I was just thinking that an isosurface should be able to be made so that it
draws a line between two points. y and z change as a function of x until it
meets the <x,y,z> you want. Then times 0.001 or what ever to make the line
thin.

    I'll test it later, another animation is running right now.

"Steve Martin" <sma### [at] usitnet> wrote in message
news:38CE4234.64C7617A@usit.net...
> Mike Weber wrote:
>
> > > I wondered if there is an easy way to make threedimensional curves
using a
> > > mathematical function, ideally precisely between two points . How
could
> > this
> > > be done in POV-ray?
>
> > But it you want a line between two points - it will only be straight
one...
>
> <pedantic mode on>
>
> Actually, a Bezier curve is between two points (its end points). It does
> of course depend on two other points that influence the shape of the
> curve, but these points are not *on* the curve; the end-points are the
> only points you specify that actually lie *on* the curve.
>
> <pedantic mode off>
>
> I believe you probably are interested in a field of math referred to as
> "cubic polynomials".

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