Added call to ClusterCullingCallback to determine if the Terrain node is culled by cluster culling.
Added call to ClusterCullingCallback to determine if the Terrain node is culled
by cluster culling.


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@7806 16af8721-9629-0410-8352-f15c8da7e697

joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg