> Depending on what you mean by "scale", you might want to do something
> like this to cause the radius to vary linearly as z changes

Well, I was thinking of a permanent scale, like a cylinder and not like
a cone, as you showed me...

> #declare  F = function {
>   x*cos((z+2*clock)*2*pi)*(z-A)/B + x*x +
>   y*sin((z+2*clock)*2*pi)*(z-A)/B + y*y
> }

I think I get it, though I would have to test it to be sure...  I wish I
had time to spend again on this project...  Maybe this weekend!

> [I've also changed the syntax from being MegaPov specific to something
> that will also work in POVRay, so that I could test it].

Yes, thanks, I didn't know about it, but I'll use it from now on... (Do
you know of other MegaPOV VS POV3.5 changes regarding isosurfaces?)

> If you just want to scale the while thing, then you'll find the "scale"
> keyword useful. It still works with isosurfaces.

No, no... I'd prefer to keep it in math and less povray code.

Thanks a lot Mike,
  Simon

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