Wasn't it Kirk Andrews who wrote:

>It seems like someone had developed a macro that would produce a mesh from an
>isosurface.  Is that still available?  Could someone direct me there?

The original webpage of Kevin Loney's Approximation Macro seems to no 
longer exist, but there's a copy of his macro, and the version modified 
by Jaap Frank, in the download file in my isosurface tutorial.

http://www.econym.demon.co.uk/isotut/approx.htm

Be warned: In the vast majority of cases, the total time required to 
parse and render the approximation is greater than the time taken to 
render a real isosurface.

-- 
Mike Williams
Gentleman of Leisure

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