[Bf-cycles] max bounces

[E. David Ferriman]

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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>
>
>
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-- 
E. David Ferriman
Web Designer
dferriman,com
dferriman at gmail.com | (614) 260-7238

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