Multiple Scattering Approximation in Heterogeneous Media by Narrow Beam Distributions

Fast realistic rendering of objects in scattering media is still a challenging topic in computer graphics. In presence of participating media, a light beam is repeatedly scattered by media particles, changing direction and getting spread out. Explicitly evaluating this beam distribution would enable...

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Bibliographic Details
Published in:Computer graphics forum Vol. 35; no. 7; pp. 373 - 382
Main Authors: Shinya, Mikio, Dobashi, Yoshinori, Shiraishi, Michio, Kawashima, Motonobu, Nishita, Tomoyuki
Format: Journal Article
Language:English
Published: Oxford Blackwell Publishing Ltd 01.10.2016
Subjects:
Analysis
Approximation
Beams (radiation)
Categories and Subject Descriptors (according to ACM CCS)
Computer graphics
Estimating techniques
Exact solutions
I.3.3 [Computer Graphics]: Picture/Image Generation
Image processing systems
Light
Mathematical analysis
Media
Rendering
Scattering
Studies
ISSN:0167-7055, 1467-8659
Online Access:Get full text
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Summary:Fast realistic rendering of objects in scattering media is still a challenging topic in computer graphics. In presence of participating media, a light beam is repeatedly scattered by media particles, changing direction and getting spread out. Explicitly evaluating this beam distribution would enable efficient simulation of multiple scattering events without involving costly stochastic methods. Narrow beam theory provides explicit equations that approximate light propagation in a narrow incident beam. Based on this theory, we propose a closed‐form distribution function for scattered beams. We successfully apply it to the image synthesis of scenes in which scattering occurs, and show that our proposed estimation method is more accurate than those based on the Wentzel‐Kramers‐Brillouin (WKB) theory.
Bibliography:Supporting InformationSupporting Information
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ArticleID:CGF13034
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ISSN:0167-7055
1467-8659
DOI:10.1111/cgf.13034