BRDF Measurement Modelling using Wavelets for Efficient Path Tracing
| Autor: | Mathias Paulin, Luc Claustres, Yannick Boucher |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Global illumination
Computer science business.industry Monte Carlo method ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION 020206 networking & telecommunications 020207 software engineering 02 engineering and technology Computer Graphics and Computer-Aided Design Wavelet Path tracing 0202 electrical engineering electronic engineering information engineering Computer vision Bidirectional reflectance distribution function Artificial intelligence Physically based rendering Graphics business Algorithm Importance sampling ComputingMethodologies_COMPUTERGRAPHICS |
| Zdroj: | Computer Graphics Forum. 22:701-716 |
| ISSN: | 0167-7055 |
| DOI: | 10.1111/j.1467-8659..00718.x |
| Popis: | Physically based rendering needs numerical models from real measurements, or analytical models from material definitions, of the Bidirectional Reflectance Distribution Function (BRDF). However, measured BRDF data sets are too large and provide no functionalities to be practically used in Monte Carlo path tracing algorithms. In this paper, we present a wavelet-based generic BRDF model suitable for both physical analysis and path tracing. The model is based on the separation of spectral and geometrical aspect of the BRDF and allows a compact and efficient representation of isotropic, anisotropic and/or spectral BRDFs. After a brief survey of BRDF and wavelet theory, we present our software architecture for generic wavelet transform and how to use it to model BRDFs. Then, modelling results are presented on real and virtual BRDF measurements. Finally, we show how to exploit the multiresolution property of the wavelet encoding to reduce the variance by importance sampling in a path tracing algorithm. ACM CSS: I.3.7 Computer Graphics—Three-Dimensional Graphics and Realism |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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