Added initial cut of osgShadow::OccluderGeometry

VisualStudio/osgShadow/osgShadow.dsp

@@ -155,6 +155,10 @@ LIB32=link.exe -lib
 # PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
 # Begin Source File
 
+SOURCE=..\..\src\osgShadow\OccluderGeometry.cpp
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\src\osgShadow\ShadowedScene.cpp
 # End Source File
 # Begin Source File
@@ -191,6 +195,10 @@ SOURCE=..\..\include\osgShadow\Export
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\include\osgShadow\OccluderGeometry
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\include\osgShadow\ShadowedScene
 # End Source File
 # Begin Source File

include/osgShadow/OccluderGeometry

@@ -0,0 +1,100 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSGSHADOW_OCCLUDERGEOMETRY
+#define OSGSHADOW_OCCLUDERGEOMETRY 1
+
+#include <osg/Drawable>
+#include <osg/Array>
+#include <osg/PrimitiveSet>
+
+#include <osgShadow/Export>
+
+namespace osgShadow {
+
+/** OccluderGeometry provides a sepecialised geometry representation of objects in scene that occlude light and therefore cast shadows.
+  * OccluderGeometry supports the computation of silhouette edges and shadow volume geometries, as well as use as geometry that one can rendering
+  * into a shadow map or end caps for the ZP+ algorithm.  OccluderGeometry may be of the same resolution as an underlying geometry that it
+  * represents, or can be of lower resolution and combine manager seperate geometries together into a single shadow casting object. 
+  * OccluderGeometry may be attached as UserData to Nodes or to Drawables.  */
+class OSGSHADOW_EXPORT OccluderGeometry : public osg::Drawable
+{
+    public :
+        OccluderGeometry();
+
+        OccluderGeometry(const OccluderGeometry& oc, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
+            
+        virtual Object* cloneType() const { return new OccluderGeometry(); }
+        virtual Object* clone(const osg::CopyOp& copyop) const { return new OccluderGeometry(*this,copyop); }
+        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const OccluderGeometry*>(obj)!=NULL; }
+        virtual const char* libraryName() const { return "osg"; }
+        virtual const char* className() const { return "OccluderGeometry"; }
+        
+
+        struct Edge
+        {
+            Edge():
+                _p1(0),
+                _p2(0),
+                _t1(0),
+                _t2(0) {}
+
+            Edge(unsigned int p1, unsigned int p2, unsigned int t1, unsigned int t2):
+                _p1(p1),
+                _p2(p2),
+                _t1(t1),
+                _t2(t2) {}
+        
+            unsigned int _p1;
+            unsigned int _p2;
+            
+            unsigned int _t1;
+            unsigned int _t2;
+        };
+
+        typedef std::vector<osg::Vec3> Vec3List;
+        typedef std::vector<GLuint> UIntList;
+        typedef std::vector<Edge> EdgeList;
+
+
+        /** Compute an occluder geometry containing all the geometry in specified subgraph.*/
+        void computeOccluderGeometry(osg::Node* subgraph, float sampleRatio=1.0f);
+        
+        /** Compute an occluder geometry containing the geometry in specified drawable.*/
+        void computeOccluderGeometry(osg::Drawable* drawable, float sampleRatio=1.0f);
+
+        /** Render the occluder geometry. */
+        virtual void drawImplementation(osg::RenderInfo& renderInfo) const;
+        
+
+    protected :
+
+        virtual ~OccluderGeometry() {}
+        
+        inline bool isSilhouetteEdge(const osg::Vec3& lightpos, const Edge& edge) const
+        {
+            osg::Vec3 delta(lightpos-_vertices[edge._p1]);
+            return ( delta * _triangleNormals[edge._t1] ) *
+                   ( delta * _triangleNormals[edge._t2] ); 
+        }
+
+        
+        Vec3List _vertices;
+        Vec3List _triangleNormals;
+        UIntList _triangleIndices;
+        
+};
+
+}
+
+#endif

src/osgShadow/GNUmakefile

@@ -3,6 +3,7 @@ include $(TOPDIR)/Make/makedefs
 
 
 CXXFILES = \
+    OccluderGeometry.cpp\
     ShadowedScene.cpp\
     ShadowTechnique.cpp\
     ShadowMap.cpp\

src/osgShadow/OccluderGeometry.cpp

@@ -0,0 +1,39 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osgShadow/OccluderGeometry>
+
+using namespace osgShadow;
+
+OccluderGeometry::OccluderGeometry()
+{
+}
+
+OccluderGeometry::OccluderGeometry(const OccluderGeometry& oc, const osg::CopyOp& copyop):
+    osg::Drawable(oc,copyop)
+{
+    
+}
+
+
+void OccluderGeometry::computeOccluderGeometry(osg::Node* subgraph, float sampleRatio)
+{
+}
+
+void OccluderGeometry::computeOccluderGeometry(osg::Drawable* drawable, float sampleRatio)
+{
+}
+
+void OccluderGeometry::drawImplementation(osg::RenderInfo& renderInfo) const
+{
+}

src/osgShadow/ShadowedScene.cpp

@@ -20,7 +20,6 @@
 #include <osgShadow/ShadowedScene>
 
 using namespace osgShadow;
-using namespace osg;
 
 ShadowedScene::ShadowedScene()
 {