dest.length; i !== n; ++i) {
  					dest[i] = buffer[offset++]
  				}

  				this.targetObject.matrixWorldNeedsUpdate = true
  			}

  		], [

  			// ArrayElement

  			function setValue_arrayElement (buffer, offset) {
  				this.resolvedProperty[this.propertyIndex] = buffer[offset]
  			},

  			function setValue_arrayElement_setNeedsUpdate (buffer, offset) {
  				this.resolvedProperty[this.propertyIndex] = buffer[offset]
  				this.targetObject.needsUpdate = true
  			},

  			function setValue_arrayElement_setMatrixWorldNeedsUpdate (buffer, offset) {
  				this.resolvedProperty[this.propertyIndex] = buffer[offset]
  				this.targetObject.matrixWorldNeedsUpdate = true
  			}

  		], [

  			// HasToFromArray

  			function setValue_fromArray (buffer, offset) {
  				this.resolvedProperty.fromArray(buffer, offset)
  			},

  			function setValue_fromArray_setNeedsUpdate (buffer, offset) {
  				this.resolvedProperty.fromArray(buffer, offset)
  				this.targetObject.needsUpdate = true
  			},

  			function setValue_fromArray_setMatrixWorldNeedsUpdate (buffer, offset) {
  				this.resolvedProperty.fromArray(buffer, offset)
  				this.targetObject.matrixWorldNeedsUpdate = true
  			}

  		]

  	],

  	getValue: function getValue_unbound (targetArray, offset) {
  		this.bind()
  		this.getValue(targetArray, offset)

  		// Note: This class uses a State pattern on a per-method basis:
  		// 'bind' sets 'this.getValue' / 'setValue' and shadows the
  		// prototype version of these methods with one that represents
  		// the bound state. When the property is not found, the methods
  		// become no-ops.
  	},

  	setValue: function getValue_unbound (sourceArray, offset) {
  		this.bind()
  		this.setValue(sourceArray, offset)
  	},

  	// create getter / setter pair for a property in the scene graph
  	bind: function () {
  		var targetObject = this.node
  			var parsedPath = this.parsedPath

  			var objectName = parsedPath.objectName
  			var propertyName = parsedPath.propertyName
  			var propertyIndex = parsedPath.propertyIndex

  		if (!targetObject) {
  			targetObject = PropertyBinding.findNode(this.rootNode, parsedPath.nodeName) || this.rootNode

  			this.node = targetObject
  		}

  		// set fail state so we can just 'return' on error
  		this.getValue = this._getValue_unavailable
  		this.setValue = this._setValue_unavailable

  		// ensure there is a value node
  		if (!targetObject) {
  			console.error('THREE.PropertyBinding: Trying to update node for track: ' + this.path + ' but it wasn\'t found.')
  			return
  		}

  		if (objectName) {
  			var objectIndex = parsedPath.objectIndex

  			// special cases were we need to reach deeper into the hierarchy to get the face materials....
  			switch (objectName) {
  				case 'materials':

  					if (!targetObject.material) {
  						console.error('THREE.PropertyBinding: Can not bind to material as node does not have a material.', this)
  						return
  					}

  					if (!targetObject.material.materials) {
  						console.error('THREE.PropertyBinding: Can not bind to material.materials as node.material does not have a materials array.', this)
  						return
  					}

  					targetObject = targetObject.material.materials

  					break

  				case 'bones':

  					if (!targetObject.skeleton) {
  						console.error('THREE.PropertyBinding: Can not bind to bones as node does not have a skeleton.', this)
  						return
  					}

  					// potential future optimization: skip this if propertyIndex is already an integer
  					// and convert the integer string to a true integer.

  					targetObject = targetObject.skeleton.bones

  					// support resolving morphTarget names into indices.
  					for (var i = 0; i < targetObject.length; i++) {
  						if (targetObject[i].name === objectIndex) {
  							objectIndex = i
  							break
  						}
  					}

  					break

  				default:

  					if (targetObject[objectName] === undefined) {
  						console.error('THREE.PropertyBinding: Can not bind to objectName of node undefined.', this)
  						return
  					}

  					targetObject = targetObject[objectName]
  			}

  			if (objectIndex !== undefined) {
  				if (targetObject[objectIndex] === undefined) {
  					console.error('THREE.PropertyBinding: Trying to bind to objectIndex of objectName, but is undefined.', this, targetObject)
  					return
  				}

  				targetObject = targetObject[objectIndex]
  			}
  		}

  		// resolve property
  		var nodeProperty = targetObject[propertyName]

  		if (nodeProperty === undefined) {
  			var nodeName = parsedPath.nodeName

  			console.error('THREE.PropertyBinding: Trying to update property for track: ' + nodeName +
  				'.' + propertyName + ' but it wasn\'t found.', targetObject)
  			return
  		}

  		// determine versioning scheme
  		var versioning = this.Versioning.None

  		if (targetObject.needsUpdate !== undefined) { // material
  			versioning = this.Versioning.NeedsUpdate
  			this.targetObject = targetObject
  		} else if (targetObject.matrixWorldNeedsUpdate !== undefined) { // node transform
  			versioning = this.Versioning.MatrixWorldNeedsUpdate
  			this.targetObject = targetObject
  		}

  		// determine how the property gets bound
  		var bindingType = this.BindingType.Direct

  		if (propertyIndex !== undefined) {
  			// access a sub element of the property array (only primitives are supported right now)

  			if (propertyName === 'morphTargetInfluences') {
  				// potential optimization, skip this if propertyIndex is already an integer, and convert the integer string to a true integer.

  				// support resolving morphTarget names into indices.
  				if (!targetObject.geometry) {
  					console.error('THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.', this)
  					return
  				}

  				if (targetObject.geometry.isBufferGeometry) {
  					if (!targetObject.geometry.morphAttributes) {
  						console.error('THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.morphAttributes.', this)
  						return
  					}

  					for (var i = 0; i < this.node.geometry.morphAttributes.position.length; i++) {
  						if (targetObject.geometry.morphAttributes.position[i].name === propertyIndex) {
  							propertyIndex = i
  							break
  						}
  					}
  				} else {
  					if (!targetObject.geometry.morphTargets) {
  						console.error('THREE.PropertyBinding: Can not bind to morphTargetInfluences because node does not have a geometry.morphTargets.', this)
  						return
  					}

  					for (var i = 0; i < this.node.geometry.morphTargets.length; i++) {
  						if (targetObject.geometry.morphTargets[i].name === propertyIndex) {
  							propertyIndex = i
  							break
  						}
  					}
  				}
  			}

  			bindingType = this.BindingType.ArrayElement

  			this.resolvedProperty = nodeProperty
  			this.propertyIndex = propertyIndex
  		} else if (nodeProperty.fromArray !== undefined && nodeProperty.toArray !== undefined) {
  			// must use copy for Object3D.Euler/Quaternion

  			bindingType = this.BindingType.HasFromToArray

  			this.resolvedProperty = nodeProperty
  		} else if (Array.isArray(nodeProperty)) {
  			bindingType = this.BindingType.EntireArray

  			this.resolvedProperty = nodeProperty
  		} else {
  			this.propertyName = propertyName
  		}

  		// select getter / setter
  		this.getValue = this.GetterByBindingType[bindingType]
  		this.setValue = this.SetterByBindingTypeAndVersioning[bindingType][versioning]
  	},

  	unbind: function () {
  		this.node = null

  		// back to the prototype version of getValue / setValue
  		// note: avoiding to mutate the shape of 'this' via 'delete'
  		this.getValue = this._getValue_unbound
  		this.setValue = this._setValue_unbound
  	}

  })

  //! \ DECLARE ALIAS AFTER assign prototype !
  Object.assign(PropertyBinding.prototype, {

  	// initial state of these methods that calls 'bind'
  	_getValue_unbound: PropertyBinding.prototype.getValue,
  	_setValue_unbound: PropertyBinding.prototype.setValue

  })

  /**
   *
   * A group of objects that receives a shared animation state.
   *
   * Usage:
   *
   * 	-	Add objects you would otherwise pass as 'root' to the
   * 		constructor or the .clipAction method of AnimationMixer.
   *
   * 	-	Instead pass this object as 'root'.
   *
   * 	-	You can also add and remove objects later when the mixer
   * 		is running.
   *
   * Note:
   *
   *  	Objects of this class appear as one object to the mixer,
   *  	so cache control of the individual objects must be done
   *  	on the group.
   *
   * Limitation:
   *
   * 	- 	The animated properties must be compatible among the
   * 		all objects in the group.
   *
   *  -	A single property can either be controlled through a
   *  	target group or directly, but not both.
   *
   * @author tschw
   */

  function AnimationObjectGroup () {
  	this.uuid = _Math.generateUUID()

  	// cached objects followed by the active ones
  	this._objects = Array.prototype.slice.call(arguments)

  	this.nCachedObjects_ = 0			// threshold
  	// note: read by PropertyBinding.Composite

  	var indices = {}
  	this._indicesByUUID = indices		// for bookkeeping

  	for (var i = 0, n = arguments.length; i !== n; ++i) {
  		indices[arguments[i].uuid] = i
  	}

  	this._paths = []					// inside: string
  	this._parsedPaths = []				// inside: { we don't care, here }
  	this._bindings = [] 				// inside: Array< PropertyBinding >
  	this._bindingsIndicesByPath = {} 	// inside: indices in these arrays

  	var scope = this

  	this.stats = {

  		objects: {
  			get total () {
  				return scope._objects.length
  			},
  			get inUse () {
  				return this.total - scope.nCachedObjects_
  			}
  		},
  		get bindingsPerObject () {
  			return scope._bindings.length
  		}

  	}
  }

  Object.assign(AnimationObjectGroup.prototype, {

  	isAnimationObjectGroup: true,

  	add: function () {
  		var objects = this._objects
  			var nObjects = objects.length
  			var nCachedObjects = this.nCachedObjects_
  			var indicesByUUID = this._indicesByUUID
  			var paths = this._paths
  			var parsedPaths = this._parsedPaths
  			var bindings = this._bindings
  			var nBindings = bindings.length
  			var knownObject = undefined

  		for (var i = 0, n = arguments.length; i !== n; ++i) {
  			var object = arguments[i]
  				var uuid = object.uuid
  				var index = indicesByUUID[uuid]

  			if (index === undefined) {
  				// unknown object -> add it to the ACTIVE region

  				index = nObjects++
  				indicesByUUID[uuid] = index
  				objects.push(object)

  				// accounting is done, now do the same for all bindings

  				for (var j = 0, m = nBindings; j !== m; ++j) {
  					bindings[j].push(new PropertyBinding(object, paths[j], parsedPaths[j]))
  				}
  			} else if (index < nCachedObjects) {
  				knownObject = objects[index]

  				// move existing object to the ACTIVE region

  				var firstActiveIndex = --nCachedObjects
  					var lastCachedObject = objects[firstActiveIndex]

  				indicesByUUID[lastCachedObject.uuid] = index
  				objects[index] = lastCachedObject

  				indicesByUUID[uuid] = firstActiveIndex
  				objects[firstActiveIndex] = object

  				// accounting is done, now do the same for all bindings

  				for (var j = 0, m = nBindings; j !== m; ++j) {
  					var bindingsForPath = bindings[j]
  						var lastCached = bindingsForPath[firstActiveIndex]
  						var binding = bindingsForPath[index]

  					bindingsForPath[index] = lastCached

  					if (binding === undefined) {
  						// since we do not bother to create new bindings
  						// for objects that are cached, the binding may
  						// or may not exist

  						binding = new PropertyBinding(object, paths[j], parsedPaths[j])
  					}

  					bindingsForPath[firstActiveIndex] = binding
  				}
  			} else if (objects[index] !== knownObject) {
  				console.error('THREE.AnimationObjectGroup: Different objects with the same UUID ' +
  						'detected. Clean the caches or recreate your infrastructure when reloading scenes.')
  			} // else the object is already where we want it to be
  		} // for arguments

  		this.nCachedObjects_ = nCachedObjects
  	},

  	remove: function () {
  		var objects = this._objects
  			var nCachedObjects = this.nCachedObjects_
  			var indicesByUUID = this._indicesByUUID
  			var bindings = this._bindings
  			var nBindings = bindings.length

  		for (var i = 0, n = arguments.length; i !== n; ++i) {
  			var object = arguments[i]
  				var uuid = object.uuid
  				var index = indicesByUUID[uuid]

  			if (index !== undefined && index >= nCachedObjects) {
  				// move existing object into the CACHED region

  				var lastCachedIndex = nCachedObjects++
  					var firstActiveObject = objects[lastCachedIndex]

  				indicesByUUID[firstActiveObject.uuid] = index
  				objects[index] = firstActiveObject

  				indicesByUUID[uuid] = lastCachedIndex
  				objects[lastCachedIndex] = object

  				// accounting is done, now do the same for all bindings

  				for (var j = 0, m = nBindings; j !== m; ++j) {
  					var bindingsForPath = bindings[j]
  						var firstActive = bindingsForPath[lastCachedIndex]
  						var binding = bindingsForPath[index]

  					bindingsForPath[index] = firstActive
  					bindingsForPath[lastCachedIndex] = binding
  				}
  			}
  		} // for arguments

  		this.nCachedObjects_ = nCachedObjects
  	},

  	// remove & forget
  	uncache: function () {
  		var objects = this._objects
  			var nObjects = objects.length
  			var nCachedObjects = this.nCachedObjects_
  			var indicesByUUID = this._indicesByUUID
  			var bindings = this._bindings
  			var nBindings = bindings.length

  		for (var i = 0, n = arguments.length; i !== n; ++i) {
  			var object = arguments[i]
  				var uuid = object.uuid
  				var index = indicesByUUID[uuid]

  			if (index !== undefined) {
  				delete indicesByUUID[uuid]

  				if (index < nCachedObjects) {
  					// object is cached, shrink the CACHED region

  					var firstActiveIndex = --nCachedObjects
  						var lastCachedObject = objects[firstActiveIndex]
  						var lastIndex = --nObjects
  						var lastObject = objects[lastIndex]

  					// last cached object takes this object's place
  					indicesByUUID[lastCachedObject.uuid] = index
  					objects[index] = lastCachedObject

  					// last object goes to the activated slot and pop
  					indicesByUUID[lastObject.uuid] = firstActiveIndex
  					objects[firstActiveIndex] = lastObject
  					objects.pop()

  					// accounting is done, now do the same for all bindings

  					for (var j = 0, m = nBindings; j !== m; ++j) {
  						var bindingsForPath = bindings[j]
  							var lastCached = bindingsForPath[firstActiveIndex]
  							var last = bindingsForPath[lastIndex]

  						bindingsForPath[index] = lastCached
  						bindingsForPath[firstActiveIndex] = last
  						bindingsForPath.pop()
  					}
  				} else {
  					// object is active, just swap with the last and pop

  					var lastIndex = --nObjects
  						var lastObject = objects[lastIndex]

  					indicesByUUID[lastObject.uuid] = index
  					objects[index] = lastObject
  					objects.pop()

  					// accounting is done, now do the same for all bindings

  					for (var j = 0, m = nBindings; j !== m; ++j) {
  						var bindingsForPath = bindings[j]

  						bindingsForPath[index] = bindingsForPath[lastIndex]
  						bindingsForPath.pop()
  					}
  				} // cached or active
  			} // if object is known
  		} // for arguments

  		this.nCachedObjects_ = nCachedObjects
  	},

  	// Internal interface used by befriended PropertyBinding.Composite:

  	subscribe_: function (path, parsedPath) {
  		// returns an array of bindings for the given path that is changed
  		// according to the contained objects in the group

  		var indicesByPath = this._bindingsIndicesByPath
  			var index = indicesByPath[path]
  			var bindings = this._bindings

  		if (index !== undefined) return bindings[index]

  		var paths = this._paths
  			var parsedPaths = this._parsedPaths
  			var objects = this._objects
  			var nObjects = objects.length
  			var nCachedObjects = this.nCachedObjects_
  			var bindingsForPath = new Array(nObjects)

  		index = bindings.length

  		indicesByPath[path] = index

  		paths.push(path)
  		parsedPaths.push(parsedPath)
  		bindings.push(bindingsForPath)

  		for (var i = nCachedObjects, n = objects.length; i !== n; ++i) {
  			var object = objects[i]
  			bindingsForPath[i] = new PropertyBinding(object, path, parsedPath)
  		}

  		return bindingsForPath
  	},

  	unsubscribe_: function (path) {
  		// tells the group to forget about a property path and no longer
  		// update the array previously obtained with 'subscribe_'

  		var indicesByPath = this._bindingsIndicesByPath
  			var index = indicesByPath[path]

  		if (index !== undefined) {
  			var paths = this._paths
  				var parsedPaths = this._parsedPaths
  				var bindings = this._bindings
  				var lastBindingsIndex = bindings.length - 1
  				var lastBindings = bindings[lastBindingsIndex]
  				var lastBindingsPath = path[lastBindingsIndex]

  			indicesByPath[lastBindingsPath] = index

  			bindings[index] = lastBindings
  			bindings.pop()

  			parsedPaths[index] = parsedPaths[lastBindingsIndex]
  			parsedPaths.pop()

  			paths[index] = paths[lastBindingsIndex]
  			paths.pop()
  		}
  	}

  })

  /**
   *
   * Action provided by AnimationMixer for scheduling clip playback on specific
   * objects.
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   *
   */

  function AnimationAction (mixer, clip, localRoot) {
  	this._mixer = mixer
  	this._clip = clip
  	this._localRoot = localRoot || null

  	var tracks = clip.tracks
  		var nTracks = tracks.length
  		var interpolants = new Array(nTracks)

  	var interpolantSettings = {
  		endingStart: ZeroCurvatureEnding,
  		endingEnd: ZeroCurvatureEnding
  	}

  	for (var i = 0; i !== nTracks; ++i) {
  		var interpolant = tracks[i].createInterpolant(null)
  		interpolants[i] = interpolant
  		interpolant.settings = interpolantSettings
  	}

  	this._interpolantSettings = interpolantSettings

  	this._interpolants = interpolants	// bound by the mixer

  	// inside: PropertyMixer (managed by the mixer)
  	this._propertyBindings = new Array(nTracks)

  	this._cacheIndex = null			// for the memory manager
  	this._byClipCacheIndex = null		// for the memory manager

  	this._timeScaleInterpolant = null
  	this._weightInterpolant = null

  	this.loop = LoopRepeat
  	this._loopCount = -1

  	// global mixer time when the action is to be started
  	// it's set back to 'null' upon start of the action
  	this._startTime = null

  	// scaled local time of the action
  	// gets clamped or wrapped to 0..clip.duration according to loop
  	this.time = 0

  	this.timeScale = 1
  	this._effectiveTimeScale = 1

  	this.weight = 1
  	this._effectiveWeight = 1

  	this.repetitions = Infinity 		// no. of repetitions when looping

  	this.paused = false				// true -> zero effective time scale
  	this.enabled = true				// false -> zero effective weight

  	this.clampWhenFinished 	= false	// keep feeding the last frame?

  	this.zeroSlopeAtStart 	= true		// for smooth interpolation w/o separate
  	this.zeroSlopeAtEnd		= true		// clips for start, loop and end
  }

  Object.assign(AnimationAction.prototype, {

  	// State & Scheduling

  	play: function () {
  		this._mixer._activateAction(this)

  		return this
  	},

  	stop: function () {
  		this._mixer._deactivateAction(this)

  		return this.reset()
  	},

  	reset: function () {
  		this.paused = false
  		this.enabled = true

  		this.time = 0			// restart clip
  		this._loopCount = -1	// forget previous loops
  		this._startTime = null	// forget scheduling

  		return this.stopFading().stopWarping()
  	},

  	isRunning: function () {
  		return this.enabled && !this.paused && this.timeScale !== 0 &&
  				this._startTime === null && this._mixer._isActiveAction(this)
  	},

  	// return true when play has been called
  	isScheduled: function () {
  		return this._mixer._isActiveAction(this)
  	},

  	startAt: function (time) {
  		this._startTime = time

  		return this
  	},

  	setLoop: function (mode, repetitions) {
  		this.loop = mode
  		this.repetitions = repetitions

  		return this
  	},

  	// Weight

  	// set the weight stopping any scheduled fading
  	// although .enabled = false yields an effective weight of zero, this
  	// method does *not* change .enabled, because it would be confusing
  	setEffectiveWeight: function (weight) {
  		this.weight = weight

  		// note: same logic as when updated at runtime
  		this._effectiveWeight = this.enabled ? weight : 0

  		return this.stopFading()
  	},

  	// return the weight considering fading and .enabled
  	getEffectiveWeight: function () {
  		return this._effectiveWeight
  	},

  	fadeIn: function (duration) {
  		return this._scheduleFading(duration, 0, 1)
  	},

  	fadeOut: function (duration) {
  		return this._scheduleFading(duration, 1, 0)
  	},

  	crossFadeFrom: function (fadeOutAction, duration, warp) {
  		fadeOutAction.fadeOut(duration)
  		this.fadeIn(duration)

  		if (warp) {
  			var fadeInDuration = this._clip.duration
  				var fadeOutDuration = fadeOutAction._clip.duration

  				var startEndRatio = fadeOutDuration / fadeInDuration
  				var endStartRatio = fadeInDuration / fadeOutDuration

  			fadeOutAction.warp(1.0, startEndRatio, duration)
  			this.warp(endStartRatio, 1.0, duration)
  		}

  		return this
  	},

  	crossFadeTo: function (fadeInAction, duration, warp) {
  		return fadeInAction.crossFadeFrom(this, duration, warp)
  	},

  	stopFading: function () {
  		var weightInterpolant = this._weightInterpolant

  		if (weightInterpolant !== null) {
  			this._weightInterpolant = null
  			this._mixer._takeBackControlInterpolant(weightInterpolant)
  		}

  		return this
  	},

  	// Time Scale Control

  	// set the time scale stopping any scheduled warping
  	// although .paused = true yields an effective time scale of zero, this
  	// method does *not* change .paused, because it would be confusing
  	setEffectiveTimeScale: function (timeScale) {
  		this.timeScale = timeScale
  		this._effectiveTimeScale = this.paused ? 0 : timeScale

  		return this.stopWarping()
  	},

  	// return the time scale considering warping and .paused
  	getEffectiveTimeScale: function () {
  		return this._effectiveTimeScale
  	},

  	setDuration: function (duration) {
  		this.timeScale = this._clip.duration / duration

  		return this.stopWarping()
  	},

  	syncWith: function (action) {
  		this.time = action.time
  		this.timeScale = action.timeScale

  		return this.stopWarping()
  	},

  	halt: function (duration) {
  		return this.warp(this._effectiveTimeScale, 0, duration)
  	},

  	warp: function (startTimeScale, endTimeScale, duration) {
  		var mixer = this._mixer; var now = mixer.time
  			var interpolant = this._timeScaleInterpolant

  			var timeScale = this.timeScale

  		if (interpolant === null) {
  			interpolant = mixer._lendControlInterpolant()
  			this._timeScaleInterpolant = interpolant
  		}

  		var times = interpolant.parameterPositions
  			var values = interpolant.sampleValues

  		times[0] = now
  		times[1] = now + duration

  		values[0] = startTimeScale / timeScale
  		values[1] = endTimeScale / timeScale

  		return this
  	},

  	stopWarping: function () {
  		var timeScaleInterpolant = this._timeScaleInterpolant

  		if (timeScaleInterpolant !== null) {
  			this._timeScaleInterpolant = null
  			this._mixer._takeBackControlInterpolant(timeScaleInterpolant)
  		}

  		return this
  	},

  	// Object Accessors

  	getMixer: function () {
  		return this._mixer
  	},

  	getClip: function () {
  		return this._clip
  	},

  	getRoot: function () {
  		return this._localRoot || this._mixer._root
  	},

  	// Interna

  	_update: function (time, deltaTime, timeDirection, accuIndex) {
  		// called by the mixer

  		if (!this.enabled) {
  			// call ._updateWeight() to update ._effectiveWeight

  			this._updateWeight(time)
  			return
  		}

  		var startTime = this._startTime

  		if (startTime !== null) {
  			// check for scheduled start of action

  			var timeRunning = (time - startTime) * timeDirection
  			if (timeRunning < 0 || timeDirection === 0) {
  				return // yet to come / don't decide when delta = 0
  			}

  			// start

  			this._startTime = null // unschedule
  			deltaTime = timeDirection * timeRunning
  		}

  		// apply time scale and advance time

  		deltaTime *= this._updateTimeScale(time)
  		var clipTime = this._updateTime(deltaTime)

  		// note: _updateTime may disable the action resulting in
  		// an effective weight of 0

  		var weight = this._updateWeight(time)

  		if (weight > 0) {
  			var interpolants = this._interpolants
  			var propertyMixers = this._propertyBindings

  			for (var j = 0, m = interpolants.length; j !== m; ++j) {
  				interpolants[j].evaluate(clipTime)
  				propertyMixers[j].accumulate(accuIndex, weight)
  			}
  		}
  	},

  	_updateWeight: function (time) {
  		var weight = 0

  		if (this.enabled) {
  			weight = this.weight
  			var interpolant = this._weightInterpolant

  			if (interpolant !== null) {
  				var interpolantValue = interpolant.evaluate(time)[0]

  				weight *= interpolantValue

  				if (time > interpolant.parameterPositions[1]) {
  					this.stopFading()

  					if (interpolantValue === 0) {
  						// faded out, disable
  						this.enabled = false
  					}
  				}
  			}
  		}

  		this._effectiveWeight = weight
  		return weight
  	},

  	_updateTimeScale: function (time) {
  		var timeScale = 0

  		if (!this.paused) {
  			timeScale = this.timeScale

  			var interpolant = this._timeScaleInterpolant

  			if (interpolant !== null) {
  				var interpolantValue = interpolant.evaluate(time)[0]

  				timeScale *= interpolantValue

  				if (time > interpolant.parameterPositions[1]) {
  					this.stopWarping()

  					if (timeScale === 0) {
  						// motion has halted, pause
  						this.paused = true
  					} else {
  						// warp done - apply final time scale
  						this.timeScale = timeScale
  					}
  				}
  			}
  		}

  		this._effectiveTimeScale = timeScale
  		return timeScale
  	},

  	_updateTime: function (deltaTime) {
  		var time = this.time + deltaTime

  		if (deltaTime === 0) return time

  		var duration = this._clip.duration

  			var loop = this.loop
  			var loopCount = this._loopCount

  		if (loop === LoopOnce) {
  			if (loopCount === -1) {
  				// just started

  				this._loopCount = 0
  				this._setEndings(true, true, false)
  			}

  			handle_stop: {
  				if (time >= duration) {
  					time = duration
  				} else if (time < 0) {
  					time = 0
  				} else break handle_stop

  				if (this.clampWhenFinished) this.paused = true
  				else this.enabled = false

  				this._mixer.dispatchEvent({
  					type: 'finished',
            action: this,
  					direction: deltaTime < 0 ? -1 : 1
  				})
  			}
  		} else { // repetitive Repeat or PingPong
  			var pingPong = (loop === LoopPingPong)

  			if (loopCount === -1) {
  				// just started

  				if (deltaTime >= 0) {
  					loopCount = 0

  					this._setEndings(true, this.repetitions === 0, pingPong)
  				} else {
  					// when looping in reverse direction, the initial
  					// transition through zero counts as a repetition,
  					// so leave loopCount at -1

  					this._setEndings(this.repetitions === 0, true, pingPong)
  				}
  			}

  			if (time >= duration || time < 0) {
  				// wrap around

  				var loopDelta = Math.floor(time / duration) // signed
  				time -= duration * loopDelta

  				loopCount += Math.abs(loopDelta)

  				var pending = this.repetitions - loopCount

  				if (pending <= 0) {
  					// have to stop (switch state, clamp time, fire event)

  					if (this.clampWhenFinished) this.paused = true
  					else this.enabled = false

  					time = deltaTime > 0 ? duration : 0

  					this._mixer.dispatchEvent({
  						type: 'finished',
              action: this,
  						direction: deltaTime > 0 ? 1 : -1
  					})
  				} else {
  					// keep running

  					if (pending === 1) {
  						// entering the last round

  						var atStart = deltaTime < 0
  						this._setEndings(atStart, !atStart, pingPong)
  					} else {
  						this._setEndings(false, false, pingPong)
  					}

  					this._loopCount = loopCount

  					this._mixer.dispatchEvent({
  						type: 'loop', action: this, loopDelta: loopDelta
  					})
  				}
  			}

  			if (pingPong && (loopCount & 1) === 1) {
  				// invert time for the "pong round"

  				this.time = time
  				return duration - time
  			}
  		}

  		this.time = time
  		return time
  	},

  	_setEndings: function (atStart, atEnd, pingPong) {
  		var settings = this._interpolantSettings

  		if (pingPong) {
  			settings.endingStart 	= ZeroSlopeEnding
  			settings.endingEnd		= ZeroSlopeEnding
  		} else {
  			// assuming for LoopOnce atStart == atEnd == true

  			if (atStart) {
  				settings.endingStart = this.zeroSlopeAtStart ? ZeroSlopeEnding : ZeroCurvatureEnding
  			} else {
  				settings.endingStart = WrapAroundEnding
  			}

  			if (atEnd) {
  				settings.endingEnd = this.zeroSlopeAtEnd ? ZeroSlopeEnding : ZeroCurvatureEnding
  			} else {
  				settings.endingEnd 	 = WrapAroundEnding
  			}
  		}
  	},

