[Bf-cycles] ray depth

[Gottfried Hofmann]

On 10/06/2014 03:23 AM, David Fenner wrote:
> As you can see, the real gain comes with deactivating the global bounce,
> even when there is only one light and one diffuse shader for all
> geometry. Deactivating the bounce in the light should be the same as
> deactivating it globally, since there is only one light. Maybe I'm doing
> something wrong here.... pics have shader tree.

It is not the same. Deactivating it globally will make light not bounce 
anymore after the first intersection.
Setting the bounces to 1 will allow one GI bounce. Only when that bounce 
hits the light, the BSDF will not be evaluated. So you get a small 
speedup (which you correctly measured), but there are still all the 
other rays that have bounced and make their way through the scene that 
won't reach the light at all, like all the bounces towards the background.

Cheers,
Gottfried

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Gottfried Hofmann
Blender Foundation Certified Trainer
www.BlenderDiplom.com