Fixed build for when ref_ptr<> impicit cast is not built
Fixed build for when ref_ptr<> impicit cast is not built


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