Previous Work

Cook and Torrance BRDF Model (1981)

• Bidirectional Reflectance Distribution Function: "the ratio of the reflected intensity in a given direction to the incident energy from another direction (within a small solid angle)."
• Ambient, diffuse, and specular reflectances depend on wavelength
• Reflectances are determined experimentally
• Color shifts occur for a specular component at grazing angles

Bahar and Chakrabarti Reflectance Model (1987)

• Reflection model for metallic objects based on full-wave analysis of electromagnetic scattering by rough surfaces
• Assume isotropic and homogeneous surface