Hi, Is the "normalize" function from wm3 used currently in Yade? I mean not in specific packages your are developing at the present time but in some basic and usual computation made in Yade. I think for instance to the computation of the normal vector defining the intergranular contact plane (for the DEM), or something else. If yes it could a real problem...
Bruno have you got an idea of the default value of the "tolerance" value? The reason for this check could be to avoid a division by zero or "something" to close to zero. Luc Bruno Chareyre a écrit : > Hello > > Be aware that if you use the "normalize" function from wm3, it might > give the result (0,0,0) if the norm of the vector is smaller than a > "tolerance" value. > It sounds very strange to me, as I see no reason for this check, and I > was wondering if it could not cause problems in some cases, when a > "normalized" vector has length 0... > Janek had this problem when defining the normal of some triangular > facets (of small size) by normalizing the cross product of edges vectors. > I prefer not to be the only one thinking about this potential problem, > which probably needs a fix. > > A few ideas from a discussion with Janek : > 1- possibly fix minWm3 so that the test vs. tolerance is removed > 2- display a warning to the user when the tolerance is hit and the > vector is "rounded" to (0,0,0) > 3- run batch tests with/without the tolerance test > > Bruno > > > -- Luc Sibille Université de Nantes - Laboratoire GeM UMR CNRS IUT de Saint Nazaire 58, rue Michel-Ange - BP 420 44606 Saint-Nazaire Cedex, France Tel: +33 (0)2 40 17 81 78 _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp _______________________________________________ yade-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/yade-users
