Energy redistribution path tracing
David Cline, Justin Talbot, Parris Egbert
In ACM Transactions on Graphics, 24(3), August 2005.
Abstract: We present Energy Redistribution (ER) sampling as an unbiased method to solve correlated integral problems. ER sampling is a hybrid algorithm that uses Metropolis sampling-like mutation strategies in a standard Monte Carlo integration setting, rather than resorting to an intermediate probability distribution step. In the context of global illumination, we present Energy Redistribution Path Tracing (ERPT). Beginning with an inital set of light samples taken from a path tracer, ERPT uses path mutations to redistribute the energy of the samples over the image plane to reduce variance. The result is a global illumination algorithm that is conceptually simpler than Metropolis Light Transport (MLT) while retaining its most powerful feature, path mutation. We compare images generated with the new technique to standard path tracing and MLT.
Keyword(s): Monte Carlo integration, correlated integrals, energy redistribution,global illumination, metropolis light transport, path tracing
@article{Cline:2005:ERP,
author = {David Cline and Justin Talbot and Parris Egbert},
title = {Energy redistribution path tracing},
journal = {ACM Transactions on Graphics},
volume = {24},
number = {3},
pages = {1186--1195},
month = aug,
year = {2005},
}
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