@Grassblade

Thank you very much, I think this is the best way for me:
> if you want smooth surfaces that follow the data with
> some error (smoothing out the data), you can use isosurfaces: pick a
> function shape you fancy, impose boundary conditions if you want to use
> splines, find out the parameters in a regression package (Excel can do it
> too, although it isn't recommended) and render.
(..it would be nice to see a code sample.. :) )

@Christoph Hormann

thank you so much for these very useful liks..

Alberto.

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