[Bf-cycles] max bounces

[David Fenner]

Hi Thomas, thanks for the reply. I'll try to find time todar or tomorrow at
most to do a more clear test, with pics and blend file. I'm pretty sure I
tested it with 1 min bounce all the time though, but I'll run them again
and upload in a more organized way.

Thanks again,
David.

2014-11-06 17:37 GMT-03:00 E. David Ferriman <dferriman at gmail.com>:

>  Awesome! Thanks!
>
> On 11/6/2014 3:33 PM, Thomas Dinges wrote:
>
> Hi David,
> that is weird, I cannot think of a reason for this at the moment.
>
> The way the feature works, is that it checks if the Light Max Bounce
> setting is greater than the current bounce, if that's the case it skips
> evaluating the lamp.
> Did you use the Pathtrace or Branched Pathtrace integrator? Also what were
> your global min bounces? If they differed from the global max bounces, it
> might be worth to check again with these 2 values being the same.
>
> Thomas
>
> Am 06.11.2014 um 14:00 schrieb David Fenner:
>
> Hi Thomas, thanks for the commit yesterday, to control bounces per light,
> very nice!!
>
>  Been doing some tests here, and I ran into a very strange scenario:
>
>  When I have 3 or more max diffuse bounces in global render settings,
> reducing per lamp bounces have little to no impact in render times, even if
> set to 0 bounces. However, when I have only 2 max diffuse bounces in render
> settings, lowering per lamp bounces have a very big impact on render times,
> reducing them almost as much as if I lowered global diffuse bounces on the
> same quantity. It's like there was some sort of threshold at 2 global
> bounces. For example:
>
>  (on a simple diff scene with one lamp)
>
>
>  Global Max Diff Bounces = 0
> Lamp bounces                 = 0
> Render Time: 4.7 sec
>
>
>  Global Max Diff Bounces = 3
> Lamp bounces                 = 1024
> Render Time: 10 sec
>
>
>  Global Max Diff Bounces = 3
> Lamp bounces                 = 0
> Render Time: 9.7 sec   (almost the same as before)
>
>
>  Global Max Diff Bounces = 2
> Lamp bounces                 = 2
> Render Time: 8.5 sec      (lower rendertime thanks to one less bounce)
>
>
>  Global Max Diff Bounces = 2
> Lamp bounces                 = 0
> Render Time: 4.9 sec       (before it didn't even care, yet for 2 bounces
> and below its almost as there where no global bounces)
>
>
>  It's great, with 2 global diff bounces and below the gains of lowering
> per lamp bounces are almost as big as if lowering global diffuse bounces,
> so having only a few lights with GI can increase your rendertimes
> amazingly, however,  with 3 global diff bounces and over there is strangely
> almost no gain, even when all lamps have 0 bounces.
>
>
>
>
>
>
>
>
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> --
> E. David Ferriman
> Web Designer
> dferriman,comdferriman at gmail.com | (614) 260-7238
>
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