FGFS-4.1/OpenSceneGraph
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Added support for cullable state, that uses a polytope to define the extents

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of objects that will be influenced by it.
This commit is contained in:
Robert Osfield
2005-09-07 16:18:43 +00:00
parent 58112d9591
commit 765db1998c
5 changed files with 106 additions and 20 deletions
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34
src/osgSim/OverlayNode.cpp
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@@ -13,6 +13,7 @@
#include <osg/Texture2D>
#include <osg/CoordinateSystemNode>
#include <osg/io_utils>
#include <osgUtil/CullVisitor>
#include <osgSim/OverlayNode>
@@ -116,10 +117,6 @@ void OverlayNode::traverse(osg::NodeVisitor& nv)
if (bs.valid())
{
// update the bounding volume for later testing
// whether the overlay can be seen or not.
_overlaySubgraphBound = bs;
// see if we are within a coordinate system node.
osg::CoordinateSystemNode* csn = 0;
osg::NodePath& nodePath = nv.getNodePath();
@@ -171,8 +168,10 @@ void OverlayNode::traverse(osg::NodeVisitor& nv)
// compute the matrix which takes a vertex from local coords into tex coords
// will use this later to specify osg::TexGen..
osg::Matrix MVPT = _camera->getViewMatrix() *
_camera->getProjectionMatrix() *
osg::Matrix MVP = _camera->getViewMatrix() *
_camera->getProjectionMatrix();
osg::Matrix MVPT = MVP *
osg::Matrix::translate(1.0,1.0,1.0) *
osg::Matrix::scale(0.5,0.5,0.5);
@@ -180,6 +179,11 @@ void OverlayNode::traverse(osg::NodeVisitor& nv)
_texgenNode->getTexGen()->setPlanesFromMatrix(MVPT);
_textureFrustum.setToUnitFrustum(false,false);
// const osg::Matrix modelView = (cv->getModelViewMatrix());
// _textureFrustum.transformProvidingInverse(osg::Matrix::inverse(modelView)*MVP);
_textureFrustum.transformProvidingInverse(MVP);
_camera->accept(*cv);
_textureObjectValidList[contextID] = 1;
@@ -202,14 +206,28 @@ void OverlayNode::traverse(osg::NodeVisitor& nv)
else
#endif
{
_texgenNode->accept(*cv);
osg::CullingSet& pcs = cv->getProjectionCullingStack().back();
osg::CullingSet& ccs = cv->getCurrentCullingSet();
const osg::Matrix modelView = (cv->getModelViewMatrix());
osg::Polytope viewTextureFrustum;
viewTextureFrustum.setAndTransformProvidingInverse(_textureFrustum, osg::Matrix::inverse(modelView));
pcs.addStateFrustum(_mainSubgraphStateSet.get(), viewTextureFrustum);
ccs.addStateFrustum(_mainSubgraphStateSet.get(), _textureFrustum);
// push the stateset.
cv->pushStateSet(_mainSubgraphStateSet.get());
// cv->pushStateSet(_mainSubgraphStateSet.get());
Group::traverse(nv);
cv->popStateSet();
// cv->popStateSet();
ccs.getStateFrustumList().pop_back();
pcs.getStateFrustumList().pop_back();
}
}