Question #403534 on Yade changed:
https://answers.launchpad.net/yade/+question/403534
Status: Open => Answered
Klaus Thoeni proposed the following answer:
Not sure if there is a good example. Long story short it is a bit wise
comparison. Here a short example assuming three bodies:
O.bodies[0].mask=1 # 00000001 -> corresponds to 1 in the binary system
O.bodies[1].mask=2 # 00000010 -> corresponds to 2 in the binary system
O.bodies[2].mask=3 # 00000011 -> corresponds to 3 in the binary system
In this example, O.bodies[0] and O.bodies[1] would not interact whereas
O.bodies[2] would interact with both.
HTH
Klaus
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