Wasn't it ehmdjii who wrote:
>im still having problems understanding isosurfaces.
>
>how would a function look like that creates a hole through a box?
>
>let me explain in 2D from top down:
>
>#########
>#########
>#########
>###   ###
>###   ###
>###   ###
>#########
>#########
>#########
>
>thanks!

In my isosurface tutorial you can find out how to make an isosurface box
here: http://www.econym.demon.co.uk/isotut/simple.htm#box

and how to create the intersection of two isosurfaces here:
http://www.econym.demon.co.uk/isotut/combine.htm#inters

But you want the difference, not the intersection, so you need to turn
the inner isosurface inside out:
http://www.econym.demon.co.uk/isotut/insideout.htm

-- 
Mike Williams
Gentleman of Leisure

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