@ARTICLE{Krivanek:2005:RCE,
author={K{\v{r}}iv{\'a}nek, Jaroslav and Gautron, Pascal and Pattanaik, Sumanta and Bouatouch, Kadi},
journal={Visualization and Computer Graphics, IEEE Transactions on},
title={Radiance caching for efficient global illumination computation},
year={2005},
month={sept.-oct. },
volume={11},
number={5},
pages={550 -561},
abstract={In this paper, we present a ray tracing-based method for accelerated global illumination computation in scenes with low-frequency glossy BRDFs. The method is based on sparse sampling, caching, and interpolating radiance on glossy surfaces. In particular, we extend the irradiance caching scheme proposed by Ward et al. (1988) to cache and interpolate directional incoming radiance instead of irradiance. The incoming radiance at a point is represented by a vector of coefficients with respect to a hemispherical or spherical basis. The surfaces suitable for interpolation are selected automatically according to the roughness of their BRDF. We also propose a novel method for computing translational radiance gradient at a point.},
keywords={global illumination computation;hemispherical harmonics;irradiance caching scheme;low-frequency glossy BRDF scenes;radiance caching;radiance interpolation;ray tracing;sparse sampling;spherical harmonics;Monte Carlo methods;brightness;image sampling;interpolation;lighting;ray tracing;Algorithms;Computer Graphics;Image Enhancement;Image Interpretation, Computer-Assisted;Imaging, Three-Dimensional;Information Storage and Retrieval;Lighting;},
doi={10.1109/TVCG.2005.83},
url = {http://dx.doi.org/10.1109/TVCG.2005.83},
ISSN={1077-2626},
}