e2cef1c713
This moves the pre-computation offline and store the pre-computed table in the binary. The pre-computed tables are quite small and are not a concern with respect to binary size increase. This rewrites the precomputation to use manually fitted approximations for both burley and random walk. The approximations fix a discrepancy between cycles and EEVEE SSS translucency look. The absolute maximum error is below 2%. I believe better results could be achieved with automatic fitting tools. Note that Cycles Burley translucency profile has some issues as it does not give a smooth profile. The profile is biased near the end of the lower radii. For this reason, the fit was done on a white diffuse with (1,1,1) radii which does not exhibit this artifact. Note that while this adds the profile for random walk, it isn't currently used because the profile type is not yet passed down the deferred path. The fitting data can be found attached to this PR. Pull Request: https://projects.blender.org/blender/blender/pulls/112512
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