The Rebuild button for CV surfaces opens this dialog. It lets you specify how to rebuild the surface. Rebuilding the surface can change its appearance.
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Modify panel > Select a NURBS object. > Modifier stack display > Surface sub-object level > Select an independent CV surface sub-object. > CV Surface rollout > Rebuild button
Interface
- Tolerance Rebuilds the surface according to accuracy. The lower the Tolerance value, the more accurate the rebuild. Increasing Tolerance enables the surface to be rebuilt using fewer CVs.
- Number (The default.) Lets you alter the number of CVs in the surface. Number In U specifies the number in the U dimension, and Number In V specifies the number in the V dimension. These values default to the numbers that already exist in the surface.
- Preview
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When on (the default), your changes are previewed in viewports.