Abstract

The delta-function form of the bidirectional reflectance-distribution function (BRDF) is not limited to the case where θ_v = θ_i and ψ_v = ψ_i ± π (rad), but can represent a “glint” in any direction. The conceptual advantage of the BRDF approach is briefly discussed in relation to the continuum of directional distributions actually found between the limits of purely specular “spikes” and completely diffuse reflection.

© 1976 Optical Society of America

Current definitions of reflectance*

Domina Eberle Spencer and Eugene A. Gaston
J. Opt. Soc. Am. 65(10) 1129-1132 (1975)

Comment on “Surface-contribution algorithms for analysis and optimization”*

Berge Tatian
J. Opt. Soc. Am. 66(6) 628-630 (1976)

Comments on analyses of reflection gratings

M. G. Moharam and T. K. Gaylord
J. Opt. Soc. Am. 73(3) 399-401 (1983)

Author’s reply to comments by Tatian

S. H. Brewer
J. Opt. Soc. Am. 66(6) 630-630 (1976)

Optical constants and reflectance of A1-type metallic selenium

Carlo Reale
J. Opt. Soc. Am. 66(12) 1416-1418 (1976)