Subdivision Next-Event Estimation for Path-Traced Subsurface Scattering
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Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
We present subdivision next-event estimation (SNEE) for unbiased Monte Carlo simulation of subsurface scattering. Our technique is designed to sample high frequency illumination through geometrically complex interfaces with highly directional scattering lobes enclosing a scattering medium. This case is difficult to sample and a common source of image noise. We explore the idea of exploiting the degree of freedom given by path vertices within the interior medium to find two-bounce connections to the light that satisfy the law of refraction. SNEE first finds a surface point by tracing a probe ray and then performs a subdivision step to place an intermediate vertex within the medium according to the incoming light at the chosen surface point. Our subdivision construction ensures that the path will connect to the light while obeying Fermat's principle of least time. We discuss the details of our technique and demonstrate the benefits of integrating SNEE into a forward path tracer.
Description
@inproceedings{10.2312:sre.20161214,
booktitle = {Eurographics Symposium on Rendering - Experimental Ideas & Implementations},
editor = {Elmar Eisemann and Eugene Fiume},
title = {{Subdivision Next-Event Estimation for Path-Traced Subsurface Scattering}},
author = {Koerner, David and Novak, Jan and Kutz, Peter and Habel, Ralf and Jarosz, Wojciech},
year = {2016},
publisher = {The Eurographics Association},
ISSN = {1727-3463},
ISBN = {978-3-03868-019-2},
DOI = {10.2312/sre.20161214}
}