That stereo version looked like fun, so a few minutes of tinkering with POV later....(also a cross eye stereogram)

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I changes the camera position slightly to get more shadow.

töff - the clouds do cast shadow, but they were a bit too close to the surface to show up. I increased the cloud elevation and opacity a bit this time.

Also- if anyone wants the (very simple) Povray source code for this scene, just let me know. All you have to do is change the bump and image map parameters, and you will get the same scene with your own planet.

-Rob A>