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An Anisotropic Phong BRDF Model
Michael Ashikhmin, Peter S. Shirley
In Journal of Graphics Tools, 5(2), 2000.

Abstract: We present a BRDF model that combines several advantages of the various empirical models currently in use. In particular, it has intuitive parameters, is anisotropic, conserves energy, is reciprocal, has an appropriate non-Lambertian diffuse term, and is well-suited for use in Monte Carlo renderers.

BibTeX format:

@article{Ashikhmin:2000:AAP,
  author = {Michael Ashikhmin and Peter S. Shirley},
  title = {An Anisotropic Phong BRDF Model},
  journal = {Journal of Graphics Tools},
  volume = {5},
  number = {2},
  pages = {25--32},
  year = {2000},
}

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