yade-users team mailing list archive
Mailing list archive
Re: Combining engines prescribing movement
Hi Jan, you could combine engines, just put the one after another in
O.engines, with the same ids.
is it possible to combine more engines prescribing movement? for example (I know there is HelixEngine implemented, but suppose for a while it is not :-) if I want to combine translation and rotation to create a helix, can I somehow combine them, or for every such combination would I need to implement new engine?
Though looking at the code it is not clear to me how they work. E.g.
TranslationEngine updates position and changes velocity as well. That
means that the motion will be applied twice, unless the body is
non-dynamic...?! Someone could comment on that? Am I overlooking something?
If I see it right, the combination would work "fine" on non-dynamic
bodies (such as facets, which carry no mass), except for the velocity
which would be bogus (the second engine would overwrite velocity of the
Clearly, to make combination of such engines seamless, they would have
to change velocity, but in such a way that this change only applies in
the current step -- say adding vel and angVel to ForceContainer --
beside force, torque, displacement and rotation that we have already. Or
perhaps displacement and rotation could be replaced by vel and angVel
value, since displacement and rotation can always be obtained by
vel=du/dt. What about that?