> You might check out my knotsplines macro, where I describe how to get a
> spline from the povray-exported bicubic patch done by KnotPlot.


In fact, I took a look at your macro before starting my image. It looks 
really powerfull. But I decided to go this time with a non-mathematical 
way of doing the thing: I just saw a relatively simple way (although a 
bit tedious) to get what I wanted with Wings, the only guide being the eye.

Thibaut

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