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[Jan Stránský <question690366@xxxxxxxxxxxxxxxxxxxxx>]

Question #690366 on Yade changed:
https://answers.launchpad.net/yade/+question/690366

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi,

> why the branch vector is not the same as the contact normal?
> contact normal is: Unit vector 

you answered yourself
i.geom.normal is normalized (unit) vector from the branch vector (for the case of sphere-sphere contact)

> i mean which one should I choose.

consistently with which one force you choose (applied on body1 or body2)

cheers
Jan

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