Interactive refraction on complex static geometry using spherical harmonics

Olivier Génevaux, Frédéric Larue, Jean-Michel Dischler
2006 Proceedings of the 2006 symposium on Interactive 3D graphics and games - SI3D '06  
Accurate refraction, thanks to raytracing, has always been a popular effect in computer graphics imagery. However, its use has been severely hindered in interactive rendering due to the lack of efficient and realistic techniques geared toward polygon oriented rendering. In this paper, a method to achieve realistic and interactive refractive effects through complex static geometry is proposed. It relies on an offline step where many light paths through the object are pre-evaluated. During
more » ... ng, these precomputed paths are used to provide approximations of actual refracted paths through the geometry, enabling further sampling of an environment map. Light paths valuable information, namely final output direction when leaving refractive object, is compressed using frequency domain based spherical harmonics. The matching decompression procedure, entirely offloaded onto graphics hardware, is handled at interactive speed.
doi:10.1145/1111411.1111438 dblp:conf/si3d/GenevauxLD06 fatcat:oqjsexd2tvbvpom3sxyjkk6xsq