OpenGL lighting fixes

[Kai Habel]

Michael Goffioul schrieb:
> ...
>
>   
>> 2.) The surface normals should be calculated when facelighting is set to
>> 'flat' too.
>>     
>
> That's not my understanding of Matlab documentation. When facelighting
> is flat, the ligthening should be uniform across the each quad and equal
> to the lightening of the first vertex. That's why I don't update the normal on
> the usbsequent vertices.
>
>   
> ...

Thanks,
for the reply and brief explanation. I did some tests myself, and can
confirm the behavior you have described above. So, I have reworked the
patch that only the calculation of diffuse reflection and surface
normals is modified.

Kai
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