Elias Pschernig wrote:
> 
> This is maybe a very simple question for some, but I had no luck finding
> the answer with google, so I try it here: If I have a function of 2
> variables, what is the 'normal vector' for a given point (x, y)?
> 

I'm not really sure what you mean, the gradient vector is simply the
vector of the partial derivatives.  It's identical to the normal of the
isosurface at this point.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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