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.
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@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
} }
Citation