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:
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![catenoid.jpg](/povray.binaries.images/attachment/%3C3bb44b41%241%40news.povray.org%3E/catenoid.jpg?preview=1)
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