Q: How do you make a catenoid?

A: Pull its tail.

I can't remember where I heard that one, probably somewhere on the net.  I
agree with you on isosurfaces, they're fantastic!

    ~Kevin Wampler~

Duncan Adamson wrote:

> OK, I am sold on iso-surfaces.  A long time project of mine has been to
> create a catenoid (minimal surface object created by rotating a catenary
> (shape a hanging rope makes)).
>
> Functions are fantastic.  Here it is:
>
>  [Image]

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