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[Jan Stránský <question677876@xxxxxxxxxxxxxxxxxxxxx>]

Question #677876 on Yade changed:
https://answers.launchpad.net/yade/+question/677876

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello Pawel,
the C++ seems ok. I think "if (I)" is not needed, would put "if(I->isReal())" instead, but don't know all the details.

adding this line to O.engines (basically printing O.iter when the interaction is real)
PyRunner(iterPeriod=1,command="if [i for i in O.interactions]: print O.iter"),
I got output:
3506
3507
3508
3509
3510
7839
7840
7841
7842
7843
7844
10835
10836
10837
10838
10839
10840
12857
12858
12859
12860
12861
12862
14274
14275
14276
14277
14278
14279

so the interaction is indeed not real most of the time, probably performing some kind of "micro-bouncing".
You can test the interaction reality and if false, using zero vectors for the forces.

cheers
Jan

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