Gradient-Domain Bidirectional Path Tracing

Manzi, Marco; Kettunen, Markus; Aittala, Miika; Lehtinen, Jaakko; Durand, Frédo; Zwicker, Matthias

Gradient-Domain Bidirectional Path Tracing

Files

065-074.pdf (7.8 MB)

supp_mat.zip (41.47 MB)

Date

2015

Authors

Manzi, Marco
Kettunen, Markus
Aittala, Miika
Lehtinen, Jaakko
Durand, Frédo
Zwicker, Matthias

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.

        @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
}
}