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[Jan Stránský <question691701@xxxxxxxxxxxxxxxxxxxxx>]

Question #691701 on Yade changed:
https://answers.launchpad.net/yade/+question/691701

    Status: Open => Answered

Jan Stránský proposed the following answer:
using utils auxiliary functions, like utils.sphere or utils.facet
(usually called without the utils. prefix), reference position
(state.refPos) is set the same as given position (state.pos).

In the case of facet, you pass vertices. The state.pos  and state.refPos
is the center of inscribed circle. So once you know vertices, it just
some geometry calculations.

For implementation, see [1,2]

cheers
Jan

[1] https://gitlab.com/yade-dev/trunk/-/blob/master/py/utils.py#L267
[2] https://gitlab.com/yade-dev/trunk/-/blob/master/py/_utils.cpp#L175

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