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[Bruno Chareyre <question226978@xxxxxxxxxxxxxxxxxxxxx>]

Question #226978 on Yade changed:
https://answers.launchpad.net/yade/+question/226978

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
The force applied by id1 on id2 is (i.phys.shearForce +  i.geom.normal *
i.phys.normalForce)

So your question is equivalent to "is id1 always smaller than id2?"

for i in O.interactions:
    if i.id1>i.id2:
        print "hehe"

...
hehe
hehe
hehe
...

You will have to check I'm afraid, or maybe check if id1<id2, else
revert.

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