Added support for cullable state, that uses a polytope to define the extents

of objects that will be influenced by it.

examples/osgsimulation/osgsimulation.cpp

@@ -323,14 +323,14 @@ int main(int argc, char **argv)
             
             // tell the overlay node to continously update its overlay texture
             // as we know we'll be tracking a moving target.
-            overlayNode->setContinousUpdate(true);
+            // overlayNode->setContinousUpdate(true);
         }
         
         
         osg::Node* cessna = osgDB::readNodeFile("cessna.osg");
         if (cessna)
         {
-            double s = 30000.0 / cessna->getBound().radius();
+            double s = 600000.0 / cessna->getBound().radius();
         
             osg::MatrixTransform* scaler = new osg::MatrixTransform;
             scaler->addChild(cessna);

include/osg/CullingSet

@@ -29,6 +29,8 @@ class OSG_EXPORT CullingSet : public Referenced
 
     public:
 
+        typedef std::pair< osg::ref_ptr<osg::StateSet>, osg::Polytope > StateFrustumPair;
+        typedef std::vector< StateFrustumPair > StateFrustumList;   
     
         CullingSet();
 
@@ -36,6 +38,7 @@ class OSG_EXPORT CullingSet : public Referenced
             Referenced(),
             _mask(cs._mask),
             _frustum(cs._frustum),
+            _stateFrustumList(cs._stateFrustumList),
             _occluderList(cs._occluderList),
             _pixelSizeVector(cs._pixelSizeVector),
             _smallFeatureCullingPixelSize(cs._smallFeatureCullingPixelSize)
@@ -45,6 +48,7 @@ class OSG_EXPORT CullingSet : public Referenced
         CullingSet(const CullingSet& cs,const Matrix& matrix, const Vec4& pixelSizeVector):
             _mask(cs._mask),
             _frustum(cs._frustum),
+            _stateFrustumList(cs._stateFrustumList),
             _occluderList(cs._occluderList),
             _pixelSizeVector(pixelSizeVector),
             _smallFeatureCullingPixelSize(cs._smallFeatureCullingPixelSize)
@@ -64,6 +68,7 @@ class OSG_EXPORT CullingSet : public Referenced
             
             _mask = cs._mask;
             _frustum = cs._frustum;
+            _stateFrustumList = cs._stateFrustumList;
             _occluderList = cs._occluderList;
             _pixelSizeVector = cs._pixelSizeVector;
             _smallFeatureCullingPixelSize = cs._smallFeatureCullingPixelSize;
@@ -76,6 +81,7 @@ class OSG_EXPORT CullingSet : public Referenced
         {
             _mask = cs._mask;
             _frustum = cs._frustum;
+            _stateFrustumList = cs._stateFrustumList;
             _occluderList = cs._occluderList;
             _pixelSizeVector = cs._pixelSizeVector;
             _smallFeatureCullingPixelSize = cs._smallFeatureCullingPixelSize;
@@ -84,6 +90,7 @@ class OSG_EXPORT CullingSet : public Referenced
         inline void set(const CullingSet& cs,const Matrix& matrix, const Vec4& pixelSizeVector)
         {
             _mask = cs._mask;
+            _stateFrustumList = cs._stateFrustumList;
             _occluderList = cs._occluderList;
             _pixelSizeVector = pixelSizeVector;
             _smallFeatureCullingPixelSize = cs._smallFeatureCullingPixelSize;
@@ -93,6 +100,13 @@ class OSG_EXPORT CullingSet : public Referenced
             
             _frustum.setAndTransformProvidingInverse(cs._frustum,matrix);
             
+            for(StateFrustumList::iterator itr=_stateFrustumList.begin();
+                itr!=_stateFrustumList.end();
+                ++itr)
+            {
+                itr->second.transformProvidingInverse(matrix);
+            }
+
             for(OccluderList::iterator itr=_occluderList.begin();
                 itr!=_occluderList.end();
                 ++itr)
@@ -133,8 +147,12 @@ class OSG_EXPORT CullingSet : public Referenced
         Polytope& getFrustum() { return _frustum; }
         const Polytope& getFrustum() const { return _frustum; }    
         
-        void addOccluder(ShadowVolumeOccluder& cv) { _occluderList.push_back(cv); }
+        void addStateFrustum(StateSet* stateset, Polytope& polytope) { _stateFrustumList.push_back(StateFrustumPair(stateset,polytope)); }
         
