Radiance
Caching for Efficient Global Illumination Computation
Authors : Jaroslav Køivánek, Pascal Gautron,
Sumanta Pattanaik, Kadi
Bouatouch
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. in
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 spherical or hemispherical 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.
IEEE Transactions on Visualization and Computer Graphics paper