Added rainer's changes for adding billboard glow around sun.
Added rainer's changes for adding billboard glow around sun.


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