  	_scheduleFading: function (duration, weightNow, weightThen) {
  		var mixer = this._mixer; var now = mixer.time
  			var interpolant = this._weightInterpolant

  		if (interpolant === null) {
  			interpolant = mixer._lendControlInterpolant()
  			this._weightInterpolant = interpolant
  		}

  		var times = interpolant.parameterPositions
  			var values = interpolant.sampleValues

  		times[0] = now; 				values[0] = weightNow
  		times[1] = now + duration;	values[1] = weightThen

  		return this
  	}

  })

  /**
   *
   * Player for AnimationClips.
   *
   *
   * @author Ben Houston / http://clara.io/
   * @author David Sarno / http://lighthaus.us/
   * @author tschw
   */

  function AnimationMixer (root) {
  	this._root = root
  	this._initMemoryManager()
  	this._accuIndex = 0

  	this.time = 0

  	this.timeScale = 1.0
  }

  AnimationMixer.prototype = Object.assign(Object.create(EventDispatcher.prototype), {

  	constructor: AnimationMixer,

  	_bindAction: function (action, prototypeAction) {
  		var root = action._localRoot || this._root
  			var tracks = action._clip.tracks
  			var nTracks = tracks.length
  			var bindings = action._propertyBindings
  			var interpolants = action._interpolants
  			var rootUuid = root.uuid
  			var bindingsByRoot = this._bindingsByRootAndName
  			var bindingsByName = bindingsByRoot[rootUuid]

  		if (bindingsByName === undefined) {
  			bindingsByName = {}
  			bindingsByRoot[rootUuid] = bindingsByName
  		}

  		for (var i = 0; i !== nTracks; ++i) {
  			var track = tracks[i]
  				var trackName = track.name
  				var binding = bindingsByName[trackName]

  			if (binding !== undefined) {
  				bindings[i] = binding
  			} else {
  				binding = bindings[i]

  				if (binding !== undefined) {
  					// existing binding, make sure the cache knows

  					if (binding._cacheIndex === null) {
  						++binding.referenceCount
  						this._addInactiveBinding(binding, rootUuid, trackName)
  					}

  					continue
  				}

  				var path = prototypeAction && prototypeAction
  					._propertyBindings[i].binding.parsedPath

  				binding = new PropertyMixer(
  					PropertyBinding.create(root, trackName, path),
  					track.ValueTypeName, track.getValueSize())

  				++binding.referenceCount
  				this._addInactiveBinding(binding, rootUuid, trackName)

  				bindings[i] = binding
  			}

  			interpolants[i].resultBuffer = binding.buffer
  		}
  	},

  	_activateAction: function (action) {
  		if (!this._isActiveAction(action)) {
  			if (action._cacheIndex === null) {
  				// this action has been forgotten by the cache, but the user
  				// appears to be still using it -> rebind

  				var rootUuid = (action._localRoot || this._root).uuid
  					var clipUuid = action._clip.uuid
  					var actionsForClip = this._actionsByClip[clipUuid]

  				this._bindAction(action,
  					actionsForClip && actionsForClip.knownActions[0])

  				this._addInactiveAction(action, clipUuid, rootUuid)
  			}

  			var bindings = action._propertyBindings

  			// increment reference counts / sort out state
  			for (var i = 0, n = bindings.length; i !== n; ++i) {
  				var binding = bindings[i]

  				if (binding.useCount++ === 0) {
  					this._lendBinding(binding)
  					binding.saveOriginalState()
  				}
  			}

  			this._lendAction(action)
  		}
  	},

  	_deactivateAction: function (action) {
  		if (this._isActiveAction(action)) {
  			var bindings = action._propertyBindings

  			// decrement reference counts / sort out state
  			for (var i = 0, n = bindings.length; i !== n; ++i) {
  				var binding = bindings[i]

  				if (--binding.useCount === 0) {
  					binding.restoreOriginalState()
  					this._takeBackBinding(binding)
  				}
  			}

  			this._takeBackAction(action)
  		}
  	},

  	// Memory manager

  	_initMemoryManager: function () {
  		this._actions = [] // 'nActiveActions' followed by inactive ones
  		this._nActiveActions = 0

  		this._actionsByClip = {}
  		// inside:
  		// {
  		// 		knownActions: Array< AnimationAction >	- used as prototypes
  		// 		actionByRoot: AnimationAction			- lookup
  		// }

  		this._bindings = [] // 'nActiveBindings' followed by inactive ones
  		this._nActiveBindings = 0

  		this._bindingsByRootAndName = {} // inside: Map< name, PropertyMixer >

  		this._controlInterpolants = [] // same game as above
  		this._nActiveControlInterpolants = 0

  		var scope = this

  		this.stats = {

  			actions: {
  				get total () {
  					return scope._actions.length
  				},
  				get inUse () {
  					return scope._nActiveActions
  				}
  			},
  			bindings: {
  				get total () {
  					return scope._bindings.length
  				},
  				get inUse () {
  					return scope._nActiveBindings
  				}
  			},
  			controlInterpolants: {
  				get total () {
  					return scope._controlInterpolants.length
  				},
  				get inUse () {
  					return scope._nActiveControlInterpolants
  				}
  			}

  		}
  	},

  	// Memory management for AnimationAction objects

  	_isActiveAction: function (action) {
  		var index = action._cacheIndex
  		return index !== null && index < this._nActiveActions
  	},

  	_addInactiveAction: function (action, clipUuid, rootUuid) {
  		var actions = this._actions
  			var actionsByClip = this._actionsByClip
  			var actionsForClip = actionsByClip[clipUuid]

  		if (actionsForClip === undefined) {
  			actionsForClip = {

  				knownActions: [action],
  				actionByRoot: {}

  			}

  			action._byClipCacheIndex = 0

  			actionsByClip[clipUuid] = actionsForClip
  		} else {
  			var knownActions = actionsForClip.knownActions

  			action._byClipCacheIndex = knownActions.length
  			knownActions.push(action)
  		}

  		action._cacheIndex = actions.length
  		actions.push(action)

  		actionsForClip.actionByRoot[rootUuid] = action
  	},

  	_removeInactiveAction: function (action) {
  		var actions = this._actions
  			var lastInactiveAction = actions[actions.length - 1]
  			var cacheIndex = action._cacheIndex

  		lastInactiveAction._cacheIndex = cacheIndex
  		actions[cacheIndex] = lastInactiveAction
  		actions.pop()

  		action._cacheIndex = null

  		var clipUuid = action._clip.uuid
  			var actionsByClip = this._actionsByClip
  			var actionsForClip = actionsByClip[clipUuid]
  			var knownActionsForClip = actionsForClip.knownActions

  			var lastKnownAction =
  				knownActionsForClip[knownActionsForClip.length - 1]

  			var byClipCacheIndex = action._byClipCacheIndex

  		lastKnownAction._byClipCacheIndex = byClipCacheIndex
  		knownActionsForClip[byClipCacheIndex] = lastKnownAction
  		knownActionsForClip.pop()

  		action._byClipCacheIndex = null

  		var actionByRoot = actionsForClip.actionByRoot
  			var rootUuid = (action._localRoot || this._root).uuid

  		delete actionByRoot[rootUuid]

  		if (knownActionsForClip.length === 0) {
  			delete actionsByClip[clipUuid]
  		}

  		this._removeInactiveBindingsForAction(action)
  	},

  	_removeInactiveBindingsForAction: function (action) {
  		var bindings = action._propertyBindings
  		for (var i = 0, n = bindings.length; i !== n; ++i) {
  			var binding = bindings[i]

  			if (--binding.referenceCount === 0) {
  				this._removeInactiveBinding(binding)
  			}
  		}
  	},

  	_lendAction: function (action) {
  		// [ active actions |  inactive actions  ]
  		// [  active actions >| inactive actions ]
  		//                 s        a
  		//                  <-swap->
  		//                 a        s

  		var actions = this._actions
  			var prevIndex = action._cacheIndex

  			var lastActiveIndex = this._nActiveActions++

  			var firstInactiveAction = actions[lastActiveIndex]

  		action._cacheIndex = lastActiveIndex
  		actions[lastActiveIndex] = action

  		firstInactiveAction._cacheIndex = prevIndex
  		actions[prevIndex] = firstInactiveAction
  	},

  	_takeBackAction: function (action) {
  		// [  active actions  | inactive actions ]
  		// [ active actions |< inactive actions  ]
  		//        a        s
  		//         <-swap->
  		//        s        a

  		var actions = this._actions
  			var prevIndex = action._cacheIndex

  			var firstInactiveIndex = --this._nActiveActions

  			var lastActiveAction = actions[firstInactiveIndex]

  		action._cacheIndex = firstInactiveIndex
  		actions[firstInactiveIndex] = action

  		lastActiveAction._cacheIndex = prevIndex
  		actions[prevIndex] = lastActiveAction
  	},

  	// Memory management for PropertyMixer objects

  	_addInactiveBinding: function (binding, rootUuid, trackName) {
  		var bindingsByRoot = this._bindingsByRootAndName
  			var bindingByName = bindingsByRoot[rootUuid]

  			var bindings = this._bindings

  		if (bindingByName === undefined) {
  			bindingByName = {}
  			bindingsByRoot[rootUuid] = bindingByName
  		}

  		bindingByName[trackName] = binding

  		binding._cacheIndex = bindings.length
  		bindings.push(binding)
  	},

  	_removeInactiveBinding: function (binding) {
  		var bindings = this._bindings
  			var propBinding = binding.binding
  			var rootUuid = propBinding.rootNode.uuid
  			var trackName = propBinding.path
  			var bindingsByRoot = this._bindingsByRootAndName
  			var bindingByName = bindingsByRoot[rootUuid]

  			var lastInactiveBinding = bindings[bindings.length - 1]
  			var cacheIndex = binding._cacheIndex

  		lastInactiveBinding._cacheIndex = cacheIndex
  		bindings[cacheIndex] = lastInactiveBinding
  		bindings.pop()

  		delete bindingByName[trackName]

  		remove_empty_map: {
  			for (var _ in bindingByName) break remove_empty_map // eslint-disable-line no-unused-vars

  			delete bindingsByRoot[rootUuid]
  		}
  	},

  	_lendBinding: function (binding) {
  		var bindings = this._bindings
  			var prevIndex = binding._cacheIndex

  			var lastActiveIndex = this._nActiveBindings++

  			var firstInactiveBinding = bindings[lastActiveIndex]

  		binding._cacheIndex = lastActiveIndex
  		bindings[lastActiveIndex] = binding

  		firstInactiveBinding._cacheIndex = prevIndex
  		bindings[prevIndex] = firstInactiveBinding
  	},

  	_takeBackBinding: function (binding) {
  		var bindings = this._bindings
  			var prevIndex = binding._cacheIndex

  			var firstInactiveIndex = --this._nActiveBindings

  			var lastActiveBinding = bindings[firstInactiveIndex]

  		binding._cacheIndex = firstInactiveIndex
  		bindings[firstInactiveIndex] = binding

  		lastActiveBinding._cacheIndex = prevIndex
  		bindings[prevIndex] = lastActiveBinding
  	},

  	// Memory management of Interpolants for weight and time scale

  	_lendControlInterpolant: function () {
  		var interpolants = this._controlInterpolants
  			var lastActiveIndex = this._nActiveControlInterpolants++
  			var interpolant = interpolants[lastActiveIndex]

  		if (interpolant === undefined) {
  			interpolant = new LinearInterpolant(
  				new Float32Array(2), new Float32Array(2),
  				1, this._controlInterpolantsResultBuffer)

  			interpolant.__cacheIndex = lastActiveIndex
  			interpolants[lastActiveIndex] = interpolant
  		}

  		return interpolant
  	},

  	_takeBackControlInterpolant: function (interpolant) {
  		var interpolants = this._controlInterpolants
  			var prevIndex = interpolant.__cacheIndex

  			var firstInactiveIndex = --this._nActiveControlInterpolants

  			var lastActiveInterpolant = interpolants[firstInactiveIndex]

  		interpolant.__cacheIndex = firstInactiveIndex
  		interpolants[firstInactiveIndex] = interpolant

  		lastActiveInterpolant.__cacheIndex = prevIndex
  		interpolants[prevIndex] = lastActiveInterpolant
  	},

  	_controlInterpolantsResultBuffer: new Float32Array(1),

  	// return an action for a clip optionally using a custom root target
  	// object (this method allocates a lot of dynamic memory in case a
  	// previously unknown clip/root combination is specified)
  	clipAction: function (clip, optionalRoot) {
  		var root = optionalRoot || this._root
  			var rootUuid = root.uuid

  			var clipObject = typeof clip === 'string'
  				? AnimationClip.findByName(root, clip) : clip

  			var clipUuid = clipObject !== null ? clipObject.uuid : clip

  			var actionsForClip = this._actionsByClip[clipUuid]
  			var prototypeAction = null

  		if (actionsForClip !== undefined) {
  			var existingAction =
  					actionsForClip.actionByRoot[rootUuid]

  			if (existingAction !== undefined) {
  				return existingAction
  			}

  			// we know the clip, so we don't have to parse all
  			// the bindings again but can just copy
  			prototypeAction = actionsForClip.knownActions[0]

  			// also, take the clip from the prototype action
  			if (clipObject === null) { clipObject = prototypeAction._clip }
  		}

  		// clip must be known when specified via string
  		if (clipObject === null) return null

  		// allocate all resources required to run it
  		var newAction = new AnimationAction(this, clipObject, optionalRoot)

  		this._bindAction(newAction, prototypeAction)

  		// and make the action known to the memory manager
  		this._addInactiveAction(newAction, clipUuid, rootUuid)

  		return newAction
  	},

  	// get an existing action
  	existingAction: function (clip, optionalRoot) {
  		var root = optionalRoot || this._root
  			var rootUuid = root.uuid

  			var clipObject = typeof clip === 'string'
  				? AnimationClip.findByName(root, clip) : clip

  			var clipUuid = clipObject ? clipObject.uuid : clip

  			var actionsForClip = this._actionsByClip[clipUuid]

  		if (actionsForClip !== undefined) {
  			return actionsForClip.actionByRoot[rootUuid] || null
  		}

  		return null
  	},

  	// deactivates all previously scheduled actions
  	stopAllAction: function () {
  		var actions = this._actions
  			var nActions = this._nActiveActions
  			var bindings = this._bindings
  			var nBindings = this._nActiveBindings

  		this._nActiveActions = 0
  		this._nActiveBindings = 0

  		for (var i = 0; i !== nActions; ++i) {
  			actions[i].reset()
  		}

  		for (var i = 0; i !== nBindings; ++i) {
  			bindings[i].useCount = 0
  		}

  		return this
  	},

  	// advance the time and update apply the animation
  	update: function (deltaTime) {
  		deltaTime *= this.timeScale

  		var actions = this._actions
  			var nActions = this._nActiveActions

  			var time = this.time += deltaTime
  			var timeDirection = Math.sign(deltaTime)

  			var accuIndex = this._accuIndex ^= 1

  		// run active actions

  		for (var i = 0; i !== nActions; ++i) {
  			var action = actions[i]

  			action._update(time, deltaTime, timeDirection, accuIndex)
  		}

  		// update scene graph

  		var bindings = this._bindings
  			var nBindings = this._nActiveBindings

  		for (var i = 0; i !== nBindings; ++i) {
  			bindings[i].apply(accuIndex)
  		}

  		return this
  	},

  	// return this mixer's root target object
  	getRoot: function () {
  		return this._root
  	},

  	// free all resources specific to a particular clip
  	uncacheClip: function (clip) {
  		var actions = this._actions
  			var clipUuid = clip.uuid
  			var actionsByClip = this._actionsByClip
  			var actionsForClip = actionsByClip[clipUuid]

  		if (actionsForClip !== undefined) {
  			// note: just calling _removeInactiveAction would mess up the
  			// iteration state and also require updating the state we can
  			// just throw away

  			var actionsToRemove = actionsForClip.knownActions

  			for (var i = 0, n = actionsToRemove.length; i !== n; ++i) {
  				var action = actionsToRemove[i]

  				this._deactivateAction(action)

  				var cacheIndex = action._cacheIndex
  					var lastInactiveAction = actions[actions.length - 1]

  				action._cacheIndex = null
  				action._byClipCacheIndex = null

  				lastInactiveAction._cacheIndex = cacheIndex
  				actions[cacheIndex] = lastInactiveAction
  				actions.pop()

  				this._removeInactiveBindingsForAction(action)
  			}

  			delete actionsByClip[clipUuid]
  		}
  	},

  	// free all resources specific to a particular root target object
  	uncacheRoot: function (root) {
  		var rootUuid = root.uuid
  			var actionsByClip = this._actionsByClip

  		for (var clipUuid in actionsByClip) {
  			var actionByRoot = actionsByClip[clipUuid].actionByRoot
  				var action = actionByRoot[rootUuid]

  			if (action !== undefined) {
  				this._deactivateAction(action)
  				this._removeInactiveAction(action)
  			}
  		}

  		var bindingsByRoot = this._bindingsByRootAndName
  			var bindingByName = bindingsByRoot[rootUuid]

  		if (bindingByName !== undefined) {
  			for (var trackName in bindingByName) {
  				var binding = bindingByName[trackName]
  				binding.restoreOriginalState()
  				this._removeInactiveBinding(binding)
  			}
  		}
  	},

  	// remove a targeted clip from the cache
  	uncacheAction: function (clip, optionalRoot) {
  		var action = this.existingAction(clip, optionalRoot)

  		if (action !== null) {
  			this._deactivateAction(action)
  			this._removeInactiveAction(action)
  		}
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function Uniform (value) {
  	if (typeof value === 'string') {
  		console.warn('THREE.Uniform: Type parameter is no longer needed.')
  		value = arguments[1]
  	}

  	this.value = value
  }

  Uniform.prototype.clone = function () {
  	return new Uniform(this.value.clone === undefined ? this.value : this.value.clone())
  }

  /**
   * @author benaadams / https://twitter.com/ben_a_adams
   */

  function InstancedBufferGeometry () {
  	BufferGeometry.call(this)

  	this.type = 'InstancedBufferGeometry'
  	this.maxInstancedCount = undefined
  }

  InstancedBufferGeometry.prototype = Object.assign(Object.create(BufferGeometry.prototype), {

  	constructor: InstancedBufferGeometry,

  	isInstancedBufferGeometry: true,

  	copy: function (source) {
  		BufferGeometry.prototype.copy.call(this, source)

  		this.maxInstancedCount = source.maxInstancedCount

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	}

  })

  /**
   * @author benaadams / https://twitter.com/ben_a_adams
   */

  function InterleavedBufferAttribute (interleavedBuffer, itemSize, offset, normalized) {
  	this.data = interleavedBuffer
  	this.itemSize = itemSize
  	this.offset = offset

  	this.normalized = normalized === true
  }

  Object.defineProperties(InterleavedBufferAttribute.prototype, {

  	count: {

  		get: function () {
  			return this.data.count
  		}

  	},

  	array: {

  		get: function () {
  			return this.data.array
  		}

  	}

  })

  Object.assign(InterleavedBufferAttribute.prototype, {

  	isInterleavedBufferAttribute: true,

  	setX: function (index, x) {
  		this.data.array[index * this.data.stride + this.offset] = x

  		return this
  	},

  	setY: function (index, y) {
  		this.data.array[index * this.data.stride + this.offset + 1] = y

  		return this
  	},

  	setZ: function (index, z) {
  		this.data.array[index * this.data.stride + this.offset + 2] = z

  		return this
  	},

  	setW: function (index, w) {
  		this.data.array[index * this.data.stride + this.offset + 3] = w

  		return this
  	},

  	getX: function (index) {
  		return this.data.array[index * this.data.stride + this.offset]
  	},

  	getY: function (index) {
  		return this.data.array[index * this.data.stride + this.offset + 1]
  	},

  	getZ: function (index) {
  		return this.data.array[index * this.data.stride + this.offset + 2]
  	},

  	getW: function (index) {
  		return this.data.array[index * this.data.stride + this.offset + 3]
  	},

  	setXY: function (index, x, y) {
  		index = index * this.data.stride + this.offset

  		this.data.array[index + 0] = x
  		this.data.array[index + 1] = y

  		return this
  	},

  	setXYZ: function (index, x, y, z) {
  		index = index * this.data.stride + this.offset

  		this.data.array[index + 0] = x
  		this.data.array[index + 1] = y
  		this.data.array[index + 2] = z

  		return this
  	},

  	setXYZW: function (index, x, y, z, w) {
  		index = index * this.data.stride + this.offset

  		this.data.array[index + 0] = x
  		this.data.array[index + 1] = y
  		this.data.array[index + 2] = z
  		this.data.array[index + 3] = w

  		return this
  	}

  })

  /**
   * @author benaadams / https://twitter.com/ben_a_adams
   */

  function InterleavedBuffer (array, stride) {
  	this.array = array
  	this.stride = stride
  	this.count = array !== undefined ? array.length / stride : 0

  	this.dynamic = false
  	this.updateRange = { offset: 0, count: -1 }

  	this.version = 0
  }

  Object.defineProperty(InterleavedBuffer.prototype, 'needsUpdate', {

  	set: function (value) {
  		if (value === true) this.version++
  	}

  })

  Object.assign(InterleavedBuffer.prototype, {

  	isInterleavedBuffer: true,

  	onUploadCallback: function () {},

  	setArray: function (array) {
  		if (Array.isArray(array)) {
  			throw new TypeError('THREE.BufferAttribute: array should be a Typed Array.')
  		}

  		this.count = array !== undefined ? array.length / this.stride : 0
  		this.array = array

  		return this
  	},

  	setDynamic: function (value) {
  		this.dynamic = value

  		return this
  	},

  	copy: function (source) {
  		this.array = new source.array.constructor(source.array)
  		this.count = source.count
  		this.stride = source.stride
  		this.dynamic = source.dynamic

  		return this
  	},

  	copyAt: function (index1, attribute, index2) {
  		index1 *= this.stride
  		index2 *= attribute.stride

  		for (var i = 0, l = this.stride; i < l; i++) {
  			this.array[index1 + i] = attribute.array[index2 + i]
  		}

  		return this
  	},

  	set: function (value, offset) {
  		if (offset === undefined) offset = 0

  		this.array.set(value, offset)

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	onUpload: function (callback) {
  		this.onUploadCallback = callback

  		return this
  	}

  })

  /**
   * @author benaadams / https://twitter.com/ben_a_adams
   */

  function InstancedInterleavedBuffer (array, stride, meshPerAttribute) {
  	InterleavedBuffer.call(this, array, stride)

  	this.meshPerAttribute = meshPerAttribute || 1
  }

  InstancedInterleavedBuffer.prototype = Object.assign(Object.create(InterleavedBuffer.prototype), {

  	constructor: InstancedInterleavedBuffer,

  	isInstancedInterleavedBuffer: true,

  	copy: function (source) {
  		InterleavedBuffer.prototype.copy.call(this, source)

  		this.meshPerAttribute = source.meshPerAttribute

  		return this
  	}

  })

  /**
   * @author benaadams / https://twitter.com/ben_a_adams
   */

  function InstancedBufferAttribute (array, itemSize, meshPerAttribute) {
  	BufferAttribute.call(this, array, itemSize)

  	this.meshPerAttribute = meshPerAttribute || 1
  }

  InstancedBufferAttribute.prototype = Object.assign(Object.create(BufferAttribute.prototype), {

  	constructor: InstancedBufferAttribute,

  	isInstancedBufferAttribute: true,

  	copy: function (source) {
  		BufferAttribute.prototype.copy.call(this, source)

  		this.meshPerAttribute = source.meshPerAttribute

  		return this
  	}

  })

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author bhouston / http://clara.io/
   * @author stephomi / http://stephaneginier.com/
   */

  function Raycaster (origin, direction, near, far) {
  	this.ray = new Ray(origin, direction)
  	// direction is assumed to be normalized (for accurate distance calculations)

  	this.near = near || 0
  	this.far = far || Infinity

  	this.params = {
  		Mesh: {},
  		Line: {},
  		LOD: {},
  		Points: { threshold: 1 },
  		Sprite: {}
  	}

  	Object.defineProperties(this.params, {
  		PointCloud: {
  			get: function () {
  				console.warn('THREE.Raycaster: params.PointCloud has been renamed to params.Points.')
  				return this.Points
  			}
  		}
  	})
  }

  function ascSort (a, b) {
  	return a.distance - b.distance
  }

  function intersectObject (object, raycaster, intersects, recursive) {
  	if (object.visible === false) return

  	object.raycast(raycaster, intersects)

  	if (recursive === true) {
  		var children = object.children

  		for (var i = 0, l = children.length; i < l; i++) {
  			intersectObject(children[i], raycaster, intersects, true)
  		}
  	}
  }

  Object.assign(Raycaster.prototype, {

  	linePrecision: 1,

  	set: function (origin, direction) {
  		// direction is assumed to be normalized (for accurate distance calculations)

  		this.ray.set(origin, direction)
  	},

  	setFromCamera: function (coords, camera) {
  		if ((camera && camera.isPerspectiveCamera)) {
  			this.ray.origin.setFromMatrixPosition(camera.matrixWorld)
  			this.ray.direction.set(coords.x, coords.y, 0.5).unproject(camera).sub(this.ray.origin).normalize()
  		} else if ((camera && camera.isOrthographicCamera)) {
  			this.ray.origin.set(coords.x, coords.y, (camera.near + camera.far) / (camera.near - camera.far)).unproject(camera) // set origin in plane of camera
  			this.ray.direction.set(0, 0, -1).transformDirection(camera.matrixWorld)
  		} else {
  			console.error('THREE.Raycaster: Unsupported camera type.')
  		}
  	},

  	intersectObject: function (object, recursive, optionalTarget) {
  		var intersects = optionalTarget || []

  		intersectObject(object, this, intersects, recursive)

  		intersects.sort(ascSort)

  		return intersects
  	},

  	intersectObjects: function (objects, recursive, optionalTarget) {
  		var intersects = optionalTarget || []

  		if (Array.isArray(objects) === false) {
  			console.warn('THREE.Raycaster.intersectObjects: objects is not an Array.')
  			return intersects
  		}

  		for (var i = 0, l = objects.length; i < l; i++) {
  			intersectObject(objects[i], this, intersects, recursive)
  		}

  		intersects.sort(ascSort)

  		return intersects
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com/
   */

  function Clock (autoStart) {
  	this.autoStart = (autoStart !== undefined) ? autoStart : true

  	this.startTime = 0
  	this.oldTime = 0
  	this.elapsedTime = 0

  	this.running = false
  }

  Object.assign(Clock.prototype, {

  	start: function () {
  		this.startTime = (typeof performance === 'undefined' ? Date : performance).now() // see #10732

  		this.oldTime = this.startTime
  		this.elapsedTime = 0
  		this.running = true
  	},

  	stop: function () {
  		this.getElapsedTime()
  		this.running = false
  		this.autoStart = false
  	},

  	getElapsedTime: function () {
  		this.getDelta()
  		return this.elapsedTime
  	},

  	getDelta: function () {
  		var diff = 0

  		if (this.autoStart && !this.running) {
  			this.start()
  			return 0
  		}

  		if (this.running) {
  			var newTime = (typeof performance === 'undefined' ? Date : performance).now()

  			diff = (newTime - this.oldTime) / 1000
  			this.oldTime = newTime

  			this.elapsedTime += diff
  		}

  		return diff
  	}

  })

