Am 26.07.2014 14:19, schrieb And:

>> This can be fixed however -- and voila: It does provide for pretty neat
>> effects.
>
> I heard that there is an oren-nayar model. Is it something like that? If so, it
> is very good because difference of diffuse model can creat many variety of
> texture. The current pov-ray feature which can do this is not rich. Only
> normal{...} on a texture can work with radiosity.

No... not really. Oren-Nayar started with a physical model of how the 
observed effect might be explained, and then derived an exact 
mathematical formula from this model.

What I did was start with an existing mathematical formula (which 
presumably is just a more-or-less random tweak of the lambertian model), 
interpret it as a modulation of the light intensity based on the 
incoming light angle, and apply that very same modulation based on the 
outgoing light angle as well.

> Brilliance for radiosity is good.

That's why I put it in ;-)

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