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Gradient-Domain Bidirectional Path Tracing

Proc. Eurographics Symposium on Rendering, 2015

gbdpt

Marco Manzi Markus Kettunen Miika Aittala 
Jaakko Lehtinen 
Fr├ędo Durand 
Matthias Zwicker 
 University of Bern
Aalto University 
Aalto University
Aalto University, NVIDIA
MIT CSAIL 
University of Bern 

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 as 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.

Materials

publication, results and comparisons, slides

Code

Avalilable on the gradient-domain path tracing project page.

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