in news:3c792e92@news.povray.org Warp wrote:

>   The only concern I have about it is that it uses the "trick" to
>   calculate 
> the normal of the spline with the Spline(T+Epsilon)-Spline(T-Epsilon)
> formula. What I'm not sure about is the value for 'Epsilon'.

Does it matter that much? While building my macro's I settled with half 
the spline resolution as I didn't see any difference for smaller values.

Ingo

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