Hi Laura,
> I've changed the IterPeriod and the value of O.force, and works ok. > I believe it works, but I would not use it this way :-) b.state.vel(id_ball,(1,0,0)) > Error: b.state.vel(id_ball, (10,0,0)) > TypeError: 'Vector3' object is not callable the syntax should be: b.state.vel = (1,0,0) use this line only once in the beginning of the simulation (preferably do not use PyRunner). Otherwise it would overwrite the vertical component of the motion. (To test it, you can use PyRunner as you have it now with initRun=True and iterPeriod=someVeryBigNumber) cheers Jan
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