I modified render settings using D3D dialog - this is about the best I can do. The render time increases dramatically and if the scene was not so ultra simple, it would probably use more than all the RAM I have.

This is the IDL precalc - observe the density of the IC samples points.

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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)