TG, Poser's IDL is a cheat and cannot be pushed beyond certain limits. The price we pay for speed.

You cannot use super bright small props for light. Poser does not send out enough rays to find them all from all positions, so here it hits, there it misses. You get splotchies.

 

Use bigger props for light sources. The new system allows us to make these invisible and keep the smaller ones to look at directly!!!

 

If you really want to do that sort of render, with a small 5 inch sphere lighting a large area, use LuxRender and Pose2Lux. Oh - and be prepared to render for up to 40 or 50 hours.

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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)