+        void getStateFrustumList(StateFrustumList& sfl) { _stateFrustumList = sfl; }
+        StateFrustumList& getStateFrustumList() { return _stateFrustumList; }
+
+        void addOccluder(ShadowVolumeOccluder& cv) { _occluderList.push_back(cv); }
 
         void setPixelSizeVector(const Vec4& v) { _pixelSizeVector = v; }
 
@@ -247,6 +265,17 @@ class OSG_EXPORT CullingSet : public Referenced
         {
             _frustum.pushCurrentMask();
             
+            if (!_stateFrustumList.empty())
+            {
+                for(StateFrustumList::iterator itr=_stateFrustumList.begin();
+                    itr!=_stateFrustumList.end();
+                    ++itr)
+                {
+                    itr->second.pushCurrentMask();
+                }
+            }
+
+
 #ifdef COMPILE_WITH_SHADOW_OCCLUSION_CULLING
             if (!_occluderList.empty())
             {
@@ -264,6 +293,16 @@ class OSG_EXPORT CullingSet : public Referenced
         {
             _frustum.popCurrentMask();
 
+            if (!_stateFrustumList.empty())
+            {
+                for(StateFrustumList::iterator itr=_stateFrustumList.begin();
+                    itr!=_stateFrustumList.end();
+                    ++itr)
+                {
+                    itr->second.popCurrentMask();
+                }
+            }
+
 #ifdef COMPILE_WITH_SHADOW_OCCLUSION_CULLING
             if (!_occluderList.empty())
             {
@@ -288,6 +327,7 @@ class OSG_EXPORT CullingSet : public Referenced
 
         Mask                _mask;
         Polytope            _frustum;
+        StateFrustumList    _stateFrustumList;        
         OccluderList        _occluderList;        
         Vec4                _pixelSizeVector;
         float               _smallFeatureCullingPixelSize;

include/osgSim/OverlayNode

@@ -16,6 +16,7 @@
 
 #include <osg/buffered_value>
 #include <osg/CameraNode>
+#include <osg/Texture2D>
 #include <osg/TexGenNode>
 
 #include <osgSim/Export>
@@ -92,7 +93,7 @@ class OSGSIM_EXPORT OverlayNode : public osg::Group
         osg::ref_ptr<osg::Texture2D>    _texture;
 
         bool                            _continousUpdate;
-        osg::BoundingSphere             _overlaySubgraphBound;
+        osg::Polytope                   _textureFrustum;
 };
 
 }

src/osgSim/OverlayNode.cpp

@@ -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() * 
+            osg::Matrix MVP = _camera->getViewMatrix() * 
-                               _camera->getProjectionMatrix() *
+                              _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();
     }
 }
 

src/osgUtil/CullVisitor.cpp

@@ -25,6 +25,7 @@
 #include <osg/LineSegment>
 #include <osg/TriangleFunctor>
 #include <osg/Geometry>
+#include <osg/io_utils>
 
 #include <osgUtil/CullVisitor>
 
@@ -745,14 +746,40 @@ void CullVisitor::apply(Geode& node)
             if (!updateCalculatedNearFar(matrix,*drawable,false)) continue;
         }
 
+        // need to track how push/pops there are, so we can unravel the stack correctly.
+        unsigned int numPopStateSetRequired = 0;
+
         // push the geoset's state on the geostate stack.    
         StateSet* stateset = drawable->getStateSet();
-        if (stateset) pushStateSet(stateset);
+        if (stateset)
+        {
+            ++numPopStateSetRequired;
+            pushStateSet(stateset);
+        }
+
+        CullingSet& cs = getCurrentCullingSet();
+        if (!cs.getStateFrustumList().empty())
+        {
+            osg::CullingSet::StateFrustumList& sfl = cs.getStateFrustumList();
+            for(osg::CullingSet::StateFrustumList::iterator itr = sfl.begin();
+                itr != sfl.end();
+                ++itr)
+            {
+                if (itr->second.contains(bb))
+                {
+                    ++numPopStateSetRequired;
+                    pushStateSet(itr->first.get());
+                }
+            }
+        }
 
         if (bb.valid()) addDrawableAndDepth(drawable,&matrix,distance(bb.center(),matrix));
 	else addDrawableAndDepth(drawable,&matrix,0.0f);
 
-        if (stateset) popStateSet();
+        for(unsigned int i=0;i< numPopStateSetRequired; ++i)
+        {
+            popStateSet();
+        }
 
     }