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Contact forces



In the script file 


I don't understand why the interaction forces are shown only in the
range [-90, 90] whereas the componnents of the contact's normal ny and
nz ranges both in [-1, 1].
I think that the force interactions belonging to the side [90, 270] are
superposed with these belonging to [-90, 90] (because the division of
nz/ny which gives a positive value when nz and ny are both negative for

Actually we expect some symmetry in such presentation but it still

In addition, for my study case I displayed the interaction forces
histogram and I found that I have an important interaction forces
concentration near the angles 0, 90 and -90. Can somebody tell what is
the problem ?? 

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