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<p>An algorithm for compactly and accurately capturing the illumination of a diffuse polyhedral environment caused by an area light source is presented. The algorithm constructs a discontinuity mesh that explicitly represents discontinuities in the radiance function as boundaries between mesh elements. A piecewise quadratic interpolant is used to approximate the radiance function, preserving the discontinuities associated with the edges in the mesh.</p>
Filippo Tampieri, Donald P. Greenberg, Dani Lischinski, "Discontinuity Meshing for Accurate Radiosity", IEEE Computer Graphics and Applications, vol. 12, no. , pp. 25-39, November/December 1992, doi:10.1109/38.163622
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