FGFS-4.1/OpenSceneGraph
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Improved handling of bounding polytope

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This commit is contained in:
Robert Osfield
2006-11-24 17:20:01 +00:00
parent 006435e679
commit 5044a85c9e
3 changed files with 82 additions and 21 deletions
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31
examples/osgshadow/osgshadow.cpp
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@@ -22,6 +22,19 @@ public:
}
osg::BoundingBox& getBoundingBox() { return _bb; }
void getPolytope(osg::Polytope& polytope, float margin=0.1) const
{
float delta = _bb.radius()*margin;
polytope.add( osg::Plane(0.0, 0.0, 1.0, -(_bb.zMin()-delta)) );
polytope.add( osg::Plane(0.0, 0.0, -1.0, (_bb.zMax()+delta)) );
polytope.add( osg::Plane(1.0, 0.0, 0.0, -(_bb.xMin()-delta)) );
polytope.add( osg::Plane(-1.0, 0.0, 0.0, (_bb.xMax()+delta)) );
polytope.add( osg::Plane(0.0, 1.0, 0.0, -(_bb.yMin()-delta)) );
polytope.add( osg::Plane(0.0, -1.0, 0.0, (_bb.yMax()+delta)) );
}
void apply(osg::Node& node)
{
@@ -137,24 +150,26 @@ int main(int argc, char** argv)
return 1;
}
ComputeBoundingBoxVisitor cbbv;
model->accept(cbbv);
const osg::BoundingBox& bb = cbbv.getBoundingBox();
osg::Plane basePlane(0.0, 0.0, 1.0, -bb.zMin() );
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::ref_ptr<osgShadow::OccluderGeometry> occluder = new osgShadow::OccluderGeometry;
occluder->computeOccluderGeometry(model.get());
occluder->getBoundingPolytope().add(basePlane);
ComputeBoundingBoxVisitor cbbv;
model->accept(cbbv);
cbbv.getPolytope(occluder->getBoundingPolytope(),0.001);
osg::BoundingBox bb = cbbv.getBoundingBox();
//geode->addDrawable(occluder.get());
osg::ref_ptr<osgShadow::ShadowVolumeGeometry> shadowVolume = new osgShadow::ShadowVolumeGeometry;
#if 0
occluder->comptueShadowVolumeGeometry(osg::Vec4(bb.xMin(), bb.yMin(), bb.zMax() + bb.radius() ,1.0f), *shadowVolume);
#if 1
// occluder->comptueShadowVolumeGeometry(osg::Vec4(bb.xMin()+ bb.radius(), bb.yMin()+ bb.radius(), bb.zMax() + bb.radius() ,1.0f), *shadowVolume);
occluder->comptueShadowVolumeGeometry(osg::Vec4(bb.center().x(), bb.center().y(), bb.zMax() + bb.radius() ,1.0f), *shadowVolume);
#else
occluder->comptueShadowVolumeGeometry(osg::Vec4(0.5f,-.5f,-1.0f,0.0f), *shadowVolume);
occluder->comptueShadowVolumeGeometry(osg::Vec4(0.5f,.25f,0.2f,0.0f), *shadowVolume);
#endif
geode->addDrawable(shadowVolume.get());