>>> If you're on to something then some working
>>> example code will go *far* further than just a text description.
>>
>> Totally agree, I am working on it.
>
> And here it is:

A good start!

How would you go about doing the union (or difference) of two rounded 
cubes? I tried to modify the code to do this but couldn't get it to 
work. If that works nicely then I think you're on to something...

BTW you could always use a macro for each element, that depending on 
some global switch, either used the standard POV non-rounded primitive 
(for speed of setting up the scene) or the isosurface variant (for final 
render).

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