>> How is it possible to do that?
> 
>> (I'm not denying that games do it - they obviously do - I'm curios as to 
>> how it's possible to do this given that the GPU only knows about 
>> polygons and texture mapping.)
> 
>   The GPU also knows about vertex normals and can interpolate them and
> calculate the lighting of the surface according to the normal. In a similar
> way as POV-Ray does.
> 
>   Nowadays you can even write a shader which calculates the lighting from
> the normal vector and positions of light sources in special ways, if you
> want.

I was more puzzled as to how you compute shadows.

-- 
http://blog.orphi.me.uk/
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