From Gideon, update to the PolygonOffset for the background quad.
From Gideon, update to the PolygonOffset for the background quad.


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