In the Modeling menu set, select
Surfaces > Reverse Direction > 
to open these options. These settings determine what happens when you select
.
- Surface Direction
-
Select U to reverse the CVs along the U parametric direction. U is the default surface direction.
Select V to reverse the CVs along the V parametric direction.
Select Swap to exchange U and V parameterization. Selecting an item a second time using the same direction restores the original CV sequence. Reversing the sequence of CVs for a surface reverses the surface normals.
Select Both to reverse the CVs and normals along both U and V parametric directions.
- Keep Original
-
Turn Keep Original on to keep the original curves after reversing the surface.