One thing to note - the depth-cue effect in Poser is linear falloff, all the way to 0, which is not realistic. It makes the sub anim above look like the sub is materializing by passing through an opaque portal, instead of merely approaching the camera. True depth-based light transmission (such as fog or murky water) is actual an inverse linear effect, which never goes to zero at any distance, but approaches zero forever.

Some people don't notice things that are at least directionally correct, even if they are wrong in a numerical sense. This is the case with distance falloff. Some people notice, others don't. I notice very badly and it looks to me as bad as rendering without shadows.

If you find this a problem, I can show how to fix it.

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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)