NURBS curves can be modified by parameters and constraints, if you constrain the curves interpolation points.
Using parameters in NURBS curves
Selecting a method of constraint
Definition of a distance to the center of coordinates. The distance is defined as a parameter. In following steps, the parametric distance is defined for multiple interpolation points.
The cam before change of the shape – value of parameters was not changed yet
Changing distances of points from the center – the parameters are modified
The cam after parametric change of the shape
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