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[Jan Stránský <question707124@xxxxxxxxxxxxxxxxxxxxx>]

Question #707124 on Yade changed:
https://answers.launchpad.net/yade/+question/707124

    Status: Open => Answered

Jan Stránský proposed the following answer:
> the id=3841 in the error report exceeds the number of particles I imported via yade
> However, I did not figure out where the contact parameters of the interface unit are defined when it is involved in the contact force calculation (in DEM)? 

The other bodies are imported "via yade", athough not directly.
Still you have access to the bodies as O.bodies[theProblematicID]

> Besides, the above reported error only appears when I defined FrictMat
in the script. When I define only PolyhedraMat and use only the
following engine, the problem did not occur.

If you use only PolyhedraMat, all the needed dispatchers for material-shape combinations exist.
For FrictMat and PolyhedraMat, you create a FrictPhys (Ip2_FrictMat_PolyhedraMat_FrictPhys) but at the same time from Facet and Polyhedron you create PolyhedraGeom (Ig2_Facet_Polyhedra_PolyhedraGeom).
And there is no Law2 for PolyhedraGeom and FrictPhys..

You have either implement the Law2, or choose such combination of
shapes, materials, Ip2 and Ig2 such that all resulting IGeom+IPhys
combinations can use existing Law2.

Cheers
Jan

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