Added ref_ptr<> usage to avoid possible memory leak.
Added ref_ptr<> usage to avoid possible memory leak.


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