polysurf

Generates a surface based on bilinear interpolation between 4 connected 3-D point sets

Bilinear interpolation of four connected polylines
Performs a bilinear interpolation between four connected 3-D parametric functions in the XYZ-space. The parametric functions are first discretized into polylines (piecewise linear functions) and then interpolated using the Coon's bilinear interpolation method which is implemented for polyline objects. This implementation allows each boundary function to have an arbitrary number of sampling points. The bilinear interpolation method itself allows quite advanced surfaces to be generated from arbitrary 3-dimensional analytical parametric functions and point sequences.