Le Fri, 26 Sep 2008 21:40:57 -0700, Dan Connelly a modifié des petits
morceaux de l'univers pour nous faire lire :

> And my degrees of freedom argument follows only if one is allowed a
> single rotation and a single scaling.  But generating pure shear
> requires two rotations.
> 
> Sorry....
> 
> Dan

Might I remind people that the internal transformation matrix is a 4x4, 
using weighted coordinates system (x,y,z,w).
Successive transformations are stacked together by matrix-multiplication 
at parse time.

Now, I would be interested in seeing a screwing transformation-matrix...
Please enlight-me

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