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Hi evrybody !
we can display an interaction between shperes in Yade by specifying its
number with O.interactions, which gives (id1,id2).
Now if we look for example for the normal vector or the normal force,
does it correspond (via the convention used by yade in displaying
contact ids) to the force of id1 applied on id2 or inversely ?
(same question for the normal vector)
Just to make sure before further proceedings :)