Simon Adameit wrote:
> 
> The color of the surface is made up from different components like 
> diffuse, ambient, specular, ... which all give you a color for this 
> point on the surface. The final color is somehow a combination of them. 
> For example you could substract the specular component from the diffuse. 
> This is something I often did using layered textures and negative colors.
> I dont know if this could be efficiently implemented or if it even would 
> be practical..

I don't think anything but additive combination of finish components 
would be of practical use  (note subtracting is already possible using 
negative values).

Christoph

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