Returns a Boolean value indicating whether surface mesh is closed (true) or not.
set oObject = Application.ActiveProject.ActiveScene.Root.AddGeometry("Sphere","NurbsSurface")
set oNurbsSurfaceMesh = oObject.ActivePrimitive.Geometry
set oUKnots = oNurbsSurfaceMesh.Surfaces(0).Knots(siUDirection)
if oUKnots.Closed then
logmessage "NurbsSurface is closed in U"
end if
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