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Plane Parallel Radiance Transport for Global Illumination in Vegetation
Nelson Max1; Curtis Mobley2; Brett Keating1; En-Hua Wu3
Conference NameSpecial Interest Group on Computer Graphics
Source PublicationRendering Techniques ’97
Conference DateAugust 3-8,1997
Conference PlaceLos Angeles, CA

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 bounday 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.

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Document TypeConference paper
Faculty of Science and Technology
Affiliation1.Lawrence Livermore National Laboratory and U. C. Davis
2.Sequoia Scientific ,USA
3.Institute of Software, Academia Sinica
Recommended Citation
GB/T 7714
Nelson Max,Curtis Mobley,Brett Keating,et al. Plane Parallel Radiance Transport for Global Illumination in Vegetation[C]:Springer,1997:239-250.
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