  /**
   * @author bhouston / http://clara.io
   * @author WestLangley / http://github.com/WestLangley
   *
   * Ref: https://en.wikipedia.org/wiki/Spherical_coordinate_system
   *
   * The poles (phi) are at the positive and negative y axis.
   * The equator starts at positive z.
   */

  function Spherical (radius, phi, theta) {
  	this.radius = (radius !== undefined) ? radius : 1.0
  	this.phi = (phi !== undefined) ? phi : 0 // up / down towards top and bottom pole
  	this.theta = (theta !== undefined) ? theta : 0 // around the equator of the sphere

  	return this
  }

  Object.assign(Spherical.prototype, {

  	set: function (radius, phi, theta) {
  		this.radius = radius
  		this.phi = phi
  		this.theta = theta

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (other) {
  		this.radius = other.radius
  		this.phi = other.phi
  		this.theta = other.theta

  		return this
  	},

  	// restrict phi to be betwee EPS and PI-EPS
  	makeSafe: function () {
  		var EPS = 0.000001
  		this.phi = Math.max(EPS, Math.min(Math.PI - EPS, this.phi))

  		return this
  	},

  	setFromVector3: function (vec3) {
  		this.radius = vec3.length()

  		if (this.radius === 0) {
  			this.theta = 0
  			this.phi = 0
  		} else {
  			this.theta = Math.atan2(vec3.x, vec3.z) // equator angle around y-up axis
  			this.phi = Math.acos(_Math.clamp(vec3.y / this.radius, -1, 1)) // polar angle
  		}

  		return this
  	}

  })

  /**
   * @author Mugen87 / https://github.com/Mugen87
   *
   * Ref: https://en.wikipedia.org/wiki/Cylindrical_coordinate_system
   *
   */

  function Cylindrical (radius, theta, y) {
  	this.radius = (radius !== undefined) ? radius : 1.0 // distance from the origin to a point in the x-z plane
  	this.theta = (theta !== undefined) ? theta : 0 // counterclockwise angle in the x-z plane measured in radians from the positive z-axis
  	this.y = (y !== undefined) ? y : 0 // height above the x-z plane

  	return this
  }

  Object.assign(Cylindrical.prototype, {

  	set: function (radius, theta, y) {
  		this.radius = radius
  		this.theta = theta
  		this.y = y

  		return this
  	},

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (other) {
  		this.radius = other.radius
  		this.theta = other.theta
  		this.y = other.y

  		return this
  	},

  	setFromVector3: function (vec3) {
  		this.radius = Math.sqrt(vec3.x * vec3.x + vec3.z * vec3.z)
  		this.theta = Math.atan2(vec3.x, vec3.z)
  		this.y = vec3.y

  		return this
  	}

  })

  /**
   * @author bhouston / http://clara.io
   */

  function Box2 (min, max) {
  	this.min = (min !== undefined) ? min : new Vector2(+Infinity, +Infinity)
  	this.max = (max !== undefined) ? max : new Vector2(-Infinity, -Infinity)
  }

  Object.assign(Box2.prototype, {

  	set: function (min, max) {
  		this.min.copy(min)
  		this.max.copy(max)

  		return this
  	},

  	setFromPoints: function (points) {
  		this.makeEmpty()

  		for (var i = 0, il = points.length; i < il; i++) {
  			this.expandByPoint(points[i])
  		}

  		return this
  	},

  	setFromCenterAndSize: (function () {
  		var v1 = new Vector2()

  		return function setFromCenterAndSize (center, size) {
  			var halfSize = v1.copy(size).multiplyScalar(0.5)
  			this.min.copy(center).sub(halfSize)
  			this.max.copy(center).add(halfSize)

  			return this
  		}
  	}()),

  	clone: function () {
  		return new this.constructor().copy(this)
  	},

  	copy: function (box) {
  		this.min.copy(box.min)
  		this.max.copy(box.max)

  		return this
  	},

  	makeEmpty: function () {
  		this.min.x = this.min.y = +Infinity
  		this.max.x = this.max.y = -Infinity

  		return this
  	},

  	isEmpty: function () {
  		// this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes

  		return (this.max.x < this.min.x) || (this.max.y < this.min.y)
  	},

  	getCenter: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Box2: .getCenter() target is now required')
  			target = new Vector2()
  		}

  		return this.isEmpty() ? target.set(0, 0) : target.addVectors(this.min, this.max).multiplyScalar(0.5)
  	},

  	getSize: function (target) {
  		if (target === undefined) {
  			console.warn('THREE.Box2: .getSize() target is now required')
  			target = new Vector2()
  		}

  		return this.isEmpty() ? target.set(0, 0) : target.subVectors(this.max, this.min)
  	},

  	expandByPoint: function (point) {
  		this.min.min(point)
  		this.max.max(point)

  		return this
  	},

  	expandByVector: function (vector) {
  		this.min.sub(vector)
  		this.max.add(vector)

  		return this
  	},

  	expandByScalar: function (scalar) {
  		this.min.addScalar(-scalar)
  		this.max.addScalar(scalar)

  		return this
  	},

  	containsPoint: function (point) {
  		return !(point.x < this.min.x || point.x > this.max.x ||
  			point.y < this.min.y || point.y > this.max.y)
  	},

  	containsBox: function (box) {
  		return this.min.x <= box.min.x && box.max.x <= this.max.x &&
  			this.min.y <= box.min.y && box.max.y <= this.max.y
  	},

  	getParameter: function (point, target) {
  		// This can potentially have a divide by zero if the box
  		// has a size dimension of 0.

  		if (target === undefined) {
  			console.warn('THREE.Box2: .getParameter() target is now required')
  			target = new Vector2()
  		}

  		return target.set(
  			(point.x - this.min.x) / (this.max.x - this.min.x),
  			(point.y - this.min.y) / (this.max.y - this.min.y)
  		)
  	},

  	intersectsBox: function (box) {
  		// using 4 splitting planes to rule out intersections

  		return !(box.max.x < this.min.x || box.min.x > this.max.x ||
  			box.max.y < this.min.y || box.min.y > this.max.y)
  	},

  	clampPoint: function (point, target) {
  		if (target === undefined) {
  			console.warn('THREE.Box2: .clampPoint() target is now required')
  			target = new Vector2()
  		}

  		return target.copy(point).clamp(this.min, this.max)
  	},

  	distanceToPoint: (function () {
  		var v1 = new Vector2()

  		return function distanceToPoint (point) {
  			var clampedPoint = v1.copy(point).clamp(this.min, this.max)
  			return clampedPoint.sub(point).length()
  		}
  	}()),

  	intersect: function (box) {
  		this.min.max(box.min)
  		this.max.min(box.max)

  		return this
  	},

  	union: function (box) {
  		this.min.min(box.min)
  		this.max.max(box.max)

  		return this
  	},

  	translate: function (offset) {
  		this.min.add(offset)
  		this.max.add(offset)

  		return this
  	},

  	equals: function (box) {
  		return box.min.equals(this.min) && box.max.equals(this.max)
  	}

  })

  /**
   * @author alteredq / http://alteredqualia.com/
   */

  function ImmediateRenderObject (material) {
  	Object3D.call(this)

  	this.material = material
  	this.render = function (/* renderCallback */) {}
  }

  ImmediateRenderObject.prototype = Object.create(Object3D.prototype)
  ImmediateRenderObject.prototype.constructor = ImmediateRenderObject

  ImmediateRenderObject.prototype.isImmediateRenderObject = true

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author WestLangley / http://github.com/WestLangley
   */

  function VertexNormalsHelper (object, size, hex, linewidth) {
  	this.object = object

  	this.size = (size !== undefined) ? size : 1

  	var color = (hex !== undefined) ? hex : 0xff0000

  	var width = (linewidth !== undefined) ? linewidth : 1

  	//

  	var nNormals = 0

  	var objGeometry = this.object.geometry

  	if (objGeometry && objGeometry.isGeometry) {
  		nNormals = objGeometry.faces.length * 3
  	} else if (objGeometry && objGeometry.isBufferGeometry) {
  		nNormals = objGeometry.attributes.normal.count
  	}

  	//

  	var geometry = new BufferGeometry()

  	var positions = new Float32BufferAttribute(nNormals * 2 * 3, 3)

  	geometry.addAttribute('position', positions)

  	LineSegments.call(this, geometry, new LineBasicMaterial({ color: color, linewidth: width }))

  	//

  	this.matrixAutoUpdate = false

  	this.update()
  }

  VertexNormalsHelper.prototype = Object.create(LineSegments.prototype)
  VertexNormalsHelper.prototype.constructor = VertexNormalsHelper

  VertexNormalsHelper.prototype.update = (function () {
  	var v1 = new Vector3()
  	var v2 = new Vector3()
  	var normalMatrix = new Matrix3()

  	return function update () {
  		var keys = ['a', 'b', 'c']

  		this.object.updateMatrixWorld(true)

  		normalMatrix.getNormalMatrix(this.object.matrixWorld)

  		var matrixWorld = this.object.matrixWorld

  		var position = this.geometry.attributes.position

  		//

  		var objGeometry = this.object.geometry

  		if (objGeometry && objGeometry.isGeometry) {
  			var vertices = objGeometry.vertices

  			var faces = objGeometry.faces

  			var idx = 0

  			for (var i = 0, l = faces.length; i < l; i++) {
  				var face = faces[i]

  				for (var j = 0, jl = face.vertexNormals.length; j < jl; j++) {
  					var vertex = vertices[face[keys[j]]]

  					var normal = face.vertexNormals[j]

  					v1.copy(vertex).applyMatrix4(matrixWorld)

  					v2.copy(normal).applyMatrix3(normalMatrix).normalize().multiplyScalar(this.size).add(v1)

  					position.setXYZ(idx, v1.x, v1.y, v1.z)

  					idx = idx + 1

  					position.setXYZ(idx, v2.x, v2.y, v2.z)

  					idx = idx + 1
  				}
  			}
  		} else if (objGeometry && objGeometry.isBufferGeometry) {
  			var objPos = objGeometry.attributes.position

  			var objNorm = objGeometry.attributes.normal

  			var idx = 0

  			// for simplicity, ignore index and drawcalls, and render every normal

  			for (var j = 0, jl = objPos.count; j < jl; j++) {
  				v1.set(objPos.getX(j), objPos.getY(j), objPos.getZ(j)).applyMatrix4(matrixWorld)

  				v2.set(objNorm.getX(j), objNorm.getY(j), objNorm.getZ(j))

  				v2.applyMatrix3(normalMatrix).normalize().multiplyScalar(this.size).add(v1)

  				position.setXYZ(idx, v1.x, v1.y, v1.z)

  				idx = idx + 1

  				position.setXYZ(idx, v2.x, v2.y, v2.z)

  				idx = idx + 1
  			}
  		}

  		position.needsUpdate = true
  	}
  }())

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   * @author WestLangley / http://github.com/WestLangley
   */

  function SpotLightHelper (light, color) {
  	Object3D.call(this)

  	this.light = light
  	this.light.updateMatrixWorld()

  	this.matrix = light.matrixWorld
  	this.matrixAutoUpdate = false

  	this.color = color

  	var geometry = new BufferGeometry()

  	var positions = [
  		0, 0, 0, 	0, 0, 1,
  		0, 0, 0, 	1, 0, 1,
  		0, 0, 0,	-1, 0, 1,
  		0, 0, 0, 	0, 1, 1,
  		0, 0, 0, 	0, -1, 1
  	]

  	for (var i = 0, j = 1, l = 32; i < l; i++, j++) {
  		var p1 = (i / l) * Math.PI * 2
  		var p2 = (j / l) * Math.PI * 2

  		positions.push(
  			Math.cos(p1), Math.sin(p1), 1,
  			Math.cos(p2), Math.sin(p2), 1
  		)
  	}

  	geometry.addAttribute('position', new Float32BufferAttribute(positions, 3))

  	var material = new LineBasicMaterial({ fog: false })

  	this.cone = new LineSegments(geometry, material)
  	this.add(this.cone)

  	this.update()
  }

  SpotLightHelper.prototype = Object.create(Object3D.prototype)
  SpotLightHelper.prototype.constructor = SpotLightHelper

  SpotLightHelper.prototype.dispose = function () {
  	this.cone.geometry.dispose()
  	this.cone.material.dispose()
  }

  SpotLightHelper.prototype.update = (function () {
  	var vector = new Vector3()
  	var vector2 = new Vector3()

  	return function update () {
  		this.light.updateMatrixWorld()

  		var coneLength = this.light.distance ? this.light.distance : 1000
  		var coneWidth = coneLength * Math.tan(this.light.angle)

  		this.cone.scale.set(coneWidth, coneWidth, coneLength)

  		vector.setFromMatrixPosition(this.light.matrixWorld)
  		vector2.setFromMatrixPosition(this.light.target.matrixWorld)

  		this.cone.lookAt(vector2.sub(vector))

  		if (this.color !== undefined) {
  			this.cone.material.color.set(this.color)
  		} else {
  			this.cone.material.color.copy(this.light.color)
  		}
  	}
  }())

  /**
   * @author Sean Griffin / http://twitter.com/sgrif
   * @author Michael Guerrero / http://realitymeltdown.com
   * @author mrdoob / http://mrdoob.com/
   * @author ikerr / http://verold.com
   * @author Mugen87 / https://github.com/Mugen87
   */

  function getBoneList (object) {
  	var boneList = []

  	if (object && object.isBone) {
  		boneList.push(object)
  	}

  	for (var i = 0; i < object.children.length; i++) {
  		boneList.push.apply(boneList, getBoneList(object.children[i]))
  	}

  	return boneList
  }

  function SkeletonHelper (object) {
  	var bones = getBoneList(object)

  	var geometry = new BufferGeometry()

  	var vertices = []
  	var colors = []

  	var color1 = new Color(0, 0, 1)
  	var color2 = new Color(0, 1, 0)

  	for (var i = 0; i < bones.length; i++) {
  		var bone = bones[i]

  		if (bone.parent && bone.parent.isBone) {
  			vertices.push(0, 0, 0)
  			vertices.push(0, 0, 0)
  			colors.push(color1.r, color1.g, color1.b)
  			colors.push(color2.r, color2.g, color2.b)
  		}
  	}

  	geometry.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	geometry.addAttribute('color', new Float32BufferAttribute(colors, 3))

  	var material = new LineBasicMaterial({ vertexColors: VertexColors, depthTest: false, depthWrite: false, transparent: true })

  	LineSegments.call(this, geometry, material)

  	this.root = object
  	this.bones = bones

  	this.matrix = object.matrixWorld
  	this.matrixAutoUpdate = false
  }

  SkeletonHelper.prototype = Object.create(LineSegments.prototype)
  SkeletonHelper.prototype.constructor = SkeletonHelper

  SkeletonHelper.prototype.updateMatrixWorld = (function () {
  	var vector = new Vector3()

  	var boneMatrix = new Matrix4()
  	var matrixWorldInv = new Matrix4()

  	return function updateMatrixWorld (force) {
  		var bones = this.bones

  		var geometry = this.geometry
  		var position = geometry.getAttribute('position')

  		matrixWorldInv.getInverse(this.root.matrixWorld)

  		for (var i = 0, j = 0; i < bones.length; i++) {
  			var bone = bones[i]

  			if (bone.parent && bone.parent.isBone) {
  				boneMatrix.multiplyMatrices(matrixWorldInv, bone.matrixWorld)
  				vector.setFromMatrixPosition(boneMatrix)
  				position.setXYZ(j, vector.x, vector.y, vector.z)

  				boneMatrix.multiplyMatrices(matrixWorldInv, bone.parent.matrixWorld)
  				vector.setFromMatrixPosition(boneMatrix)
  				position.setXYZ(j + 1, vector.x, vector.y, vector.z)

  				j += 2
  			}
  		}

  		geometry.getAttribute('position').needsUpdate = true

  		Object3D.prototype.updateMatrixWorld.call(this, force)
  	}
  }())

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   */

  function PointLightHelper (light, sphereSize, color) {
  	this.light = light
  	this.light.updateMatrixWorld()

  	this.color = color

  	var geometry = new SphereBufferGeometry(sphereSize, 4, 2)
  	var material = new MeshBasicMaterial({ wireframe: true, fog: false })

  	Mesh.call(this, geometry, material)

  	this.matrix = this.light.matrixWorld
  	this.matrixAutoUpdate = false

  	this.update()

  	/*
  	var distanceGeometry = new THREE.IcosahedronGeometry( 1, 2 );
  	var distanceMaterial = new THREE.MeshBasicMaterial( { color: hexColor, fog: false, wireframe: true, opacity: 0.1, transparent: true } );

  	this.lightSphere = new THREE.Mesh( bulbGeometry, bulbMaterial );
  	this.lightDistance = new THREE.Mesh( distanceGeometry, distanceMaterial );

  	var d = light.distance;

  	if ( d === 0.0 ) {

  		this.lightDistance.visible = false;

  	} else {

  		this.lightDistance.scale.set( d, d, d );

  	}

  	this.add( this.lightDistance );
  	*/
  }

  PointLightHelper.prototype = Object.create(Mesh.prototype)
  PointLightHelper.prototype.constructor = PointLightHelper

  PointLightHelper.prototype.dispose = function () {
  	this.geometry.dispose()
  	this.material.dispose()
  }

  PointLightHelper.prototype.update = function () {
  	if (this.color !== undefined) {
  		this.material.color.set(this.color)
  	} else {
  		this.material.color.copy(this.light.color)
  	}

  	/*
  	var d = this.light.distance;

  	if ( d === 0.0 ) {

  		this.lightDistance.visible = false;

  	} else {

  		this.lightDistance.visible = true;
  		this.lightDistance.scale.set( d, d, d );

  	}
  	*/
  }

  /**
   * @author abelnation / http://github.com/abelnation
   * @author Mugen87 / http://github.com/Mugen87
   * @author WestLangley / http://github.com/WestLangley
   */

  function RectAreaLightHelper (light, color) {
  	Object3D.call(this)

  	this.light = light
  	this.light.updateMatrixWorld()

  	this.matrix = light.matrixWorld
  	this.matrixAutoUpdate = false

  	this.color = color

  	var material = new LineBasicMaterial({ fog: false })

  	var geometry = new BufferGeometry()

  	geometry.addAttribute('position', new BufferAttribute(new Float32Array(5 * 3), 3))

  	this.line = new Line(geometry, material)
  	this.add(this.line)

  	this.update()
  }

  RectAreaLightHelper.prototype = Object.create(Object3D.prototype)
  RectAreaLightHelper.prototype.constructor = RectAreaLightHelper

  RectAreaLightHelper.prototype.dispose = function () {
  	this.children[0].geometry.dispose()
  	this.children[0].material.dispose()
  }

  RectAreaLightHelper.prototype.update = function () {
  	// calculate new dimensions of the helper

  	var hx = this.light.width * 0.5
  	var hy = this.light.height * 0.5

  	var position = this.line.geometry.attributes.position
  	var array = position.array

  	// update vertices

  	array[0] = hx; array[1] = -hy; array[2] = 0
  	array[3] = hx; array[4] = hy; array[5] = 0
  	array[6] = -hx; array[7] = hy; array[8] = 0
  	array[9] = -hx; array[10] = -hy; array[11] = 0
  	array[12] = hx; array[13] = -hy; array[14] = 0

  	position.needsUpdate = true

  	if (this.color !== undefined) {
  		this.line.material.color.set(this.color)
  	} else {
  		this.line.material.color.copy(this.light.color)
  	}
  }

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   * @author Mugen87 / https://github.com/Mugen87
   */

  function HemisphereLightHelper (light, size, color) {
  	Object3D.call(this)

  	this.light = light
  	this.light.updateMatrixWorld()

  	this.matrix = light.matrixWorld
  	this.matrixAutoUpdate = false

  	this.color = color

  	var geometry = new OctahedronBufferGeometry(size)
  	geometry.rotateY(Math.PI * 0.5)

  	this.material = new MeshBasicMaterial({ wireframe: true, fog: false })
  	if (this.color === undefined) this.material.vertexColors = VertexColors

  	var position = geometry.getAttribute('position')
  	var colors = new Float32Array(position.count * 3)

  	geometry.addAttribute('color', new BufferAttribute(colors, 3))

  	this.add(new Mesh(geometry, this.material))

  	this.update()
  }

  HemisphereLightHelper.prototype = Object.create(Object3D.prototype)
  HemisphereLightHelper.prototype.constructor = HemisphereLightHelper

  HemisphereLightHelper.prototype.dispose = function () {
  	this.children[0].geometry.dispose()
  	this.children[0].material.dispose()
  }

  HemisphereLightHelper.prototype.update = (function () {
  	var vector = new Vector3()

  	var color1 = new Color()
  	var color2 = new Color()

  	return function update () {
  		var mesh = this.children[0]

  		if (this.color !== undefined) {
  			this.material.color.set(this.color)
  		} else {
  			var colors = mesh.geometry.getAttribute('color')

  			color1.copy(this.light.color)
  			color2.copy(this.light.groundColor)

  			for (var i = 0, l = colors.count; i < l; i++) {
  				var color = (i < (l / 2)) ? color1 : color2

  				colors.setXYZ(i, color.r, color.g, color.b)
  			}

  			colors.needsUpdate = true
  		}

  		mesh.lookAt(vector.setFromMatrixPosition(this.light.matrixWorld).negate())
  	}
  }())

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function GridHelper (size, divisions, color1, color2) {
  	size = size || 10
  	divisions = divisions || 10
  	color1 = new Color(color1 !== undefined ? color1 : 0x444444)
  	color2 = new Color(color2 !== undefined ? color2 : 0x888888)

  	var center = divisions / 2
  	var step = size / divisions
  	var halfSize = size / 2

  	var vertices = []; var colors = []

  	for (var i = 0, j = 0, k = -halfSize; i <= divisions; i++, k += step) {
  		vertices.push(-halfSize, 0, k, halfSize, 0, k)
  		vertices.push(k, 0, -halfSize, k, 0, halfSize)

  		var color = i === center ? color1 : color2

  		color.toArray(colors, j); j += 3
  		color.toArray(colors, j); j += 3
  		color.toArray(colors, j); j += 3
  		color.toArray(colors, j); j += 3
  	}

  	var geometry = new BufferGeometry()
  	geometry.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	geometry.addAttribute('color', new Float32BufferAttribute(colors, 3))

  	var material = new LineBasicMaterial({ vertexColors: VertexColors })

  	LineSegments.call(this, geometry, material)
  }

  GridHelper.prototype = Object.create(LineSegments.prototype)
  GridHelper.prototype.constructor = GridHelper

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author Mugen87 / http://github.com/Mugen87
   * @author Hectate / http://www.github.com/Hectate
   */

  function PolarGridHelper (radius, radials, circles, divisions, color1, color2) {
  	radius = radius || 10
  	radials = radials || 16
  	circles = circles || 8
  	divisions = divisions || 64
  	color1 = new Color(color1 !== undefined ? color1 : 0x444444)
  	color2 = new Color(color2 !== undefined ? color2 : 0x888888)

  	var vertices = []
  	var colors = []

  	var x, z
  	var v, i, j, r, color

  	// create the radials

  	for (i = 0; i <= radials; i++) {
  		v = (i / radials) * (Math.PI * 2)

  		x = Math.sin(v) * radius
  		z = Math.cos(v) * radius

  		vertices.push(0, 0, 0)
  		vertices.push(x, 0, z)

  		color = (i & 1) ? color1 : color2

  		colors.push(color.r, color.g, color.b)
  		colors.push(color.r, color.g, color.b)
  	}

  	// create the circles

  	for (i = 0; i <= circles; i++) {
  		color = (i & 1) ? color1 : color2

  		r = radius - (radius / circles * i)

  		for (j = 0; j < divisions; j++) {
  			// first vertex

  			v = (j / divisions) * (Math.PI * 2)

  			x = Math.sin(v) * r
  			z = Math.cos(v) * r

  			vertices.push(x, 0, z)
  			colors.push(color.r, color.g, color.b)

  			// second vertex

  			v = ((j + 1) / divisions) * (Math.PI * 2)

  			x = Math.sin(v) * r
  			z = Math.cos(v) * r

  			vertices.push(x, 0, z)
  			colors.push(color.r, color.g, color.b)
  		}
  	}

  	var geometry = new BufferGeometry()
  	geometry.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	geometry.addAttribute('color', new Float32BufferAttribute(colors, 3))

  	var material = new LineBasicMaterial({ vertexColors: VertexColors })

  	LineSegments.call(this, geometry, material)
  }

  PolarGridHelper.prototype = Object.create(LineSegments.prototype)
  PolarGridHelper.prototype.constructor = PolarGridHelper

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author WestLangley / http://github.com/WestLangley
   */

  function FaceNormalsHelper (object, size, hex, linewidth) {
  	// FaceNormalsHelper only supports THREE.Geometry

  	this.object = object

  	this.size = (size !== undefined) ? size : 1

  	var color = (hex !== undefined) ? hex : 0xffff00

  	var width = (linewidth !== undefined) ? linewidth : 1

  	//

  	var nNormals = 0

  	var objGeometry = this.object.geometry

  	if (objGeometry && objGeometry.isGeometry) {
  		nNormals = objGeometry.faces.length
  	} else {
  		console.warn('THREE.FaceNormalsHelper: only THREE.Geometry is supported. Use THREE.VertexNormalsHelper, instead.')
  	}

  	//

  	var geometry = new BufferGeometry()

  	var positions = new Float32BufferAttribute(nNormals * 2 * 3, 3)

  	geometry.addAttribute('position', positions)

  	LineSegments.call(this, geometry, new LineBasicMaterial({ color: color, linewidth: width }))

  	//

  	this.matrixAutoUpdate = false
  	this.update()
  }

  FaceNormalsHelper.prototype = Object.create(LineSegments.prototype)
  FaceNormalsHelper.prototype.constructor = FaceNormalsHelper

  FaceNormalsHelper.prototype.update = (function () {
  	var v1 = new Vector3()
  	var v2 = new Vector3()
  	var normalMatrix = new Matrix3()

  	return function update () {
  		this.object.updateMatrixWorld(true)

  		normalMatrix.getNormalMatrix(this.object.matrixWorld)

  		var matrixWorld = this.object.matrixWorld

  		var position = this.geometry.attributes.position

  		//

  		var objGeometry = this.object.geometry

  		var vertices = objGeometry.vertices

  		var faces = objGeometry.faces

  		var idx = 0

  		for (var i = 0, l = faces.length; i < l; i++) {
  			var face = faces[i]

  			var normal = face.normal

  			v1.copy(vertices[face.a])
  				.add(vertices[face.b])
  				.add(vertices[face.c])
  				.divideScalar(3)
  				.applyMatrix4(matrixWorld)

  			v2.copy(normal).applyMatrix3(normalMatrix).normalize().multiplyScalar(this.size).add(v1)

  			position.setXYZ(idx, v1.x, v1.y, v1.z)

  			idx = idx + 1

  			position.setXYZ(idx, v2.x, v2.y, v2.z)

  			idx = idx + 1
  		}

  		position.needsUpdate = true
  	}
  }())

