Using the on-axis BSDF at a dielectric surface to model the BSDF at off-axis angles

William J. Cassarly

doi:10.1117/12.897290

21 September 2011 Using the on-axis BSDF at a dielectric surface to model the BSDF at off-axis angles

William J. Cassarly

Proceedings Volume 8170, Illumination Optics II; 81700L (2011) https://doi.org/10.1117/12.897290
Event: SPIE Optical Systems Design, 2011, Marseille, France

Abstract

The Bidirectional scattering distribution function (BSDF) is used to describe the multidimensional aspect of light scattering properties of a surface. Often, the BSDF is broken into the two parts: the bidirectional reflectance distribution function (BRDF), and the bidirectional transmittance distribution function (BTDF). In this paper, we investigate the onaxis BTDF at a dielectric surface (i.e., a surface where the index of refraction is different on the two sides of the surface) and show how it relates to the off-axis BRDF and BTDF of textured surfaces that are commonly used in illumination modeling and design. Numerous interesting Monte Carlo simulation results are provided.

Citation Download Citation

William J. Cassarly "Using the on-axis BSDF at a dielectric surface to model the BSDF at off-axis angles", Proc. SPIE 8170, Illumination Optics II, 81700L (21 September 2011); https://doi.org/10.1117/12.897290

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