Question #403534 on Yade changed:
https://answers.launchpad.net/yade/+question/403534
Status: Open => Answered
Klaus Thoeni proposed the following answer:
Hi Luc,
what do you mean by invisible? No interaction between certain particles?
In that case I would try mask/groupMask [1].
HTH
Klaus
[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Body.groupMask
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