Btw, it would be perfectly possible to create a POV-Ray macro which takes
a 2-dimensional array of 3D points (ie. basically a grid of points) and
which would then generate a smooth surface which goes through all these
points, by creating a bicubic patch for each group of four adjacent points
in the grid. The tangential control points can be easily calculated in such
a way that the resulting group of bicubic patches form a smooth surface
which goes through all the given points.

  I actually once started writing such a macro, but I never finished it.

-- 
                                                          - Warp

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