Anton Gladky пишет: > Hello all! > > I have a quaternion question. > I have two of them: > Q1 (0, 0, 1, PI/4) (around axis OZ) > Q1 (0, 1, 0, PI/6) (around axis OY) > My box should be rotated using first quaternion, and the a second one. It is > a new topic for me. Can anybody advice me, what should I do to solve this > task? You can product them: if M - first rotation and Q - second rotation, then final rotation R is R = Q*M = (q0+q)*(m0+m) = q0 m0 - q Dot m + q0 m + m0 q + q Cross m, where q and m is the vector part of quaternions; q0 and m0 is the its scalar part.
I don't know if there is quaternion product from python in YADE (Vaclav?), but from c++ it is simply as: Quaternion3r Q,M,R; R = Q*M; ps. Also you can see formulas and references in Appendix of my PhD thesis (in russian): http://dl.getdropbox.com/u/714488/DorofeenkoPhD.pdf _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
