To stop the clouds from moving you have to set the windspeed or cloudspeed (whatever it's called) in the skylab to 0. I've tried some character animation in bryce. It's fun, but time consuming. I made a dancing alien scene of about one minute and it took a whole day. From 8:30 in the morning to 11:30 in the evening. It was all done as stop-motion and the animation wasn't fully in-sinc with the BPM of the music, but it looked really funny. But the biggest downside to animations are the rendertimes.

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