Thinking about it, it might be a bit more complicated. If you have sharp bends
in the spline, you could get more than two results.

- Nekar

"Nekar Xenos" <j-p### [at] citywalkcoza> wrote in message
news:3bcd3b14@news.povray.org...
> I guess you'd need to know what the mathematical formula is for the spline. If
> you have that you can test for an intersection with a sphere having a diameter
> the same as the distance you want. Start with the sphere centre at the one end
> of the spline and then move the centre to the result you get each time. You'll
> should get 2 values each time, so you'll have to check which is the correct
one.
> One of the two values should be the same as the one before the previous one.
>
> I hope this is understandable. Unfortunately I don't know the mathematical
> formula for a spline. It's probably in the docs...
>
> - Nekar
>
> "Gail Shaw" <gsh### [at] monotixcoza> wrote in message
> news:3bcd3670@news.povray.org...
> > I'm trying to write a macro to create a chain that follows a spline and I've
> > run
> > into a problem. As far as I can tell there is no way to get the value of a
> > spline
> > at equal distances along it.
> >
> > Does anyone know of a way to place objects at equal distances along
> > a spline, short of trial and error?
> >
> > Gail
> > --
> > *************************************************************************
> > * gsh### [at] monotixcoza                *   Step into the abyss,           *
> > * http://www.rucus.ru.ac.za/~gail/   *   and let go.          Babylon 5 *
> > *************************************************************************
> > * Just think of me as the storm before the calm     Magic: The Gathering*
> > *************************************************************************
> >
> >
>
>
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