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[Václav Šmilauer <eudoxos@xxxxxxxx>]

>             GLUtils::GLDrawArrow(contPt,contPt
> +ss->normal*.5*ss->refLength); // normal of the contact
> 
> How do I activate it to display in GUI?

yade.qt.Renderer()['Interaction_geometry']=True
Gl1_Dem3DofGeom_SphereSphere(normal=True)

(the first you can do from the gui, the 2nd, you can not)