Darren New <dne### [at] sanrrcom> wrote:
> (*) Of course, he's speaking of quaternions as implemented in the software
> library he's describing. I don't know how general this usage is.
>
From what I remember, only unit quaternions (those one unit long) are used for
these kinds of 3D rotations.  I had to avoid those libraries when looking for
code to implement operations valid for any quaternion.

Also, according to the POV-Ray source, "This module implements Quaternion
algebra julia fractals."

povray-3.7.0.beta.35a/source/backend/math/quatern.cpp

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