fd2ffeb310
Added beginnings of new osgViewer::Scene,View,Viewer,CompositeViewer and GraphicsWindowProxy files.
232 lines
8.5 KiB
C++
232 lines
8.5 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library 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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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGUTIL_INTERSECTVISITOR
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#define OSGUTIL_INTERSECTVISITOR 1
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#include <osg/NodeVisitor>
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#include <osg/LineSegment>
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#include <osg/Geode>
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#include <osg/Matrix>
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#include <osg/Transform>
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#include <osgUtil/Export>
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#include <map>
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#include <set>
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#include <vector>
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namespace osgUtil {
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class OSGUTIL_EXPORT Hit
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{
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/** Describes a point in space produced by an intersection of a line with a scene.
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* A Hit is always on a surface as rendered by the Open Scene Graph scene (usually
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* a triangle or other primitive, but a special hit handler could return a
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* different value perhaps: a sphere shape might return a Hit on the true sphere
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* rather than the approximate tesselated sphere rendered.
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*/
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public:
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Hit();
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Hit(const Hit& hit);
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~Hit();
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Hit& operator = (const Hit& hit);
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typedef std::vector<int> VecIndexList;
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bool operator < (const Hit& hit) const
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{
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if (_originalLineSegment<hit._originalLineSegment) return true;
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if (hit._originalLineSegment<_originalLineSegment) return false;
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return _ratio<hit._ratio;
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}
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const osg::Vec3& getLocalIntersectPoint() const { return _intersectPoint; }
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const osg::Vec3& getLocalIntersectNormal() const { return _intersectNormal; }
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const osg::Vec3 getWorldIntersectPoint() const { if (_matrix.valid()) return _intersectPoint*(*_matrix); else return _intersectPoint; }
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const osg::Vec3 getWorldIntersectNormal() const ;
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float getRatio() const { return _ratio; }
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const osg::LineSegment* getOriginalLineSegment() const { return _originalLineSegment.get(); }
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const osg::LineSegment* getLocalLineSegment() const { return _localLineSegment.get(); }
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osg::NodePath& getNodePath() { return _nodePath; }
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const osg::NodePath& getNodePath() const { return _nodePath; }
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osg::Geode* getGeode() { return _geode.get(); }
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const osg::Geode* getGeode() const { return _geode.get(); }
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osg::Drawable* getDrawable() { return _drawable.get(); }
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const osg::Drawable* getDrawable() const { return _drawable.get(); }
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const osg::RefMatrix* getMatrix() const { return _matrix.get(); }
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const osg::RefMatrix* getInverseMatrix() const { return _inverse.get(); }
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const VecIndexList& getVecIndexList() const { return _vecIndexList; }
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int getPrimitiveIndex() const { return _primitiveIndex; }
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float _ratio;
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osg::ref_ptr<osg::LineSegment> _originalLineSegment;
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osg::ref_ptr<osg::LineSegment> _localLineSegment;
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osg::NodePath _nodePath;
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osg::ref_ptr<osg::Geode> _geode;
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osg::ref_ptr<osg::Drawable> _drawable;
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osg::ref_ptr<osg::RefMatrix> _matrix;
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osg::ref_ptr<osg::RefMatrix> _inverse;
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VecIndexList _vecIndexList;
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int _primitiveIndex;
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osg::Vec3 _intersectPoint;
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osg::Vec3 _intersectNormal;
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};
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/** Basic visitor for ray based collisions of a scene.*/
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class OSGUTIL_EXPORT IntersectVisitor : public osg::NodeVisitor
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{
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public:
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IntersectVisitor();
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virtual ~IntersectVisitor();
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void reset();
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/** Add a line segment to use for intersection testing during scene traversal.
