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[Jerome Duriez <jerome.duriez@xxxxxxxxxxxxxxx>]

chiara modenese a écrit :
> Actually if one wants to test the shear direction it is not as 
> straightforward as for the normal part. I managed to do that having 
> viscous damping at contacts (so that, in a sphere-sphere interaction, 
> you first apply a force in the normal direction till you reach 
> equilibrium having a damped solution
Did you apply gravity ? Or any, say vertical, force (if normal of the 
interaction is vertical) applied by hand or with ForceEngine maybe. That 
is what I would advice you in order to have a normal force non equal to 
zero at the interaction. But I do not see the link with damping ?