From 490fc96ea613294475cb137433327b90f8fbb197 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 3 Oct 2006 20:20:23 +0000
Subject: [PATCH] From John Aughey, "Attached is the Optimizer.cpp file that
 has the fix to duplicate vertex and normal arrays if there is more than one
 reference to the data.  This fixes the problem where the transforms are
 applied to the same vertex array multiple times if that vertex array is
 re-used within the model. "

---
 src/osgUtil/Optimizer.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/osgUtil/Optimizer.cpp b/src/osgUtil/Optimizer.cpp
index 19263d158..3b84e8f9c 100644
--- a/src/osgUtil/Optimizer.cpp
+++ b/src/osgUtil/Optimizer.cpp
@@ -1096,6 +1096,16 @@ void Optimizer::FlattenStaticTransformsVisitor::apply(osg::Geode& geode)
     {
         for(unsigned int i=0;i<geode.getNumDrawables();++i)
         {
+            osg::Geometry *geometry = geode.getDrawable(i)->asGeometry();
+            if(geometry)
+            {
+                if(geometry->getVertexArray() && geometry->getVertexArray()->referenceCount() > 1) {
+                    geometry->setVertexArray(dynamic_cast<osg::Array*>(geometry->getVertexArray()->clone(osg::CopyOp::DEEP_COPY_ALL)));
+                }
+                if(geometry->getNormalArray() && geometry->getNormalArray()->referenceCount() > 1) {
+                    geometry->setNormalArray(dynamic_cast<osg::Array*>(geometry->getNormalArray()->clone(osg::CopyOp::DEEP_COPY_ALL)));
+                }
+            }
             _drawableSet.insert(geode.getDrawable(i));
         }
     }