<div dir="ltr">Well that was the question, if it was possible to skip bounces of some lights even when other lights have GI. So it isn't possible? if for example a scene with 10 lights all with bounces renders in 5 minutes, and the same but globally no bounces renders in 2 minutes, then what you are saying is that it is inevitable that if only 1 of the 10 lights have bounces the scene will always render in the same 5 minutes if GI is used globally (Even when 9 of 10 lights don't bounce)?? That is the way it is now, I was hoping that even when GI is globally activated, as long as we started reducing bounces on the lights that don't need them render times would decrease.<div><br><div><div><br></div><div><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">2014-10-06 15:47 GMT-04:00 Brecht Van Lommel <span dir="ltr"><<a href="mailto:brechtvanlommel@pandora.be" target="_blank">brechtvanlommel@pandora.be</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I understand the use case, GI with some auxiliary lights that do not<br>
use GI. But the tests being done here are not representative of that,<br>
the main speedup you are seeing in that test is because you're<br>
skipping bounces that you can't skip if you need GI for other light<br>
sources.<br>
<div class="HOEnZb"><div class="h5"><br>
On Mon, Oct 6, 2014 at 8:50 PM, David Fenner <<a href="mailto:d4vidfenner@gmail.com">d4vidfenner@gmail.com</a>> wrote:<br>
> Hmm I don't understand what you mean brecht... I never said anything about<br>
> wanting no global bounces at all, in the first mail I explained that usually<br>
> some lights (like environment) need GI but many auxiliary lights used to<br>
> "paint" polygons don't. For example, think of a scene that has 2 lights with<br>
> GI, and 8 lights (rims, face aux, eye aux, some torch, whatever) don't need<br>
> GI, and in fact GI works worse visually. In this scene there would be no<br>
> gain at all by making these 8 lights not bounce, but since they don't<br>
> bounce, can't these rays not be calculated to make it faster?<br>
><br>
> Please check first mail, the idea is to make it easier to make some lights<br>
> not bounce for artistic control and that this also helps to optimize speed,<br>
> since they don't bounce... I don't even know if its possible, but I do<br>
> believe that a scene with 8 lights bouncing should render slower than one<br>
> with 1 light bouncing (of 8), or this is not possible with pathtracers??<br>
><br>
><br>
> 2014-10-06 13:49 GMT-04:00 Brecht Van Lommel <<a href="mailto:brechtvanlommel@pandora.be">brechtvanlommel@pandora.be</a>>:<br>
><br>
>> Well yes, it would be nice if Cycles could automatically detect when it<br>
>> can set global bounces to 0, but you're not gaining any new capabilities<br>
>> this way. I imagine that if you want no light bounces at all, then you would<br>
>> have probably just set global bounces to 0, rather than going through the<br>
>> trouble of changing all lamps, emissive surfaces, volumes, ambient<br>
>> occlusion, the world shader, and whatever else in the scene might be<br>
>> emitting light.<br>
>><br>
>> There are various optimizations possible here, but this specific case<br>
>> doesn't seem all that helpful for a production scene?<br>
>><br>
>> On Mon, Oct 6, 2014 at 1:52 PM, Greg Zaal <<a href="mailto:gregzzmail@gmail.com">gregzzmail@gmail.com</a>> wrote:<br>
>> > Done some tests too and David is right.<br>
>> ><br>
>> > 128 bounces, 5:14 - <a href="http://i.imgur.com/XFdhp9l.png" target="_blank">http://i.imgur.com/XFdhp9l.png</a><br>
>> > 128 bounces with Ray Depth trick, 5:11 - <a href="http://i.imgur.com/p8kL5ki.png" target="_blank">http://i.imgur.com/p8kL5ki.png</a><br>
>> > 0 bounces, 4:10 - <a href="http://i.imgur.com/xQdrSQD.png" target="_blank">http://i.imgur.com/xQdrSQD.png</a><br>
>> ><br>
>> > Nodes used for one of the lamps: <a href="http://i.imgur.com/MBsi7hh.png" target="_blank">http://i.imgur.com/MBsi7hh.png</a> (also<br>
>> > tried<br>
>> > <a href="http://i.imgur.com/htdCsxi.png" target="_blank">http://i.imgur.com/htdCsxi.png</a> - made no difference)<br>
>> > Blend file: <a href="http://pasteall.org/blend/31928" target="_blank">http://pasteall.org/blend/31928</a><br>
>> ><br>
>> > Cheers,<br>
>> > Greg<br>
>> ><br>
>> > _______________________________________________<br>
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>> ><br>
>><br>
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