Question #700369 on Yade changed:
https://answers.launchpad.net/yade/+question/700369
Status: Needs information => Open
孙灿 gave more information on the question:
Hello! I'm sorry I didn't explain myself clearly. I want to simulate a
hollow circle. A hollow circle means that there are many particles whose
center lies on the circumference of another circle. The particles form a
new circle.
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