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   * @author WestLangley / http://github.com/WestLangley
   */

  function DirectionalLightHelper (light, size, color) {
  	Object3D.call(this)

  	this.light = light
  	this.light.updateMatrixWorld()

  	this.matrix = light.matrixWorld
  	this.matrixAutoUpdate = false

  	this.color = color

  	if (size === undefined) size = 1

  	var geometry = new BufferGeometry()
  	geometry.addAttribute('position', new Float32BufferAttribute([
  		-size, size, 0,
  		size, size, 0,
  		size, -size, 0,
  		-size, -size, 0,
  		-size, size, 0
  	], 3))

  	var material = new LineBasicMaterial({ fog: false })

  	this.lightPlane = new Line(geometry, material)
  	this.add(this.lightPlane)

  	geometry = new BufferGeometry()
  	geometry.addAttribute('position', new Float32BufferAttribute([0, 0, 0, 0, 0, 1], 3))

  	this.targetLine = new Line(geometry, material)
  	this.add(this.targetLine)

  	this.update()
  }

  DirectionalLightHelper.prototype = Object.create(Object3D.prototype)
  DirectionalLightHelper.prototype.constructor = DirectionalLightHelper

  DirectionalLightHelper.prototype.dispose = function () {
  	this.lightPlane.geometry.dispose()
  	this.lightPlane.material.dispose()
  	this.targetLine.geometry.dispose()
  	this.targetLine.material.dispose()
  }

  DirectionalLightHelper.prototype.update = (function () {
  	var v1 = new Vector3()
  	var v2 = new Vector3()
  	var v3 = new Vector3()

  	return function update () {
  		v1.setFromMatrixPosition(this.light.matrixWorld)
  		v2.setFromMatrixPosition(this.light.target.matrixWorld)
  		v3.subVectors(v2, v1)

  		this.lightPlane.lookAt(v3)

  		if (this.color !== undefined) {
  			this.lightPlane.material.color.set(this.color)
  			this.targetLine.material.color.set(this.color)
  		} else {
  			this.lightPlane.material.color.copy(this.light.color)
  			this.targetLine.material.color.copy(this.light.color)
  		}

  		this.targetLine.lookAt(v3)
  		this.targetLine.scale.z = v3.length()
  	}
  }())

  /**
   * @author alteredq / http://alteredqualia.com/
   * @author Mugen87 / https://github.com/Mugen87
   *
   *	- shows frustum, line of sight and up of the camera
   *	- suitable for fast updates
   * 	- based on frustum visualization in lightgl.js shadowmap example
   *		http://evanw.github.com/lightgl.js/tests/shadowmap.html
   */

  function CameraHelper (camera) {
  	var geometry = new BufferGeometry()
  	var material = new LineBasicMaterial({ color: 0xffffff, vertexColors: FaceColors })

  	var vertices = []
  	var colors = []

  	var pointMap = {}

  	// colors

  	var colorFrustum = new Color(0xffaa00)
  	var colorCone = new Color(0xff0000)
  	var colorUp = new Color(0x00aaff)
  	var colorTarget = new Color(0xffffff)
  	var colorCross = new Color(0x333333)

  	// near

  	addLine('n1', 'n2', colorFrustum)
  	addLine('n2', 'n4', colorFrustum)
  	addLine('n4', 'n3', colorFrustum)
  	addLine('n3', 'n1', colorFrustum)

  	// far

  	addLine('f1', 'f2', colorFrustum)
  	addLine('f2', 'f4', colorFrustum)
  	addLine('f4', 'f3', colorFrustum)
  	addLine('f3', 'f1', colorFrustum)

  	// sides

  	addLine('n1', 'f1', colorFrustum)
  	addLine('n2', 'f2', colorFrustum)
  	addLine('n3', 'f3', colorFrustum)
  	addLine('n4', 'f4', colorFrustum)

  	// cone

  	addLine('p', 'n1', colorCone)
  	addLine('p', 'n2', colorCone)
  	addLine('p', 'n3', colorCone)
  	addLine('p', 'n4', colorCone)

  	// up

  	addLine('u1', 'u2', colorUp)
  	addLine('u2', 'u3', colorUp)
  	addLine('u3', 'u1', colorUp)

  	// target

  	addLine('c', 't', colorTarget)
  	addLine('p', 'c', colorCross)

  	// cross

  	addLine('cn1', 'cn2', colorCross)
  	addLine('cn3', 'cn4', colorCross)

  	addLine('cf1', 'cf2', colorCross)
  	addLine('cf3', 'cf4', colorCross)

  	function addLine (a, b, color) {
  		addPoint(a, color)
  		addPoint(b, color)
  	}

  	function addPoint (id, color) {
  		vertices.push(0, 0, 0)
  		colors.push(color.r, color.g, color.b)

  		if (pointMap[id] === undefined) {
  			pointMap[id] = []
  		}

  		pointMap[id].push((vertices.length / 3) - 1)
  	}

  	geometry.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	geometry.addAttribute('color', new Float32BufferAttribute(colors, 3))

  	LineSegments.call(this, geometry, material)

  	this.camera = camera
  	if (this.camera.updateProjectionMatrix) this.camera.updateProjectionMatrix()

  	this.matrix = camera.matrixWorld
  	this.matrixAutoUpdate = false

  	this.pointMap = pointMap

  	this.update()
  }

  CameraHelper.prototype = Object.create(LineSegments.prototype)
  CameraHelper.prototype.constructor = CameraHelper

  CameraHelper.prototype.update = (function () {
  	var geometry, pointMap

  	var vector = new Vector3()
  	var camera = new Camera()

  	function setPoint (point, x, y, z) {
  		vector.set(x, y, z).unproject(camera)

  		var points = pointMap[point]

  		if (points !== undefined) {
  			var position = geometry.getAttribute('position')

  			for (var i = 0, l = points.length; i < l; i++) {
  				position.setXYZ(points[i], vector.x, vector.y, vector.z)
  			}
  		}
  	}

  	return function update () {
  		geometry = this.geometry
  		pointMap = this.pointMap

  		var w = 1; var h = 1

  		// we need just camera projection matrix
  		// world matrix must be identity

  		camera.projectionMatrix.copy(this.camera.projectionMatrix)

  		// center / target

  		setPoint('c', 0, 0, -1)
  		setPoint('t', 0, 0, 1)

  		// near

  		setPoint('n1', -w, -h, -1)
  		setPoint('n2', w, -h, -1)
  		setPoint('n3', -w, h, -1)
  		setPoint('n4', w, h, -1)

  		// far

  		setPoint('f1', -w, -h, 1)
  		setPoint('f2', w, -h, 1)
  		setPoint('f3', -w, h, 1)
  		setPoint('f4', w, h, 1)

  		// up

  		setPoint('u1', w * 0.7, h * 1.1, -1)
  		setPoint('u2', -w * 0.7, h * 1.1, -1)
  		setPoint('u3', 0, h * 2, -1)

  		// cross

  		setPoint('cf1', -w, 0, 1)
  		setPoint('cf2', w, 0, 1)
  		setPoint('cf3', 0, -h, 1)
  		setPoint('cf4', 0, h, 1)

  		setPoint('cn1', -w, 0, -1)
  		setPoint('cn2', w, 0, -1)
  		setPoint('cn3', 0, -h, -1)
  		setPoint('cn4', 0, h, -1)

  		geometry.getAttribute('position').needsUpdate = true
  	}
  }())

  /**
   * @author mrdoob / http://mrdoob.com/
   * @author Mugen87 / http://github.com/Mugen87
   */

  function BoxHelper (object, color) {
  	this.object = object

  	if (color === undefined) color = 0xffff00

  	var indices = new Uint16Array([0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7])
  	var positions = new Float32Array(8 * 3)

  	var geometry = new BufferGeometry()
  	geometry.setIndex(new BufferAttribute(indices, 1))
  	geometry.addAttribute('position', new BufferAttribute(positions, 3))

  	LineSegments.call(this, geometry, new LineBasicMaterial({ color: color }))

  	this.matrixAutoUpdate = false

  	this.update()
  }

  BoxHelper.prototype = Object.create(LineSegments.prototype)
  BoxHelper.prototype.constructor = BoxHelper

  BoxHelper.prototype.update = (function () {
  	var box = new Box3()

  	return function update (object) {
  		if (object !== undefined) {
  			console.warn('THREE.BoxHelper: .update() has no longer arguments.')
  		}

  		if (this.object !== undefined) {
  			box.setFromObject(this.object)
  		}

  		if (box.isEmpty()) return

  		var min = box.min
  		var max = box.max

  		/*
  		  5____4
  		1/___0/|
  		| 6__|_7
  		2/___3/

  		0: max.x, max.y, max.z
  		1: min.x, max.y, max.z
  		2: min.x, min.y, max.z
  		3: max.x, min.y, max.z
  		4: max.x, max.y, min.z
  		5: min.x, max.y, min.z
  		6: min.x, min.y, min.z
  		7: max.x, min.y, min.z
  		*/

  		var position = this.geometry.attributes.position
  		var array = position.array

  		array[0] = max.x; array[1] = max.y; array[2] = max.z
  		array[3] = min.x; array[4] = max.y; array[5] = max.z
  		array[6] = min.x; array[7] = min.y; array[8] = max.z
  		array[9] = max.x; array[10] = min.y; array[11] = max.z
  		array[12] = max.x; array[13] = max.y; array[14] = min.z
  		array[15] = min.x; array[16] = max.y; array[17] = min.z
  		array[18] = min.x; array[19] = min.y; array[20] = min.z
  		array[21] = max.x; array[22] = min.y; array[23] = min.z

  		position.needsUpdate = true

  		this.geometry.computeBoundingSphere()
  	}
  })()

  BoxHelper.prototype.setFromObject = function (object) {
  	this.object = object
  	this.update()

  	return this
  }

  /**
   * @author WestLangley / http://github.com/WestLangley
   */

  function Box3Helper (box, hex) {
  	this.type = 'Box3Helper'

  	this.box = box

  	var color = (hex !== undefined) ? hex : 0xffff00

  	var indices = new Uint16Array([0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7])

  	var positions = [1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1]

  	var geometry = new BufferGeometry()

  	geometry.setIndex(new BufferAttribute(indices, 1))

  	geometry.addAttribute('position', new Float32BufferAttribute(positions, 3))

  	LineSegments.call(this, geometry, new LineBasicMaterial({ color: color }))

  	this.geometry.computeBoundingSphere()
  }

  Box3Helper.prototype = Object.create(LineSegments.prototype)
  Box3Helper.prototype.constructor = Box3Helper

  Box3Helper.prototype.updateMatrixWorld = function (force) {
  	var box = this.box

  	if (box.isEmpty()) return

  	box.getCenter(this.position)

  	box.getSize(this.scale)

  	this.scale.multiplyScalar(0.5)

  	Object3D.prototype.updateMatrixWorld.call(this, force)
  }

  /**
   * @author WestLangley / http://github.com/WestLangley
   */

  function PlaneHelper (plane, size, hex) {
  	this.type = 'PlaneHelper'

  	this.plane = plane

  	this.size = (size === undefined) ? 1 : size

  	var color = (hex !== undefined) ? hex : 0xffff00

  	var positions = [1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0]

  	var geometry = new BufferGeometry()
  	geometry.addAttribute('position', new Float32BufferAttribute(positions, 3))
  	geometry.computeBoundingSphere()

  	Line.call(this, geometry, new LineBasicMaterial({ color: color }))

  	//

  	var positions2 = [1, 1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1]

  	var geometry2 = new BufferGeometry()
  	geometry2.addAttribute('position', new Float32BufferAttribute(positions2, 3))
  	geometry2.computeBoundingSphere()

  	this.add(new Mesh(geometry2, new MeshBasicMaterial({ color: color, opacity: 0.2, transparent: true, depthWrite: false })))
  }

  PlaneHelper.prototype = Object.create(Line.prototype)
  PlaneHelper.prototype.constructor = PlaneHelper

  PlaneHelper.prototype.updateMatrixWorld = function (force) {
  	var scale = -this.plane.constant

  	if (Math.abs(scale) < 1e-8) scale = 1e-8 // sign does not matter

  	this.scale.set(0.5 * this.size, 0.5 * this.size, scale)

  	this.children[0].material.side = (scale < 0) ? BackSide : FrontSide // renderer flips side when determinant < 0; flipping not wanted here

  	this.lookAt(this.plane.normal)

  	Object3D.prototype.updateMatrixWorld.call(this, force)
  }

  /**
   * @author WestLangley / http://github.com/WestLangley
   * @author zz85 / http://github.com/zz85
   * @author bhouston / http://clara.io
   *
   * Creates an arrow for visualizing directions
   *
   * Parameters:
   *  dir - Vector3
   *  origin - Vector3
   *  length - Number
   *  color - color in hex value
   *  headLength - Number
   *  headWidth - Number
   */

  var lineGeometry, coneGeometry

  function ArrowHelper (dir, origin, length, color, headLength, headWidth) {
  	// dir is assumed to be normalized

  	Object3D.call(this)

  	if (color === undefined) color = 0xffff00
  	if (length === undefined) length = 1
  	if (headLength === undefined) headLength = 0.2 * length
  	if (headWidth === undefined) headWidth = 0.2 * headLength

  	if (lineGeometry === undefined) {
  		lineGeometry = new BufferGeometry()
  		lineGeometry.addAttribute('position', new Float32BufferAttribute([0, 0, 0, 0, 1, 0], 3))

  		coneGeometry = new CylinderBufferGeometry(0, 0.5, 1, 5, 1)
  		coneGeometry.translate(0, -0.5, 0)
  	}

  	this.position.copy(origin)

  	this.line = new Line(lineGeometry, new LineBasicMaterial({ color: color }))
  	this.line.matrixAutoUpdate = false
  	this.add(this.line)

  	this.cone = new Mesh(coneGeometry, new MeshBasicMaterial({ color: color }))
  	this.cone.matrixAutoUpdate = false
  	this.add(this.cone)

  	this.setDirection(dir)
  	this.setLength(length, headLength, headWidth)
  }

  ArrowHelper.prototype = Object.create(Object3D.prototype)
  ArrowHelper.prototype.constructor = ArrowHelper

  ArrowHelper.prototype.setDirection = (function () {
  	var axis = new Vector3()
  	var radians

  	return function setDirection (dir) {
  		// dir is assumed to be normalized

  		if (dir.y > 0.99999) {
  			this.quaternion.set(0, 0, 0, 1)
  		} else if (dir.y < -0.99999) {
  			this.quaternion.set(1, 0, 0, 0)
  		} else {
  			axis.set(dir.z, 0, -dir.x).normalize()

  			radians = Math.acos(dir.y)

  			this.quaternion.setFromAxisAngle(axis, radians)
  		}
  	}
  }())

  ArrowHelper.prototype.setLength = function (length, headLength, headWidth) {
  	if (headLength === undefined) headLength = 0.2 * length
  	if (headWidth === undefined) headWidth = 0.2 * headLength

  	this.line.scale.set(1, Math.max(0, length - headLength), 1)
  	this.line.updateMatrix()

  	this.cone.scale.set(headWidth, headLength, headWidth)
  	this.cone.position.y = length
  	this.cone.updateMatrix()
  }

  ArrowHelper.prototype.setColor = function (color) {
  	this.line.material.color.copy(color)
  	this.cone.material.color.copy(color)
  }

  /**
   * @author sroucheray / http://sroucheray.org/
   * @author mrdoob / http://mrdoob.com/
   */

  function AxesHelper (size) {
  	size = size || 1

  	var vertices = [
  		0, 0, 0,	size, 0, 0,
  		0, 0, 0,	0, size, 0,
  		0, 0, 0,	0, 0, size
  	]

  	var colors = [
  		1, 0, 0,	1, 0.6, 0,
  		0, 1, 0,	0.6, 1, 0,
  		0, 0, 1,	0, 0.6, 1
  	]

  	var geometry = new BufferGeometry()
  	geometry.addAttribute('position', new Float32BufferAttribute(vertices, 3))
  	geometry.addAttribute('color', new Float32BufferAttribute(colors, 3))

  	var material = new LineBasicMaterial({ vertexColors: VertexColors })

  	LineSegments.call(this, geometry, material)
  }

  AxesHelper.prototype = Object.create(LineSegments.prototype)
  AxesHelper.prototype.constructor = AxesHelper

  //

  Curve.create = function (construct, getPoint) {
  	console.log('THREE.Curve.create() has been deprecated')

  	construct.prototype = Object.create(Curve.prototype)
  	construct.prototype.constructor = construct
  	construct.prototype.getPoint = getPoint

  	return construct
  }

  //

  Object.assign(CurvePath.prototype, {

  	createPointsGeometry: function (divisions) {
  		console.warn('THREE.CurvePath: .createPointsGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.')

  		// generate geometry from path points (for Line or Points objects)

  		var pts = this.getPoints(divisions)
  		return this.createGeometry(pts)
  	},

  	createSpacedPointsGeometry: function (divisions) {
  		console.warn('THREE.CurvePath: .createSpacedPointsGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.')

  		// generate geometry from equidistant sampling along the path

  		var pts = this.getSpacedPoints(divisions)
  		return this.createGeometry(pts)
  	},

  	createGeometry: function (points) {
  		console.warn('THREE.CurvePath: .createGeometry() has been removed. Use new THREE.Geometry().setFromPoints( points ) instead.')

  		var geometry = new Geometry()

  		for (var i = 0, l = points.length; i < l; i++) {
  			var point = points[i]
  			geometry.vertices.push(new Vector3(point.x, point.y, point.z || 0))
  		}

  		return geometry
  	}

  })

  //

  Object.assign(Path.prototype, {

  	fromPoints: function (points) {
  		console.warn('THREE.Path: .fromPoints() has been renamed to .setFromPoints().')
  		this.setFromPoints(points)
  	}

  })

  //

  function Spline (points) {
  	console.warn('THREE.Spline has been removed. Use THREE.CatmullRomCurve3 instead.')

  	CatmullRomCurve3.call(this, points)
  	this.type = 'catmullrom'
  }

  Spline.prototype = Object.create(CatmullRomCurve3.prototype)

  Object.assign(Spline.prototype, {

  	initFromArray: function (/* a */) {
  		console.error('THREE.Spline: .initFromArray() has been removed.')
  	},
  	getControlPointsArray: function (/* optionalTarget */) {
  		console.error('THREE.Spline: .getControlPointsArray() has been removed.')
  	},
  	reparametrizeByArcLength: function (/* samplingCoef */) {
  		console.error('THREE.Spline: .reparametrizeByArcLength() has been removed.')
  	}

  })

  GridHelper.prototype.setColors = function () {
  	console.error('THREE.GridHelper: setColors() has been deprecated, pass them in the constructor instead.')
  }

  SkeletonHelper.prototype.update = function () {
  	console.error('THREE.SkeletonHelper: update() no longer needs to be called.')
  }

  //

  Object.assign(Loader.prototype, {

  	extractUrlBase: function (url) {
  		console.warn('THREE.Loader: .extractUrlBase() has been deprecated. Use THREE.LoaderUtils.extractUrlBase() instead.')
  		return LoaderUtils.extractUrlBase(url)
  	}

  })

  //

  Object.assign(Box2.prototype, {

  	center: function (optionalTarget) {
  		console.warn('THREE.Box2: .center() has been renamed to .getCenter().')
  		return this.getCenter(optionalTarget)
  	},
  	empty: function () {
  		console.warn('THREE.Box2: .empty() has been renamed to .isEmpty().')
  		return this.isEmpty()
  	},
  	isIntersectionBox: function (box) {
  		console.warn('THREE.Box2: .isIntersectionBox() has been renamed to .intersectsBox().')
  		return this.intersectsBox(box)
  	},
  	size: function (optionalTarget) {
  		console.warn('THREE.Box2: .size() has been renamed to .getSize().')
  		return this.getSize(optionalTarget)
  	}
  })

  Object.assign(Box3.prototype, {

  	center: function (optionalTarget) {
  		console.warn('THREE.Box3: .center() has been renamed to .getCenter().')
  		return this.getCenter(optionalTarget)
  	},
  	empty: function () {
  		console.warn('THREE.Box3: .empty() has been renamed to .isEmpty().')
  		return this.isEmpty()
  	},
  	isIntersectionBox: function (box) {
  		console.warn('THREE.Box3: .isIntersectionBox() has been renamed to .intersectsBox().')
  		return this.intersectsBox(box)
  	},
  	isIntersectionSphere: function (sphere) {
  		console.warn('THREE.Box3: .isIntersectionSphere() has been renamed to .intersectsSphere().')
  		return this.intersectsSphere(sphere)
  	},
  	size: function (optionalTarget) {
  		console.warn('THREE.Box3: .size() has been renamed to .getSize().')
  		return this.getSize(optionalTarget)
  	}
  })

  Line3.prototype.center = function (optionalTarget) {
  	console.warn('THREE.Line3: .center() has been renamed to .getCenter().')
  	return this.getCenter(optionalTarget)
  }

  Object.assign(_Math, {

  	random16: function () {
  		console.warn('THREE.Math: .random16() has been deprecated. Use Math.random() instead.')
  		return Math.random()
  	},

  	nearestPowerOfTwo: function (value) {
  		console.warn('THREE.Math: .nearestPowerOfTwo() has been renamed to .floorPowerOfTwo().')
  		return _Math.floorPowerOfTwo(value)
  	},

  	nextPowerOfTwo: function (value) {
  		console.warn('THREE.Math: .nextPowerOfTwo() has been renamed to .ceilPowerOfTwo().')
  		return _Math.ceilPowerOfTwo(value)
  	}

  })

  Object.assign(Matrix3.prototype, {

  	flattenToArrayOffset: function (array, offset) {
  		console.warn('THREE.Matrix3: .flattenToArrayOffset() has been deprecated. Use .toArray() instead.')
  		return this.toArray(array, offset)
  	},
  	multiplyVector3: function (vector) {
  		console.warn('THREE.Matrix3: .multiplyVector3() has been removed. Use vector.applyMatrix3( matrix ) instead.')
  		return vector.applyMatrix3(this)
  	},
  	multiplyVector3Array: function (/* a */) {
  		console.error('THREE.Matrix3: .multiplyVector3Array() has been removed.')
  	},
  	applyToBuffer: function (buffer /*, offset, length */) {
  		console.warn('THREE.Matrix3: .applyToBuffer() has been removed. Use matrix.applyToBufferAttribute( attribute ) instead.')
  		return this.applyToBufferAttribute(buffer)
  	},
  	applyToVector3Array: function (/* array, offset, length */) {
  		console.error('THREE.Matrix3: .applyToVector3Array() has been removed.')
  	}

  })

  Object.assign(Matrix4.prototype, {

  	extractPosition: function (m) {
  		console.warn('THREE.Matrix4: .extractPosition() has been renamed to .copyPosition().')
  		return this.copyPosition(m)
  	},
  	flattenToArrayOffset: function (array, offset) {
  		console.warn('THREE.Matrix4: .flattenToArrayOffset() has been deprecated. Use .toArray() instead.')
  		return this.toArray(array, offset)
  	},
  	getPosition: (function () {
  		var v1

  		return function getPosition () {
  			if (v1 === undefined) v1 = new Vector3()
  			console.warn('THREE.Matrix4: .getPosition() has been removed. Use Vector3.setFromMatrixPosition( matrix ) instead.')
  			return v1.setFromMatrixColumn(this, 3)
  		}
  	}()),
  	setRotationFromQuaternion: function (q) {
  		console.warn('THREE.Matrix4: .setRotationFromQuaternion() has been renamed to .makeRotationFromQuaternion().')
  		return this.makeRotationFromQuaternion(q)
  	},
  	multiplyToArray: function () {
  		console.warn('THREE.Matrix4: .multiplyToArray() has been removed.')
  	},
  	multiplyVector3: function (vector) {
  		console.warn('THREE.Matrix4: .multiplyVector3() has been removed. Use vector.applyMatrix4( matrix ) instead.')
  		return vector.applyMatrix4(this)
  	},
  	multiplyVector4: function (vector) {
  		console.warn('THREE.Matrix4: .multiplyVector4() has been removed. Use vector.applyMatrix4( matrix ) instead.')
  		return vector.applyMatrix4(this)
  	},
  	multiplyVector3Array: function (/* a */) {
  		console.error('THREE.Matrix4: .multiplyVector3Array() has been removed.')
  	},
  	rotateAxis: function (v) {
  		console.warn('THREE.Matrix4: .rotateAxis() has been removed. Use Vector3.transformDirection( matrix ) instead.')
  		v.transformDirection(this)
  	},
  	crossVector: function (vector) {
  		console.warn('THREE.Matrix4: .crossVector() has been removed. Use vector.applyMatrix4( matrix ) instead.')
  		return vector.applyMatrix4(this)
  	},
  	translate: function () {
  		console.error('THREE.Matrix4: .translate() has been removed.')
  	},
  	rotateX: function () {
  		console.error('THREE.Matrix4: .rotateX() has been removed.')
  	},
  	rotateY: function () {
  		console.error('THREE.Matrix4: .rotateY() has been removed.')
  	},
  	rotateZ: function () {
  		console.error('THREE.Matrix4: .rotateZ() has been removed.')
  	},
  	rotateByAxis: function () {
  		console.error('THREE.Matrix4: .rotateByAxis() has been removed.')
  	},
  	applyToBuffer: function (buffer /*, offset, length */) {
  		console.warn('THREE.Matrix4: .applyToBuffer() has been removed. Use matrix.applyToBufferAttribute( attribute ) instead.')
  		return this.applyToBufferAttribute(buffer)
  	},
  	applyToVector3Array: function (/* array, offset, length */) {
  		console.error('THREE.Matrix4: .applyToVector3Array() has been removed.')
  	},
  	makeFrustum: function (left, right, bottom, top, near, far) {
  		console.warn('THREE.Matrix4: .makeFrustum() has been removed. Use .makePerspective( left, right, top, bottom, near, far ) instead.')
  		return this.makePerspective(left, right, top, bottom, near, far)
  	}

  })

  Plane.prototype.isIntersectionLine = function (line) {
  	console.warn('THREE.Plane: .isIntersectionLine() has been renamed to .intersectsLine().')
  	return this.intersectsLine(line)
  }

  Quaternion.prototype.multiplyVector3 = function (vector) {
  	console.warn('THREE.Quaternion: .multiplyVector3() has been removed. Use is now vector.applyQuaternion( quaternion ) instead.')
  	return vector.applyQuaternion(this)
  }

  Object.assign(Ray.prototype, {

  	isIntersectionBox: function (box) {
  		console.warn('THREE.Ray: .isIntersectionBox() has been renamed to .intersectsBox().')
  		return this.intersectsBox(box)
  	},
  	isIntersectionPlane: function (plane) {
  		console.warn('THREE.Ray: .isIntersectionPlane() has been renamed to .intersectsPlane().')
  		return this.intersectsPlane(plane)
  	},
  	isIntersectionSphere: function (sphere) {
  		console.warn('THREE.Ray: .isIntersectionSphere() has been renamed to .intersectsSphere().')
  		return this.intersectsSphere(sphere)
  	}

  })

  Object.assign(Triangle.prototype, {

  	area: function () {
  		console.warn('THREE.Triangle: .area() has been renamed to .getArea().')
  		return this.getArea()
  	},
  	barycoordFromPoint: function (point, target) {
  		console.warn('THREE.Triangle: .barycoordFromPoint() has been renamed to .getBarycoord().')
  		return this.getBarycoord(point, target)
  	},
  	midpoint: function (target) {
  		console.warn('THREE.Triangle: .midpoint() has been renamed to .getMidpoint().')
  		return this.getMidpoint(target)
  	},
  	normal: function (target) {
  		console.warn('THREE.Triangle: .normal() has been renamed to .getNormal().')
  		return this.getNormal(target)
  	},
  	plane: function (target) {
  		console.warn('THREE.Triangle: .plane() has been renamed to .getPlane().')
  		return this.getPlane(target)
  	}

  })

  Object.assign(Triangle, {

  	barycoordFromPoint: function (point, a, b, c, target) {
  		console.warn('THREE.Triangle: .barycoordFromPoint() has been renamed to .getBarycoord().')
  		return Triangle.getBarycoord(point, a, b, c, target)
  	},
  	normal: function (a, b, c, target) {
  		console.warn('THREE.Triangle: .normal() has been renamed to .getNormal().')
  		return Triangle.getNormal(a, b, c, target)
  	}

  })

