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Thomas Dinges cd72396797 Cycles: Optimization for black world backgrounds
* If a Background node is set to a black color or zero strength,
it now gets removed from the shader graph.

* In case the graph is empty (no background node), the kernel will skip
evaluating it and save some rendertime. This can help quite a bit in scenes,
where the majority of the image consists of a black background.

Example: http://www.pasteall.org/pic/show.php?id=82650
In this case the render is ~16% faster.

Differential Revision: https://developer.blender.org/D972
2015-01-21 20:16:18 +01:00
2013-12-24 22:57:27 +06:00
2014-08-08 06:00:49 +10:00
2010-10-13 14:44:22 +00:00
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