Ryan S. Overbeck, Ravi Ramamoorthi, William R. Mark. A Real-time Beam Tracer with Application to Exact Soft Shadows. In Jan Kautz, Sumanta N. Pattanaik, editors, Proceedings of the Eurographics Symposium on Rendering Techniques, Grenoble, France, 2007. pages 85-98, Eurographics Association, 2007. [doi]
Abstract is missing.