Comments (1)
The constants are from the paper An Anisotropic Phong Light Reflection Model
by Ashikhmin and Shirley. It's quite an outdated model by today's standards and it's also the same model that is used to implement the FresnelBlend
BSDF in PBRT-v3.
Related PBRT-v3 link: https://www.pbr-book.org/3ed-2018/Reflection_Models/Fresnel_Incidence_Effects
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