Question #705414 on Yade changed: https://answers.launchpad.net/yade/+question/705414
Jan Stránský posted a new comment: Hello, just a clarification and tips. (you have solved the problems, but others may come here searching same or similar topics) > When I try to access the components of this quaternion using q[0], q[1], > q[2], q[3]; it returns .... The individual components are different than that is in the Quaternion. q[index] returns actutal quaternion components (a,b,c,d in [1], sometimes also denoted w,x,y,z) I am not sure with the order (component "a" is q[0] or q[3], but it is documented in Eigen). > t = q.toAngleAxis() > One can easily access the components now. t[0][0], t[0][1], t[0][2] are the > i,j,k values of the quaternion, and t[1] is the angle. for t = q.toAngleAxis() t[0] is angle, t[1] is axis for t = q.toAxisAngle() t[0] is axis, t[1] is angle (you have it somehow mixed) A more pythonic and understandable code would be: axis, angle = q.toAxisAngle() or even (i, j, k), angle = q.toAxisAngle() Cheers Jan [1] https://en.wikipedia.org/wiki/Quaternion -- You received this question notification because your team yade-users is an answer contact for Yade. _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
