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[Bruno Chareyre <question673023@xxxxxxxxxxxxxxxxxxxxx>]

Question #673023 on Yade changed:
https://answers.launchpad.net/yade/+question/673023

Bruno Chareyre proposed the following answer:
> clumping all my object facets, will they start to decelerate even if
they aren't directly in contact with the soil?

Yes they should.

The assertion failure (you are using a debug build are'nt you? else I think asserts would be removed)?  is because the cumulated mass of the clumped facets is zero.
You need 1/ to assign mass and inertia to each facet before clumping or 2/ compile without debug features so that you can  define mass/inertia of the clump after clumping.
Cheers
Bruno

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