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[Bruno Chareyre <question694548@xxxxxxxxxxxxxxxxxxxxx>]

Question #694548 on Yade changed:
https://answers.launchpad.net/yade/+question/694548

Bruno Chareyre proposed the following answer:
At impact time the forces are the same on nodes 7 and 8 while based on the symmetry it should be the same on 8 and 9 instead.
Really looks like at some point the ordering of the nodes is failed. Now it needs to find how.

In [1]: O.forces.f(7)                                                                                                                                                                            
Out[1]: Vector3(266280.2931349052233,23.39075633919068764,-20.63102091593614418)

In [2]: O.forces.f(8)                                                                                                                                                                            
Out[2]: Vector3(266198.2480056955828,23.58386741905894368,-21.62634969041041444)

In [3]: O.forces.f(9)                                                                                                                                                                            
Out[3]: Vector3(1242204.077827499015,115.5724137135645435,-101.9188704456528143)

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