Might have found a Poser bug. Switch GC off, render, then GC on, render, I get different results than if I load and render with GC on.

Something about the Background shader or an empty scene means a repeat render with GC switched doesn't work right.

The prop-based one works right every time.

And the Background-based one works as long as you don't switch GC without loading a prop.

x-post: This shader ignores lights. Nothing to do with it. Render without lights - same thing.

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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)