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author | Sergey Sharybin <sergey.vfx@gmail.com> | 2016-02-04 17:25:29 +0300 |
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committer | Sergey Sharybin <sergey.vfx@gmail.com> | 2016-02-04 17:29:58 +0300 |
commit | 3e7389eaf2d7ffbd180931c117776d3de2da5adb (patch) | |
tree | d63be65c92ad5b50e07f8e0425394d0add1aef62 /build_files | |
parent | f250aa9d86a35ae8bb6692a85ffe04610924fb08 (diff) |
Cycles: Speedup of Christensen-Burley SSS falloff function
The idea is simply to pre-compute fitting and parameterization
in the bssrdf_setup() function and re-use the values in both
sample() and eval().
The only trick is where to store the pre-calculated values and
the answer is inside of ShaderClosure->custom{1,2,3}. There's
no memory bump here because we now simply re-use padding fields
for the pre-calculated values. Similar trick we can do for other
BSDFs.
Seems to give nice speedup up to 7% here on my desktop with
Core i7 CPU, SSE4.1 kernel.
Diffstat (limited to 'build_files')
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