101 lines
3.7 KiB
C++
101 lines
3.7 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 OSGSHADOW_OCCLUDERGEOMETRY
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#define OSGSHADOW_OCCLUDERGEOMETRY 1
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#include <osg/Drawable>
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#include <osg/Array>
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#include <osg/PrimitiveSet>
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#include <osgShadow/Export>
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namespace osgShadow {
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/** OccluderGeometry provides a sepecialised geometry representation of objects in scene that occlude light and therefore cast shadows.
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* OccluderGeometry supports the computation of silhouette edges and shadow volume geometries, as well as use as geometry that one can rendering
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* into a shadow map or end caps for the ZP+ algorithm. OccluderGeometry may be of the same resolution as an underlying geometry that it
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* represents, or can be of lower resolution and combine manager seperate geometries together into a single shadow casting object.
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* OccluderGeometry may be attached as UserData to Nodes or to Drawables. */
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class OSGSHADOW_EXPORT OccluderGeometry : public osg::Drawable
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{
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public :
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OccluderGeometry();
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OccluderGeometry(const OccluderGeometry& oc, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
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virtual Object* cloneType() const { return new OccluderGeometry(); }
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virtual Object* clone(const osg::CopyOp& copyop) const { return new OccluderGeometry(*this,copyop); }
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virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const OccluderGeometry*>(obj)!=NULL; }
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virtual const char* libraryName() const { return "osg"; }
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virtual const char* className() const { return "OccluderGeometry"; }
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struct Edge
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{
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Edge():
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_p1(0),
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_p2(0),
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_t1(0),
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_t2(0) {}
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Edge(unsigned int p1, unsigned int p2, unsigned int t1, unsigned int t2):
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_p1(p1),
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_p2(p2),
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_t1(t1),
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_t2(t2) {}
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unsigned int _p1;
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unsigned int _p2;
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unsigned int _t1;
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unsigned int _t2;
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};
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typedef std::vector<osg::Vec3> Vec3List;
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typedef std::vector<GLuint> UIntList;
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typedef std::vector<Edge> EdgeList;
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/** Compute an occluder geometry containing all the geometry in specified subgraph.*/
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void computeOccluderGeometry(osg::Node* subgraph, float sampleRatio=1.0f);
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/** Compute an occluder geometry containing the geometry in specified drawable.*/
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void computeOccluderGeometry(osg::Drawable* drawable, float sampleRatio=1.0f);
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/** Render the occluder geometry. */
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virtual void drawImplementation(osg::RenderInfo& renderInfo) const;
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protected :
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virtual ~OccluderGeometry() {}
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inline bool isSilhouetteEdge(const osg::Vec3& lightpos, const Edge& edge) const
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{
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osg::Vec3 delta(lightpos-_vertices[edge._p1]);
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return ( delta * _triangleNormals[edge._t1] ) *
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( delta * _triangleNormals[edge._t2] );
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}
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Vec3List _vertices;
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Vec3List _triangleNormals;
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UIntList _triangleIndices;
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};
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}
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#endif
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