> In addition, during the state transition, I would like to update the 
> tangent of friction angle for all interaction and not only "real" 
> interaction
> (from a discussion between Jerome and Bruno I understood that the 
> transition (isReal = 0 and isNew = 0) => (isReal = 1 and isNew = 0) 
> will not happen, but I would prefer to have several "protections" than 
> only one).
Interaction where isReal==false has no associated interactionGeometry 
and interactionPhysics. You could try modify those, but yade will segfault.

If you want to change friction angle for all future interactions, you 
have to adjust frictionAngle that is stored in physicalParameters of 
individual bodies and that is used to compute frictionAngle of 
interaction by InteractionPhysicsMetaEngine.

V.


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