Quote - This image is a Poser render of my surface (and short-dive-submersible) grab-dredger. The sea surface is the ground plane re-colored and 50% transparent (edge transparency = 0%); the deep sea beyond visibility limit is the background with color red=0, green=128, blue=255. How could I make the effect of underwater visibility decreasing with depth, while keeping the air above water level clear?

(The big hole each side in its bows is the inlet and exit of a bow thruster)

There are several ways to do this, none of which are obvious or great. Given that Poser lighting has real volumetric scattering ability, we have various cheats.

If you have most of the light coming from a single infinite for the sun, you can set it to provide less light as the depth increases below a certain level in world coordinates.

It is not obvious how you'd do this, but it's fairly easy once you know how.

I will show.

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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)