Is there a way to set the domain of uv surface?

It create points outside the surafce when I use Surface.PointAtParameter(Picture1). But what I really want is create point in side the surface. How can I make it?(Picture2)


Avoid creating surfaces by Patch, instead build using using cross sections and guide curves

pointAtParameterDomain.dyn (17.9 KB)

Thanks a lot.

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