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A New Ward BRDF Model with Bounded Albedo
Author(s) -
GeislerMoroder David,
Dür Arne
Publication year - 2010
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/j.1467-8659.2010.01735.x
Subject(s) - bidirectional reflectance distribution function , computer science , specular reflection , computer graphics (images) , rendering (computer graphics) , computer graphics , monte carlo method , interception , reflectivity , computer vision , algorithm , mathematics , optics , statistics , ecology , physics , biology
Abstract Due to its realistic appearance, computational convenience, and efficient Monte Carlo sampling, Ward's anisotropic BRDF is widely used in computer graphics for modeling specular reflection. Incorporating the criticism that the Ward and the Ward‐Dür model do not meet energy balance at grazing angles, we propose a modified BRDF that is energy conserving and preserves Helmholtz reciprocity. The new BRDF is computationally cheap to evaluate, admits efficient importance sampling, and thus sustains the main benefits of the Ward model. We show that the proposed BRDF is better suited for fitting measured reflectance data of a linoleum floor used in a real‐world building than the Ward and the Ward‐Dür model.