Jerry Anning wrote:

> You can't apply built in vector ops to homebrew 4d vectors as it is.
> This means that you have to do it explicitly with (slow) macros.  With
> 4d position vectors, you can easily program things that use homogenous
> coordinates (i.e. rational splines, making homebrew NURBS reasonably
> easy).  The image map thing is just a matter of an extra line of pov
> code, 4d (and more) vectors make whole new capabilities feasible.
>
> Jerry Anning
> cle### [at] dholcom

  I will concede the point but not my desires.

Ken Tyler

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