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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Chiara, I found a problem in the script you use for comparing energies 
in bouncing spheres.
The line O.materials[0].frictionAngle=radians(25) is changing value in 
the material but it is not reflecting everything automaticaly in 
interactions (tangent of friction is still 0 in the contact law, but 
radians(25) is used for computing energy, so...).
By using TriaxialCompressionEngine().setContactProperties(radians(25)) 
instead, I get something better. Total energy is still increasing, but 
at least it will stagnate at a point.

Bruno

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