Metropolis Photon Sampling with Optional User Guidance
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Date
2005
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
We present Metropolis Photon Sampling (MPS), a visual importance-driven algorithm for populating photon maps. Photon Mapping and other particle tracing algorithms fail if the photons are poorly distributed. Our approach samples light transport paths that join a light to the eye, which accounts for the viewer in the sampling process and provides information to improve photon storage. Paths are sampled with a Metropolis-Hastings algorithm that exploits coherence among important light paths. We also present a technique for including user selected paths in the sampling process without introducing bias. This allows a user to provide hints about important paths or reduce variance in specific parts of the image. We demonstrate MPS with a range of scenes and show quantitative improvements in error over standard Photon Mapping and Metropolis Light Transport.
Description
@inproceedings{:10.2312/EGWR/EGSR05/127-138,
booktitle = {Eurographics Symposium on Rendering (2005)},
editor = {Kavita Bala and Philip Dutre},
title = {{Metropolis Photon Sampling with Optional User Guidance}},
author = {Fan, Shaohua and Chenney, Stephen and Lai, Yu-chi},
year = {2005},
publisher = {The Eurographics Association},
ISSN = {1727-3463},
ISBN = {3-905673-23-1},
DOI = {/10.2312/EGWR/EGSR05/127-138}
}