Modify panel > Select NURBS object. > Stack display > Curve sub-object level > Select an independent CV curve sub-object.
> CV Curve rollout > Reparam. button
Modify panel > Select NURBS object. > Stack display > Curve sub-object level > Select an independent CV surface sub-object.
> CV Surface rollout > Reparam. button
Tip: It is a good idea to reparameterize after you have added CVs to a curve or surface by refining or inserting.
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.
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—When on, the curve is automatically reparameterized as you edit it, using the currently active method of reparameterization. When off, no reparameterization happens unless you use this dialog. Default=off.
Preview—If on (the default), displays the effects of reparameterizing in viewports.