  Object.assign(Shape.prototype, {

  	extractAllPoints: function (divisions) {
  		console.warn('THREE.Shape: .extractAllPoints() has been removed. Use .extractPoints() instead.')
  		return this.extractPoints(divisions)
  	},
  	extrude: function (options) {
  		console.warn('THREE.Shape: .extrude() has been removed. Use ExtrudeGeometry() instead.')
  		return new ExtrudeGeometry(this, options)
  	},
  	makeGeometry: function (options) {
  		console.warn('THREE.Shape: .makeGeometry() has been removed. Use ShapeGeometry() instead.')
  		return new ShapeGeometry(this, options)
  	}

  })

  Object.assign(Vector2.prototype, {

  	fromAttribute: function (attribute, index, offset) {
  		console.warn('THREE.Vector2: .fromAttribute() has been renamed to .fromBufferAttribute().')
  		return this.fromBufferAttribute(attribute, index, offset)
  	},
  	distanceToManhattan: function (v) {
  		console.warn('THREE.Vector2: .distanceToManhattan() has been renamed to .manhattanDistanceTo().')
  		return this.manhattanDistanceTo(v)
  	},
  	lengthManhattan: function () {
  		console.warn('THREE.Vector2: .lengthManhattan() has been renamed to .manhattanLength().')
  		return this.manhattanLength()
  	}

  })

  Object.assign(Vector3.prototype, {

  	setEulerFromRotationMatrix: function () {
  		console.error('THREE.Vector3: .setEulerFromRotationMatrix() has been removed. Use Euler.setFromRotationMatrix() instead.')
  	},
  	setEulerFromQuaternion: function () {
  		console.error('THREE.Vector3: .setEulerFromQuaternion() has been removed. Use Euler.setFromQuaternion() instead.')
  	},
  	getPositionFromMatrix: function (m) {
  		console.warn('THREE.Vector3: .getPositionFromMatrix() has been renamed to .setFromMatrixPosition().')
  		return this.setFromMatrixPosition(m)
  	},
  	getScaleFromMatrix: function (m) {
  		console.warn('THREE.Vector3: .getScaleFromMatrix() has been renamed to .setFromMatrixScale().')
  		return this.setFromMatrixScale(m)
  	},
  	getColumnFromMatrix: function (index, matrix) {
  		console.warn('THREE.Vector3: .getColumnFromMatrix() has been renamed to .setFromMatrixColumn().')
  		return this.setFromMatrixColumn(matrix, index)
  	},
  	applyProjection: function (m) {
  		console.warn('THREE.Vector3: .applyProjection() has been removed. Use .applyMatrix4( m ) instead.')
  		return this.applyMatrix4(m)
  	},
  	fromAttribute: function (attribute, index, offset) {
  		console.warn('THREE.Vector3: .fromAttribute() has been renamed to .fromBufferAttribute().')
  		return this.fromBufferAttribute(attribute, index, offset)
  	},
  	distanceToManhattan: function (v) {
  		console.warn('THREE.Vector3: .distanceToManhattan() has been renamed to .manhattanDistanceTo().')
  		return this.manhattanDistanceTo(v)
  	},
  	lengthManhattan: function () {
  		console.warn('THREE.Vector3: .lengthManhattan() has been renamed to .manhattanLength().')
  		return this.manhattanLength()
  	}

  })

  Object.assign(Vector4.prototype, {

  	fromAttribute: function (attribute, index, offset) {
  		console.warn('THREE.Vector4: .fromAttribute() has been renamed to .fromBufferAttribute().')
  		return this.fromBufferAttribute(attribute, index, offset)
  	},
  	lengthManhattan: function () {
  		console.warn('THREE.Vector4: .lengthManhattan() has been renamed to .manhattanLength().')
  		return this.manhattanLength()
  	}

  })

  //

  Object.assign(Geometry.prototype, {

  	computeTangents: function () {
  		console.error('THREE.Geometry: .computeTangents() has been removed.')
  	},
  	computeLineDistances: function () {
  		console.error('THREE.Geometry: .computeLineDistances() has been removed. Use THREE.Line.computeLineDistances() instead.')
  	}

  })

  Object.assign(Object3D.prototype, {

  	getChildByName: function (name) {
  		console.warn('THREE.Object3D: .getChildByName() has been renamed to .getObjectByName().')
  		return this.getObjectByName(name)
  	},
  	renderDepth: function () {
  		console.warn('THREE.Object3D: .renderDepth has been removed. Use .renderOrder, instead.')
  	},
  	translate: function (distance, axis) {
  		console.warn('THREE.Object3D: .translate() has been removed. Use .translateOnAxis( axis, distance ) instead.')
  		return this.translateOnAxis(axis, distance)
  	},
  	getWorldRotation: function () {
  		console.error('THREE.Object3D: .getWorldRotation() has been removed. Use THREE.Object3D.getWorldQuaternion( target ) instead.')
  	}

  })

  Object.defineProperties(Object3D.prototype, {

  	eulerOrder: {
  		get: function () {
  			console.warn('THREE.Object3D: .eulerOrder is now .rotation.order.')
  			return this.rotation.order
  		},
  		set: function (value) {
  			console.warn('THREE.Object3D: .eulerOrder is now .rotation.order.')
  			this.rotation.order = value
  		}
  	},
  	useQuaternion: {
  		get: function () {
  			console.warn('THREE.Object3D: .useQuaternion has been removed. The library now uses quaternions by default.')
  		},
  		set: function () {
  			console.warn('THREE.Object3D: .useQuaternion has been removed. The library now uses quaternions by default.')
  		}
  	}

  })

  Object.defineProperties(LOD.prototype, {

  	objects: {
  		get: function () {
  			console.warn('THREE.LOD: .objects has been renamed to .levels.')
  			return this.levels
  		}
  	}

  })

  Object.defineProperty(Skeleton.prototype, 'useVertexTexture', {

  	get: function () {
  		console.warn('THREE.Skeleton: useVertexTexture has been removed.')
  	},
  	set: function () {
  		console.warn('THREE.Skeleton: useVertexTexture has been removed.')
  	}

  })

  Object.defineProperty(Curve.prototype, '__arcLengthDivisions', {

  	get: function () {
  		console.warn('THREE.Curve: .__arcLengthDivisions is now .arcLengthDivisions.')
  		return this.arcLengthDivisions
  	},
  	set: function (value) {
  		console.warn('THREE.Curve: .__arcLengthDivisions is now .arcLengthDivisions.')
  		this.arcLengthDivisions = value
  	}

  })

  //

  PerspectiveCamera.prototype.setLens = function (focalLength, filmGauge) {
  	console.warn('THREE.PerspectiveCamera.setLens is deprecated. ' +
  			'Use .setFocalLength and .filmGauge for a photographic setup.')

  	if (filmGauge !== undefined) this.filmGauge = filmGauge
  	this.setFocalLength(focalLength)
  }

  //

  Object.defineProperties(Light.prototype, {
  	onlyShadow: {
  		set: function () {
  			console.warn('THREE.Light: .onlyShadow has been removed.')
  		}
  	},
  	shadowCameraFov: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowCameraFov is now .shadow.camera.fov.')
  			this.shadow.camera.fov = value
  		}
  	},
  	shadowCameraLeft: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowCameraLeft is now .shadow.camera.left.')
  			this.shadow.camera.left = value
  		}
  	},
  	shadowCameraRight: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowCameraRight is now .shadow.camera.right.')
  			this.shadow.camera.right = value
  		}
  	},
  	shadowCameraTop: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowCameraTop is now .shadow.camera.top.')
  			this.shadow.camera.top = value
  		}
  	},
  	shadowCameraBottom: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowCameraBottom is now .shadow.camera.bottom.')
  			this.shadow.camera.bottom = value
  		}
  	},
  	shadowCameraNear: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowCameraNear is now .shadow.camera.near.')
  			this.shadow.camera.near = value
  		}
  	},
  	shadowCameraFar: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowCameraFar is now .shadow.camera.far.')
  			this.shadow.camera.far = value
  		}
  	},
  	shadowCameraVisible: {
  		set: function () {
  			console.warn('THREE.Light: .shadowCameraVisible has been removed. Use new THREE.CameraHelper( light.shadow.camera ) instead.')
  		}
  	},
  	shadowBias: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowBias is now .shadow.bias.')
  			this.shadow.bias = value
  		}
  	},
  	shadowDarkness: {
  		set: function () {
  			console.warn('THREE.Light: .shadowDarkness has been removed.')
  		}
  	},
  	shadowMapWidth: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowMapWidth is now .shadow.mapSize.width.')
  			this.shadow.mapSize.width = value
  		}
  	},
  	shadowMapHeight: {
  		set: function (value) {
  			console.warn('THREE.Light: .shadowMapHeight is now .shadow.mapSize.height.')
  			this.shadow.mapSize.height = value
  		}
  	}
  })

  //

  Object.defineProperties(BufferAttribute.prototype, {

  	length: {
  		get: function () {
  			console.warn('THREE.BufferAttribute: .length has been deprecated. Use .count instead.')
  			return this.array.length
  		}
  	},
  	copyIndicesArray: function (/* indices */) {
  		console.error('THREE.BufferAttribute: .copyIndicesArray() has been removed.')
  	}

  })

  Object.assign(BufferGeometry.prototype, {

  	addIndex: function (index) {
  		console.warn('THREE.BufferGeometry: .addIndex() has been renamed to .setIndex().')
  		this.setIndex(index)
  	},
  	addDrawCall: function (start, count, indexOffset) {
  		if (indexOffset !== undefined) {
  			console.warn('THREE.BufferGeometry: .addDrawCall() no longer supports indexOffset.')
  		}
  		console.warn('THREE.BufferGeometry: .addDrawCall() is now .addGroup().')
  		this.addGroup(start, count)
  	},
  	clearDrawCalls: function () {
  		console.warn('THREE.BufferGeometry: .clearDrawCalls() is now .clearGroups().')
  		this.clearGroups()
  	},
  	computeTangents: function () {
  		console.warn('THREE.BufferGeometry: .computeTangents() has been removed.')
  	},
  	computeOffsets: function () {
  		console.warn('THREE.BufferGeometry: .computeOffsets() has been removed.')
  	}

  })

  Object.defineProperties(BufferGeometry.prototype, {

  	drawcalls: {
  		get: function () {
  			console.error('THREE.BufferGeometry: .drawcalls has been renamed to .groups.')
  			return this.groups
  		}
  	},
  	offsets: {
  		get: function () {
  			console.warn('THREE.BufferGeometry: .offsets has been renamed to .groups.')
  			return this.groups
  		}
  	}

  })

  //

  Object.assign(ExtrudeBufferGeometry.prototype, {

  	getArrays: function () {
  		console.error('THREE.ExtrudeBufferGeometry: .getArrays() has been removed.')
  	},

  	addShapeList: function () {
  		console.error('THREE.ExtrudeBufferGeometry: .addShapeList() has been removed.')
  	},

  	addShape: function () {
  		console.error('THREE.ExtrudeBufferGeometry: .addShape() has been removed.')
  	}

  })

  //

  Object.defineProperties(Uniform.prototype, {

  	dynamic: {
  		set: function () {
  			console.warn('THREE.Uniform: .dynamic has been removed. Use object.onBeforeRender() instead.')
  		}
  	},
  	onUpdate: {
  		value: function () {
  			console.warn('THREE.Uniform: .onUpdate() has been removed. Use object.onBeforeRender() instead.')
  			return this
  		}
  	}

  })

  //

  Object.defineProperties(Material.prototype, {

  	wrapAround: {
  		get: function () {
  			console.warn('THREE.Material: .wrapAround has been removed.')
  		},
  		set: function () {
  			console.warn('THREE.Material: .wrapAround has been removed.')
  		}
  	},
  	wrapRGB: {
  		get: function () {
  			console.warn('THREE.Material: .wrapRGB has been removed.')
  			return new Color()
  		}
  	},

  	shading: {
  		get: function () {
  			console.error('THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.')
  		},
  		set: function (value) {
  			console.warn('THREE.' + this.type + ': .shading has been removed. Use the boolean .flatShading instead.')
  			this.flatShading = (value === FlatShading)
  		}
  	}

  })

  Object.defineProperties(MeshPhongMaterial.prototype, {

  	metal: {
  		get: function () {
  			console.warn('THREE.MeshPhongMaterial: .metal has been removed. Use THREE.MeshStandardMaterial instead.')
  			return false
  		},
  		set: function () {
  			console.warn('THREE.MeshPhongMaterial: .metal has been removed. Use THREE.MeshStandardMaterial instead')
  		}
  	}

  })

  Object.defineProperties(ShaderMaterial.prototype, {

  	derivatives: {
  		get: function () {
  			console.warn('THREE.ShaderMaterial: .derivatives has been moved to .extensions.derivatives.')
  			return this.extensions.derivatives
  		},
  		set: function (value) {
  			console.warn('THREE. ShaderMaterial: .derivatives has been moved to .extensions.derivatives.')
  			this.extensions.derivatives = value
  		}
  	}

  })

  //

  Object.assign(WebGLRenderer.prototype, {

  	animate: function (callback) {
  		console.warn('THREE.WebGLRenderer: .animate() is now .setAnimationLoop().')
  		this.setAnimationLoop(callback)
  	},

  	getCurrentRenderTarget: function () {
  		console.warn('THREE.WebGLRenderer: .getCurrentRenderTarget() is now .getRenderTarget().')
  		return this.getRenderTarget()
  	},

  	getMaxAnisotropy: function () {
  		console.warn('THREE.WebGLRenderer: .getMaxAnisotropy() is now .capabilities.getMaxAnisotropy().')
  		return this.capabilities.getMaxAnisotropy()
  	},

  	getPrecision: function () {
  		console.warn('THREE.WebGLRenderer: .getPrecision() is now .capabilities.precision.')
  		return this.capabilities.precision
  	},

  	resetGLState: function () {
  		console.warn('THREE.WebGLRenderer: .resetGLState() is now .state.reset().')
  		return this.state.reset()
  	},

  	supportsFloatTextures: function () {
  		console.warn('THREE.WebGLRenderer: .supportsFloatTextures() is now .extensions.get( \'OES_texture_float\' ).')
  		return this.extensions.get('OES_texture_float')
  	},
  	supportsHalfFloatTextures: function () {
  		console.warn('THREE.WebGLRenderer: .supportsHalfFloatTextures() is now .extensions.get( \'OES_texture_half_float\' ).')
  		return this.extensions.get('OES_texture_half_float')
  	},
  	supportsStandardDerivatives: function () {
  		console.warn('THREE.WebGLRenderer: .supportsStandardDerivatives() is now .extensions.get( \'OES_standard_derivatives\' ).')
  		return this.extensions.get('OES_standard_derivatives')
  	},
  	supportsCompressedTextureS3TC: function () {
  		console.warn('THREE.WebGLRenderer: .supportsCompressedTextureS3TC() is now .extensions.get( \'WEBGL_compressed_texture_s3tc\' ).')
  		return this.extensions.get('WEBGL_compressed_texture_s3tc')
  	},
  	supportsCompressedTexturePVRTC: function () {
  		console.warn('THREE.WebGLRenderer: .supportsCompressedTexturePVRTC() is now .extensions.get( \'WEBGL_compressed_texture_pvrtc\' ).')
  		return this.extensions.get('WEBGL_compressed_texture_pvrtc')
  	},
  	supportsBlendMinMax: function () {
  		console.warn('THREE.WebGLRenderer: .supportsBlendMinMax() is now .extensions.get( \'EXT_blend_minmax\' ).')
  		return this.extensions.get('EXT_blend_minmax')
  	},
  	supportsVertexTextures: function () {
  		console.warn('THREE.WebGLRenderer: .supportsVertexTextures() is now .capabilities.vertexTextures.')
  		return this.capabilities.vertexTextures
  	},
  	supportsInstancedArrays: function () {
  		console.warn('THREE.WebGLRenderer: .supportsInstancedArrays() is now .extensions.get( \'ANGLE_instanced_arrays\' ).')
  		return this.extensions.get('ANGLE_instanced_arrays')
  	},
  	enableScissorTest: function (boolean) {
  		console.warn('THREE.WebGLRenderer: .enableScissorTest() is now .setScissorTest().')
  		this.setScissorTest(boolean)
  	},
  	initMaterial: function () {
  		console.warn('THREE.WebGLRenderer: .initMaterial() has been removed.')
  	},
  	addPrePlugin: function () {
  		console.warn('THREE.WebGLRenderer: .addPrePlugin() has been removed.')
  	},
  	addPostPlugin: function () {
  		console.warn('THREE.WebGLRenderer: .addPostPlugin() has been removed.')
  	},
  	updateShadowMap: function () {
  		console.warn('THREE.WebGLRenderer: .updateShadowMap() has been removed.')
  	},
  	setFaceCulling: function () {
  		console.warn('THREE.WebGLRenderer: .setFaceCulling() has been removed.')
  	}

  })

  Object.defineProperties(WebGLRenderer.prototype, {

  	shadowMapEnabled: {
  		get: function () {
  			return this.shadowMap.enabled
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderer: .shadowMapEnabled is now .shadowMap.enabled.')
  			this.shadowMap.enabled = value
  		}
  	},
  	shadowMapType: {
  		get: function () {
  			return this.shadowMap.type
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderer: .shadowMapType is now .shadowMap.type.')
  			this.shadowMap.type = value
  		}
  	},
  	shadowMapCullFace: {
  		get: function () {
  			console.warn('THREE.WebGLRenderer: .shadowMapCullFace has been removed. Set Material.shadowSide instead.')
  			return undefined
  		},
  		set: function (/* value */) {
  			console.warn('THREE.WebGLRenderer: .shadowMapCullFace has been removed. Set Material.shadowSide instead.')
  		}
  	}
  })

  Object.defineProperties(WebGLShadowMap.prototype, {

  	cullFace: {
  		get: function () {
  			console.warn('THREE.WebGLRenderer: .shadowMap.cullFace has been removed. Set Material.shadowSide instead.')
  			return undefined
  		},
  		set: function (/* cullFace */) {
  			console.warn('THREE.WebGLRenderer: .shadowMap.cullFace has been removed. Set Material.shadowSide instead.')
  		}
  	},
  	renderReverseSided: {
  		get: function () {
  			console.warn('THREE.WebGLRenderer: .shadowMap.renderReverseSided has been removed. Set Material.shadowSide instead.')
  			return undefined
  		},
  		set: function () {
  			console.warn('THREE.WebGLRenderer: .shadowMap.renderReverseSided has been removed. Set Material.shadowSide instead.')
  		}
  	},
  	renderSingleSided: {
  		get: function () {
  			console.warn('THREE.WebGLRenderer: .shadowMap.renderSingleSided has been removed. Set Material.shadowSide instead.')
  			return undefined
  		},
  		set: function () {
  			console.warn('THREE.WebGLRenderer: .shadowMap.renderSingleSided has been removed. Set Material.shadowSide instead.')
  		}
  	}

  })

  //

  Object.defineProperties(WebGLRenderTarget.prototype, {

  	wrapS: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .wrapS is now .texture.wrapS.')
  			return this.texture.wrapS
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .wrapS is now .texture.wrapS.')
  			this.texture.wrapS = value
  		}
  	},
  	wrapT: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .wrapT is now .texture.wrapT.')
  			return this.texture.wrapT
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .wrapT is now .texture.wrapT.')
  			this.texture.wrapT = value
  		}
  	},
  	magFilter: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .magFilter is now .texture.magFilter.')
  			return this.texture.magFilter
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .magFilter is now .texture.magFilter.')
  			this.texture.magFilter = value
  		}
  	},
  	minFilter: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .minFilter is now .texture.minFilter.')
  			return this.texture.minFilter
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .minFilter is now .texture.minFilter.')
  			this.texture.minFilter = value
  		}
  	},
  	anisotropy: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .anisotropy is now .texture.anisotropy.')
  			return this.texture.anisotropy
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .anisotropy is now .texture.anisotropy.')
  			this.texture.anisotropy = value
  		}
  	},
  	offset: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .offset is now .texture.offset.')
  			return this.texture.offset
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .offset is now .texture.offset.')
  			this.texture.offset = value
  		}
  	},
  	repeat: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .repeat is now .texture.repeat.')
  			return this.texture.repeat
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .repeat is now .texture.repeat.')
  			this.texture.repeat = value
  		}
  	},
  	format: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .format is now .texture.format.')
  			return this.texture.format
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .format is now .texture.format.')
  			this.texture.format = value
  		}
  	},
  	type: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .type is now .texture.type.')
  			return this.texture.type
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .type is now .texture.type.')
  			this.texture.type = value
  		}
  	},
  	generateMipmaps: {
  		get: function () {
  			console.warn('THREE.WebGLRenderTarget: .generateMipmaps is now .texture.generateMipmaps.')
  			return this.texture.generateMipmaps
  		},
  		set: function (value) {
  			console.warn('THREE.WebGLRenderTarget: .generateMipmaps is now .texture.generateMipmaps.')
  			this.texture.generateMipmaps = value
  		}
  	}

  })

  //

  Object.defineProperties(WebVRManager.prototype, {

  	standing: {
  		set: function (/* value */) {
  			console.warn('THREE.WebVRManager: .standing has been removed.')
  		}
  	}

  })

  //

  Audio.prototype.load = function (file) {
  	console.warn('THREE.Audio: .load has been deprecated. Use THREE.AudioLoader instead.')
  	var scope = this
  	var audioLoader = new AudioLoader()
  	audioLoader.load(file, function (buffer) {
  		scope.setBuffer(buffer)
  	})
  	return this
  }

  AudioAnalyser.prototype.getData = function () {
  	console.warn('THREE.AudioAnalyser: .getData() is now .getFrequencyData().')
  	return this.getFrequencyData()
  }

  //

  CubeCamera.prototype.updateCubeMap = function (renderer, scene) {
  	console.warn('THREE.CubeCamera: .updateCubeMap() is now .update().')
  	return this.update(renderer, scene)
  }

  /**
   * @author dmarcos / https://github.com/dmarcos
   * @author mrdoob / http://mrdoob.com
   */
  var VRControls = function (object, onError) {
  	var scope = this

  	var vrDisplay, vrDisplays

  	var standingMatrix = new Matrix4()

  	var frameData = null

  	if ('VRFrameData' in window) {
  		frameData = new VRFrameData()
  	}

  	function gotVRDisplays (displays) {
  		vrDisplays = displays

  		if (displays.length > 0) {
  			vrDisplay = displays[0]
  		} else {
  			if (onError) onError('VR input not available.')
  		}
  	}

  	if (navigator.getVRDisplays) {
  		navigator.getVRDisplays().then(gotVRDisplays).catch(function () {
  			console.warn('VRControls: Unable to get VR Displays')
  		})
  	}

  	// the Rift SDK returns the position in meters
  	// this scale factor allows the user to define how meters
  	// are converted to scene units.

  	this.scale = 1

  	// If true will use "standing space" coordinate system where y=0 is the
  	// floor and x=0, z=0 is the center of the room.
  	this.standing = false

  	// Distance from the users eyes to the floor in meters. Used when
  	// standing=true but the VRDisplay doesn't provide stageParameters.
  	this.userHeight = 1.6

  	this.getVRDisplay = function () {
  		return vrDisplay
  	}

  	this.setVRDisplay = function (value) {
  		vrDisplay = value
  	}

  	this.getVRDisplays = function () {
  		console.warn('VRControls: getVRDisplays() is being deprecated.')
  		return vrDisplays
  	}

  	this.getStandingMatrix = function () {
  		return standingMatrix
  	}

  	this.update = function () {
  		if (vrDisplay) {
  			var pose

  			if (vrDisplay.getFrameData) {
  				vrDisplay.getFrameData(frameData)
  				pose = frameData.pose
  			} else if (vrDisplay.getPose) {
  				pose = vrDisplay.getPose()
  			}

  			if (pose.orientation !== null) {
  				object.quaternion.fromArray(pose.orientation)
  			}

  			if (pose.position !== null) {
  				object.position.fromArray(pose.position)
  			} else {
  				object.position.set(0, 0, 0)
  			}

  			if (this.standing) {
  				if (vrDisplay.stageParameters) {
  					object.updateMatrix()

  					standingMatrix.fromArray(vrDisplay.stageParameters.sittingToStandingTransform)
  					object.applyMatrix(standingMatrix)
  				} else {
  					object.position.setY(object.position.y + this.userHeight)
  				}
  			}

  			object.position.multiplyScalar(scope.scale)
  		}
  	}

  	this.dispose = function () {
  		vrDisplay = null
  	}
  }

  /**
   * @author dmarcos / https://github.com/dmarcos
   * @author mrdoob / http://mrdoob.com
   *
   * WebVR Spec: http://mozvr.github.io/webvr-spec/webvr.html
   *
   * Firefox: http://mozvr.com/downloads/
   * Chromium: https://webvr.info/get-chrome
   */
  var VREffect = function (renderer, onError) {
  	var vrDisplay, vrDisplays
  	var eyeTranslationL = new Vector3()
  	var eyeTranslationR = new Vector3()
  	var renderRectL, renderRectR
  	var headMatrix = new Matrix4()
  	var eyeMatrixL = new Matrix4()
  	var eyeMatrixR = new Matrix4()

  	var frameData = null

  	if ('VRFrameData' in window) {
  		frameData = new window.VRFrameData()
  	}

  	function gotVRDisplays (displays) {
  		vrDisplays = displays

  		if (displays.length > 0) {
  			vrDisplay = displays[0]
  		} else {
  			if (onError) onError('HMD not available')
  		}
  	}

  	if (navigator.getVRDisplays) {
  		navigator.getVRDisplays().then(gotVRDisplays).catch(function () {
  			console.warn('VREffect: Unable to get VR Displays')
  		})
  	}

  	//

  	this.isPresenting = false

  	var scope = this

  	var rendererSize = renderer.getSize()
  	var rendererUpdateStyle = false
  	var rendererPixelRatio = renderer.getPixelRatio()

  	this.getVRDisplay = function () {
  		return vrDisplay
  	}

  	this.setVRDisplay = function (value) {
  		vrDisplay = value
  	}

  	this.getVRDisplays = function () {
  		console.warn('VREffect: getVRDisplays() is being deprecated.')
  		return vrDisplays
  	}

  	this.setSize = function (width, height, updateStyle) {
  		rendererSize = { width: width, height: height }
  		rendererUpdateStyle = updateStyle

  		if (scope.isPresenting) {
  			var eyeParamsL = vrDisplay.getEyeParameters('left')
  			renderer.setPixelRatio(1)
  			renderer.setSize(eyeParamsL.renderWidth * 2, eyeParamsL.renderHeight, false)
  		} else {
  			renderer.setPixelRatio(rendererPixelRatio)
  			renderer.setSize(width, height, updateStyle)
  		}
  	}

