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[Jan Stránský <question690234@xxxxxxxxxxxxxxxxxxxxx>]

Question #690234 on Yade changed:
https://answers.launchpad.net/yade/+question/690234

Jan Stránský proposed the following answer:
Hi,

@Robert
###
O.bodies.append((sphere((0,0,0),1),sphere((1,0,0),1)))
O.engines = [
   ForceResetter(),
   InsertionSortCollider([Bo1_Sphere_Aabb()]),
   InteractionLoop(
      [Ig2_Sphere_Sphere_ScGeom()],
      [],
      [],
   ),
   NewtonIntegrator(),
]
O.step()
###
terminate called after throwing an instance of 'std::runtime_error'
  what():  Undefined or ambiguous IPhys dispatch for types FrictMat and FrictMat.
Aborted (core dumped)

@Vincent
in general it would be possible, but I don't think easily with current implementation (haven't tried, thought). E.g. Interactions without IPhys are normally treated as non-real, I am not sure with consequences for your use case..
Would setting zero stiffness to materials be ok for you? Then the force computed would be zero and forces would be applied exclusively from what is set to O.forces..

cheers
Jan

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