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Dani Lischinski, Filippo Tampieri, Donald P. Greenberg, "Discontinuity Meshing for Accurate Radiosity," IEEE Computer Graphics and Applications, vol. 12, no. 6, pp. 2539, November/December, 1992.  
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@article{ 10.1109/38.163622, author = {Dani Lischinski and Filippo Tampieri and Donald P. Greenberg}, title = {Discontinuity Meshing for Accurate Radiosity}, journal ={IEEE Computer Graphics and Applications}, volume = {12}, number = {6}, issn = {02721716}, year = {1992}, pages = {2539}, doi = {http://doi.ieeecomputersociety.org/10.1109/38.163622}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, }  
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TY  MGZN JO  IEEE Computer Graphics and Applications TI  Discontinuity Meshing for Accurate Radiosity IS  6 SN  02721716 SP25 EP39 EPD  2539 A1  Dani Lischinski, A1  Filippo Tampieri, A1  Donald P. Greenberg, PY  1992 VL  12 JA  IEEE Computer Graphics and Applications ER   
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.
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