Plane parallel radiance transport for global illumination in vegetation

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This paper applies plane parallel radiance transport techniques to scattering from vegetation. The leaves, stems, and branches are represented as a volume density of scattering surfaces, depending only on height and the vertical component of the surface normal. Ordinary differential equations are written for the multiply scattered radiance as a function of the height above the ground, with the sky radiance and ground reflectance as boundary conditions. They are solved using a two-pass integration scheme to unify the two-point boundary conditions, and Fourier series for the dependence on the azimuthal angle. The resulting radiance distribution is used to precompute diffuse ... continued below

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19 p.

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Max, N.; Mobley, C.; Keating, B. & Wu, E.H. January 5, 1997.

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Description

This paper applies plane parallel radiance transport techniques to scattering from vegetation. The leaves, stems, and branches are represented as a volume density of scattering surfaces, depending only on height and the vertical component of the surface normal. Ordinary differential equations are written for the multiply scattered radiance as a function of the height above the ground, with the sky radiance and ground reflectance as boundary conditions. They are solved using a two-pass integration scheme to unify the two-point boundary conditions, and Fourier series for the dependence on the azimuthal angle. The resulting radiance distribution is used to precompute diffuse and specular `ambient` shading tables, as a function of height and surface normal, to be used in rendering, together with a z-buffer shadow algorithm for direct solar illumination.

Physical Description

19 p.

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OSTI as DE98057426

Other: FDE: PDF; PL:

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  • 24. international ACM conference on computer graphics and interactive techniques, Los Angeles, CA (United States), 3-8 Aug 1997

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  • Other: DE98057426
  • Report No.: UCRL-JC--126062
  • Report No.: CONF-970811--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 649229
  • Archival Resource Key: ark:/67531/metadc703463

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  • January 5, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 2:32 p.m.

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Max, N.; Mobley, C.; Keating, B. & Wu, E.H. Plane parallel radiance transport for global illumination in vegetation, article, January 5, 1997; California. (digital.library.unt.edu/ark:/67531/metadc703463/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.