Parameterization

 
 
 

NURBS are parameterizable, which means that any point along a NURBS can be mathematically defined by one or more parameters.

Curves are defined by a single U parameter along their length; you can describe any point along a curve in terms of its U parameter.

Similarly, surfaces are defined by both U and V parameters; you can describe any point along a curve in terms of its (U, V) coordinates.

U and V are similar to latitude and longitude.

Depending on how a NURBS is parameterized, different values of U and V correspond to different points. You can reparameterize curves as described in Reparameterizing Curves , and surfaces as described in Reparameterizing Surfaces. Surfaces can have one parameterization type along U and a different one along V.

There are four parameterization methods available:

Normally, when you create a NURBS object, its parameterization is uniform. However, that may change and become non-uniform as you perform modeling operations on it.