Thanks for your explanation Ron. I think I understand it.

However, I can't get it to work.

I tried to look at the code Chris Colefax posted in his reply. When I
changed the variable V2 to 2.0 the patches seemed to meet the criteria you
mentioned, if I understood them correctly.

(To see it more clearly comment out the reference sphere, toggle of the
patches, use location <3,0,-3> in the camera, and add "orthographic" in the
end of it)

But still the patches aren't joined completely smoothly.

How comes?

Rune
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