<p dir="ltr">Well yes, it would be nice if Cycles could automatically detect when it can set global bounces to 0, but you're not gaining any new capabilities this way. I imagine that if you want no light bounces at all, then you would have probably just set global bounces to 0, rather than going through the trouble of changing all lamps, emissive surfaces, volumes, ambient occlusion, the world shader, and whatever else in the scene might be emitting light.</p>
<p dir="ltr">There are various optimizations possible here, but this specific case doesn't seem all that helpful for a production scene?</p>
<p dir="ltr">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">http://i.imgur.com/XFdhp9l.png</a><br>
> 128 bounces with Ray Depth trick, 5:11 - <a href="http://i.imgur.com/p8kL5ki.png">http://i.imgur.com/p8kL5ki.png</a><br>
> 0 bounces, 4:10 - <a href="http://i.imgur.com/xQdrSQD.png">http://i.imgur.com/xQdrSQD.png</a><br>
><br>
> Nodes used for one of the lamps: <a href="http://i.imgur.com/MBsi7hh.png">http://i.imgur.com/MBsi7hh.png</a> (also tried<br>
> <a href="http://i.imgur.com/htdCsxi.png">http://i.imgur.com/htdCsxi.png</a> - made no difference)<br>
> Blend file: <a href="http://pasteall.org/blend/31928">http://pasteall.org/blend/31928</a><br>
><br>
> Cheers,<br>
> Greg<br>
><br>
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</p>