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[Bruno Chareyre <question256357@xxxxxxxxxxxxxxxxxxxxx>]

Question #256357 on Yade changed:
https://answers.launchpad.net/yade/+question/256357

Bruno Chareyre proposed the following answer:
> PyRunner(command='addForceEver()',iterPeriod=1)

The above makes no sense. If the force is applied forever, why would we
reapply at each iteration? It is only when using addF(...,False) that a
PyRunner may help.

Does this solve your question?:

O.forces.addF(id_ball, F1,1)
O.run(100,1)
O.forces.addF(id_ball, F2,1)
O.run(100,1)

It applies F1 for 100 iterations, then F2. More automatic switches can
of course be implemented.

@Ricardo
I think ForceEngine would make this more painful. It does not offer any help for changing force values dynamicaly over time, and applying forces independently on 1000 bodies would need 1000 independent ForceEngines...

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