
First, create your scene as though it was above ground. Don't
bother with sky settings, because they will just get changed around later.
Go into the sky & fog editor. Change the fog, haze, and ambient
colors to various shades of the color of your water, in this case green.
The fog color should generally be darker than the haze color, but feel
free to experiment with all three. They should all be different, however,
to simulate more of a color shift. Raise the haze setting all the way to
100. This will create the actual appearence of water. Raising the fog will
create a "murky" feeling along the bottom of your scene. The settings I
used for the fog were (72 86.) The first number is density and the second
number is height, but it is best just to move them around and see what
looks best in each case. The shadow level should be set fairly high in
order to cause the colors to have more of a shift.
The cloud cover and height should both be fairly high. This lets less
sun through and and the sun that does get through is in varied intensities
and places. Both colors should be fairly dark for the same reason. I
recommend setting the sun color itself, to a color similar to your water
color, but a little brighter.
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