An Error Bound for Decoupled Visibility with Application to Relighting
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Date
2011
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
Monte Carlo estimation of direct lighting is often dominated by visibility queries. If an error is tolerable, the calculations can be sped up by using a simple scalar occlusion factor per light source to attenuate radiance, thus decoupling the expensive estimation of visibility from the comparatively cheap sampling of unshadowed radiance and BRDF. In this paper we analyze the error associated with this approximation and derive an upper bound. We demonstrate in a simple relighting application how our result can be used to reduce noise by introducing a controlled error if a reliable estimate of the visibility is already available.
Description
@inproceedings{10.2312:EG2011/short/025-028,
booktitle = {Eurographics 2011 - Short Papers},
editor = {N. Avis and S. Lefebvre},
title = {{An Error Bound for Decoupled Visibility with Application to Relighting}},
author = {Schwenk, Karsten and Fellner, Dieter W.},
year = {2011},
publisher = {The Eurographics Association},
ISSN = {1017-4656},
ISBN = {},
DOI = {10.2312/EG2011/short/025-028}
}