I found the thread, but RDNA recently went through yet another re-build using another technology, and now the existing threads are pretty much ruined and nearly useless.

I feel so foolish investing so much time writing in the Node Cult forum at RDNA - the information is very nearly lost now.

http://www.runtimedna.com/forum/showthread.php?32342-Olivier-s-Ghost-FX-Tutorial

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)