Added UserData to NodeVisitor.
Added UserData to NodeVisitor.


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