ruy wrote:
> I did this spiral using a blob and the macro that converts HSV to RGB.
> 
> My problem is that I can't get rid of the artifacts caused by the blob (and,
> believe me, I've tried it a hundred different ways). The only possibility would
> be to double or triple the amount of control cylinders, which will make this
> already very slow image to be impossible to render.
> 
> I post it here so I can ask a question in General: is it possible to transform
> this spiral into a parametric isosurface? If so, how can I get to the formula?

It would probably be easier to generate a mesh, specifically, one that 
sweeps the tall thin rectangular cross-section around the spiral path.

Regards,
John

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