Added test code for nesting a <hull> within a volume tag.
Added test code for nesting a <hull> within a volume tag.


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