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.


XiaoCC/osg,artoolkit/osg,ntoand/osg,ghub/osg,XiaoCC/osg,koshman86/osg,stmh/osg,artoolkit/osg,stmh/osg,ghub/osg,XiaoCC/osg,ghub/osg,artoolkit/osg,omega-hub/osg,stmh/osg,omega-hub/osg,omega-hub/osg,ntoand/osg,ghub/osg,koshman86/osg,ntoand/osg,artoolkit/osg,koshman86/osg,koshman86/osg,stmh/osg,ntoand/osg,omega-hub/osg,XiaoCC/osg,stmh/osg,XiaoCC/osg