  	// VR presentation

  	var canvas = renderer.domElement
  	var defaultLeftBounds = [0.0, 0.0, 0.5, 1.0]
  	var defaultRightBounds = [0.5, 0.0, 0.5, 1.0]

  	function onVRDisplayPresentChange () {
  		var wasPresenting = scope.isPresenting
  		scope.isPresenting = vrDisplay !== undefined && vrDisplay.isPresenting

  		if (scope.isPresenting) {
  			var eyeParamsL = vrDisplay.getEyeParameters('left')
  			var eyeWidth = eyeParamsL.renderWidth
  			var eyeHeight = eyeParamsL.renderHeight

  			if (!wasPresenting) {
  				rendererPixelRatio = renderer.getPixelRatio()
  				rendererSize = renderer.getSize()

  				renderer.setPixelRatio(1)
  				renderer.setSize(eyeWidth * 2, eyeHeight, false)
  			}
  		} else if (wasPresenting) {
  			renderer.setPixelRatio(rendererPixelRatio)
  			renderer.setSize(rendererSize.width, rendererSize.height, rendererUpdateStyle)
  		}
  	}

  	window.addEventListener('vrdisplaypresentchange', onVRDisplayPresentChange, false)

  	this.setFullScreen = function (boolean) {
  		return new Promise(function (resolve, reject) {
  			if (vrDisplay === undefined) {
  				reject(new Error('No VR hardware found.'))
  				return
  			}

  			if (scope.isPresenting === boolean) {
  				resolve()
  				return
  			}

  			if (boolean) {
  				resolve(vrDisplay.requestPresent([{ source: canvas }]))
  			} else {
  				resolve(vrDisplay.exitPresent())
  			}
  		})
  	}

  	this.requestPresent = function () {
  		return this.setFullScreen(true)
  	}

  	this.exitPresent = function () {
  		return this.setFullScreen(false)
  	}

  	this.requestAnimationFrame = function (f) {
  		if (vrDisplay !== undefined) {
  			return vrDisplay.requestAnimationFrame(f)
  		} else {
  			return window.requestAnimationFrame(f)
  		}
  	}

  	this.cancelAnimationFrame = function (h) {
  		if (vrDisplay !== undefined) {
  			vrDisplay.cancelAnimationFrame(h)
  		} else {
  			window.cancelAnimationFrame(h)
  		}
  	}

  	this.submitFrame = function () {
  		if (vrDisplay !== undefined && scope.isPresenting) {
  			vrDisplay.submitFrame()
  		}
  	}

  	this.autoSubmitFrame = true

  	// render

  	var cameraL = new PerspectiveCamera()
  	cameraL.layers.enable(1)

  	var cameraR = new PerspectiveCamera()
  	cameraR.layers.enable(2)

  	this.render = function (scene, camera, renderTarget, forceClear) {
  		if (vrDisplay && scope.isPresenting) {
  			var autoUpdate = scene.autoUpdate

  			if (autoUpdate) {
  				scene.updateMatrixWorld()
  				scene.autoUpdate = false
  			}

  			if (Array.isArray(scene)) {
  				console.warn('VREffect.render() no longer supports arrays. Use object.layers instead.')
  				scene = scene[0]
  			}

  			// When rendering we don't care what the recommended size is, only what the actual size
  			// of the backbuffer is.
  			var size = renderer.getSize()
  			var layers = vrDisplay.getLayers()
  			var leftBounds
  			var rightBounds

  			if (layers.length) {
  				var layer = layers[0]

  				leftBounds = layer.leftBounds !== null && layer.leftBounds.length === 4 ? layer.leftBounds : defaultLeftBounds
  				rightBounds = layer.rightBounds !== null && layer.rightBounds.length === 4 ? layer.rightBounds : defaultRightBounds
  			} else {
  				leftBounds = defaultLeftBounds
  				rightBounds = defaultRightBounds
  			}

  			renderRectL = {
  				x: Math.round(size.width * leftBounds[0]),
  				y: Math.round(size.height * leftBounds[1]),
  				width: Math.round(size.width * leftBounds[2]),
  				height: Math.round(size.height * leftBounds[3])
  			}
  			renderRectR = {
  				x: Math.round(size.width * rightBounds[0]),
  				y: Math.round(size.height * rightBounds[1]),
  				width: Math.round(size.width * rightBounds[2]),
  				height: Math.round(size.height * rightBounds[3])
  			}

  			if (renderTarget) {
  				renderer.setRenderTarget(renderTarget)
  				renderTarget.scissorTest = true
  			} else {
  				renderer.setRenderTarget(null)
  				renderer.setScissorTest(true)
  			}

  			if (renderer.autoClear || forceClear) renderer.clear()

  			if (camera.parent === null) camera.updateMatrixWorld()

  			camera.matrixWorld.decompose(cameraL.position, cameraL.quaternion, cameraL.scale)

  			cameraR.position.copy(cameraL.position)
  			cameraR.quaternion.copy(cameraL.quaternion)
  			cameraR.scale.copy(cameraL.scale)

  			if (vrDisplay.getFrameData) {
  				vrDisplay.depthNear = camera.near
  				vrDisplay.depthFar = camera.far

  				vrDisplay.getFrameData(frameData)

  				cameraL.projectionMatrix.elements = frameData.leftProjectionMatrix
  				cameraR.projectionMatrix.elements = frameData.rightProjectionMatrix

  				getEyeMatrices(frameData)

  				cameraL.updateMatrix()
  				cameraL.matrix.multiply(eyeMatrixL)
  				cameraL.matrix.decompose(cameraL.position, cameraL.quaternion, cameraL.scale)

  				cameraR.updateMatrix()
  				cameraR.matrix.multiply(eyeMatrixR)
  				cameraR.matrix.decompose(cameraR.position, cameraR.quaternion, cameraR.scale)
  			} else {
  				var eyeParamsL = vrDisplay.getEyeParameters('left')
  				var eyeParamsR = vrDisplay.getEyeParameters('right')

  				cameraL.projectionMatrix = fovToProjection(eyeParamsL.fieldOfView, true, camera.near, camera.far)
  				cameraR.projectionMatrix = fovToProjection(eyeParamsR.fieldOfView, true, camera.near, camera.far)

  				eyeTranslationL.fromArray(eyeParamsL.offset)
  				eyeTranslationR.fromArray(eyeParamsR.offset)

  				cameraL.translateOnAxis(eyeTranslationL, cameraL.scale.x)
  				cameraR.translateOnAxis(eyeTranslationR, cameraR.scale.x)
  			}

  			// render left eye
  			if (renderTarget) {
  				renderTarget.viewport.set(renderRectL.x, renderRectL.y, renderRectL.width, renderRectL.height)
  				renderTarget.scissor.set(renderRectL.x, renderRectL.y, renderRectL.width, renderRectL.height)
  			} else {
  				renderer.setViewport(renderRectL.x, renderRectL.y, renderRectL.width, renderRectL.height)
  				renderer.setScissor(renderRectL.x, renderRectL.y, renderRectL.width, renderRectL.height)
  			}
  			renderer.render(scene, cameraL, renderTarget, forceClear)

  			// render right eye
  			if (renderTarget) {
  				renderTarget.viewport.set(renderRectR.x, renderRectR.y, renderRectR.width, renderRectR.height)
  				renderTarget.scissor.set(renderRectR.x, renderRectR.y, renderRectR.width, renderRectR.height)
  			} else {
  				renderer.setViewport(renderRectR.x, renderRectR.y, renderRectR.width, renderRectR.height)
  				renderer.setScissor(renderRectR.x, renderRectR.y, renderRectR.width, renderRectR.height)
  			}
  			renderer.render(scene, cameraR, renderTarget, forceClear)

  			if (renderTarget) {
  				renderTarget.viewport.set(0, 0, size.width, size.height)
  				renderTarget.scissor.set(0, 0, size.width, size.height)
  				renderTarget.scissorTest = false
  				renderer.setRenderTarget(null)
  			} else {
  				renderer.setViewport(0, 0, size.width, size.height)
  				renderer.setScissorTest(false)
  			}

  			if (autoUpdate) {
  				scene.autoUpdate = true
  			}

  			if (scope.autoSubmitFrame) {
  				scope.submitFrame()
  			}

  			return
  		}

  		// Regular render mode if not HMD

  		renderer.render(scene, camera, renderTarget, forceClear)
  	}

  	this.dispose = function () {
  		window.removeEventListener('vrdisplaypresentchange', onVRDisplayPresentChange, false)
  	}

  	//

  	var poseOrientation = new Quaternion()
  	var posePosition = new Vector3()

  	// Compute model matrices of the eyes with respect to the head.
  	function getEyeMatrices (frameData) {
  		// Compute the matrix for the position of the head based on the pose
  		if (frameData.pose.orientation) {
  			poseOrientation.fromArray(frameData.pose.orientation)
  			headMatrix.makeRotationFromQuaternion(poseOrientation)
  		}	else {
  			headMatrix.identity()
  		}

  		if (frameData.pose.position) {
  			posePosition.fromArray(frameData.pose.position)
  			headMatrix.setPosition(posePosition)
  		}

  		// The view matrix transforms vertices from sitting space to eye space. As such, the view matrix can be thought of as a product of two matrices:
  		// headToEyeMatrix * sittingToHeadMatrix

  		// The headMatrix that we've calculated above is the model matrix of the head in sitting space, which is the inverse of sittingToHeadMatrix.
  		// So when we multiply the view matrix with headMatrix, we're left with headToEyeMatrix:
  		// viewMatrix * headMatrix = headToEyeMatrix * sittingToHeadMatrix * headMatrix = headToEyeMatrix

  		eyeMatrixL.fromArray(frameData.leftViewMatrix)
  		eyeMatrixL.multiply(headMatrix)
  		eyeMatrixR.fromArray(frameData.rightViewMatrix)
  		eyeMatrixR.multiply(headMatrix)

  		// The eye's model matrix in head space is the inverse of headToEyeMatrix we calculated above.

  		eyeMatrixL.getInverse(eyeMatrixL)
  		eyeMatrixR.getInverse(eyeMatrixR)
  	}

  	function fovToNDCScaleOffset (fov) {
  		var pxscale = 2.0 / (fov.leftTan + fov.rightTan)
  		var pxoffset = (fov.leftTan - fov.rightTan) * pxscale * 0.5
  		var pyscale = 2.0 / (fov.upTan + fov.downTan)
  		var pyoffset = (fov.upTan - fov.downTan) * pyscale * 0.5
  		return { scale: [pxscale, pyscale], offset: [pxoffset, pyoffset] }
  	}

  	function fovPortToProjection (fov, rightHanded, zNear, zFar) {
  		rightHanded = rightHanded === undefined ? true : rightHanded
  		zNear = zNear === undefined ? 0.01 : zNear
  		zFar = zFar === undefined ? 10000.0 : zFar

  		var handednessScale = rightHanded ? -1.0 : 1.0

  		// start with an identity matrix
  		var mobj = new Matrix4()
  		var m = mobj.elements

  		// and with scale/offset info for normalized device coords
  		var scaleAndOffset = fovToNDCScaleOffset(fov)

  		// X result, map clip edges to [-w,+w]
  		m[0 * 4 + 0] = scaleAndOffset.scale[0]
  		m[0 * 4 + 1] = 0.0
  		m[0 * 4 + 2] = scaleAndOffset.offset[0] * handednessScale
  		m[0 * 4 + 3] = 0.0

  		// Y result, map clip edges to [-w,+w]
  		// Y offset is negated because this proj matrix transforms from world coords with Y=up,
  		// but the NDC scaling has Y=down (thanks D3D?)
  		m[1 * 4 + 0] = 0.0
  		m[1 * 4 + 1] = scaleAndOffset.scale[1]
  		m[1 * 4 + 2] = -scaleAndOffset.offset[1] * handednessScale
  		m[1 * 4 + 3] = 0.0

  		// Z result (up to the app)
  		m[2 * 4 + 0] = 0.0
  		m[2 * 4 + 1] = 0.0
  		m[2 * 4 + 2] = zFar / (zNear - zFar) * -handednessScale
  		m[2 * 4 + 3] = (zFar * zNear) / (zNear - zFar)

  		// W result (= Z in)
  		m[3 * 4 + 0] = 0.0
  		m[3 * 4 + 1] = 0.0
  		m[3 * 4 + 2] = handednessScale
  		m[3 * 4 + 3] = 0.0

  		mobj.transpose()
  		return mobj
  	}

  	function fovToProjection (fov, rightHanded, zNear, zFar) {
  		var DEG2RAD = Math.PI / 180.0

  		var fovPort = {
  			upTan: Math.tan(fov.upDegrees * DEG2RAD),
  			downTan: Math.tan(fov.downDegrees * DEG2RAD),
  			leftTan: Math.tan(fov.leftDegrees * DEG2RAD),
  			rightTan: Math.tan(fov.rightDegrees * DEG2RAD)
  		}

  		return fovPortToProjection(fovPort, rightHanded, zNear, zFar)
  	}
  }

  /**
   * @author qiao / https://github.com/qiao
   * @author mrdoob / http://mrdoob.com
   * @author alteredq / http://alteredqualia.com/
   * @author WestLangley / http://github.com/WestLangley
   * @author erich666 / http://erichaines.com
   */
  var OrbitControls = function (object, domElement) {
  	this.object = object

  	this.domElement = (domElement !== undefined) ? domElement : document

  	// Set to false to disable this control
  	this.enabled = true

  	// "target" sets the location of focus, where the object orbits around
  	this.target = new Vector3()

  	// How far you can dolly in and out ( PerspectiveCamera only )
  	this.minDistance = 0
  	this.maxDistance = Infinity

  	// How far you can zoom in and out ( OrthographicCamera only )
  	this.minZoom = 0
  	this.maxZoom = Infinity

  	// How far you can orbit vertically, upper and lower limits.
  	// Range is 0 to Math.PI radians.
  	this.minPolarAngle = 0 // radians
  	this.maxPolarAngle = Math.PI // radians

  	// How far you can orbit horizontally, upper and lower limits.
  	// If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
  	this.minAzimuthAngle = -Infinity // radians
  	this.maxAzimuthAngle = Infinity // radians

  	// Set to true to enable damping (inertia)
  	// If damping is enabled, you must call controls.update() in your animation loop
  	this.enableDamping = false
  	this.dampingFactor = 0.25

  	// This option actually enables dollying in and out; left as "zoom" for backwards compatibility.
  	// Set to false to disable zooming
  	this.enableZoom = true
  	this.zoomSpeed = 1.0

  	// Set to false to disable rotating
  	this.enableRotate = true
  	this.rotateSpeed = 1.0

  	// Set to false to disable panning
  	this.enablePan = true
  	this.panSpeed = 1.0
  	this.screenSpacePanning = false // if true, pan in screen-space
  	this.keyPanSpeed = 7.0	// pixels moved per arrow key push

  	// Set to true to automatically rotate around the target
  	// If auto-rotate is enabled, you must call controls.update() in your animation loop
  	this.autoRotate = false
  	this.autoRotateSpeed = 2.0 // 30 seconds per round when fps is 60

  	// Set to false to disable use of the keys
  	this.enableKeys = true

  	// The four arrow keys
  	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 }

  	// Mouse buttons
  	this.mouseButtons = { ORBIT: MOUSE.LEFT, ZOOM: MOUSE.MIDDLE, PAN: MOUSE.RIGHT }

  	// for reset
  	this.target0 = this.target.clone()
  	this.position0 = this.object.position.clone()
  	this.zoom0 = this.object.zoom

  	//
  	// public methods
  	//

  	this.getPolarAngle = function () {
  		return spherical.phi
  	}

  	this.getAzimuthalAngle = function () {
  		return spherical.theta
  	}

  	this.saveState = function () {
  		scope.target0.copy(scope.target)
  		scope.position0.copy(scope.object.position)
  		scope.zoom0 = scope.object.zoom
  	}

  	this.reset = function () {
  		scope.target.copy(scope.target0)
  		scope.object.position.copy(scope.position0)
  		scope.object.zoom = scope.zoom0

  		scope.object.updateProjectionMatrix()
  		scope.dispatchEvent(changeEvent)

  		scope.update()

  		state = STATE.NONE
  	}

  	// this method is exposed, but perhaps it would be better if we can make it private...
  	this.update = (function () {
  		var offset = new Vector3()

  		// so camera.up is the orbit axis
  		var quat = new Quaternion().setFromUnitVectors(object.up, new Vector3(0, 1, 0))
  		var quatInverse = quat.clone().inverse()

  		var lastPosition = new Vector3()
  		var lastQuaternion = new Quaternion()

  		return function update () {
  			var position = scope.object.position

  			offset.copy(position).sub(scope.target)

  			// rotate offset to "y-axis-is-up" space
  			offset.applyQuaternion(quat)

  			// angle from z-axis around y-axis
  			spherical.setFromVector3(offset)

  			if (scope.autoRotate && state === STATE.NONE) {
  				scope.rotateLeft(getAutoRotationAngle())
  			}

  			spherical.theta += sphericalDelta.theta
  			spherical.phi += sphericalDelta.phi

  			// restrict theta to be between desired limits
  			spherical.theta = Math.max(scope.minAzimuthAngle, Math.min(scope.maxAzimuthAngle, spherical.theta))

  			// restrict phi to be between desired limits
  			spherical.phi = Math.max(scope.minPolarAngle, Math.min(scope.maxPolarAngle, spherical.phi))

  			spherical.makeSafe()

  			spherical.radius *= scale

  			// restrict radius to be between desired limits
  			spherical.radius = Math.max(scope.minDistance, Math.min(scope.maxDistance, spherical.radius))

  			// move target to panned location
  			scope.target.add(panOffset)

  			offset.setFromSpherical(spherical)

  			// rotate offset back to "camera-up-vector-is-up" space
  			offset.applyQuaternion(quatInverse)

  			position.copy(scope.target).add(offset)

  			scope.object.lookAt(scope.target)

  			if (scope.enableDamping === true) {
  				sphericalDelta.theta *= (1 - scope.dampingFactor)
  				sphericalDelta.phi *= (1 - scope.dampingFactor)

  				panOffset.multiplyScalar(1 - scope.dampingFactor)
  			} else {
  				sphericalDelta.set(0, 0, 0)

  				panOffset.set(0, 0, 0)
  			}

  			scale = 1

  			// update condition is:
  			// min(camera displacement, camera rotation in radians)^2 > EPS
  			// using small-angle approximation cos(x/2) = 1 - x^2 / 8

  			if (zoomChanged ||
  				lastPosition.distanceToSquared(scope.object.position) > EPS ||
  				8 * (1 - lastQuaternion.dot(scope.object.quaternion)) > EPS) {
  				scope.dispatchEvent(changeEvent)

  				lastPosition.copy(scope.object.position)
  				lastQuaternion.copy(scope.object.quaternion)
  				zoomChanged = false

  				return true
  			}

  			return false
  		}
  	}())

  	this.dispose = function () {
  		scope.domElement.removeEventListener('contextmenu', onContextMenu, false)
  		scope.domElement.removeEventListener('mousedown', onMouseDown, false)
  		scope.domElement.removeEventListener('wheel', onMouseWheel, false)

  		scope.domElement.removeEventListener('touchstart', onTouchStart, false)
  		scope.domElement.removeEventListener('touchend', onTouchEnd, false)
  		scope.domElement.removeEventListener('touchmove', onTouchMove, false)

  		document.removeEventListener('mousemove', onMouseMove, false)
  		document.removeEventListener('mouseup', onMouseUp, false)

  		window.removeEventListener('keydown', onKeyDown, false)

  		// scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?
  	}

  	//
  	// internals
  	//

  	var scope = this

  	var changeEvent = { type: 'change' }
  	var startEvent = { type: 'start' }
  	var endEvent = { type: 'end' }

  	var STATE = { NONE: -1, ROTATE: 0, DOLLY: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_DOLLY_PAN: 4 }

  	var state = STATE.NONE

  	var EPS = 0.000001

  	// current position in spherical coordinates
  	var spherical = new Spherical()
  	var sphericalDelta = new Spherical()

  	var scale = 1
  	var panOffset = new Vector3()
  	var zoomChanged = false

  	var rotateStart = new Vector2()
  	var rotateEnd = new Vector2()
  	var rotateDelta = new Vector2()

  	var panStart = new Vector2()
  	var panEnd = new Vector2()
  	var panDelta = new Vector2()

  	var dollyStart = new Vector2()
  	var dollyEnd = new Vector2()
  	var dollyDelta = new Vector2()

  	function getAutoRotationAngle () {
  		return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed
  	}

  	function getZoomScale () {
  		return Math.pow(0.95, scope.zoomSpeed)
  	}

  	scope.rotateLeft = function (angle) {
  		sphericalDelta.theta -= angle
  	}

  	scope.rotateUp = function (angle) {
  		sphericalDelta.phi -= angle
  	}

  	var panLeft = (function () {
  		var v = new Vector3()

  		return function panLeft (distance, objectMatrix) {
  			v.setFromMatrixColumn(objectMatrix, 0) // get X column of objectMatrix
  			v.multiplyScalar(-distance)

  			panOffset.add(v)
  		}
  	}())

  	var panUp = (function () {
  		var v = new Vector3()

  		return function panUp (distance, objectMatrix) {
  			if (scope.screenSpacePanning === true) {
  				v.setFromMatrixColumn(objectMatrix, 1)
  			} else {
  				v.setFromMatrixColumn(objectMatrix, 0)
  				v.crossVectors(scope.object.up, v)
  			}

  			v.multiplyScalar(distance)

  			panOffset.add(v)
  		}
  	}())

  	// deltaX and deltaY are in pixels; right and down are positive
  	var pan = (function () {
  		var offset = new Vector3()

  		return function pan (deltaX, deltaY) {
  			var element = scope.domElement === document ? scope.domElement.body : scope.domElement

  			if (scope.object.isPerspectiveCamera) {
  				// perspective
  				var position = scope.object.position
  				offset.copy(position).sub(scope.target)
  				var targetDistance = offset.length()

  				// half of the fov is center to top of screen
  				targetDistance *= Math.tan((scope.object.fov / 2) * Math.PI / 180.0)

  				// we use only clientHeight here so aspect ratio does not distort speed
  				panLeft(2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix)
  				panUp(2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix)
  			} else if (scope.object.isOrthographicCamera) {
  				// orthographic
  				panLeft(deltaX * (scope.object.right - scope.object.left) / scope.object.zoom / element.clientWidth, scope.object.matrix)
  				panUp(deltaY * (scope.object.top - scope.object.bottom) / scope.object.zoom / element.clientHeight, scope.object.matrix)
  			} else {
  				// camera neither orthographic nor perspective
  				console.warn('WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.')
  				scope.enablePan = false
  			}
  		}
  	}())

  	function dollyIn (dollyScale) {
  		if (scope.object.isPerspectiveCamera) {
  			scale /= dollyScale
  		} else if (scope.object.isOrthographicCamera) {
  			scope.object.zoom = Math.max(scope.minZoom, Math.min(scope.maxZoom, scope.object.zoom * dollyScale))
  			scope.object.updateProjectionMatrix()
  			zoomChanged = true
  		} else {
  			console.warn('WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.')
  			scope.enableZoom = false
  		}
  	}

  	function dollyOut (dollyScale) {
  		if (scope.object.isPerspectiveCamera) {
  			scale *= dollyScale
  		} else if (scope.object.isOrthographicCamera) {
  			scope.object.zoom = Math.max(scope.minZoom, Math.min(scope.maxZoom, scope.object.zoom / dollyScale))
  			scope.object.updateProjectionMatrix()
  			zoomChanged = true
  		} else {
  			console.warn('WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.')
  			scope.enableZoom = false
  		}
  	}

  	//
  	// event callbacks - update the object state
  	//

  	function handleMouseDownRotate (event) {
  		// console.log( 'handleMouseDownRotate' );

  		rotateStart.set(event.clientX, event.clientY)
  	}

  	function handleMouseDownDolly (event) {
  		// console.log( 'handleMouseDownDolly' );

  		dollyStart.set(event.clientX, event.clientY)
  	}

  	function handleMouseDownPan (event) {
  		// console.log( 'handleMouseDownPan' );

  		panStart.set(event.clientX, event.clientY)
  	}

  	function handleMouseMoveRotate (event) {
  		// console.log( 'handleMouseMoveRotate' );

  		rotateEnd.set(event.clientX, event.clientY)

  		rotateDelta.subVectors(rotateEnd, rotateStart).multiplyScalar(scope.rotateSpeed)

  		var element = scope.domElement === document ? scope.domElement.body : scope.domElement

  		scope.rotateLeft(2 * Math.PI * rotateDelta.x / element.clientHeight) // yes, height

  		scope.rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight)

  		rotateStart.copy(rotateEnd)

  		scope.update()
  	}

  	function handleMouseMoveDolly (event) {
  		// console.log( 'handleMouseMoveDolly' );

  		dollyEnd.set(event.clientX, event.clientY)

  		dollyDelta.subVectors(dollyEnd, dollyStart)

  		if (dollyDelta.y > 0) {
  			dollyIn(getZoomScale())
  		} else if (dollyDelta.y < 0) {
  			dollyOut(getZoomScale())
  		}

  		dollyStart.copy(dollyEnd)

  		scope.update()
  	}

  	function handleMouseMovePan (event) {
  		// console.log( 'handleMouseMovePan' );

  		panEnd.set(event.clientX, event.clientY)

  		panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed)

  		pan(panDelta.x, panDelta.y)

  		panStart.copy(panEnd)

  		scope.update()
  	}

  	function handleMouseWheel (event) {
  		// console.log( 'handleMouseWheel' );

  		if (event.deltaY < 0) {
  			dollyOut(getZoomScale())
  		} else if (event.deltaY > 0) {
  			dollyIn(getZoomScale())
  		}

  		scope.update()
  	}

  	function handleKeyDown (event) {
  		// console.log( 'handleKeyDown' );

  		switch (event.keyCode) {
  			case scope.keys.UP:
  				pan(0, scope.keyPanSpeed)
  				scope.update()
  				break

  			case scope.keys.BOTTOM:
  				pan(0, -scope.keyPanSpeed)
  				scope.update()
  				break

  			case scope.keys.LEFT:
  				pan(scope.keyPanSpeed, 0)
  				scope.update()
  				break

  			case scope.keys.RIGHT:
  				pan(-scope.keyPanSpeed, 0)
  				scope.update()
  				break
  		}
  	}

  	function handleTouchStartRotate (event) {
  		// console.log( 'handleTouchStartRotate' );

  		rotateStart.set(event.touches[0].pageX, event.touches[0].pageY)
  	}

  	function handleTouchStartDollyPan (event) {
  		// console.log( 'handleTouchStartDollyPan' );

  		if (scope.enableZoom) {
  			var dx = event.touches[0].pageX - event.touches[1].pageX
  			var dy = event.touches[0].pageY - event.touches[1].pageY

  			var distance = Math.sqrt(dx * dx + dy * dy)

  			dollyStart.set(0, distance)
  		}

  		if (scope.enablePan) {
  			var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX)
  			var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY)

  			panStart.set(x, y)
  		}
  	}

  	function handleTouchMoveRotate (event) {
  		// console.log( 'handleTouchMoveRotate' );

  		rotateEnd.set(event.touches[0].pageX, event.touches[0].pageY)

  		rotateDelta.subVectors(rotateEnd, rotateStart).multiplyScalar(scope.rotateSpeed)

  		var element = scope.domElement === document ? scope.domElement.body : scope.domElement

  		scope.rotateLeft(2 * Math.PI * rotateDelta.x / element.clientHeight) // yes, height

  		scope.rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight)

  		rotateStart.copy(rotateEnd)

  		scope.update()
  	}

  	function handleTouchMoveDollyPan (event) {
  		// console.log( 'handleTouchMoveDollyPan' );

  		if (scope.enableZoom) {
  			var dx = event.touches[0].pageX - event.touches[1].pageX
  			var dy = event.touches[0].pageY - event.touches[1].pageY

  			var distance = Math.sqrt(dx * dx + dy * dy)

  			dollyEnd.set(0, distance)

  			dollyDelta.set(0, Math.pow(dollyEnd.y / dollyStart.y, scope.zoomSpeed))

  			dollyIn(dollyDelta.y)

  			dollyStart.copy(dollyEnd)
  		}

  		if (scope.enablePan) {
  			var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX)
  			var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY)

  			panEnd.set(x, y)

  			panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed)

  			pan(panDelta.x, panDelta.y)

  			panStart.copy(panEnd)
  		}

  		scope.update()
  	}

  	//
  	// event handlers - FSM: listen for events and reset state
  	//

  	function onMouseDown (event) {
  		if (scope.enabled === false) return

  		event.preventDefault()

  		switch (event.button) {
  			case scope.mouseButtons.ORBIT:

  				if (scope.enableRotate === false) return

  				handleMouseDownRotate(event)

  				state = STATE.ROTATE

  				break

  			case scope.mouseButtons.ZOOM:

  				if (scope.enableZoom === false) return

  				handleMouseDownDolly(event)

  				state = STATE.DOLLY

  				break

  			case scope.mouseButtons.PAN:

  				if (scope.enablePan === false) return

  				handleMouseDownPan(event)

  				state = STATE.PAN

  				break
  		}

  		if (state !== STATE.NONE) {
  			document.addEventListener('mousemove', onMouseMove, false)
  			document.addEventListener('mouseup', onMouseUp, false)

  			scope.dispatchEvent(startEvent)
  		}
  	}

  	function onMouseMove (event) {
  		if (scope.enabled === false) return

  		event.preventDefault()

  		switch (state) {
  			case STATE.ROTATE:

  				if (scope.enableRotate === false) return

  				handleMouseMoveRotate(event)

  				break

  			case STATE.DOLLY:

  				if (scope.enableZoom === false) return

  				handleMouseMoveDolly(event)

  				break

  			case STATE.PAN:

  				if (scope.enablePan === false) return

  				handleMouseMovePan(event)

  				break
  		}
  	}

  	function onMouseUp (event) {
  		if (scope.enabled === false) return

  		document.removeEventListener('mousemove', onMouseMove, false)
  		document.removeEventListener('mouseup', onMouseUp, false)

  		scope.dispatchEvent(endEvent)

  		state = STATE.NONE
  	}

  	function onMouseWheel (event) {
  		if (scope.enabled === false || scope.enableZoom === false || (state !== STATE.NONE && state !== STATE.ROTATE)) return

  		event.preventDefault()
  		event.stopPropagation()

  		scope.dispatchEvent(startEvent)

  		handleMouseWheel(event)

  		scope.dispatchEvent(endEvent)
  	}

  	function onKeyDown (event) {
  		if (scope.enabled === false || scope.enableKeys === false || scope.enablePan === false) return

  		handleKeyDown(event)
  	}

  	function onTouchStart (event) {
  		if (scope.enabled === false) return

  		event.preventDefault()

  		switch (event.touches.length) {
  			case 1:	// one-fingered touch: rotate

  				if (scope.enableRotate === false) return

  				handleTouchStartRotate(event)

  				state = STATE.TOUCH_ROTATE

  				break

  			case 2:	// two-fingered touch: dolly-pan

  				if (scope.enableZoom === false && scope.enablePan === false) return

  				handleTouchStartDollyPan(event)

  				state = STATE.TOUCH_DOLLY_PAN

  				break

  			default:

  				state = STATE.NONE
  		}

  		if (state !== STATE.NONE) {
  			scope.dispatchEvent(startEvent)
  		}
  	}

  	function onTouchMove (event) {
  		if (scope.enabled === false) return

  		event.preventDefault()
  		event.stopPropagation()

  		switch (event.touches.length) {
  			case 1: // one-fingered touch: rotate

  				if (scope.enableRotate === false) return
  				if (state !== STATE.TOUCH_ROTATE) return // is this needed?

