Not a good one. I can do it, but there are subtle differences in the refaction versus the transparency. The delta shows up as artifacts. It used to work better. There must be recent changes in refraction.

I started to put one together but I got a call from work people and I threw it away. I'll have to start over, but I'm not sure it's worth the trouble.

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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)