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[Jerome Duriez <duriez@xxxxxxxxxxxxxxx>]

Hello Vaclav, thanks for your answer, I think you mixed two normals (the 
one of the plane, and the one of the interaction) in your answer here :

> The (dot1<0.?1.:-1.) only determines the sense from id1 to id2 based 
> on the normal, and normal is always from id1 to id2.

But I think I've finally got it ! Thanks,

Jerome