Edit NURBS > Untrim Surfaces

Undoes the last trim or all trims to a surface.

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Edit NURBS > Untrim Surfaces >

Keep Original: If you set Keep Original to On, the untrimmed surface is created and the original trimmed surface is retained. If you select Off, the untrimmed surface replaces the trimmed surface.
Untrim: Select All to remove all trimming information from the surface. All curves-on-surface are also displayed again. All is the default.

Select Last to cancel the last trim operation. For example, if a surface had been trimmed three times, this option shows the result as if it had only been trimmed the first two times.