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[Bruno Chareyre <1475844@xxxxxxxxxxxxxxxxxx>]

I don't understand this assert either.
Just adding more questions:
-Can the same problem also appear in Ip2_FrictMat_CpmMat_FrictPhys?
-This one requires that mat1 is Frict and Mat2 is Cpm, how can it be always true? [4]

The good fix would be to let materials be swapped, I don't believe it
really needs two different functors.

[4] http://bazaar.launchpad.net/~yade-pkg/yade/git-
trunk/view/head:/pkg/dem/ConcretePM.cpp#L25

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https://bugs.launchpad.net/bugs/1475844

Title:
  Swap problem in InteractionLoop

Status in Yade:
  New

Bug description:
  When you use two different materials, it might happen that
  IntreactionLoop ends with error [1]. It is because of IPhys stage (see
  also the comment in [1], but in reality Ip2 can by non-symmetric).

  Possible solutions:
  1) define both Ip2_Mat1_Mat2 and Ip2_Mat2_Mat1 (according to [2] maybe does not work..)
  2) replace assert [1] (something like   if (swap) { I->functorCase.phys=physDispatcher->getFunctor2D(b2->material,b1->material,swap); swap=false }). Is the assert necessary at all?
  3) make option 1) somehow automatic (using some macro?)

  Pros and cons:
  1) would mess the source code and documentation a bit, but otherwise I think it is ok
  2) would it have some side effects? Is it ok for Law2 stage? etc etc?
  3) maybe the best option if the solution is reasonable

  cheers
  Jan

  [1] http://bazaar.launchpad.net/~yade-pkg/yade/git-trunk/view/head:/pkg/common/InteractionLoop.cpp#L116
  [2] https://answers.launchpad.net/yade/+question/269315

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