How to calculate the rotation form X.Y.Z.W ?

mjd3d · **Joined:** 13 Sep 2011, 22:31 **Posts:** 21

I have got 4D vector from my motion capture like XYZW for each joint so
I just want to know how to calculate the rotation for this joint?

Thanx in Advance

Hirazi Blue · **Joined:** 04 Jun 2009, 12:15 **Posts:** 3203

Not quite the expert myself, but I think one of the two ways illustrated below (for convenience's sake incorporated in one screenshot), depending on the question if you want a "rotation" or a "quaternion"...

Attachment:

4d_vector_to_rotation.png [ 45.95 KiB | Viewed 312 times ]

dwigfor · **Joined:** 17 Nov 2009, 18:46 **Posts:** 292

Not sure why my post didn't come thru. Hirazi beat me, but here's my text reply..

4d vector should be same as Axis and Angle. So w would be the angle that rotates around a vector xyz.

How to calculate the rotation form X.Y.Z.W ?

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