I agree we need SSS for perfect photorealism. Nevertheless, the departure from reality has been decreased by GI, a lot. There will always be some departure from reality. If you want it 10 times smaller, we need to use another renderer. We could wish that the SM engineering team was 30 people, but it isn't. As far as I know, pretty much one guy wrote all the new renderer stuff. You want them to put 5 people on rendering technology improvements, then be prepared to pay $800 per copy.

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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)