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Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
Applied to newly added files in 2.8
We generate a 3D lut to precompute the btdf intensity. I decided to use a 64*64*16 (N dot V, ior, roughness) because the btdf varies less with roughness than with IOR. We also remap the ior to better use the space in the LUT.
