Re: find the rotation matrix between two vectors

[Bob Odom]

Octave-Forge has a quaternion package, but I haven't used it.

http://octave.sourceforge.net/quaternion/index.html


On Tue, 27 Apr 2010, James Sherman Jr. wrote:

> The most intuitive way for me is to first axis-angle representation of the
> rotation, then convert it to a quaternion.
>
> To get axis-angle is fairly straightforward, the inner product of the two
> vectors is the cosine of the angle, and the cross-product gives the axis
> (just need to normalize).
>
> Then, to convert to quaternion, its pretty straightforward as well, but the
> formula is found in (of many places) Axis-angle
> article<http://en.wikipedia.org/wiki/Axis_angle>or
> here<http://www.euclideanspace.com/maths/geometry/rotations/conversions/angleToQuaternion/index.htm>
> .
>
> There is also several libraries, if you can't find any for octave
> specifically, written for Matlab may work with octave.  Some are GPL even,
> if you are concerned about that.  Search for "quaternion for
> matlab"<http://www.google.com/#hl=en&source=hp&q=quaternion+for+matlab&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=4f910945c1ee36d4>
>
> Hope this helps.
>
> On Tue, Apr 27, 2010 at 7:18 AM, Junqian Gordon Xu <address@hidden> wrote:
>
> > I'm trying to find the rotation matrix or quaternion from two unit
> > vectors A and B, then to apply the rotation to a third vector C.
> >
> > I played with the quaternion package on octave-forge, but the
> > documentation is not complete and the `demoquat` does not work well
> > under 3.2.4.
> >
> > My knowledge of quaternion is quite limited. Does anybody have any
> > suggestion on how to achieve this easily in octave?
> >
> > Thanks
> > Gordon
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