Most animation format's don't suport pendulum as far as I know. You can set Bryce to pendulum, but when you render it into an Avi file the resulting file doesn't have a pendulum animation (or at least, my media players don't make it a pendulum). I think GIF supports pendulum. You could just render your animation and set the pendulum option in a video-editing program. I hope this answers your question.

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