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    Gradient-Domain Bidirectional Path Tracing

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    Date
    2015
    Author
    Manzi, Marco
    Kettunen, Markus
    Aittala, Miika
    Lehtinen, Jaakko
    Durand, Frédo
    Zwicker, Matthias
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    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.
    BibTeX
    @inproceedings {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},
    DOI = {10.2312/sre.20151168}
    }
    URI
    http://dx.doi.org/10.2312/sre.20151168
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