From b2fd8f4059060818db720cf412c555e4d3088f79 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 7 Sep 2011 16:26:57 +0000
Subject: [PATCH] Added handling of the case when RenderLeaf::_modelview matrix
 is NULL, such as when LightPointNode is used in the scene graph.

---
 src/osgShadow/ViewDependentShadowMap.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/osgShadow/ViewDependentShadowMap.cpp b/src/osgShadow/ViewDependentShadowMap.cpp
index 201a26c34..5ce83e9c8 100644
--- a/src/osgShadow/ViewDependentShadowMap.cpp
+++ b/src/osgShadow/ViewDependentShadowMap.cpp
@@ -1408,7 +1408,16 @@ struct RenderLeafBounds
         if (renderLeaf->_modelview.get()!=previous_modelview)
         {
             previous_modelview = renderLeaf->_modelview.get();
-            light_mvp.mult(*renderLeaf->_modelview, light_vp);
+            if (previous_modelview)
+            {
+                light_mvp.mult(*renderLeaf->_modelview, light_vp);
+            }
+            else
+            {
+                // no modelview matrix (such as when LightPointNode is in the scene graph) so assume
+                // that modelview matrix is indentity.
+                light_mvp = light_vp;
+            }
             OSG_INFO<<"Computing new light_mvp "<<light_mvp<<std::endl;
         }
         else