Replying to myself.
I bet youre talking about a line perpendicular to the surface normal and +y.
Am I right?

"Shay" <shi### [at] houstonrrcom> wrote in message
news:3c5d900d$1@news.povray.org...
>
> "Kari Kivisalo" <ray### [at] engineercom> wrote in message
> news:3C5D5450.CFC594A6@engineer.com...
> >
> >with trace found the direction of the contour line at
> > that point.
>
> Excuse my ignorance, but what is a contour line on a height-field? Are you
> referring to the normal at that point, or some other characteristic with
> which I am unaware?
>
>  -Shay
>
>

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