Question #229891 on Yade changed:
https://answers.launchpad.net/yade/+question/229891

Alexander Eulitz [Eugen] posted a new comment:
if I look at [2] I'll find:
"normalForce(=Vector3r::Zero())
    Normal force after previous step (in global coordinates)."
What does global coordinates mean?  I think that it is coordinates of the 
contact point. So normal force in direction of the contact (perpendicular to 
contact plane)

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