Wasn't it mephuser who wrote:
>Is it possible to convert the Code for the Predefined Shapes into Isosurface
>Code?
>
>Any external programs that can do this?
>
>How do I write Isosurface Code for all the Predefined Shapes such as Torus,
>Sphere, Cube, Rounded cube, cylinder and etc?

There's no general solution. For some shapes there are builtin
functions, like f_sphere(), f_torus(), f_rounded_box(). Some other
shapes have simple formulae, like

#declare Cube=functionfunction { max((y*y-1),(x*x-1),(z*z-1)) }

#declare Cylinder=function { y*y + z*z - R*R }

Prisms and lathes can be achieved with the technique described here:
<http://www.econym.demon.co.uk/isotut/splines.htm#bent>

Check also the alphabetical index of the Isosurface tutorial:
<http://www.econym.demon.co.uk/isotut/xref.htm>

For many shapes there's also the IsoCSG library.

Some shapes, like meshes, are virtually impossible.

-- 
Mike Williams
Gentleman of Leisure

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