[Bf-cycles] Cycles CPU speedup: Perlin noise

Thomas Dinges blender at dingto.org
Fri Dec 27 20:58:44 CET 2013

Hi everyone,
today Svyatoslav Lockal send us a great patch which improves Perlin 
Noise calculation for Cycles CPU rendering, it's in master now.

Some tests with the BMW scene resulted in a 12-15% render speedup.

But I was curious to see how this behaves in a more production like 
environment, so I checked a file from the Open Movie Caminandes.
The scene I used was 11a_comp.blend (New Hope scene) from Caminandes on 
an Ivy Bridge Quad Core (3.4 GHZ) on Linux.
I rendered frame 500, with 1280x720 resolution, otherwise it's unmodified.


Before: 01:06:22h
New: 53:13min

That is a speedup of about 20% (19.76%), which is a lot. I checked the 
node setups and the artists used the Noise Texture almost everywhere. :D

Just wanted to share this, enjoy!

Best regards,

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