From ec658b115c3f8b6964a8da72f53326d8f1abfb07 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 24 Apr 2014 10:38:58 +0000
Subject: [PATCH] Fixed reference invalidation bug.

---
 src/osgSim/SphereSegment.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/osgSim/SphereSegment.cpp b/src/osgSim/SphereSegment.cpp
index fdb4f87d1..3b25fce1b 100644
--- a/src/osgSim/SphereSegment.cpp
+++ b/src/osgSim/SphereSegment.cpp
@@ -1030,14 +1030,12 @@ class PolytopeVisitor : public osg::NodeVisitor
         {
             if (_polytopeStack.back().second.contains(transform.getBound()))
             {
-                const osg::Polytope& polytope = _polytopeStack.front().second;
-
                 osg::Matrix matrix = _polytopeStack.back().first;
                 transform.computeLocalToWorldMatrix(matrix, this);
 
                 _polytopeStack.push_back(MatrixPolytopePair());
                 _polytopeStack.back().first = matrix;
-                _polytopeStack.back().second.setAndTransformProvidingInverse(polytope, matrix);
+                _polytopeStack.back().second.setAndTransformProvidingInverse(_polytopeStack.front().second, matrix);
 
                 traverse(transform);