Hi!
There is nurbs-curve with four control points.
For an example: (1,1.5,0.5),(0.5,0.5,1.2),(-0.8,-1,0.3),(-2,0.1,0.8)
It is necessary to create a tube along a curve, using two bicubic patches
Radius tube = R
The mathematics is necessary :) :) :)

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