yade-users team mailing list archive

[Václav Šmilauer <eu@xxxxxxxx>]

OK, after some thinking and skyping w/ Chiara:

I will remove displacements and rotations in ForceContainer, and replace 
them by one-time velocity and angularVelocity: they will be added to 
state->vel and state->angVel in NewtonIntegrator, but reset by 
ForceResetter; and they can accumulate, just like forces do.

Further, Body::isDynamic will change its meaning to be simply 
state->blockedDOFs=State::DOF_ALL. Remembering that blockedDOFs block 
forces (not displacements per se), therefore, "non-dynamic" bodies 
_will_ be moved by NewtonIntegator if they will have non-zero velocity! 
That might break existing simulations, but now is the right period to do 
that (and see also shamefully long-lasting 
https://bugs.launchpad.net/yade/+bug/398089). I will also modify 
TranslationEngine accordingly, and will add regression tests to make 
sure two TranslationEngines can be combined and so on. That will ensure 
that the behavior will be consistent in the future.

Comments (besides that it should not change because it will break old 
simulations, please; run those with frozen version of yade)? (->yade-dev)

Cheers, v.