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Light diffusion in multi-layered translucent materials

Published: 01 July 2005 Publication History

Abstract

This paper introduces a shading model for light diffusion in multi-layered translucent materials. Previous work on diffusion in translucent materials has assumed smooth semi-infinite homogeneous materials and solved for the scattering of light using a dipole diffusion approximation. This approximation breaks down in the case of thin translucent slabs and multi-layered materials. We present a new efficient technique based on multiple dipoles to account for diffusion in thin slabs. We enhance this multipole theory to account for mismatching indices of refraction at the top and bottom of of translucent slabs, and to model the effects of rough surfaces. To model multiple layers, we extend this single slab theory by convolving the diffusion profiles of the individual slabs. We account for multiple scattering between slabs by using a variant of Kubelka-Munk theory in frequency space. Our results demonstrate diffusion of light in thin slabs and multi-layered materials such as paint, paper, and human skin.

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cover image ACM Transactions on Graphics
ACM Transactions on Graphics  Volume 24, Issue 3
July 2005
826 pages
ISSN:0730-0301
EISSN:1557-7368
DOI:10.1145/1073204
Issue’s Table of Contents
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Publication History

Published: 01 July 2005
Published in TOG Volume 24, Issue 3

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Author Tags

  1. BSSRDF
  2. diffusion theory
  3. global illumination
  4. layered materials
  5. light transport
  6. realistic image synthesis
  7. reflection models
  8. subsurface scattering

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