Extending Separable Subsurface Scattering to Arbitrary Materials

Information

• Publication Type: Master Thesis
• Workgroup(s)/Project(s):
  • Rendering and Modeling
• Date: January 2015
• First Supervisor:
  • Michael Wimmer
  • Karoly Zsolnai-Fehér
• Keywords: subsurface scattering, real-time

Abstract

This thesis proposes extensions for the Separable Subsurface Scattering algorithm to support arbitrary materials. Four separable (rank-1) kernel models for the approximation of physically based diffuse reflectance profiles are presented. Each model offers different approximation quality and controllability. The first two models are based on singular value decomposition and a custom analytic pre-integration scheme. They enable fast deterministic kernel computation and provide fixed-quality solutions. Two additional parametrized models are based on automatic and manual optimization and provide more control over the approximation quality but are more time-consuming to generate. Higher rank approximations can be computed using the approach based on singular value decomposition. All four kernel models are used to compute approximations for physically measured diffuse reflectance profiles of different materials and tested using several special-case irradiance signals and complex proof-of-concept scenes. The results are compared to the state of the art in realtime rendering of subsurface scattering, showing comparable approximation quality at lower computational cost. The proposed extensions enable rendering of physically based subsurface scattering for arbitrary materials and dynamic scenes in real time.

https://www.youtube.com/watch?v=P0Tkr4HaIVk

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BibTeX

@mastersthesis{Freude_MSc,
  title =      "Extending Separable Subsurface Scattering to Arbitrary
               Materials",
  author =     "Christian Freude",
  year =       "2015",
  abstract =   "This thesis proposes extensions for the Separable Subsurface
               Scattering algorithm to support arbitrary materials. Four
               separable (rank-1) kernel models for the approximation of
               physically based diffuse reflectance profiles are presented.
               Each model offers different approximation quality and
               controllability. The first two models are based on singular
               value decomposition and a custom analytic pre-integration
               scheme. They enable fast deterministic kernel computation
               and provide fixed-quality solutions. Two additional
               parametrized models are based on automatic and manual
               optimization and provide more control over the approximation
               quality but are more time-consuming to generate. Higher rank
               approximations can be computed using the approach based on
               singular value decomposition. All four kernel models are
               used to compute approximations for physically measured
               diffuse reflectance profiles of different materials and
               tested using several special-case irradiance signals and
               complex proof-of-concept scenes. The results are compared to
               the state of the art in realtime rendering of subsurface
               scattering, showing comparable approximation quality at
               lower computational cost. The proposed extensions enable
               rendering of physically based subsurface scattering for
               arbitrary materials and dynamic scenes in real time. 
               https://www.youtube.com/watch?v=P0Tkr4HaIVk",
  month =      jan,
  address =    "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
  school =     "Institute of Computer Graphics and Algorithms, Vienna
               University of Technology ",
  keywords =   "subsurface scattering, real-time",
  URL =        "https://www.cg.tuwien.ac.at/research/publications/2015/Freude_MSc/",
}