A sample from the current work, which is a megapov macro to make tyres
(1st pic) with isosurfaces given the shape of the "sculptures" (en ?) as
a png bitmap (2nd pic).

Now I have a problem. The lateral parts of the tyres are made with
lathes, and I would like to connect them smoothly to the deepest part of
my isosurface, which is a 4th degree profile. I know the tangent to my
profile, and need to keep the same on the lathe. So my question is: what
is the slope of a cubic_spline lathe profile at one of its control
points?

TIA.
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