Min Chen, James Arvo. Simulating Non-Lambertian Phenomena Involving Linearly-Varying Luminaires. In Steven J. Gortler, Karol Myszkowski, editors, Proceedings of the 12th Eurographics Workshop on Rendering Techniques, London, UK, June 25-27, 2001. pages 25-38, Springer, 2001.
Abstract is missing.