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[Jerome Duriez <duriez@xxxxxxxxxxxxxxx>]

Thanks for the answer. A still curiosity question about the same topic 
(consequently, I didn't break the thread) :
- in InteractingBox2InteractingSphere4SpheresContactGeometry, the choice 
is made to set for the box a value of radius (which will be used to 
compute rigidities) equal to 2 times the radius of the in-contact sphere.
Is there a reason to choose this "2" ??