Wasn't it TJ Giese who wrote:
>Mike Williams wrote:
>> My guess is that you'd be better off performing the interpolation
>> required to generate data for an evenly spaced grid in an external
>> program and outputting it as a df3 file. 
>
>Ah. Nice.  Based on your comment, I googled "df3" and have found
>some results that are very encouraging and I include links here
>so if anyone searches the news group for this topic, they will
>hopefully run across these as possibilities to consider.
>
>http://www.linuxjournal.com/article/7486
>
>Leigh Orf describes creating a df3 file, declaring it as a povray
>function, and then creating an isosurface object that acts on that
>declared function, i.e.,
>
>#declare DENSFUNC=function
>{ pattern {
>   density_file df3 "cloud.df3" interpolate 1
>} }
>isosurface {function { 0.1 - DENSFUNC(x,y,z) }
>
>
>http://news.povray.org/povray.binaries.utilities/thread/%3C41605076@news.povray.
>org%3E/
>
>Andrew Le Couteur Bisson describes are program he has written
>that transforms a df3 file to a mesh2 object.

Or my own
http://www.econym.demon.co.uk/isotut/patterns.htm#density

-- 
Mike Williams
Gentleman of Leisure

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