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[Bruno Chareyre <question695558@xxxxxxxxxxxxxxxxxxxxx>]

Question #695558 on Yade changed:
https://answers.launchpad.net/yade/+question/695558

Bruno Chareyre proposed the following answer:
I tried you example (nice one!) and I did not see something obviously
wrong.

It looks a bit like a ball-on-a-tip problem. This triangular object has
to fall one way or the other since it is in very unstable equilibrium,
so I'm not surprised that it rotates (which doesn't mean there is no
problem, maybe you have more insight?).

Note: there is a display problem which makes it look as if the clumped
objects were splitting appart. It goes back to normal when you pause the
simulation. Nothing to worry about. (reason is: the cylinders are not
dynamic objects and there orientation is not used anywhere in the code,
so it is not updated at runtime - only when 3D view is refreshed
orientation is recomputed for display).

Bruno

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