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Reports (Research Report) Year : 2004

Radiance Caching for Efficient Global Illumination Computation


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 of \cite{ward88ray} 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 glossiness of their BRDF. We also propose a novel method for computing translational radiance gradient at a point.
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Dates and versions

inria-00070734 , version 1 (19-05-2006)


  • HAL Id : inria-00070734 , version 1


Jaroslav Krivánek, Pascal Gautron, Sumanta N. Pattanaik, Kadi Bouatouch. Radiance Caching for Efficient Global Illumination Computation. [Research Report] RR-5264, INRIA. 2004, pp.17. ⟨inria-00070734⟩
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