Interpolation vectors are ok, Bezier splines are ok, loops are ok, grid macro
was rewritten from scratch, uv vectors fixed so it tiles perfectly.

Here's a plain torus given just a wee bit of noise to undulate the surface.
uv-mapped, especially for Alain.  ;)

Torus radii are 4 and 10, and I needed to re-render the grid at 2000x2000 to get
an acceptable look without too much "stretching" which was painful to look at.

With twice the noise and a good texture, it makes a pretty great looking donut.
I need to find a good tilable cake donut texture to UV-map this with.  :)

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