> > Did i get something wrong?
>
> Yes, you did: Diffuse surfaces are, by default, not computed by shooting
> hundreds or thousands of secondary rays around the scene, but by
> shooting rays towards the light sources only in order to determine
> shadowing. (A reflective surface just takes a single secondary ray, but
> that one will typically hit a diffuse surface, so the diffuse stuff is
> virtually always there.)
>
> If you use radiosity, then for diffuse surfaces POV-Ray does indeed
> shoot hundreds or thousands of secondary rays around the scene, but only
> for some samples on the surface, which are then weighted and averaged
> for any points in between.
>
> (And yes, radiosity is still slower than reflections indeed.)

Very good answer, now i got it! Thank you, both of you.

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