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Edit Make Periodic 
The MakePeriodic command removes kinks from a curve or surface.
Periodic curve 
A periodic curve is a smooth closed curve. Periodic curves stay smooth when you edit them. 
Periodic Surface 
Periodic surfaces are closed surfaces (such as a cylindrical surface) that can be deformed without developing kinks. Periodic surfaces are automatically created when the input curves are periodic. 
Commandline option  

Smooth 
Controls kink removal. The Smooth option is only available when objects have not been selected. YesSmooths any kinks in the curve and moves control points to make a smooth curve. NoControl point locations are not changed or changed minimally (only one point may move) and only the knot vector is altered. 
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The MakeNonPeriodic command inserts a kink at the start/end of a curve or surface.
Non‑periodic curve 
A nonperiodic curve is a closed curve with a kink at the start/end of the curve. Deforming nonperiodic curves near the start of the curve may result in kinks. 
Non‑periodic surface 
A nonperiodic surface is a closed surface with a kink at the start/end of the surface. Deforming nonperiodic surfaces near the start of the surface may result in kinks. Nonperiodic surfaces are automatically created when the input curves are nonperiodic. Nonperiodic surfaces and curves deform with sharp corners at kinks. 
Rhinoceros 6 © 20102020 Robert McNeel & Associates. 13Oct2020