75 lines
2.8 KiB
Plaintext
75 lines
2.8 KiB
Plaintext
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/* -*-c++-*- */
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/* osgEarth - Geospatial SDK for OpenSceneGraph
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* Copyright 2020 Pelican Mapping
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* http://osgearth.org
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*
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* osgEarth is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef OSGEARTHSYMBOLOGY_MESH_SUBDIVIDER
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#define OSGEARTHSYMBOLOGY_MESH_SUBDIVIDER
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#include <osgEarth/Common>
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#include <osgEarth/GeoMath>
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#include <osg/Geometry>
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#include <osg/PrimitiveSet>
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namespace osgEarth
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{
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/**
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* Recursively subdivides (tesselates) a geocentric geometry mesh to the specified
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* granularity. This class will densify a geocentric primitive to more accurately
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* conform to the ellipsoidal surface of the earth, for example.
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*/
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class OSGEARTH_EXPORT MeshSubdivider
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{
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public:
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/**
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* Construct a new subdivider.
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* Optionally, provide localizer/delocalizer transforms that will take
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* vertex locations in and out of world geocentric coordinates.
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*/
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MeshSubdivider(
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const osg::Matrixd& world2local =osg::Matrixd::identity(),
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const osg::Matrixd& local2world =osg::Matrixd::identity() );
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/**
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* Sets the maximum number elements in each generated primitive set.
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*/
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void setMaxElementsPerEBO( unsigned int value ) {
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_maxElementsPerEBO = value; }
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/**
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* Subdivides an OSG geometry's primitives to the specified granularity.
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* Granularity is an angle, specified in radians - it is the maximum
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* allowable angle between two points in a triangle.
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*
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* This method will also coalesce all the polygonal primitive sets in the geometry
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* into a single GL_TRIANGLES primitive.
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*
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* Note! This utility currently does nothing with repsect to the geometry's
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* color or texture attributes, so it is best used prior to setting those.
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*/
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void run(
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osg::Geometry& geom,
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double granurality_radians,
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GeoInterpolation interp =GEOINTERP_RHUMB_LINE );
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protected:
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osg::Matrixd _local2world, _world2local;
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unsigned int _maxElementsPerEBO;
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};
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} // namespace osgEarth
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#endif // OSGEARTHSYMBOLOGY_MESH_SUBDIVIDER
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