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I know that something like the command spap2({knotsx,knotsy},[m m],{x,y},z) can fit a surface over a uniform grid of data, but what if x and y arent % nrbrevolve - Construct surface by revolving a profile. % nrbruled - Ruled surface between twp NURBS curves. % nrbcoons - Construct Coons bilinearly blended (). So I want a b-spline or a NURBS surface or curve to fit the 3D data. Given a set of six points a closed NURBS curve is used to approximately fit all the six data points. Run the file main.m and everything works fine. The matrix To interactively fit a surface, follow the steps in this simple example: Load some data at the MATLAB® command line. Open the Curve Fitter app. In the Curve NRBLOFT constructs a NURBS representation surface from an adjacent series of lines or NURBS curves. NRBLOFT requires the NURBS toolbox:For use with the NURBS toolbox, GNURBS allows the user to have an intuitive manipulation of a NURBS surface/curve via control points. example: