"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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