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[Klaus Thoeni <question244498@xxxxxxxxxxxxxxxxxxxxx>]

Question #244498 on Yade changed:
https://answers.launchpad.net/yade/+question/244498

Klaus Thoeni proposed the following answer:
Hi,

you have 3 materials but you are only defining 3 matches. In the most general case 3 materials have 6 matches, for your case it would be:
(rainId,rainId), (rainId,soilId), (rainId,wallId),
(soilId,soilId), (soilId,wallId),
(wallId,wallId)

You can eliminate a case if you are sure no contact between the two
materials will occur.

As I mentioned in my previous post the error tells you that the Ip2
functor can't find a match for a contact of material 2 with itself.
Assuming wallId=2 tells you that match for (wallId,wallId) is missing
and that's the case.

HTH
Klaus

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