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Extensions of the Linear and Area Lighting Models
March/April 1992 (vol. 12 no. 2)
pp. 31-38

Techniques that aid the realistic rendering of lighting effects achieved from linear (1-D) and area (2-D) light sources are presented. They are based on a radiosity model that can be inserted into any traditional ray tracer. The approach is applied to both a 1-D light, analogous to a fluorescent tube, and to a 2-D light, analogous to a light set into the ceiling.

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Kevin P. Picott, "Extensions of the Linear and Area Lighting Models," IEEE Computer Graphics and Applications, vol. 12, no. 2, pp. 31-38, March-April 1992, doi:10.1109/38.124286
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