caternary is of the form

y = (1/a)(cosh(a*x))
where a is a constant

note: this is equivalent to
y = (1/a)((e^(a*x) + e^(-a*x))/2)
where a is a constant
where e is the standard mathematical constant 2.817.....

Duncan

"Nekar Xenos" <j-p### [at] citywalkcoza> wrote in message
news:3bb481e2@news.povray.org...
>
> "Duncan Adamson" <dja### [at] docicacuk> wrote in message
> news:3bb4754e$1@news.povray.org...
> > 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))
>
> Is this the formula for a caterary or a catenoid? I'm looking for the
formula
> for a caterary.
>
> Regards,
>
> - Nekar
>
>
>

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