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[Kneib François <1273172@xxxxxxxxxxxxxxxxxx>]

I noticed that it seems to happen only when the spheres are geometrically tangent or nearly tangent (you can try this by modifying the radius into the script).
I looked at the code and the problem seems to come from the "updateProperties()" method, it seems that "state->ori" is NaN. It comes from the inertia tensor eigen vectors, if some values are NaN (see the comment line 205 : "has NaNs for identity matrix??").
As this is a *very* special case, I change the bug importance. 

** Changed in: yade
   Importance: High => Low

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https://bugs.launchpad.net/bugs/1273172

Title:
  Clump size limited to 256 bodies.

Status in Yet Another Dynamic Engine:
  New

Bug description:
  Hi,

  I noticed that there is a limited number of bodies you can add to
  clump::members : 256. Whatever method you use, if you put 257 members
  into a clump, the c++ map "members" will have the right number of keys
  (257), but all corresponding values of Se3r will be set to "nan". If
  you create a clump of 256 bodies, it will be ok first, but if you add
  one more body all clump members will be corrupted (see the script
  attached).

  I think the problem doesn't come from the "map" type of C++ or the
  "dict" type of python, because they always have the right size, even
  if the clump size exceeds 256. It looks like a variable doesn't have
  sufficient memory allocated and I really wonder where ...

  Does someone have an idea ?

  Thanks

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