From e467027946fb4da320e937b9b659d7efd5b956a4 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 12 Jun 2002 13:54:14 +0000
Subject: [PATCH] Fix for renaming of ShadowOccluderVolume to
 ShadowVolumeOccluder.

---
 include/osg/CullingSet              |  2 +-
 include/osg/ShadowVolumeOccluder    |  6 +++---
 src/osg/CollectOccludersVisitor.cpp |  2 +-
 src/osg/ShadowVolumeOccluder.cpp    | 14 ++++++++++++--
 4 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/include/osg/CullingSet b/include/osg/CullingSet
index 45710bbaa..1ca83ccb2 100644
--- a/include/osg/CullingSet
+++ b/include/osg/CullingSet
@@ -6,7 +6,7 @@
 #define OSG_CullingSet 1
 
 #include <osg/Polytope>
-#include <osg/ShadowOccluderVolume>
+#include <osg/ShadowVolumeOccluder>
 #include <osg/Referenced>
 
 namespace osg {
diff --git a/include/osg/ShadowVolumeOccluder b/include/osg/ShadowVolumeOccluder
index f6ab846ed..7dde421c2 100644
--- a/include/osg/ShadowVolumeOccluder
+++ b/include/osg/ShadowVolumeOccluder
@@ -27,13 +27,13 @@ class SG_EXPORT ShadowVolumeOccluder
             _occluderVolume(soc._occluderVolume),
             _holeList(soc._holeList) {}
 
-        ShadowVolumeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,const Matrix& MVP)
+        ShadowVolumeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,const Matrix& MV,const Matrix& P)
         {
-            computeOccluder(nodePath,occluder,MVP);
+            computeOccluder(nodePath,occluder,MV,P);
         }
 
         /** compute the shadow volume occluder. */
-        void computeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,const Matrix& MVP);
+        void computeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,const Matrix& MV,const Matrix& P);
         
 
         inline void disableResultMasks();
diff --git a/src/osg/CollectOccludersVisitor.cpp b/src/osg/CollectOccludersVisitor.cpp
index 816b3b8dc..604b51b17 100644
--- a/src/osg/CollectOccludersVisitor.cpp
+++ b/src/osg/CollectOccludersVisitor.cpp
@@ -114,7 +114,7 @@ void CollectOccludersVisitor::apply(osg::OccluderNode& node)
     
         // need to test occluder against view frustum.
         std::cout << "    adding in Occluder"<<std::endl;
-        _occluderList.push_back(ShadowVolumeOccluder(_nodePath, *node.getOccluder(), getModelViewMatrix()));
+        _occluderList.push_back(ShadowVolumeOccluder(_nodePath, *node.getOccluder(), getModelViewMatrix(),getProjectionMatrix()));
     }
 
     traverse(node);
diff --git a/src/osg/ShadowVolumeOccluder.cpp b/src/osg/ShadowVolumeOccluder.cpp
index ebc63c48d..fcb4f1ed9 100644
--- a/src/osg/ShadowVolumeOccluder.cpp
+++ b/src/osg/ShadowVolumeOccluder.cpp
@@ -1,11 +1,21 @@
-#include <osg/ShadowOccluderVolume>
+#include <osg/ShadowVolumeOccluder>
 
 using namespace osg;
 
 
-void ShadowVolumeOccluder::computeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,const Matrix& MVP)
+void ShadowVolumeOccluder::computeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,const Matrix& MV,const Matrix& P)
 {
     std::cout<<"    Computing Occluder"<<std::endl;
+    
+    // for the occluder polygon and each of the holes do
+    //     first transform occluder polygon into clipspace by multiple it by c[i] = v[i]*(MV*P)
+    //     then push to coords to far plane by setting its coord to c[i].z = -1.
+    //     then transform far plane polygon back into projection space, by p[i]*inv(P)
+    //     compute orientation of front plane, if normal.z()<0 then facing away from eye pont, so reverse the polygons, or simply invert planes.
+    //     compute volume (quality) betwen front polygon in projection space and back polygon in projection space.
+    
+    
+    
 }
 
 bool ShadowVolumeOccluder::contains(const std::vector<Vec3>& vertices)