Proceedings: GI 2000

Approximation of Glossy Reflection with Prefiltered Environment Maps

Jan Kautz , Michael McCool

Proceedings of Graphics Interface 2000: Montréal, Québec, Canada, 15 - 17 May 2000, 119-126

DOI 10.20380/GI2000.17

  • BibTeXex

    @inproceedings{KM-gi2000,
     title = {Approximation of Glossy Reflection with Prefiltered Environment Maps},
     author = {Jan Kautz and Michael D. McCool},
     booktitle = {Proceedings of the Graphics Interface 2000 Conference, May 15-17, 2000, Montr{'{e}}al, Qu{'{e}}bec, Canada},
     year = {2000},
     month = {May},
     pages = {119--126},
     url = {http://graphicsinterface.org/wp-content/uploads/gi2000-17.pdf}
    }
    

Abstract

A method is presented that can render glossy reflections with arbitrary isotropic bidirectional reflectance distribution functions (BRDFs) at interactive rates using texture mapping. This method is based on the well-known environment map technique for specular reflections. Our approach uses a single- or multilobe representation of bidirectional reflectance distribution functions, where the shape of each radially symmetric lobe is also a function of view elevation. This approximate representation can be computed efficiently using local greedy fitting techniques. Each lobe is used to filter specular environment maps during a preprocessing step, resulting in a three-dimensional environment map. For many BRDFs, simplifications using lower-dimensional approximations, coarse sampling with respect to view elevation, and small numbers of lobes can still result in a convincing approximation to the true surface reflectance.