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Azimuthal Scattering from Elliptical Hair Fibers

Published: 03 April 2017 Publication History

Abstract

The appearance of hair follows from the small-scale geometry of hair fibers, with the cross-sectional shape determining the azimuthal distribution of scattered light. Although previous research has described some of the effects of non-circular cross sections, no accurate scattering models for non-circular fibers exist. This article presents a scattering model for elliptical fibers, which predicts that even small deviations from circularity produce important changes in the scattering distribution and which disagrees with previous approximations for the effects of eccentricity.
To confirm the model’s predictions, new scattering measurements of fibers from a wide range of hair types were made, using a new measurement device that provides a more complete and detailed picture of the light scattered by fibers than was previously possible. The measurements show features that conclusively match the model’s predictions, but they also contain an ideal-specular forward-scattering behavior that is not predicted and has not been fully described before.
The results of this article indicate that an accurate and efficient method for computing scattering in elliptical cylinders—something not provided in this article—is the correct model to use for realistic hair in the future and that the new specular behavior should be included as well.

Supplementary Material

khungurn (khungurn.zip)
Supplemental movie, appendix, image and software files for, Azimuthal Scattering from Elliptical Hair Fibers

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cover image ACM Transactions on Graphics
ACM Transactions on Graphics  Volume 36, Issue 2
April 2017
168 pages
ISSN:0730-0301
EISSN:1557-7368
DOI:10.1145/3068851
Issue’s Table of Contents
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Association for Computing Machinery

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Publication History

Published: 03 April 2017
Accepted: 01 November 2016
Revised: 01 October 2016
Received: 01 April 2015
Published in TOG Volume 36, Issue 2

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Author Tags

  1. Hair
  2. fibers
  3. optical scattering
  4. rendering

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