Václav Šmilauer said: (by the date of Thu, 03 Jun 2010 21:50:52 +0200)
Oh sorry Vaclav - I didn't notice your reply! (thread switching in ML perhaps is bad.... sorry if you feel that it makes more mess, but now I will reply here). > > I wish there was some flag telling the quaternion to be a UNIT > > quaternion. The library should take care of all that normalizing. > > After all inside its own routines it is calculating length quite > > frequently. > They are supposed to be unit quaternions. Exactly for that reason I > guess Eigen _never_ computes the norm, as it is costly and it thinks it > is more or less unit. aha! good. It's faster! > The case for clumps was only for for construction of quaternion > construction from rotation matrix, normal quaternion operations (such as > multiplication) preserve unit length, modulo numerical drift, which is > the same for wm3. > > Just add a check if != 1.0 and if so, then perform > > a .normalize action. > Contact the Eigen guys, I am sure they will be very happy with that > optimization ;-) heh, so we agree. I said this at least 5 times today ;-) -- Janek Kozicki http://janek.kozicki.pl/ | _______________________________________________ Mailing list: https://launchpad.net/~yade-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
