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Multiple Scattering Approximation in Heterogeneous Media by Narrow Beam Distributions
Author(s) -
Shinya Mikio,
Dobashi Yoshinori,
Shiraishi Michio,
Kawashima Motonobu,
Nishita Tomoyuki
Publication year - 2016
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/cgf.13034
Subject(s) - rendering (computer graphics) , scattering , computer science , computer graphics , wkb approximation , optics , light scattering , graphics , physics , computer graphics (images) , quantum mechanics
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.