Hi all - just a quick note to let you know I haven't forgotten about this. It got me thinking about some other things, such as how the light should decrease with increasing depth, as well as with distance, and how the scattering from particles should appear.

Here's a little demo of where I'm at. The water surface is 200 feet above the bottom (ground). You can see sky through it. Notice the area of total internal reflection. But! There's an anomaly due to the fact that reflections of the distant areas, which should be dark, come from the surface which is much closer. The Atmosphere effect does not respect the total distance that info has traveled - it only deals with the direct distance between the surface and the camera. I'll have to fix that with some more math - seriously complicated math.

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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)