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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> But you are not changing friction (frictionAngle), but stiffness (ks)?
> If you change frictionAngle, it will not affect current forces 
>
>   
Read the title of the original post? ;)
I have a clear increase/decrease of stress as a result of 
increasing/decreasing friction.
I think we agree now : it should not happen... the question is "why?".
Might be an algorithm problem OR a simulation problem (packing not at 
static equilibrium or something alike).

Bruno