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[孙灿 <question699279@xxxxxxxxxxxxxxxxxxxxx>]

New question #699279 on Yade:
https://answers.launchpad.net/yade/+question/699279

How to set two concentric circles with the same center and different radius? I want to use these two circles to simulate the shield tail gap.
My code is as follows：
circleRadius=2
circleCenter = Vector3(30,40,0.1)

for b in O.bodies:
    d = (b.state.pos - circleCenter).norm() # distance of circleCenter and center of "b"
    if d < circleRadius:
        O.bodies.erase(b.id)
for a in O.bodies:
    s = (a.state.pos - circleCenter).norm() # distance of circleCenter and center of "a"
    if s = circleRadius:
        O.bodies.append(a.id)
What's wrong with my code?

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