#1 Bicubic Spline Functions

[Anonymous]

A very useful and quite rare feature would be the ability to fit a bicubic spline function z=f(x,y) that interpolates given z values at regular grid points (x_i,y_k).

This type of interpolation is not applicable to "scattered" input data. This type of interpolation is further (unlike e.g. NURBS) restricted to functions, i.e. can't fit parametric surfaces.