Question #680868 on Yade changed:
https://answers.launchpad.net/yade/+question/680868
Status: Open => Answered
Jérôme Duriez proposed the following answer:
Hi,
Above [1] says that you can not really predict *beforehand* which body
would be labelled as 1 (or 2) in the contact treatment, however, for a
given body and a given contact the body participates into, you still can
* check whether that body is id1 or id2 for that interaction
* then, know without ambiguity the "direction" of the force since that force is
usually in YADE (if not always) "from id1 to id2". It is like that in
particular for NormShearPhys and derived classes [*,**]
So it's possible to measure resultant contact force looping over contacts. If
the body sustains only contact forces (no gravity), the resulting contact force
also corresponds to O.forces.f(idOfBody)
[*]
https://yade-dev.gitlab.io/trunk/yade.wrapper.html#yade.wrapper.NormShearPhys.normalForce
[**]
https://yade-dev.gitlab.io/trunk/yade.wrapper.html#yade.wrapper.NormShearPhys.shearForce
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