Attached Link: Thread Link: Looking for sand displacement/bump map

I had the same problem. I never figured out what it was. I was using a single sided square. But with a good sky dome and busy water, people don't notice the artifacts any more. I did some experiments to isolate the factors but it's a really complicated bug. There is clearly something wrong with Poser's reflection and/or refraction code. I don't understand why it has so much trouble - these are 25 year old techniques.  The raytracer in POV-ray never has these kinds of stupid problems with reflection and refraction. If only Poser scenes would import into POV-ray more easily. I'd use it if complicated materials would get translated into POV-ray code for me, but they don't. Sigh.

Anyway, if you look at the linked thread, you'll see a link to my final image in the gallery, as well as all my materials for water, sand, and surf. You may find them useful.

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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)