> (Don't use Newton::gravity though, it breaks something in your > script and I'm still investigating). > It is not related to the new Newton::gravity, it only revealed another bug in eigen's quaternions. In your script, Klaus, the clump sometimes disappear, did you notice? It is because the axisAngle conversion of clump members orientation is nan from time to time (especially just after impact, when the roation of the clump is very small). For some reasons, this feature breaks the time integration when the gravity engine is removed and replaced by Newton.gravity=-9.81. Adding a GravityEngine in the loop with gravity=(0,0,0) fixes the problem, although it doesn't touch orientation at all... I'm really scared of eigen's quaternions. It's not the first time they give weird behavior.
The conclusion is: if you have problems with clumps rotations, add a null gravity engine in your simulation... :( Bruno _______________________________________________ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
