Approximation of Glossy Reflection with Prefiltered Environment Maps
| Autor: | Kautz, Jan, McCool, Michael |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2000 |
| Předmět: | |
| DOI: | 10.20380/gi2000.17 |
| Popis: | Proceedings of Graphics Interface 2000, Montréal, Québec, Canada, Canada, 15 - 17 May 2000, 119-126 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|