Question #240275 on Yade changed:
https://answers.launchpad.net/yade/+question/240275
Status: Open => Answered
jduriez proposed the following answer:
Hi,
Use mask =3 (=11 in binary) for your bodies 1 and 3.
In this case it still has one bit in common with other bodies 0 and 2
(where mask=1 = 01 in binary), so bodies 1 or 3 may interact with bodies
0/2. Masks do not have to be strictly equal so that bodies interact.
And, if I'm right, collider.avoidSelfInteractionMask can in fact in this
case still be equal to 2 (=10 in binary) because it has one bit in
common with 3
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