Cheers. I may have come across a hurdle or two. I'm going to quote someone from
an email - I'm sure they won't mind:

> The problem is there's no way to incorporate while loops and local
> variables into POV-Ray's isosurface functions. Basically, there are
> functions and there are macros in POV-Ray. Macros can incorporate
> while loops and local variables, but functions cannot. But,
> isosurfaces can only be created using functions.

Is this planned for a future version of POVray?

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