FGFS-4.1/OpenSceneGraph
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Added support for occlusion of holes in occluders, and cleaned up the

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interface to ShadowVolumeOccluders.
This commit is contained in:
Robert Osfield
2002-06-19 10:19:10 +00:00
parent b3c26d5634
commit 21beb236d2
5 changed files with 61 additions and 8 deletions
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28
src/Demos/osgoccluder/osgoccluder.cpp
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@@ -52,7 +52,7 @@ void write_usage(std::ostream& out,const std::string& name)
}
osg::Node* createOccluder(const osg::Vec3& v1,const osg::Vec3& v2,const osg::Vec3& v3,const osg::Vec3& v4)
osg::Node* createOccluder(const osg::Vec3& v1,const osg::Vec3& v2,const osg::Vec3& v3,const osg::Vec3& v4,float holeRatio=-1.0f)
{
// create and occluder which will site along side the loadmodel model.
osg::OccluderNode* occluderNode = osgNew osg::OccluderNode;
@@ -70,7 +70,28 @@ osg::Node* createOccluder(const osg::Vec3& v1,const osg::Vec3& v2,const osg::Vec
occluder.add(v2);
occluder.add(v3);
occluder.add(v4);
// create a whole at the center of the occluder if needed.
if (holeRatio>0.0f)
{
// create hole.
float ratio = holeRatio;
float one_minus_ratio = 1-ratio;
osg::Vec3 center = (v1+v2+v3+v4)*0.25f;
osg::Vec3 v1dash = v1*ratio + center*one_minus_ratio;
osg::Vec3 v2dash = v2*ratio + center*one_minus_ratio;
osg::Vec3 v3dash = v3*ratio + center*one_minus_ratio;
osg::Vec3 v4dash = v4*ratio + center*one_minus_ratio;
osg::ConvexPlanerPolygon hole;
hole.add(v1dash);
hole.add(v2dash);
hole.add(v3dash);
hole.add(v4dash);
cpo->addHole(hole);
}
// create a drawable for occluder.
osg::GeoSet* geoset = osgNew osg::GeoSet;
@@ -145,7 +166,8 @@ osg::Node* createOccludersAroundModel(osg::Node* model)
scene->addChild(createOccluder(bb.corner(3),
bb.corner(2),
bb.corner(6),
bb.corner(7)));
bb.corner(7),
0.5f)); // create a hole half the size of the occluder.
return scene;
}