"david sharp" <dsh### [at] interportnet> wrote in message
news:3928afce@news.povray.org...
>
> David Fontaine <dav### [at] faricynet> wrote in message
> news:3928ADAE.15F2E71E@faricy.net...
> > #declare KuenSurface = parametric {
> >    function (2*sqrt(1+u^2)*cos(u-atan2(u,1))*sin(v))/(1+u^2*sin(v)^2),
> >             (2*sqrt(1+u^2)*sin(u-atan2(u,1))*sin(v))/(1+u^2*sin(v)^2),
> >             log(tan(.5*v))+(2*cos(v))/(1+u^2+sin(v)^2)
> >    <0,0>,<2*pi,pi>
> >    <-5,-5,-5>,<5,5,5>
> > }
> >
>
> In function{}'s it is  'ln' instead of 'log'

Isn't that to base e rather than base 10 though?

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