Returns a KnotCollection for the specified U-direction.
set oObject = ActiveSceneRoot.AddGeometry("Sphere","NurbsSurface")
set oNurbsSurfaceMesh = oObject.ActivePrimitive.Geometry
set oNurbsSurface = oNurbsSurfaceMesh.Surfaces(0)
set oUKnots = oNurbsSurface.UKnots
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