>I wonder how the ideal diffuse (Lambertian) surfaces are defined in
>POVRAY. The 'obvious' way seemed to be to define a finish
>with diffuse=1, but what about the brilliance parameter --
>does Lambertian model correspond to some particular value of brilliance?

Diffuse reflectance in POV-Ray depends on pigment and diffuse value. I
suggest to set diffuse=1 and set diffuse reflectances to color pigment.
Then it is easy to add reflection to surface reducing diffuse value using
same pigment. Lambertian model use default brilliance value.

Matti

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