Practical Product Sampling for Single Scattering in Media

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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
Efficient Monte-Carlo estimation of volumetric single scattering remains challenging due to various sources of variance, including transmittance, phase-function anisotropy, geometric cosine foreshortening, and squared-distance fall-off. We propose several complementary techniques to importance sample each of these terms and their product. First, we introduce an extension to equi-angular sampling to analytically account for the foreshortening at point-normal emitters. We then include transmittance and phase function via Taylor-series expansion and/or warp composition. Scaling to complex mesh emitters is achieved through an adaptive tree-splitting scheme. We show improved performance over state-of-the-art baselines in a diversity of scenarios.
Description

        
@inproceedings{
10.2312:sr.20211290
, booktitle = {
Eurographics Symposium on Rendering - DL-only Track
}, editor = {
Bousseau, Adrien and McGuire, Morgan
}, title = {{
Practical Product Sampling for Single Scattering in Media
}}, author = {
Villeneuve, Keven
and
Gruson, Adrien
and
Georgiev, Iliyan
and
Nowrouzezahrai, Derek
}, year = {
2021
}, publisher = {
The Eurographics Association
}, ISSN = {
1727-3463
}, ISBN = {
978-3-03868-157-1
}, DOI = {
10.2312/sr.20211290
} }
Citation