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[Jan Stránský <question696056@xxxxxxxxxxxxxxxxxxxxx>]

Question #696056 on Yade changed:
https://answers.launchpad.net/yade/+question/696056

Jan Stránský posted a new comment:
> In my understanding, individual facets are of triangle shape and can
not move together. In my case I need the boundary of the sampler to move
together. Thus I have to clump them together.

ok, thanks for info, now we come to the source of the misunderstaing.
You do not need to clump facets at all :-)
Just create them to the shape you want and then you can translate / rotate them, together, but without the need of clumping them.
E.g. in the bulldozer example, TranslationEngine is used for this purpose.
Or you can just assign same velocity to all facets (they are not dynamic by default, so they will continue with the defined velocity).
You can also do some servo control to simulate force control of the facets (prescribing motion such that the resulting forces matches the prescribed force evolution).

If you need the complex shape as a one independent dynamic body, then
clumping is appropriate.

cheers
Jan

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