[fluxus] skinning and pfuncs

[Dave Griffiths]

> hi dave amazing things, perhaps you want to check out this as this
> subject is fresh on your mind and still changing, blender has just
> implemented this kind of skining method:
> http://isg.cs.tcd.ie/projects/DualQuaternions/
>
> also this a method to calculate weights based on heat
>
> http://www.mit.edu/%7Eibaran/autorig/
>
> i think i should had sent this earlier for you :(.

The implementation I've done is the simple classic approach - I suppose
the idea is that using pfuncs we can have as many approaches to this sort
of thing as we want (not locked into one way).

The DualQuaternion system looks very quick to try out - I'll give it a go
at some point. The next thing I want to look at though, is how to make
dealing with scenegraph subtrees easier - some skeleton utility type
things.

cheers,

dave