Hang a rope from two points <0,1,0> and <1,1,0>
The shape it makes is a caterary

Rotate this shape around the x axis to get a catenoid (formula radius =
(1/a)cosh(ax))

My catenoid has been rotated to stand on its end.

Duncan

"Is" <mee### [at] yahoocom> wrote in message news:3BB### [at] yahoocom...
> Your ropes hang that way?
>
>
> 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:
> >
> >
> >
> >
> >
> > catenoid.jpg
> >
> > Content-Type:
> >
> > image/jpeg
> > Content-Encoding:
> >
> > x-uuencode
> >
> >
>
>

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