I'm sure someone has already tried this, but I haven't seen it yet, so
I'm bringing it here.

The cloud technique is fairly straight forward; a black hole warp is
used to displace shaded areas away from the light source. The pigment is
applied to a curved cloud plane and lit by ambient light. Although I was
using MegaPOV, the method does not depend on it. 

The calculation sky colors based on sun elevation is sort of am
empirical hack. Not very straight forward, it still needs alot of work.

Anyway, the thing to look at is the lighting of the clouds in relation
to the sun.

Abe

P.S. The thing in the water on the lower right - don't ask me what it
is, I don't know. It just sort of showed up...thought it might be a
whale or something.

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