Wasn't it SharkD who wrote:
>I know there is a tool to create meshes from parametric functions and thereby
>speeding up rendering, but is there also one to create meshes from the implicit
>functions used in isosurfaces?

There is one, but it's usually a lot slower than using actual 
isosurfaces, so it's much less useful.

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

The code for all the images, including both versions of the macro, is in 
the ZIP file at the bottom of the page.

-- 
Mike Williams
Gentleman of Leisure

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