Hi Bruno, answering here not to pollute the original question [1].
You can impose the velocity of the piston as b.state.vel=(x,y,z) after > setting b.state.blockedDOFs='xyzXYZ'. You then make it zero in the begining > and change for something else at some point. > TranslationEngine makes this simple thing excessively complex in my > opinion. I would suggest to forget it (*). > Bruno > (*) and even to remove it from source code for its anti-didactic effect, > to keep only truly involved helico-rotational motion engines present I agree that for single body / a few bodies, blockedDOFs + setting vel is much more easier and that TranslationEngine has anti-didactic effect. I disagree with removing it from source code (if you don't mean just examples, there yes). TranslationEngine is IMO more appropriate for multiple bodies. You can also use dead=True/False easily etc. Also it is useful for CombinedKinematicEngine (although a new very general kinematic engine altering current functionality could be implemented). cheers Jan [1] https://answers.launchpad.net/yade/+question/671132
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