See:

http://perso.wanadoo.fr/mops/atelier2.htm

You can get a translation from Google.

The MOPS is basically exactly what you are looking for.  It doesn't do the
'droop' at the top, but if you need you can fake that with an outside radius
wheel on the top return.

See my image in P.B.I if you want an example of what it can look like.  (my
take on a sphere and plain).

        == John ==

"Tom Melly" <pov### [at] tomandlucouk> wrote in message
news:415c1cb2$1@news.povray.org...
> "Le Forgeron" <jgr### [at] freelocalhost> wrote in message
> news:Xns957477BB0D7DDjgrimbertmeandmyself@203.29.75.35...
> >
>
> <snip>
>
> Uhh, thanks... actually, I'll settle for a track that vaguely follows the
> path around the wheels without going via Mars...
>
> > I made a track, but without catenary, for a 3 wheels system,
> > you can find it at irtc, 2000, july-october, sylvanus, robot.inc, at the
> > end.
>
> I'll take a look.
>
> > Not a lot of comment, and most variable name in french...
>
> French is fine - I'm a perl-programmer.
>
>

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