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[Jérôme Duriez <question693506@xxxxxxxxxxxxxxxxxxxxx>]

Question #693506 on Yade changed:
https://answers.launchpad.net/yade/+question/693506

Jérôme Duriez posted a new comment:
You can also realize that geom.normal is from i.id1 to i.id2 [1]
(whether i.id1 is b.id = 10 or 20 in a 10-20 contact being indeed
collider-dependent), and that contact forces are from i.id1 onto i.id2
[2]

This insures the given sign for the dot product, in accordance with the
repulsive (compression) or attractive (tension) nature of the force.

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.ScGeom.normal
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.FrictPhys.normalForce

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