Made the inheritance of osg::Object in the DrawCallback to be virtual.
Made the inheritance of osg::Object in the DrawCallback to be virtual.


tomasthoresen/osg,tomasthoresen/osg,openscenegraph/osg,scrawl/osg,openscenegraph/osg,marchelbling/osg,marchelbling/osg,tomasthoresen/osg,scrawl/osg,jtorresfabra/osg,jtorresfabra/osg,jtorresfabra/osg,openscenegraph/osg,scrawl/osg,tomasthoresen/osg,artoolkit/osg,jtorresfabra/osg,openscenegraph/osg,artoolkit/osg,artoolkit/osg,marchelbling/osg,marchelbling/osg,artoolkit/osg,scrawl/osg