  				handleTouchMoveRotate(event)

  				break

  			case 2: // two-fingered touch: dolly-pan

  				if (scope.enableZoom === false && scope.enablePan === false) return
  				if (state !== STATE.TOUCH_DOLLY_PAN) return // is this needed?

  				handleTouchMoveDollyPan(event)

  				break

  			default:

  				state = STATE.NONE
  		}
  	}

  	function onTouchEnd (event) {
  		if (scope.enabled === false) return

  		scope.dispatchEvent(endEvent)

  		state = STATE.NONE
  	}

  	function onContextMenu (event) {
  		if (scope.enabled === false) return

  		event.preventDefault()
  	}

  	//

  	// scope.domElement.addEventListener\( 'contextmenu', onContextMenu, false );

  	scope.domElement.addEventListener('mousedown', onMouseDown, false)
  	scope.domElement.addEventListener('wheel', onMouseWheel, false)

  	scope.domElement.addEventListener('touchstart', onTouchStart, false)
  	scope.domElement.addEventListener('touchend', onTouchEnd, false)
  	scope.domElement.addEventListener('touchmove', onTouchMove, false)

  	window.addEventListener('keydown', onKeyDown, false)

  	// force an update at start

  	this.update()
  }

  OrbitControls.prototype = Object.create(EventDispatcher.prototype)
  OrbitControls.prototype.constructor = OrbitControls

  Object.defineProperties(OrbitControls.prototype, {

  	center: {

  		get: function () {
  			console.warn('OrbitControls: .center has been renamed to .target')
  			return this.target
  		}

  	},

  	// backward compatibility

  	noZoom: {

  		get: function () {
  			console.warn('OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.')
  			return !this.enableZoom
  		},

  		set: function (value) {
  			console.warn('OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.')
  			this.enableZoom = !value
  		}

  	},

  	noRotate: {

  		get: function () {
  			console.warn('OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.')
  			return !this.enableRotate
  		},

  		set: function (value) {
  			console.warn('OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.')
  			this.enableRotate = !value
  		}

  	},

  	noPan: {

  		get: function () {
  			console.warn('OrbitControls: .noPan has been deprecated. Use .enablePan instead.')
  			return !this.enablePan
  		},

  		set: function (value) {
  			console.warn('OrbitControls: .noPan has been deprecated. Use .enablePan instead.')
  			this.enablePan = !value
  		}

  	},

  	noKeys: {

  		get: function () {
  			console.warn('OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.')
  			return !this.enableKeys
  		},

  		set: function (value) {
  			console.warn('OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.')
  			this.enableKeys = !value
  		}

  	},

  	staticMoving: {

  		get: function () {
  			console.warn('OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.')
  			return !this.enableDamping
  		},

  		set: function (value) {
  			console.warn('OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.')
  			this.enableDamping = !value
  		}

  	},

  	dynamicDampingFactor: {

  		get: function () {
  			console.warn('OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.')
  			return this.dampingFactor
  		},

  		set: function (value) {
  			console.warn('OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.')
  			this.dampingFactor = value
  		}

  	}

  })

  /**
   * @author richt / http://richt.me
   * @author WestLangley / http://github.com/WestLangley
   *
   * W3C Device Orientation control (http://w3c.github.io/deviceorientation/spec-source-orientation.html)
   */
  var DeviceOrientationControls = function (object) {
  	var scope = this

  	this.object = object
  	this.object.rotation.reorder('YXZ')

  	this.enabled = true

  	this.deviceOrientation = {}
  	this.screenOrientation = 0

  	this.alphaOffset = 0 // radians

  	var onDeviceOrientationChangeEvent = function (event) {
  		scope.deviceOrientation = event
  	}

  	var onScreenOrientationChangeEvent = function () {
  		scope.screenOrientation = window.orientation || 0
  	}

  	// The angles alpha, beta and gamma form a set of intrinsic Tait-Bryan angles of type Z-X'-Y''

  	var setObjectQuaternion = (function () {
  		var zee = new Vector3(0, 0, 1)

  		var euler = new Euler()

  		var q0 = new Quaternion()

  		var q1 = new Quaternion(-Math.sqrt(0.5), 0, 0, Math.sqrt(0.5)) // - PI/2 around the x-axis

  		return function (quaternion, alpha, beta, gamma, orient) {
  			euler.set(beta, alpha, -gamma, 'YXZ') // 'ZXY' for the device, but 'YXZ' for us

  			quaternion.setFromEuler(euler) // orient the device

  			quaternion.multiply(q1) // camera looks out the back of the device, not the top

  			quaternion.multiply(q0.setFromAxisAngle(zee, -orient)) // adjust for screen orientation
  		}
  	}())

  	this.connect = function () {
  		onScreenOrientationChangeEvent() // run once on load

  		window.addEventListener('orientationchange', onScreenOrientationChangeEvent, false)
  		window.addEventListener('deviceorientation', onDeviceOrientationChangeEvent, false)

  		scope.enabled = true
  	}

  	this.disconnect = function () {
  		window.removeEventListener('orientationchange', onScreenOrientationChangeEvent, false)
  		window.removeEventListener('deviceorientation', onDeviceOrientationChangeEvent, false)

  		scope.enabled = false
  	}

  	this.update = function () {
  		if (scope.enabled === false) return

  		var device = scope.deviceOrientation

  		if (device) {
  			var alpha = device.alpha ? _Math.degToRad(device.alpha) + scope.alphaOffset : 0 // Z

  			var beta = device.beta ? _Math.degToRad(device.beta) : 0 // X'

  			var gamma = device.gamma ? _Math.degToRad(device.gamma) : 0 // Y''

  			var orient = scope.screenOrientation ? _Math.degToRad(scope.screenOrientation) : 0 // O

  			setObjectQuaternion(scope.object.quaternion, alpha, beta, gamma, orient)
  		}
  	}

  	this.dispose = function () {
  		scope.disconnect()
  	}

  	this.connect()
  }

  /**
   * Convert a quaternion to an angle
   *
   * Taken from https://stackoverflow.com/a/35448946
   * Thanks P. Ellul
   */

  function Quat2Angle (x, y, z, w) {
    var test = x * y + z * w // singularity at north pole

    if (test > 0.499) {
      var _yaw = 2 * Math.atan2(x, w)

      var _pitch = Math.PI / 2

      var _roll = 0
      return new Vector3(_pitch, _roll, _yaw)
    } // singularity at south pole

    if (test < -0.499) {
      var _yaw2 = -2 * Math.atan2(x, w)

      var _pitch2 = -Math.PI / 2

      var _roll2 = 0
      return new Vector3(_pitch2, _roll2, _yaw2)
    }

    var sqx = x * x
    var sqy = y * y
    var sqz = z * z
    var yaw = Math.atan2(2 * y * w - 2 * x * z, 1 - 2 * sqy - 2 * sqz)
    var pitch = Math.asin(2 * test)
    var roll = Math.atan2(2 * x * w - 2 * y * z, 1 - 2 * sqx - 2 * sqz)
    return new Vector3(pitch, roll, yaw)
  }

  var OrbitOrientationControls =
  /* #__PURE__ */
  (function () {
    function OrbitOrientationControls (options) {
      this.object = options.camera
      this.domElement = options.canvas
      this.orbit = new OrbitControls(this.object, this.domElement)
      this.speed = 0.5
      this.orbit.target.set(0, 0, -1)
      this.orbit.enableZoom = false
      this.orbit.enablePan = false
      this.orbit.rotateSpeed = -this.speed // if orientation is supported

      if (options.orientation) {
        this.orientation = new DeviceOrientationControls(this.object)
      } // if projection is not full view
      // limit the rotation angle in order to not display back half view

      if (options.halfView) {
        this.orbit.minAzimuthAngle = -Math.PI / 4
        this.orbit.maxAzimuthAngle = Math.PI / 4
      }
    }

    var _proto = OrbitOrientationControls.prototype

    _proto.update = function update () {
      // orientation updates the camera using quaternions and
      // orbit updates the camera using angles. They are incompatible
      // and one update overrides the other. So before
      // orbit overrides orientation we convert our quaternion changes to
      // an angle change. Then save the angle into orbit so that
      // it will take those into account when it updates the camera and overrides
      // our changes
      if (this.orientation) {
        this.orientation.update()
        var quat = this.orientation.object.quaternion
        var currentAngle = Quat2Angle(quat.x, quat.y, quat.z, quat.w) // we also have to store the last angle since quaternions are b

        if (typeof this.lastAngle_ === 'undefined') {
          this.lastAngle_ = currentAngle
        }

        this.orbit.rotateLeft((this.lastAngle_.z - currentAngle.z) * (1 + this.speed))
        this.orbit.rotateUp((this.lastAngle_.y - currentAngle.y) * (1 + this.speed))
        this.lastAngle_ = currentAngle
      }

      this.orbit.update()
    }

    _proto.dispose = function dispose () {
      this.orbit.dispose()

      if (this.orientation) {
        this.orientation.dispose()
      }
    }

    return OrbitOrientationControls
  }())

  var corsSupport = (function () {
    var video = document$1.createElement('video')
    video.crossOrigin = 'anonymous'
    return video.hasAttribute('crossorigin')
  }())
  var validProjections = ['360', '360_LR', '360_TB', '360_CUBE', 'EAC', 'EAC_LR', 'NONE', 'AUTO', 'Sphere', 'Cube', 'equirectangular', '180']
  var getInternalProjectionName = function getInternalProjectionName (projection) {
    if (!projection) {
      return
    }

    projection = projection.toString().trim()

    if (/sphere/i.test(projection)) {
      return '360'
    }

    if (/cube/i.test(projection)) {
      return '360_CUBE'
    }

    if (/equirectangular/i.test(projection)) {
      return '360'
    }

    for (var i = 0; i < validProjections.length; i++) {
      if (new RegExp('^' + validProjections[i] + '$', 'i').test(projection)) {
        return validProjections[i]
      }
    }
  }

  /**
   * This class reacts to interactions with the canvas and
   * triggers appropriate functionality on the player. Right now
   * it does two things:
   *
   * 1. A `mousedown`/`touchstart` followed by `touchend`/`mouseup` without any
   *    `touchmove` or `mousemove` toggles play/pause on the player
   * 2. Only moving on/clicking the control bar or toggling play/pause should
   *    show the control bar. Moving around the scene in the canvas should not.
   */

  var CanvasPlayerControls =
  /* #__PURE__ */
  (function (_videojs$EventTarget) {
    inheritsLoose(CanvasPlayerControls, _videojs$EventTarget)

    function CanvasPlayerControls (player, canvas) {
      var _this

      _this = _videojs$EventTarget.call(this) || this
      _this.player = player
      _this.canvas = canvas
      _this.onMoveEnd = videojs.bind(assertThisInitialized(_this), _this.onMoveEnd)
      _this.onMoveStart = videojs.bind(assertThisInitialized(_this), _this.onMoveStart)
      _this.onMove = videojs.bind(assertThisInitialized(_this), _this.onMove)
      _this.onControlBarMove = videojs.bind(assertThisInitialized(_this), _this.onControlBarMove)

      _this.player.controlBar.on(['mousedown', 'mousemove', 'mouseup', 'touchstart', 'touchmove', 'touchend'], _this.onControlBarMove) // we have to override these here because
      // video.js listens for user activity on the video element
      // and makes the user active when the mouse moves.
      // We don't want that for 3d videos

      _this.oldReportUserActivity = _this.player.reportUserActivity

      _this.player.reportUserActivity = function () {} // canvas movements

      _this.canvas.addEventListener('mousedown', _this.onMoveStart)

      _this.canvas.addEventListener('touchstart', _this.onMoveStart)

      _this.canvas.addEventListener('mousemove', _this.onMove)

      _this.canvas.addEventListener('touchmove', _this.onMove)

      _this.canvas.addEventListener('mouseup', _this.onMoveEnd)

      _this.canvas.addEventListener('touchend', _this.onMoveEnd)

      _this.shouldTogglePlay = false
      return _this
    }

    var _proto = CanvasPlayerControls.prototype

    _proto.togglePlay = function togglePlay () {
      if (this.player.paused()) {
        this.player.play()
      } else {
        this.player.pause()
      }
    }

    _proto.onMoveStart = function onMoveStart (e) {
      // if the player does not have a controlbar or
      // the move was a mouse click but not left click do not
      // toggle play.
      if (!this.player.controls() || e.type === 'mousedown' && !videojs.dom.isSingleLeftClick(e)) {
        this.shouldTogglePlay = false
        return
      }

      this.shouldTogglePlay = true
      this.touchMoveCount_ = 0
    }

    _proto.onMoveEnd = function onMoveEnd (e) {
      // We want to have the same behavior in VR360 Player and standar player.
      // in touchend we want to know if was a touch click, for a click we show the bar,
      // otherwise continue with the mouse logic.
      //
      // Maximum movement allowed during a touch event to still be considered a tap
      // Other popular libs use anywhere from 2 (hammer.js) to 15,
      // so 10 seems like a nice, round number.
      if (e.type === 'touchend' && this.touchMoveCount_ < 10) {
        if (this.player.userActive() === false) {
          this.player.userActive(true)
          return
        }

        this.player.userActive(false)
        return
      }

      if (!this.shouldTogglePlay) {
        return
      } // We want the same behavior in Desktop for VR360  and standar player

      if (e.type == 'mouseup') {
        this.togglePlay()
      }
    }

    _proto.onMove = function onMove (e) {
      // Increase touchMoveCount_ since Android detects 1 - 6 touches when user click normaly
      this.touchMoveCount_++
      this.shouldTogglePlay = false
    }

    _proto.onControlBarMove = function onControlBarMove (e) {
      this.player.userActive(true)
    }

    _proto.dispose = function dispose () {
      this.canvas.removeEventListener('mousedown', this.onMoveStart)
      this.canvas.removeEventListener('touchstart', this.onMoveStart)
      this.canvas.removeEventListener('mousemove', this.onMove)
      this.canvas.removeEventListener('touchmove', this.onMove)
      this.canvas.removeEventListener('mouseup', this.onMoveEnd)
      this.canvas.removeEventListener('touchend', this.onMoveEnd)
      this.player.controlBar.off(['mousedown', 'mousemove', 'mouseup', 'touchstart', 'touchmove', 'touchend'], this.onControlBarMove)
      this.player.reportUserActivity = this.oldReportUserActivity
    }

    return CanvasPlayerControls
  }(videojs.EventTarget))

  /**
   * This class manages ambisonic decoding and binaural rendering via Omnitone library.
   */

  var OmnitoneController =
  /* #__PURE__ */
  (function (_videojs$EventTarget) {
    inheritsLoose(OmnitoneController, _videojs$EventTarget)

    /**
     * Omnitone controller class.
     *
     * @class
     * @param {AudioContext} audioContext - associated AudioContext.
     * @param {Omnitone library} omnitone - Omnitone library element.
     * @param {HTMLVideoElement} video - vidoe tag element.
     * @param {Object} options - omnitone options.
     */
    function OmnitoneController (audioContext, omnitone, video, options) {
      var _this

      _this = _videojs$EventTarget.call(this) || this
      var settings = videojs.mergeOptions({
        // Safari uses the different AAC decoder than FFMPEG. The channel order is
        // The default 4ch AAC channel layout for FFMPEG AAC channel ordering.
        channelMap: videojs.browser.IS_SAFARI ? [2, 0, 1, 3] : [0, 1, 2, 3],
        ambisonicOrder: 1
      }, options)
      _this.videoElementSource = audioContext.createMediaElementSource(video)
      _this.foaRenderer = omnitone.createFOARenderer(audioContext, settings)

      _this.foaRenderer.initialize().then(function () {
        if (audioContext.state === 'suspended') {
          _this.trigger({
            type: 'audiocontext-suspended'
          })
        }

        _this.videoElementSource.connect(_this.foaRenderer.input)

        _this.foaRenderer.output.connect(audioContext.destination)

        _this.initialized = true

        _this.trigger({
          type: 'omnitone-ready'
        })
      }, function (error) {
        videojs.log.warn('videojs-vr: Omnitone initializes failed with the following error: ' + error + ')')
      })

      return _this
    }
    /**
     * Updates the rotation of the Omnitone decoder based on three.js camera matrix.
     *
     * @param {Camera} camera Three.js camera object
     */

    var _proto = OmnitoneController.prototype

    _proto.update = function update (camera) {
      if (!this.initialized) {
        return
      }

      this.foaRenderer.setRotationMatrixFromCamera(camera.matrix)
    }
    /**
     * Destroys the controller and does any necessary cleanup.
     */

    _proto.dispose = function dispose () {
      this.initialized = false
      this.foaRenderer.setRenderingMode('bypass')
      this.foaRenderer = null
    }

    return OmnitoneController
  }(videojs.EventTarget))

  var Button = videojs.getComponent('Button')

  var CardboardButton =
  /* #__PURE__ */
  (function (_Button) {
    inheritsLoose(CardboardButton, _Button)

    function CardboardButton (player, options) {
      var _this

      _this = _Button.call(this, player, options) || this
      _this.handleVrDisplayActivate_ = videojs.bind(assertThisInitialized(_this), _this.handleVrDisplayActivate_)
      _this.handleVrDisplayDeactivate_ = videojs.bind(assertThisInitialized(_this), _this.handleVrDisplayDeactivate_)
      _this.handleVrDisplayPresentChange_ = videojs.bind(assertThisInitialized(_this), _this.handleVrDisplayPresentChange_)
      _this.handleOrientationChange_ = videojs.bind(assertThisInitialized(_this), _this.handleOrientationChange_)
      window$1.addEventListener('orientationchange', _this.handleOrientationChange_)
      window$1.addEventListener('vrdisplayactivate', _this.handleVrDisplayActivate_)
      window$1.addEventListener('vrdisplaydeactivate', _this.handleVrDisplayDeactivate_) // vrdisplaypresentchange does not fire activate or deactivate
      // and happens when hitting the back button during cardboard mode
      // so we need to make sure we stay in the correct state by
      // listening to it and checking if we are presenting it or not

      window$1.addEventListener('vrdisplaypresentchange', _this.handleVrDisplayPresentChange_) // we cannot show the cardboard button in fullscreen on
      // android as it breaks the controls, and makes it impossible
      // to exit cardboard mode

      if (videojs.browser.IS_ANDROID) {
        _this.on(player, 'fullscreenchange', function () {
          if (player.isFullscreen()) {
            _this.hide()
          } else {
            _this.show()
          }
        })
      }

      return _this
    }

    var _proto = CardboardButton.prototype

    _proto.buildCSSClass = function buildCSSClass () {
      return 'vjs-button-vr ' + _Button.prototype.buildCSSClass.call(this)
    }

    _proto.handleVrDisplayPresentChange_ = function handleVrDisplayPresentChange_ () {
      if (!this.player_.vr().vrDisplay.isPresenting && this.active_) {
        this.handleVrDisplayDeactivate_()
      }

      if (this.player_.vr().vrDisplay.isPresenting && !this.active_) {
        this.handleVrDisplayActivate_()
      }
    }

    _proto.handleOrientationChange_ = function handleOrientationChange_ () {
      if (this.active_ && videojs.browser.IS_IOS) {
        this.changeSize_()
      }
    }

    _proto.changeSize_ = function changeSize_ () {
      this.player_.width(window$1.innerWidth)
      this.player_.height(window$1.innerHeight)
      window$1.dispatchEvent(new window$1.Event('resize'))
    }

    _proto.handleVrDisplayActivate_ = function handleVrDisplayActivate_ () {
      // we mimic fullscreen on IOS
      if (videojs.browser.IS_IOS) {
        this.oldWidth_ = this.player_.currentWidth()
        this.oldHeight_ = this.player_.currentHeight()
        this.player_.enterFullWindow()
        this.changeSize_()
      }

      this.active_ = true
    }

    _proto.handleVrDisplayDeactivate_ = function handleVrDisplayDeactivate_ () {
      // un-mimic fullscreen on iOS
      if (videojs.browser.IS_IOS) {
        if (this.oldWidth_) {
          this.player_.width(this.oldWidth_)
        }

        if (this.oldHeight_) {
          this.player_.height(this.oldHeight_)
        }

        this.player_.exitFullWindow()
      }

      this.active_ = false
    }

    _proto.handleClick = function handleClick (event) {
      // if cardboard mode display is not active, activate it
      // otherwise deactivate it
      if (!this.active_) {
        // This starts playback mode when the cardboard button
        // is clicked on Andriod. We need to do this as the controls
        // disappear
        if (!this.player_.hasStarted() && videojs.browser.IS_ANDROID) {
          this.player_.play()
        }

        window$1.dispatchEvent(new window$1.Event('vrdisplayactivate'))
      } else {
        window$1.dispatchEvent(new window$1.Event('vrdisplaydeactivate'))
      }
    }

    _proto.dispose = function dispose () {
      _Button.prototype.dispose.call(this)

      window$1.removeEventListener('vrdisplayactivate', this.handleVrDisplayActivate_)
      window$1.removeEventListener('vrdisplaydeactivate', this.handleVrDisplayDeactivate_)
      window$1.removeEventListener('vrdisplaypresentchange', this.handleVrDisplayPresentChange_)
    }

    return CardboardButton
  }(Button))

  videojs.registerComponent('CardboardButton', CardboardButton)

  var BigPlayButton = videojs.getComponent('BigPlayButton')

  var BigVrPlayButton =
  /* #__PURE__ */
  (function (_BigPlayButton) {
    inheritsLoose(BigVrPlayButton, _BigPlayButton)

    function BigVrPlayButton () {
      return _BigPlayButton.apply(this, arguments) || this
    }

    var _proto = BigVrPlayButton.prototype

    _proto.buildCSSClass = function buildCSSClass () {
      return 'vjs-big-vr-play-button ' + _BigPlayButton.prototype.buildCSSClass.call(this)
    }

    return BigVrPlayButton
  }(BigPlayButton))

  videojs.registerComponent('BigVrPlayButton', BigVrPlayButton)

  var defaults = {
    debug: false,
    omnitone: false,
    forceCardboard: false,
    omnitoneOptions: {},
    projection: 'AUTO'
  }
  var errors = {
    'web-vr-out-of-date': {
      headline: '360 is out of date',
      type: '360_OUT_OF_DATE',
      message: "Your browser supports 360 but not the latest version. See <a href='http://webvr.info'>http://webvr.info</a> for more info."
    },
    'web-vr-not-supported': {
      headline: '360 not supported on this device',
      type: '360_NOT_SUPPORTED',
      message: "Your browser does not support 360. See <a href='http://webvr.info'>http://webvr.info</a> for assistance."
    },
    'web-vr-hls-cors-not-supported': {
      headline: '360 HLS video not supported on this device',
      type: '360_NOT_SUPPORTED',
      message: "Your browser/device does not support HLS 360 video. See <a href='http://webvr.info'>http://webvr.info</a> for assistance."
    }
  }
  var Plugin = videojs.getPlugin('plugin')
  var Component = videojs.getComponent('Component')

  var VR =
  /* #__PURE__ */
  (function (_Plugin) {
    inheritsLoose(VR, _Plugin)

    function VR (player, options) {
      var _this

      var settings = videojs.mergeOptions(defaults, options)
      _this = _Plugin.call(this, player, settings) || this
      _this.options_ = settings
      _this.player_ = player
      _this.bigPlayButtonIndex_ = player.children().indexOf(player.getChild('BigPlayButton')) || 0 // custom videojs-errors integration boolean

      _this.videojsErrorsSupport_ = !!videojs.errors

      if (_this.videojsErrorsSupport_) {
        player.errors({
          errors: errors
        })
      } // IE 11 does not support enough webgl to be supported
      // older safari does not support cors, so it wont work

      if (videojs.browser.IE_VERSION || !corsSupport) {
        // if a player triggers error before 'loadstart' is fired
        // video.js will reset the error overlay
        _this.player_.on('loadstart', function () {
          _this.triggerError_({
            code: 'web-vr-not-supported',
            dismiss: false
          })
        })

        return assertThisInitialized(_this)
      }

      _this.polyfill_ = new WebVRPolyfill({
        // do not show rotate instructions
        ROTATE_INSTRUCTIONS_DISABLED: true
      })
      _this.polyfill_ = new WebVRPolyfill()
      _this.handleVrDisplayActivate_ = videojs.bind(assertThisInitialized(_this), _this.handleVrDisplayActivate_)
      _this.handleVrDisplayDeactivate_ = videojs.bind(assertThisInitialized(_this), _this.handleVrDisplayDeactivate_)
      _this.handleResize_ = videojs.bind(assertThisInitialized(_this), _this.handleResize_)
      _this.animate_ = videojs.bind(assertThisInitialized(_this), _this.animate_)

      _this.setProjection(_this.options_.projection) // any time the video element is recycled for ads
      // we have to reset the vr state and re-init after ad

      _this.on(player, 'adstart', function () {
        return player.setTimeout(function () {
          // if the video element was recycled for this ad
          if (!player.ads || !player.ads.videoElementRecycled()) {
            _this.log('video element not recycled for this ad, no need to reset')

            return
          }

          _this.log('video element recycled for this ad, reseting')

          _this.reset()

          _this.one(player, 'playing', _this.init)
        })
      }, 1)

