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[Bruno Chareyre <question248869@xxxxxxxxxxxxxxxxxxxxx>]

Question #248869 on Yade changed:
https://answers.launchpad.net/yade/+question/248869

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
Is there something special hapening to state-ori before step 154675
(manipulation in the script, some specialized clump functions, etc?),
because orientation quaternion seems very badly normalized.

A rotation matrix should be skew-symmetric, here you have:
A: 0.934319 -0.193747 0.299181
 0.188102 0.980983 0.0478483
-0.302762 0.0115711 0.952996

I'm not sure it is related to your problem, but it is very strange. Orientation is normalized at the end of leapfrogAsphericalRotate, so it should be ok at the next step. But again at step 154676 it does not give a good rotation matrix.
Something happening at each step, before Newton?!

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