A comparison of four brdf models.

Technical report PCG-04-02, Program of Computer Graphics, Cornell University, April 2004.

We compare four parametric reflectance models that are well-known in computer graphics: the Phong, Ward, Lafortune, and He-Torrance models. We compare the models with physical measurements on five representative sample surfaces. The surfaces span the domain of isotropic, homogeneous surfaces ranging from smooth to rough and including metal and dielectric surfaces. Since no one model was a clear winner in all cases, we draw conclusions about which of the models are best to represent various surfaces. We explain the differences in terms of the basic scattering phenomena involved.

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