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* Note, a maximum of 32 line segments can be added to a IntersectVistor,
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* adding more than this will result in warning being emitted to the console
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* and the excess segments being ignored.*/
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void addLineSegment(osg::LineSegment* seg);
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typedef std::vector<Hit> HitList;
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typedef std::map<const osg::LineSegment*,HitList > LineSegmentHitListMap;
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HitList& getHitList(const osg::LineSegment* seg) { return _segHitList[seg]; }
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int getNumHits(const osg::LineSegment* seg) { return _segHitList[seg].size(); }
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LineSegmentHitListMap& getSegHitList() { return _segHitList; }
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bool hits();
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enum LODSelectionMode
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{
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USE_HIGHEST_LEVEL_OF_DETAIL,
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USE_SEGMENT_START_POINT_AS_EYE_POINT_FOR_LOD_LEVEL_SELECTION
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};
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void setLODSelectionMode(LODSelectionMode mode) { _lodSelectionMode = mode; }
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LODSelectionMode getLODSelectionMode() const { return _lodSelectionMode; }
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/** Set the eye point in local coordinates.
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* This is a pseudo-EyePoint for billboarding and LOD purposes.
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* It is copied from the Start point of the most-recently-added segment
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* of the intersection ray set (IntersectState::_segList). */
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void setEyePoint(const osg::Vec3& eye) { _pseudoEyePoint = eye; }
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virtual osg::Vec3 getEyePoint() const;
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/** Get the distance from a point to the eye point, distance value in local coordinate system.
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* This is calculated using the pseudo-EyePoint (above) when doing LOD calculcations. */
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virtual float getDistanceToEyePoint(const osg::Vec3& pos, bool withLODScale) const;
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virtual void apply(osg::Node&);
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virtual void apply(osg::Geode& node);
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virtual void apply(osg::Billboard& node);
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virtual void apply(osg::Group& node);
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virtual void apply(osg::Transform& node);
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virtual void apply(osg::Switch& node);
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virtual void apply(osg::LOD& node);
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protected:
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class IntersectState : public osg::Referenced
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{
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public:
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IntersectState();
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osg::ref_ptr<osg::RefMatrix> _view_matrix;
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osg::ref_ptr<osg::RefMatrix> _view_inverse;
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osg::ref_ptr<osg::RefMatrix> _model_matrix;
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osg::ref_ptr<osg::RefMatrix> _model_inverse;
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typedef std::pair<osg::ref_ptr<osg::LineSegment>,osg::ref_ptr<osg::LineSegment> > LineSegmentPair;
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typedef std::vector< LineSegmentPair > LineSegmentList;
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LineSegmentList _segList;
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typedef unsigned int LineSegmentMask;
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typedef std::vector<LineSegmentMask> LineSegmentMaskStack;
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LineSegmentMaskStack _segmentMaskStack;
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bool isCulled(const osg::BoundingSphere& bs,LineSegmentMask& segMaskOut);
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bool isCulled(const osg::BoundingBox& bb,LineSegmentMask& segMaskOut);
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void addLineSegment(osg::LineSegment* seg);
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protected:
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~IntersectState();
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};
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bool intersect(osg::Drawable& gset);
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void pushMatrix(osg::RefMatrix* matrix, osg::Transform::ReferenceFrame rf);
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void popMatrix();
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bool enterNode(osg::Node& node);
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void leaveNode();
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typedef std::vector<osg::ref_ptr<IntersectState> > IntersectStateStack;
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IntersectStateStack _intersectStateStack;
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LineSegmentHitListMap _segHitList;
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LODSelectionMode _lodSelectionMode;
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osg::Vec3 _pseudoEyePoint;
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};
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/** Picking intersection visitor specialises the IntersectVistor to allow more convinient handling of mouse picking.*/
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class OSGUTIL_EXPORT PickVisitor : public osgUtil::IntersectVisitor
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{
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public:
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PickVisitor(const osg::Viewport* viewport, const osg::Matrixd& proj, const osg::Matrixd& view, float mx, float my);
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void runNestedPickVisitor(osg::Node& node, const osg::Viewport* viewport, const osg::Matrix& proj, const osg::Matrix& view, float mx, float my);
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void apply(osg::Projection& projection);
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void apply(osg::Camera& camera);
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protected:
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float _mx;
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float _my;
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osg::ref_ptr<const osg::Viewport> _lastViewport;
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osg::Matrixd _lastProjectionMatrix;
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osg::Matrixd _lastViewMatrix;
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};
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}
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#endif
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