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[Christian Jakob <question221362@xxxxxxxxxxxxxxxxxxxxx>]

Question #221362 on Yade changed:
https://answers.launchpad.net/yade/+question/221362

    Status: Open => Answered

Christian Jakob proposed the following answer:
>Resulting:
>     mass_sphere1 = mass_clump1 = mass_clump2
>     inertia_sphere1 ≠ inertia_clump1 ≠ inertia_clump2
>Is that wrong? Does the adaptClumpMasses method take into account the overlapping 
>correctly to calculate the inertia?

I do not see any problem.

sphere2 = sphere4
sphere3 is completely inside sphere2 and sphere 5 is completely inside sphere4, so they have to have same clump masses.
if densities for all spheres are equal, the sphere1 should also have the same mass as both of the clumps.
that leads to:
mass_sphere1 = mass_clump1 = mass_clump2

inertia is not calculated correctly in this case, because for clumps it is calculated as sum of all inertias of clump members, so inertia_sphere1 should be different from inertia_clump1 and inertia_clump2.
in your case inertia for clumps is calculated too high. maybe some day this will be fixed/improved ...
the inertia of both clumps should be also different, because their geometry is different (different balance point of masses)

regards,

christian

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