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Nurbs Cylinder

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I''m trying to create a cylinder constructed of 4 Nurbs patches. The patches are formed using 16 control points: Row1: (-5, 0, 5), (5, 0, 5), (5, 0, -5), (-5, 0, -5) Row2: (-5, 5, 5), (5, 5, 5), (5, 5, -5), (-5, 5, -5) Row3: (-5, 10, 5), (5, 10, 5), (5, 10, -5), (-5, 10, -5) Row4: (-5, 15, 5), (5, 15, 5), (5, 15, -5), (-5, 15, -5) In Building each Patch I''ve managed to generate a curved surface that I hoped would make up each side of the cylinder (4 Patches), however when putting them together I get a crossed epsilon shape - I''m sure it''s creating a bezier patch, where I need a B-Spline or Nurb patch. I''m pretty sure it comes down to the knot vectors - which I''m not overly familiar with, does anybody know what knot vectors to use, how many know vectors, etc, etc?

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