I think I'll just rotate along the direction of motion to get an "average"
fit.  May not work really close up on really rought terrain, but at least
it'll make some accomodation for roughness.

"Alf Peake" <alf### [at] peake42freeservecouk> wrote in message
news:3d91d10d@news.povray.org...
> My maths isn't up to answering your question, but I was wondering how
> you would deal with the track sections that may be twisted, that is,
> the ties do not remain horizontal. I guess you could allow the wheel's
> suspension to solve that one. You would only need to consider the
> center line, parallel to the track, of the box base then?
>
> Alf
>
>
>

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