Hi GG, I'm not the author of osgFX::Outline so the only way for me to give you more information would be to reach through the code myself and then pass on my interpretation. This is something you can do too, and would recommend as you are the one that wants to learn about it.
As a general note, osgFX is very old part of the OSG and hasn't been touched much since it was written. It was written prior to the development of modern OpenGL features so if I were to write effect these days I would write them from scratch rather than rely upon osgFX. Robert.
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