Gradient-Domain Bidirectional Path Tracing
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Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
Gradient-domain path tracing has recently been introduced as an efficient realistic image synthesis algorithm. This paper introduces a bidirectional gradient-domain sampler that outperforms traditional bidirectional path tracing often by a factor of two to five in terms of squared error at equal render time. It also improves over unidirectional gradient-domain path tracing in challenging visibility conditions, similarly to how conventional bidirectional path tracing improves over its unidirectional counterpart. Our algorithm leverages a novel multiple importance sampling technique and an efficient implementation of a high-quality shift mapping suitable for bidirectional path tracing. We demonstrate the versatility of our approach in several challenging light transport scenarios.
Description
@inproceedings{10.2312:sre.20151168,
booktitle = {Eurographics Symposium on Rendering - Experimental Ideas & Implementations},
editor = {Jaakko Lehtinen and Derek Nowrouzezahrai},
title = {{Gradient-Domain Bidirectional Path Tracing}},
author = {Manzi, Marco and Kettunen, Markus and Aittala, Miika and Lehtinen, Jaakko and Durand, Frédo and Zwicker, Matthias},
year = {2015},
publisher = {The Eurographics Association},
ISBN = {},
DOI = {10.2312/sre.20151168}
}