Make a curve or surface open or closed
 
 
 
To... Do this

Join the ends of a curve together to make a periodic (closed) curve.

Select an open curve and choose Edit Curves > Open/Close Curves.

Make a periodic (closed) curve non-periodic.

Select the start CV (the CV that looks like a hollow box) and choose Edit Curves > Detach Curves.

Separate the ends of a periodic (closed) curve.

Select a closed curve and choose Edit Curves > Open/Close Curves. Maya opens the curve and reshapes it so its endpoints are separated.

Join edges of a surface to make a periodic (closed) surface.

Select an open surface and choose Edit NURBS > Open/Close Surfaces > .

Click U, V, or Both to choose which edges to join.

Move the seam of a closed (periodic) curve.

Select an curve point on the curve and choose Edit Curves > Move Seam. The seam will move to the edit point nearest your selected point.

Move the seam of a closed (periodic) surface.

Select an isoparm on the surface and choose Edit NURBS > Move Seam. The seam will move to the patch isoparm nearest your selected isoparm.

Change the direction in which a surface is periodic.

Select the surface and choose Edit NURBS > Open/Close Surfaces > .

Click U, V, or Both to choose which edges are periodic.

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