      _this.on(player, 'loadedmetadata', _this.init)

      return _this
    }

    var _proto = VR.prototype

    _proto.changeProjection_ = function changeProjection_ (projection) {
      var _this2 = this

      projection = getInternalProjectionName(projection) // don't change to an invalid projection

      if (!projection) {
        projection = 'NONE'
      }

      var position = {
        x: 0,
        y: 0,
        z: 0
      }

      if (this.scene) {
        this.scene.remove(this.movieScreen)
      }

      if (projection === 'AUTO') {
        // mediainfo cannot be set to auto or we would infinite loop here
        // each source should know wether they are 360 or not, if using AUTO
        if (this.player_.mediainfo && this.player_.mediainfo.projection && this.player_.mediainfo.projection !== 'AUTO') {
          var autoProjection = getInternalProjectionName(this.player_.mediainfo.projection)
          return this.changeProjection_(autoProjection)
        }

        return this.changeProjection_('NONE')
      } else if (projection === '360') {
        this.movieGeometry = new SphereBufferGeometry(256, 32, 32)
        this.movieMaterial = new MeshBasicMaterial({
          map: this.videoTexture,
          overdraw: true,
          side: BackSide
        })
        this.movieScreen = new Mesh(this.movieGeometry, this.movieMaterial)
        this.movieScreen.position.set(position.x, position.y, position.z)
        this.movieScreen.scale.x = -1
        this.movieScreen.quaternion.setFromAxisAngle({
          x: 0,
          y: 1,
          z: 0
        }, -Math.PI / 2)
        this.scene.add(this.movieScreen)
      } else if (projection === '360_LR' || projection === '360_TB') {
        // Left eye view
        var geometry = new SphereGeometry(256, 32, 32)
        var uvs = geometry.faceVertexUvs[0]

        for (var i = 0; i < uvs.length; i++) {
          for (var j = 0; j < 3; j++) {
            if (projection === '360_LR') {
              uvs[i][j].x *= 0.5
            } else {
              uvs[i][j].y *= 0.5
              uvs[i][j].y += 0.5
            }
          }
        }

        this.movieGeometry = new BufferGeometry().fromGeometry(geometry)
        this.movieMaterial = new MeshBasicMaterial({
          map: this.videoTexture,
          overdraw: true,
          side: BackSide
        })
        this.movieScreen = new Mesh(this.movieGeometry, this.movieMaterial)
        this.movieScreen.scale.x = -1
        this.movieScreen.quaternion.setFromAxisAngle({
          x: 0,
          y: 1,
          z: 0
        }, -Math.PI / 2) // display in left eye only

        this.movieScreen.layers.set(1)
        this.scene.add(this.movieScreen) // Right eye view

        geometry = new SphereGeometry(256, 32, 32)
        uvs = geometry.faceVertexUvs[0]

        for (var _i = 0; _i < uvs.length; _i++) {
          for (var _j = 0; _j < 3; _j++) {
            if (projection === '360_LR') {
              uvs[_i][_j].x *= 0.5
              uvs[_i][_j].x += 0.5
            } else {
              uvs[_i][_j].y *= 0.5
            }
          }
        }

        this.movieGeometry = new BufferGeometry().fromGeometry(geometry)
        this.movieMaterial = new MeshBasicMaterial({
          map: this.videoTexture,
          overdraw: true,
          side: BackSide
        })
        this.movieScreen = new Mesh(this.movieGeometry, this.movieMaterial)
        this.movieScreen.scale.x = -1
        this.movieScreen.quaternion.setFromAxisAngle({
          x: 0,
          y: 1,
          z: 0
        }, -Math.PI / 2) // display in right eye only

        this.movieScreen.layers.set(2)
        this.scene.add(this.movieScreen)
      } else if (projection === '360_CUBE') {
        this.movieGeometry = new BoxGeometry(256, 256, 256)
        this.movieMaterial = new MeshBasicMaterial({
          map: this.videoTexture,
          overdraw: true,
          side: BackSide
        })
        var left = [new Vector2(0, 0.5), new Vector2(0.333, 0.5), new Vector2(0.333, 1), new Vector2(0, 1)]
        var right = [new Vector2(0.333, 0.5), new Vector2(0.666, 0.5), new Vector2(0.666, 1), new Vector2(0.333, 1)]
        var top = [new Vector2(0.666, 0.5), new Vector2(1, 0.5), new Vector2(1, 1), new Vector2(0.666, 1)]
        var bottom = [new Vector2(0, 0), new Vector2(0.333, 0), new Vector2(0.333, 0.5), new Vector2(0, 0.5)]
        var front = [new Vector2(0.333, 0), new Vector2(0.666, 0), new Vector2(0.666, 0.5), new Vector2(0.333, 0.5)]
        var back = [new Vector2(0.666, 0), new Vector2(1, 0), new Vector2(1, 0.5), new Vector2(0.666, 0.5)]
        this.movieGeometry.faceVertexUvs[0] = []
        this.movieGeometry.faceVertexUvs[0][0] = [right[2], right[1], right[3]]
        this.movieGeometry.faceVertexUvs[0][1] = [right[1], right[0], right[3]]
        this.movieGeometry.faceVertexUvs[0][2] = [left[2], left[1], left[3]]
        this.movieGeometry.faceVertexUvs[0][3] = [left[1], left[0], left[3]]
        this.movieGeometry.faceVertexUvs[0][4] = [top[2], top[1], top[3]]
        this.movieGeometry.faceVertexUvs[0][5] = [top[1], top[0], top[3]]
        this.movieGeometry.faceVertexUvs[0][6] = [bottom[2], bottom[1], bottom[3]]
        this.movieGeometry.faceVertexUvs[0][7] = [bottom[1], bottom[0], bottom[3]]
        this.movieGeometry.faceVertexUvs[0][8] = [front[2], front[1], front[3]]
        this.movieGeometry.faceVertexUvs[0][9] = [front[1], front[0], front[3]]
        this.movieGeometry.faceVertexUvs[0][10] = [back[2], back[1], back[3]]
        this.movieGeometry.faceVertexUvs[0][11] = [back[1], back[0], back[3]]
        this.movieScreen = new Mesh(this.movieGeometry, this.movieMaterial)
        this.movieScreen.position.set(position.x, position.y, position.z)
        this.movieScreen.rotation.y = -Math.PI
        this.scene.add(this.movieScreen)
      } else if (projection === '180') {
        var _geometry = new SphereGeometry(256, 32, 32, Math.PI, Math.PI) // Left eye view

        _geometry.scale(-1, 1, 1)

        var _uvs = _geometry.faceVertexUvs[0]

        for (var _i2 = 0; _i2 < _uvs.length; _i2++) {
          for (var _j2 = 0; _j2 < 3; _j2++) {
            _uvs[_i2][_j2].x *= 0.5
          }
        }

        this.movieGeometry = new BufferGeometry().fromGeometry(_geometry)
        this.movieMaterial = new MeshBasicMaterial({
          map: this.videoTexture,
          overdraw: true
        })
        this.movieScreen = new Mesh(this.movieGeometry, this.movieMaterial) // display in left eye only

        this.movieScreen.layers.set(1)
        this.scene.add(this.movieScreen) // Right eye view

        _geometry = new SphereGeometry(256, 32, 32, Math.PI, Math.PI)

        _geometry.scale(-1, 1, 1)

        _uvs = _geometry.faceVertexUvs[0]

        for (var _i3 = 0; _i3 < _uvs.length; _i3++) {
          for (var _j3 = 0; _j3 < 3; _j3++) {
            _uvs[_i3][_j3].x *= 0.5
            _uvs[_i3][_j3].x += 0.5
          }
        }

        this.movieGeometry = new BufferGeometry().fromGeometry(_geometry)
        this.movieMaterial = new MeshBasicMaterial({
          map: this.videoTexture,
          overdraw: true
        })
        this.movieScreen = new Mesh(this.movieGeometry, this.movieMaterial) // display in right eye only

        this.movieScreen.layers.set(2)
        this.scene.add(this.movieScreen)
      } else if (projection === 'EAC' || projection === 'EAC_LR') {
        var makeScreen = function makeScreen (mapMatrix, scaleMatrix) {
          // "Continuity correction?": because of discontinuous faces and aliasing,
          // we truncate the 2-pixel-wide strips on all discontinuous edges,
          var contCorrect = 2
          _this2.movieGeometry = new BoxGeometry(256, 256, 256)
          _this2.movieMaterial = new ShaderMaterial({
            overdraw: true,
            side: BackSide,
            uniforms: {
              mapped: {
                value: _this2.videoTexture
              },
              mapMatrix: {
                value: mapMatrix
              },
              contCorrect: {
                value: contCorrect
              },
              faceWH: {
                value: new Vector2(1 / 3, 1 / 2).applyMatrix3(scaleMatrix)
              },
              vidWH: {
                value: new Vector2(_this2.videoTexture.image.videoWidth, _this2.videoTexture.image.videoHeight).applyMatrix3(scaleMatrix)
              }
            },
            vertexShader: '\nvarying vec2 vUv;\nuniform mat3 mapMatrix;\n\nvoid main() {\n  vUv = (mapMatrix * vec3(uv, 1.)).xy;\n  gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.);\n}',
            fragmentShader: '\nvarying vec2 vUv;\nuniform sampler2D mapped;\nuniform vec2 faceWH;\nuniform vec2 vidWH;\nuniform float contCorrect;\n\nconst float PI = 3.1415926535897932384626433832795;\n\nvoid main() {\n  vec2 corner = vUv - mod(vUv, faceWH) + vec2(0, contCorrect / vidWH.y);\n\n  vec2 faceWHadj = faceWH - vec2(0, contCorrect * 2. / vidWH.y);\n\n  vec2 p = (vUv - corner) / faceWHadj - .5;\n  vec2 q = 2. / PI * atan(2. * p) + .5;\n\n  vec2 eUv = corner + q * faceWHadj;\n\n  gl_FragColor = texture2D(mapped, eUv);\n}'
          })
          var right = [new Vector2(0, 1 / 2), new Vector2(1 / 3, 1 / 2), new Vector2(1 / 3, 1), new Vector2(0, 1)]
          var front = [new Vector2(1 / 3, 1 / 2), new Vector2(2 / 3, 1 / 2), new Vector2(2 / 3, 1), new Vector2(1 / 3, 1)]
          var left = [new Vector2(2 / 3, 1 / 2), new Vector2(1, 1 / 2), new Vector2(1, 1), new Vector2(2 / 3, 1)]
          var bottom = [new Vector2(1 / 3, 0), new Vector2(1 / 3, 1 / 2), new Vector2(0, 1 / 2), new Vector2(0, 0)]
          var back = [new Vector2(1 / 3, 1 / 2), new Vector2(1 / 3, 0), new Vector2(2 / 3, 0), new Vector2(2 / 3, 1 / 2)]
          var top = [new Vector2(1, 0), new Vector2(1, 1 / 2), new Vector2(2 / 3, 1 / 2), new Vector2(2 / 3, 0)]

          for (var _i4 = 0, _arr = [right, front, left, bottom, back, top]; _i4 < _arr.length; _i4++) {
            var face = _arr[_i4]
            var height = _this2.videoTexture.image.videoHeight
            var lowY = 1
            var highY = 0

            for (var _iterator = face, _isArray = Array.isArray(_iterator), _i5 = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator](); ;) {
              var _ref

              if (_isArray) {
                if (_i5 >= _iterator.length) break
                _ref = _iterator[_i5++]
              } else {
                _i5 = _iterator.next()
                if (_i5.done) break
                _ref = _i5.value
              }

              var vector = _ref

              if (vector.y < lowY) {
                lowY = vector.y
              }

              if (vector.y > highY) {
                highY = vector.y
              }
            }

            for (var _iterator2 = face, _isArray2 = Array.isArray(_iterator2), _i6 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator](); ;) {
              var _ref2

              if (_isArray2) {
                if (_i6 >= _iterator2.length) break
                _ref2 = _iterator2[_i6++]
              } else {
                _i6 = _iterator2.next()
                if (_i6.done) break
                _ref2 = _i6.value
              }

              var _vector = _ref2

              if (Math.abs(_vector.y - lowY) < Number.EPSILON) {
                _vector.y += contCorrect / height
              }

              if (Math.abs(_vector.y - highY) < Number.EPSILON) {
                _vector.y -= contCorrect / height
              }

              _vector.x = _vector.x / height * (height - contCorrect * 2) + contCorrect / height
            }
          }

          _this2.movieGeometry.faceVertexUvs[0] = []
          _this2.movieGeometry.faceVertexUvs[0][0] = [right[2], right[1], right[3]]
          _this2.movieGeometry.faceVertexUvs[0][1] = [right[1], right[0], right[3]]
          _this2.movieGeometry.faceVertexUvs[0][2] = [left[2], left[1], left[3]]
          _this2.movieGeometry.faceVertexUvs[0][3] = [left[1], left[0], left[3]]
          _this2.movieGeometry.faceVertexUvs[0][4] = [top[2], top[1], top[3]]
          _this2.movieGeometry.faceVertexUvs[0][5] = [top[1], top[0], top[3]]
          _this2.movieGeometry.faceVertexUvs[0][6] = [bottom[2], bottom[1], bottom[3]]
          _this2.movieGeometry.faceVertexUvs[0][7] = [bottom[1], bottom[0], bottom[3]]
          _this2.movieGeometry.faceVertexUvs[0][8] = [front[2], front[1], front[3]]
          _this2.movieGeometry.faceVertexUvs[0][9] = [front[1], front[0], front[3]]
          _this2.movieGeometry.faceVertexUvs[0][10] = [back[2], back[1], back[3]]
          _this2.movieGeometry.faceVertexUvs[0][11] = [back[1], back[0], back[3]]
          _this2.movieScreen = new Mesh(_this2.movieGeometry, _this2.movieMaterial)

          _this2.movieScreen.position.set(position.x, position.y, position.z)

          _this2.movieScreen.rotation.y = -Math.PI
          return _this2.movieScreen
        }

        if (projection === 'EAC') {
          this.scene.add(makeScreen(new Matrix3(), new Matrix3()))
        } else {
          var scaleMatrix = new Matrix3().set(0, 0.5, 0, 1, 0, 0, 0, 0, 1)
          makeScreen(new Matrix3().set(0, -0.5, 0.5, 1, 0, 0, 0, 0, 1), scaleMatrix) // display in left eye only

          this.movieScreen.layers.set(1)
          this.scene.add(this.movieScreen)
          makeScreen(new Matrix3().set(0, -0.5, 1, 1, 0, 0, 0, 0, 1), scaleMatrix) // display in right eye only

          this.movieScreen.layers.set(2)
          this.scene.add(this.movieScreen)
        }
      }

      this.currentProjection_ = projection
    }

    _proto.triggerError_ = function triggerError_ (errorObj) {
      // if we have videojs-errors use it
      if (this.videojsErrorsSupport_) {
        this.player_.error(errorObj) // if we don't have videojs-errors just use a normal player error
      } else {
        // strip any html content from the error message
        // as it is not supported outside of videojs-errors
        var div = document$1.createElement('div')
        div.innerHTML = errors[errorObj.code].message
        var message = div.textContent || div.innerText || ''
        this.player_.error({
          code: errorObj.code,
          message: message
        })
      }
    }

    _proto.log = function log () {
      if (!this.options_.debug) {
        return
      }

      for (var _len = arguments.length, msgs = new Array(_len), _key = 0; _key < _len; _key++) {
        msgs[_key] = arguments[_key]
      }

      msgs.forEach(function (msg) {
        videojs.log('VR: ', msg)
      })
    }

    _proto.handleVrDisplayActivate_ = function handleVrDisplayActivate_ () {
      var _this3 = this

      if (!this.vrDisplay) {
        return
      }

      this.vrDisplay.requestPresent([{
        source: this.renderedCanvas
      }]).then(function () {
        if (!_this3.vrDisplay.cardboardUI_ || !videojs.browser.IS_IOS) {
          return
        } // webvr-polyfill/cardboard ui only watches for click events
        // to tell that the back arrow button is pressed during cardboard vr.
        // but somewhere along the line these events are silenced with preventDefault
        // but only on iOS, so we translate them ourselves here

        var touches = []

        var iosCardboardTouchStart_ = function iosCardboardTouchStart_ (e) {
          for (var i = 0; i < e.touches.length; i++) {
            touches.push(e.touches[i])
          }
        }

        var iosCardboardTouchEnd_ = function iosCardboardTouchEnd_ (e) {
          if (!touches.length) {
            return
          }

          touches.forEach(function (t) {
            var simulatedClick = new window$1.MouseEvent('click', {
              screenX: t.screenX,
              screenY: t.screenY,
              clientX: t.clientX,
              clientY: t.clientY
            })

            _this3.renderedCanvas.dispatchEvent(simulatedClick)
          })
          touches = []
        }

        _this3.renderedCanvas.addEventListener('touchstart', iosCardboardTouchStart_)

        _this3.renderedCanvas.addEventListener('touchend', iosCardboardTouchEnd_)

        _this3.iosRevertTouchToClick_ = function () {
          _this3.renderedCanvas.removeEventListener('touchstart', iosCardboardTouchStart_)

          _this3.renderedCanvas.removeEventListener('touchend', iosCardboardTouchEnd_)

          _this3.iosRevertTouchToClick_ = null
        }
      })
    }

    _proto.handleVrDisplayDeactivate_ = function handleVrDisplayDeactivate_ () {
      if (!this.vrDisplay || !this.vrDisplay.isPresenting) {
        return
      }

      if (this.iosRevertTouchToClick_) {
        this.iosRevertTouchToClick_()
      }

      this.vrDisplay.exitPresent()
    }

    _proto.requestAnimationFrame = function requestAnimationFrame (fn) {
      if (this.vrDisplay) {
        return this.vrDisplay.requestAnimationFrame(fn)
      }

      return this.player_.requestAnimationFrame(fn)
    }

    _proto.cancelAnimationFrame = function cancelAnimationFrame (id) {
      if (this.vrDisplay) {
        return this.vrDisplay.cancelAnimationFrame(id)
      }

      return this.player_.cancelAnimationFrame(id)
    }

    _proto.togglePlay_ = function togglePlay_ () {
      if (this.player_.paused()) {
        this.player_.play()
      } else {
        this.player_.pause()
      }
    }

    _proto.animate_ = function animate_ () {
      if (!this.initialized_) {
        return
      }

      if (this.getVideoEl_().readyState === this.getVideoEl_().HAVE_ENOUGH_DATA) {
        if (this.videoTexture) {
          this.videoTexture.needsUpdate = true
        }
      }

      this.controls3d.update()

      if (this.omniController) {
        this.omniController.update(this.camera)
      }

      this.effect.render(this.scene, this.camera)

      if (window$1.navigator.getGamepads) {
        // Grab all gamepads
        var gamepads = window$1.navigator.getGamepads()

        for (var i = 0; i < gamepads.length; ++i) {
          var gamepad = gamepads[i] // Make sure gamepad is defined
          // Only take input if state has changed since we checked last

          if (!gamepad || !gamepad.timestamp || gamepad.timestamp === this.prevTimestamps_[i]) {
            continue
          }

          for (var j = 0; j < gamepad.buttons.length; ++j) {
            if (gamepad.buttons[j].pressed) {
              this.togglePlay_()
              this.prevTimestamps_[i] = gamepad.timestamp
              break
            }
          }
        }
      }

      this.camera.getWorldDirection(this.cameraVector)
      this.animationFrameId_ = this.requestAnimationFrame(this.animate_)
    }

    _proto.handleResize_ = function handleResize_ () {
      var width = this.player_.currentWidth()
      var height = this.player_.currentHeight()
      this.effect.setSize(width, height, false)
      this.camera.aspect = width / height
      this.camera.updateProjectionMatrix()
    }

    _proto.setProjection = function setProjection (projection) {
      if (!getInternalProjectionName(projection)) {
        videojs.log.error('videojs-vr: please pass a valid projection ' + validProjections.join(', '))
        return
      }

      this.currentProjection_ = projection
      this.defaultProjection_ = projection
    }

    _proto.init = function init () {
      var _this4 = this

      this.reset()
      this.camera = new PerspectiveCamera(75, this.player_.currentWidth() / this.player_.currentHeight(), 1, 1000) // Store vector representing the direction in which the camera is looking, in world space.

      this.cameraVector = new Vector3()

      if (this.currentProjection_ === '360_LR' || this.currentProjection_ === '360_TB' || this.currentProjection_ === '180' || this.currentProjection_ === 'EAC_LR') {
        // Render left eye when not in VR mode
        this.camera.layers.enable(1)
      }

      this.scene = new Scene()
      this.videoTexture = new VideoTexture(this.getVideoEl_()) // shared regardless of wether VideoTexture is used or
      // an image canvas is used

      this.videoTexture.generateMipmaps = false
      this.videoTexture.minFilter = LinearFilter
      this.videoTexture.magFilter = LinearFilter
      this.videoTexture.format = RGBFormat
      this.changeProjection_(this.currentProjection_)

      if (this.currentProjection_ === 'NONE') {
        this.log('Projection is NONE, dont init')
        this.reset()
        return
      }

      this.player_.removeChild('BigPlayButton')
      this.player_.addChild('BigVrPlayButton', {}, this.bigPlayButtonIndex_)
      this.player_.bigPlayButton = this.player_.getChild('BigVrPlayButton') // mobile devices, or cardboard forced to on

      if (this.options_.forceCardboard || videojs.browser.IS_ANDROID || videojs.browser.IS_IOS) {
        this.addCardboardButton_()
      } // if ios remove full screen toggle

      if (videojs.browser.IS_IOS) {
        this.player_.controlBar.fullscreenToggle.hide()
      }

      this.camera.position.set(0, 0, 0)
      this.renderer = new WebGLRenderer({
        devicePixelRatio: window$1.devicePixelRatio,
        alpha: false,
        clearColor: 0xffffff,
        antialias: true
      })
      var webglContext = this.renderer.getContext('webgl')
      var oldTexImage2D = webglContext.texImage2D
      /* this is a workaround since threejs uses try catch */

      webglContext.texImage2D = function () {
        try {
          for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
            args[_key2] = arguments[_key2]
          }

          return oldTexImage2D.apply(webglContext, args)
        } catch (e) {
          _this4.reset()

          _this4.player_.pause()

          _this4.triggerError_({
            code: 'web-vr-hls-cors-not-supported',
            dismiss: false
          })

          throw new Error(e)
        }
      }

      this.renderer.setSize(this.player_.currentWidth(), this.player_.currentHeight(), false)
      this.effect = new VREffect(this.renderer)
      this.effect.setSize(this.player_.currentWidth(), this.player_.currentHeight(), false)
      this.vrDisplay = null // Previous timestamps for gamepad updates
      console.log(this.renderer.domElement)
      this.prevTimestamps_ = []
      this.renderedCanvas = this.renderer.domElement

      this.renderedCanvas.setAttribute('style', 'width: 100%; height: 100%; position: absolute; top:0;')
      var videoElStyle = this.getVideoEl_().style
      this.player_.el().insertBefore(this.renderedCanvas, this.player_.el().firstChild)
      videoElStyle.zIndex = '-1'
      videoElStyle.opacity = '0'

      if (window$1.navigator.getVRDisplays) {
        this.log('is supported, getting vr displays')
        window$1.navigator.getVRDisplays().then(function (displays) {
          if (displays.length > 0) {
            _this4.log('Displays found', displays)

            _this4.vrDisplay = displays[0] // Native WebVR Head Mounted Displays (HMDs) like the HTC Vive
            // also need the cardboard button to enter fully immersive mode
            // so, we want to add the button if we're not polyfilled.

            if (!_this4.vrDisplay.isPolyfilled) {
              _this4.log('Real HMD found using VRControls', _this4.vrDisplay)

              _this4.addCardboardButton_() // We use VRControls here since we are working with an HMD
              // and we only want orientation controls.

              _this4.controls3d = new VRControls(_this4.camera)
            }
          }

          if (!_this4.controls3d) {
            _this4.log('no HMD found Using Orbit & Orientation Controls')

            var options = {
              camera: _this4.camera,
              canvas: _this4.renderedCanvas,
              // check if its a half sphere view projection
              halfView: _this4.currentProjection_ === '180',
              orientation: videojs.browser.IS_IOS || videojs.browser.IS_ANDROID || false
            }

            if (_this4.options_.motionControls === false) {
              options.orientation = false
            }

            _this4.controls3d = new OrbitOrientationControls(options)
            _this4.canvasPlayerControls = new CanvasPlayerControls(_this4.player_, _this4.renderedCanvas)
          }

          _this4.animationFrameId_ = _this4.requestAnimationFrame(_this4.animate_)
        })
      } else if (window$1.navigator.getVRDevices) {
        this.triggerError_({
          code: 'web-vr-out-of-date',
          dismiss: false
        })
      } else {
        this.triggerError_({
          code: 'web-vr-not-supported',
          dismiss: false
        })
      }

      if (this.options_.omnitone) {
        var audiocontext = AudioContext.getContext()
        this.omniController = new OmnitoneController(audiocontext, this.options_.omnitone, this.getVideoEl_(), this.options_.omnitoneOptions)
        this.omniController.one('audiocontext-suspended', function () {
          _this4.player.pause()

          _this4.player.one('playing', function () {
            audiocontext.resume()
          })
        })
      }

      this.on(this.player_, 'fullscreenchange', this.handleResize_)
      window$1.addEventListener('vrdisplaypresentchange', this.handleResize_, true)
      window$1.addEventListener('resize', this.handleResize_, true)
      window$1.addEventListener('vrdisplayactivate', this.handleVrDisplayActivate_, true)
      window$1.addEventListener('vrdisplaydeactivate', this.handleVrDisplayDeactivate_, true)
      this.initialized_ = true
      this.trigger('initialized')
    }

    _proto.addCardboardButton_ = function addCardboardButton_ () {
      if (!this.player_.controlBar.getChild('CardboardButton')) {
        this.player_.controlBar.addChild('CardboardButton', {})
      }
    }

    _proto.getVideoEl_ = function getVideoEl_ () {
      return this.player_.el().getElementsByTagName('video')[0]
    }

    _proto.reset = function reset () {
      if (!this.initialized_) {
        return
      }

      if (this.omniController) {
        this.omniController.off('audiocontext-suspended')
        this.omniController.dispose()
        this.omniController = undefined
      }

      if (this.controls3d) {
        this.controls3d.dispose()
        this.controls3d = null
      }

      if (this.canvasPlayerControls) {
        this.canvasPlayerControls.dispose()
        this.canvasPlayerControls = null
      }

      if (this.effect) {
        this.effect.dispose()
        this.effect = null
      }

      window$1.removeEventListener('resize', this.handleResize_, true)
      window$1.removeEventListener('vrdisplaypresentchange', this.handleResize_, true)
      window$1.removeEventListener('vrdisplayactivate', this.handleVrDisplayActivate_, true)
      window$1.removeEventListener('vrdisplaydeactivate', this.handleVrDisplayDeactivate_, true) // re-add the big play button to player

      if (!this.player_.getChild('BigPlayButton')) {
        this.player_.addChild('BigPlayButton', {}, this.bigPlayButtonIndex_)
      }

      if (this.player_.getChild('BigVrPlayButton')) {
        this.player_.removeChild('BigVrPlayButton')
      } // remove the cardboard button

      if (this.player_.getChild('CardboardButton')) {
        this.player_.controlBar.removeChild('CardboardButton')
      } // show the fullscreen again

      if (videojs.browser.IS_IOS) {
        this.player_.controlBar.fullscreenToggle.show()
      } // reset the video element style so that it will be displayed

      var videoElStyle = this.getVideoEl_().style
      videoElStyle.zIndex = ''
      videoElStyle.opacity = '' // set the current projection to the default

      this.currentProjection_ = this.defaultProjection_ // reset the ios touch to click workaround

      if (this.iosRevertTouchToClick_) {
        this.iosRevertTouchToClick_()
      } // remove the old canvas

      if (this.renderedCanvas) {
        this.renderedCanvas.parentNode.removeChild(this.renderedCanvas)
      }

      if (this.animationFrameId_) {
        this.cancelAnimationFrame(this.animationFrameId_)
      }

      this.initialized_ = false
    }

    _proto.dispose = function dispose () {
      _Plugin.prototype.dispose.call(this)

      this.reset()
    }

    _proto.polyfillVersion = function polyfillVersion () {
      return WebVRPolyfill.version
    }

    return VR
  }(Plugin))

  VR.prototype.setTimeout = Component.prototype.setTimeout
  VR.prototype.clearTimeout = Component.prototype.clearTimeout
  VR.VERSION = version
  videojs.registerPlugin('vr', VR)

  return VR
}))