clipka wrote:

> The idea behind this is that it is no good to shoot e.g. approx. 4 
> prinary ray for each pixel (for AA), but 4x10 = 40 secondary rays for 
> first blurred reflection, 4x10x10 = 400 tertiary rays for second blurred 
> reflection, and maybe another 4x10x10x10 = 4000 shadow test rays for 
> area lights, when you could instead shoot e.g. 20 primary rays, 20x2 = 
> 40 secondary rays, 20x2x2 = 80 tertiary rays, and 20x2x2x2 = 160 shadow 
> test rays.

Pixar's docs indicate that shooting one reflected ray and/or one 
refracted ray for each intersection that has reflection and/or 
refraction in the shader, and one shadow ray for each intersection for 
each light source, is enough; anti-aliasing is accomplished by jittering 
the light sources and the reflected and refracted rays, and setting the 
overall anti-aliasing level high enough to reduce granularity to an 
acceptable level.

Regards,
John

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