Thomas Annen, Jan Kautz, Frédo Durand, Hans-Peter Seidel. Spherical harmonic Gradients for Mid-Range Illumination. In Alexander Keller, Henrik Wann Jensen, editors, Proceedings of the 15th Eurographics Workshop on Rendering Techniques, Norköping, Sweden, June 21-23, 2004. pages 331-336, Eurographics Association, 2004.
Abstract is missing.