SIMD support...

[Sean Cavanaugh]

On 1/16/2012 7:21 PM, Danni Coy wrote:
>     (dual quaternions? Are they
>     used in games?)
>
> yes
>

While the GPU tends to do this particular step of the work, the answer 
in general is 'definitely'.  One of the most immediate applications of 
dual quats was to improve the image quality of joints on characters that 
twist and rotate at the same time (shoulder blades, wrists, etc), at a 
minimal increase (or in some cases equivalent) computational cost over 
older methods.

http://isg.cs.tcd.ie/projects/DualQuaternions/