FGFS-4.1/OpenSceneGraph
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Fixes to the occluder culling code to properly disable occluders to prevent

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self occlusion.
This commit is contained in:
Robert Osfield
2002-06-17 09:10:26 +00:00
parent 156a9fbaea
commit 27412c27c9
10 changed files with 151 additions and 61 deletions
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92
src/Demos/osgoccluder/osgoccluder.cpp
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@@ -52,29 +52,11 @@ void write_usage(std::ostream& out,const std::string& name)
}
osg::Node* createOccludersAroundModel(osg::Node* model)
osg::Node* createOccluder(const osg::Vec3& v1,const osg::Vec3& v2,const osg::Vec3& v3,const osg::Vec3& v4)
{
osg::Group* scene = osgNew osg::Group;
scene->setName("rootgroup");
// add the loaded model into a the scene group.
scene->addChild(model);
model->setName("model");
// create and occluder which will site along side the loadmodel model.
// create and occluder which will site along side the loadmodel model.
osg::OccluderNode* occluderNode = osgNew osg::OccluderNode;
// get the bounding volume of the model.
const osg::BoundingSphere bs = model->getBound();
// create a bounding box around the sphere.
osg::BoundingBox bb;
bb.expandBy(bs);
// create the convex planer occluder
osg::ConvexPlanerOccluder* cpo = osgNew osg::ConvexPlanerOccluder;
@@ -84,25 +66,11 @@ osg::Node* createOccludersAroundModel(osg::Node* model)
// set the occluder up for the front face of the bounding box.
osg::ConvexPlanerPolygon& occluder = cpo->getOccluder();
occluder.add(osg::Vec3(bb.xMin(),bb.yMin(),bb.zMin()));
occluder.add(osg::Vec3(bb.xMax(),bb.yMin(),bb.zMin()));
occluder.add(osg::Vec3(bb.xMax(),bb.yMin(),bb.zMax()));
occluder.add(osg::Vec3(bb.xMin(),bb.yMin(),bb.zMax()));
//
// // create a hole in the occluder.
// osg::Vec3 center((bb.xMin()+bb.xMax())*0.5f,bb.yMin(),(bb.zMin()+bb.zMax())*0.5f);
// float dx = (bb.xMax()-bb.xMin())*0.25f;
// float dz = (bb.zMax()-bb.zMin())*0.25f;
//
//
// cpo->getHoleList().push_back();
// osg::ConvexPlanerPolygon& hole = cpo->getHoleList().back();
// hole.add(center+osg::Vec3(-dx,0.0,-dz));
// hole.add(center+osg::Vec3(dx,0.0,-dz));
// hole.add(center+osg::Vec3(dx,0.0,dz));
// hole.add(center+osg::Vec3(-dx,0.0,dz));
occluder.add(v1);
occluder.add(v2);
occluder.add(v3);
occluder.add(v4);
// create a drawable for occluder.
osg::GeoSet* geoset = osgNew osg::GeoSet;
@@ -134,8 +102,50 @@ osg::Node* createOccludersAroundModel(osg::Node* model)
// geode will never be occluder by this occluder.
occluderNode->addChild(geode);
// add the occluder node into the scene.
scene->addChild(occluderNode);
return occluderNode;
}
osg::Node* createOccludersAroundModel(osg::Node* model)
{
osg::Group* scene = osgNew osg::Group;
scene->setName("rootgroup");
// add the loaded model into a the scene group.
scene->addChild(model);
model->setName("model");
// get the bounding volume of the model.
const osg::BoundingSphere bs = model->getBound();
// create a bounding box around the sphere.
osg::BoundingBox bb;
bb.expandBy(bs);
// front
scene->addChild(createOccluder(bb.corner(0),
bb.corner(1),
bb.corner(5),
bb.corner(4)));
// right side
scene->addChild(createOccluder(bb.corner(1),
bb.corner(3),
bb.corner(7),
bb.corner(5)));
// left side
scene->addChild(createOccluder(bb.corner(2),
bb.corner(0),
bb.corner(4),
bb.corner(6)));
// back side
scene->addChild(createOccluder(bb.corner(3),
bb.corner(2),
bb.corner(6),
bb.corner(7)));
return scene;
}