in news:web.3ed4d89fa160507a738e706a0@news.povray.org LibraryMan wrote:

> I suppose I *am* being dense about what the -0.25 and 1.25 values
> have to do with control points of a cubic_spline; I mean, the 3-D
> vectors are already specified, and the spline type could be changed
> to sommething else and POVRay should know what to do in whichever
> case... 
> 

For a better understanding why more points are needed for a cubic spline 
read section "6.5.1.7  Lathe" of the documention.

Ingo

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