An Energy-Conserving Hair Reflectance Model

We present a reflectance model for dielectric cylinders with rough surfaces such as human hair fibers. Our model is energy conserving and can evaluate arbitrarily many orders of internal reflection. Accounting for compression and contraction of specular cones produces a new longitudinal scattering f...

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Bibliographic Details
Published in:Computer graphics forum Vol. 30; no. 4; pp. 1181 - 1187
Main Authors: d'Eon, Eugene, Francois, Guillaume, Hill, Martin, Letteri, Joe, Aubry, Jean-Marie
Format: Journal Article
Language:English
Published: Oxford, UK Blackwell Publishing Ltd 01.06.2011
Subjects:
Accounting
Caustics
Dielectrics
Fibers
Hair
I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism-Shading
Mathematical models
Reflectance
Reflectivity
Roughness
Studies
ISSN:0167-7055, 1467-8659
Online Access:Get full text
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Summary:We present a reflectance model for dielectric cylinders with rough surfaces such as human hair fibers. Our model is energy conserving and can evaluate arbitrarily many orders of internal reflection. Accounting for compression and contraction of specular cones produces a new longitudinal scattering function which is non‐Gaussian and includes an off‐specular peak. Accounting for roughness in the azimuthal direction leads to an integral across the hair fiber which is efficiently evaluated using a Gaussian quadrature. Solving cubic equations is avoided, caustics are included in the model in a consistent fashion, and more accurate colors are predicted by considering many internal pathways.
Bibliography:ark:/67375/WNG-PLNHG0P8-0
istex:66AD849BFCD0223938E1FDAFF92A8437D107BCF8
ArticleID:CGF1976
SourceType-Scholarly Journals-1
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ISSN:0167-7055
1467-8659
DOI:10.1111/j.1467-8659.2011.01976.x