The Reparam. button for CV curves and surfaces displays this dialog. Reparameterizing a CV sub-object changes its parameter space to provide a better relation between control point locations and the shape of the sub-object.
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Modify panel > Select a NURBS object. > Modifier stack display > Curve sub-object level > Select an independent CV curve sub-object. > CV Curve rollout > Reparam. button
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Modify panel > Select a NURBS object. > Modifier stack display > Curve sub-object level > Select an independent CV surface sub-object. > CV Surface rollout > Reparam. button
Interface
Reparameterization group
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Chord Length Chooses the chord-length algorithm for reparameterization.
Chord-length reparameterization spaces knots (in parameter space) based on the square root of the length of each curve segment.
Chord-length reparameterization is usually the best choice.
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Uniform Spaces the knots uniformly.
A uniform knot vector has the advantage that the curve or surface changes only locally when you edit it. With chord-length parameterization, moving any CV can potentially change the entire sub-object.
- Maintain Parameterization
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When on, the curve is automatically reparameterized as you edit it, using the active method of reparameterization. When off, no reparameterization happens unless you use this dialog. Default=off.
- Preview
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If on (the default), displays the effects of reparameterizing in viewports.