Question #703130 on Yade changed:
https://answers.launchpad.net/yade/+question/703130
Status: Open => Answered
Karol Brzezinski proposed the following answer:
Hi Guo,
You can block all degrees of freedom, except for 'z'. Let's say 'b' is
your body, so:
b.state.blockedDOFs='xyXYZ'
the above code constrains body, and allows only for vertical movement
(capital letters control rotation).
Best wishes,
Karol
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