/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSGUTIL_INTERSECTVISITOR
#define OSGUTIL_INTERSECTVISITOR 1
#include <osg/NodeVisitor>
#include <osg/LineSegment>
#include <osg/Geode>
#include <osg/Matrix>
#include <osg/Transform>
#include <osgUtil/Export>
#include <map>
#include <set>
#include <vector>
namespace osgUtil {
/** Deprecated */
class OSGUTIL_EXPORT Hit
{
public:
Hit();
Hit(const Hit& hit);
~Hit();
Hit& operator = (const Hit& hit);
typedef std::vector<int> VecIndexList;
bool operator < (const Hit& hit) const
{
if (_originalLineSegment<hit._originalLineSegment) return true;
if (hit._originalLineSegment<_originalLineSegment) return false;
return _ratio<hit._ratio;
}
const osg::Vec3& getLocalIntersectPoint() const { return _intersectPoint; }
const osg::Vec3& getLocalIntersectNormal() const { return _intersectNormal; }
const osg::Vec3 getWorldIntersectPoint() const { if (_matrix.valid()) return _intersectPoint*(*_matrix); else return _intersectPoint; }
const osg::Vec3 getWorldIntersectNormal() const ;
float getRatio() const { return _ratio; }
const osg::LineSegment* getOriginalLineSegment() const { return _originalLineSegment.get(); }
const osg::LineSegment* getLocalLineSegment() const { return _localLineSegment.get(); }
osg::NodePath& getNodePath() { return _nodePath; }
const osg::NodePath& getNodePath() const { return _nodePath; }
osg::Geode* getGeode() { return _geode.get(); }
const osg::Geode* getGeode() const { return _geode.get(); }
osg::Drawable* getDrawable() { return _drawable.get(); }
const osg::Drawable* getDrawable() const { return _drawable.get(); }
const osg::RefMatrix* getMatrix() const { return _matrix.get(); }
const osg::RefMatrix* getInverseMatrix() const { return _inverse.get(); }
const VecIndexList& getVecIndexList() const { return _vecIndexList; }
int getPrimitiveIndex() const { return _primitiveIndex; }
float _ratio;
osg::ref_ptr<osg::LineSegment> _originalLineSegment;
osg::ref_ptr<osg::LineSegment> _localLineSegment;
osg::NodePath _nodePath;
osg::ref_ptr<osg::Geode> _geode;
osg::ref_ptr<osg::Drawable> _drawable;
osg::ref_ptr<osg::RefMatrix> _matrix;
osg::ref_ptr<osg::RefMatrix> _inverse;
VecIndexList _vecIndexList;
int _primitiveIndex;
osg::Vec3 _intersectPoint;
osg::Vec3 _intersectNormal;
};
/** Deprecated - use IntersectionVisitor instead.*/
class OSGUTIL_EXPORT IntersectVisitor : public osg::NodeVisitor
{
public:
IntersectVisitor();
virtual ~IntersectVisitor();
META_NodeVisitor(osgUtil, IntersectVisitor)
void reset();
/** Add a line segment to use for intersection testing during scene traversal.
* Note, a maximum of 32 line segments can be added to a IntersectVistor,
* adding more than this will result in warning being emitted to the console
* and the excess segments being ignored.*/
void addLineSegment(osg::LineSegment* seg);
typedef std::vector<Hit> HitList;
typedef std::map<const osg::LineSegment*,HitList > LineSegmentHitListMap;
HitList& getHitList(const osg::LineSegment* seg) { return _segHitList[seg]; }
int getNumHits(const osg::LineSegment* seg) { return _segHitList[seg].size(); }
LineSegmentHitListMap& getSegHitList() { return _segHitList; }
bool hits();
enum LODSelectionMode
{
USE_HIGHEST_LEVEL_OF_DETAIL,
USE_SEGMENT_START_POINT_AS_EYE_POINT_FOR_LOD_LEVEL_SELECTION
};
void setLODSelectionMode(LODSelectionMode mode) { _lodSelectionMode = mode; }
LODSelectionMode getLODSelectionMode() const { return _lodSelectionMode; }
/** Set the eye point in local coordinates.
* This is a pseudo-EyePoint for billboarding and LOD purposes.
* It is copied from the Start point of the most-recently-added segment
* of the intersection ray set (IntersectState::_segList). */
void setEyePoint(const osg::Vec3& eye) { _pseudoEyePoint = eye; }
virtual osg::Vec3 getEyePoint() const;
/** Get the distance from a point to the eye point, distance value in local coordinate system.
* This is calculated using the pseudo-EyePoint (above) when doing LOD calculcations. */
virtual float getDistanceToEyePoint(const osg::Vec3& pos, bool withLODScale) const;
virtual void apply(osg::Node&);
virtual void apply(osg::Drawable&);
virtual void apply(osg::Geode& node);
virtual void apply(osg::Billboard& node);
virtual void apply(osg::Group& node);
virtual void apply(osg::Transform& node);
virtual void apply(osg::Switch& node);
virtual void apply(osg::LOD& node);
protected:
class IntersectState : public osg::Referenced
{
public:
IntersectState();
osg::ref_ptr<osg::RefMatrix> _view_matrix;
osg::ref_ptr<osg::RefMatrix> _view_inverse;
osg::ref_ptr<osg::RefMatrix> _model_matrix;
osg::ref_ptr<osg::RefMatrix> _model_inverse;
typedef std::pair<osg::ref_ptr<osg::LineSegment>,osg::ref_ptr<osg::LineSegment> > LineSegmentPair;
typedef std::vector< LineSegmentPair > LineSegmentList;
LineSegmentList _segList;
typedef unsigned int LineSegmentMask;
typedef std::vector<LineSegmentMask> LineSegmentMaskStack;
LineSegmentMaskStack _segmentMaskStack;
bool isCulled(const osg::BoundingSphere& bs,LineSegmentMask& segMaskOut);
bool isCulled(const osg::BoundingBox& bb,LineSegmentMask& segMaskOut);
void addLineSegment(osg::LineSegment* seg);
protected:
~IntersectState();
};
bool intersect(osg::Drawable& gset);
void pushMatrix(osg::RefMatrix* matrix, osg::Transform::ReferenceFrame rf);
void popMatrix();
bool enterNode(osg::Node& node);
void leaveNode();
typedef std::vector<osg::ref_ptr<IntersectState> > IntersectStateStack;
IntersectStateStack _intersectStateStack;
LineSegmentHitListMap _segHitList;
LODSelectionMode _lodSelectionMode;
osg::Vec3 _pseudoEyePoint;
};
/** Deprecated Use LineSegmentIntersector/IntersectionVisitor or View::computeIntersections(..).*/
class OSGUTIL_EXPORT PickVisitor : public osgUtil::IntersectVisitor
{
public:
PickVisitor(const osg::Viewport* viewport, const osg::Matrixd& proj, const osg::Matrixd& view, float mx, float my);
void runNestedPickVisitor(osg::Node& node, const osg::Viewport* viewport, const osg::Matrix& proj, const osg::Matrix& view, float mx, float my);
void apply(osg::Projection& projection);
void apply(osg::Camera& camera);
protected:
float _mx;
float _my;
osg::ref_ptr<const osg::Viewport> _lastViewport;
osg::Matrixd _lastProjectionMatrix;
osg::Matrixd _lastViewMatrix;
};
}
#endif