<p dir="ltr">That's due to the Russian roulette that will randomly kill rays after they reach the minimum value, I believe.</p>
<div class="gmail_quote">On Nov 6, 2014 4:13 PM, "Daniel Salazar - <a href="http://patazstudio.com">patazstudio.com</a>" <<a href="mailto:zanqdo@gmail.com">zanqdo@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I've also found strange how you can make cycles calculate 200 bounces<br>
with not much apparent slowdown, wonder why..<br>
Daniel Salazar<br>
<a href="http://patazstudio.com" target="_blank">patazstudio.com</a><br>
<br>
<br>
On Thu, Nov 6, 2014 at 2:42 PM, David Fenner <<a href="mailto:d4vidfenner@gmail.com">d4vidfenner@gmail.com</a>> wrote:<br>
> Hi Thomas, thanks for the reply. I'll try to find time todar or tomorrow at<br>
> most to do a more clear test, with pics and blend file. I'm pretty sure I<br>
> tested it with 1 min bounce all the time though, but I'll run them again and<br>
> upload in a more organized way.<br>
><br>
> Thanks again,<br>
> David.<br>
><br>
> 2014-11-06 17:37 GMT-03:00 E. David Ferriman <<a href="mailto:dferriman@gmail.com">dferriman@gmail.com</a>>:<br>
><br>
>> Awesome! Thanks!<br>
>><br>
>> On 11/6/2014 3:33 PM, Thomas Dinges wrote:<br>
>><br>
>> Hi David,<br>
>> that is weird, I cannot think of a reason for this at the moment.<br>
>><br>
>> The way the feature works, is that it checks if the Light Max Bounce<br>
>> setting is greater than the current bounce, if that's the case it skips<br>
>> evaluating the lamp.<br>
>> Did you use the Pathtrace or Branched Pathtrace integrator? Also what were<br>
>> your global min bounces? If they differed from the global max bounces, it<br>
>> might be worth to check again with these 2 values being the same.<br>
>><br>
>> Thomas<br>
>><br>
>> Am 06.11.2014 um 14:00 schrieb David Fenner:<br>
>><br>
>> Hi Thomas, thanks for the commit yesterday, to control bounces per light,<br>
>> very nice!!<br>
>><br>
>> Been doing some tests here, and I ran into a very strange scenario:<br>
>><br>
>> When I have 3 or more max diffuse bounces in global render settings,<br>
>> reducing per lamp bounces have little to no impact in render times, even if<br>
>> set to 0 bounces. However, when I have only 2 max diffuse bounces in render<br>
>> settings, lowering per lamp bounces have a very big impact on render times,<br>
>> reducing them almost as much as if I lowered global diffuse bounces on the<br>
>> same quantity. It's like there was some sort of threshold at 2 global<br>
>> bounces. For example:<br>
>><br>
>> (on a simple diff scene with one lamp)<br>
>><br>
>><br>
>> Global Max Diff Bounces = 0<br>
>> Lamp bounces = 0<br>
>> Render Time: 4.7 sec<br>
>><br>
>><br>
>> Global Max Diff Bounces = 3<br>
>> Lamp bounces = 1024<br>
>> Render Time: 10 sec<br>
>><br>
>><br>
>> Global Max Diff Bounces = 3<br>
>> Lamp bounces = 0<br>
>> Render Time: 9.7 sec (almost the same as before)<br>
>><br>
>><br>
>> Global Max Diff Bounces = 2<br>
>> Lamp bounces = 2<br>
>> Render Time: 8.5 sec (lower rendertime thanks to one less bounce)<br>
>><br>
>><br>
>> Global Max Diff Bounces = 2<br>
>> Lamp bounces = 0<br>
>> Render Time: 4.9 sec (before it didn't even care, yet for 2 bounces<br>
>> and below its almost as there where no global bounces)<br>
>><br>
>><br>
>> It's great, with 2 global diff bounces and below the gains of lowering per<br>
>> lamp bounces are almost as big as if lowering global diffuse bounces, so<br>
>> having only a few lights with GI can increase your rendertimes amazingly,<br>
>> however, with 3 global diff bounces and over there is strangely almost no<br>
>> gain, even when all lamps have 0 bounces.<br>
>><br>
>><br>
>><br>
>><br>
>><br>
>><br>
>><br>
>><br>
>> _______________________________________________<br>
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>><br>
>><br>
>><br>
>><br>
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>><br>
>><br>
>> --<br>
>> E. David Ferriman<br>
>> Web Designer<br>
>> dferriman,com<br>
>> <a href="mailto:dferriman@gmail.com">dferriman@gmail.com</a> | <a href="tel:%28614%29%20260-7238" value="+16142607238">(614) 260-7238</a><br>
>><br>
>><br>
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><br>
><br>
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</blockquote></div>