Primary Sample Space Path Guiding

Guo, Jerry Jinfeng; Bauszat, Pablo; Bikker, Jacco; Eisemann, Elmar

Primary Sample Space Path Guiding

Files

073-082.pdf (15.86 MB)

Date

2018

Authors

Guo, Jerry Jinfeng
Bauszat, Pablo
Bikker, Jacco
Eisemann, Elmar

Publisher

The Eurographics Association

Abstract

Guiding path tracing in light transport simulation has been one of the practical choices for variance reduction in production rendering. For this purpose, typically structures in the spatial-directional domain are built. We present a novel scheme for unbiased path guiding. Different from existing methods, we work in primary sample space. We collect records of primary samples as well as the luminance that the resulting path contributes and build a multiple dimensional structure, from which we derive random numbers that are fed into the path tracer. This scheme is executed completely outside the rendering kernel. We demonstrate that this method is practical and efficient. We manage to reduce variance and zero radiance paths by only working in the primary sample space.

        @inproceedings{10.2312:sre.20181174
,
booktitle = {Eurographics Symposium on Rendering - Experimental Ideas & Implementations
},
editor = {Jakob, Wenzel and Hachisuka, Toshiya
},
title = {{Primary Sample Space Path Guiding
}},
author = {Guo, Jerry Jinfeng and 
Bauszat, Pablo and 
Bikker, Jacco and 
Eisemann, Elmar
},
year = {2018
},
publisher = {The Eurographics Association
},
ISSN = {1727-3463
},
ISBN = {978-3-03868-068-0
},
DOI = {10.2312/sre.20181174
}
}