State of the Art in Interactive Ray Tracing

Ray tracing is one of the most elegant techniques in com-puter graphics. Many phenomena that are difficult orimpossible with other techniques are simple with ray trac-ing, including shadows, reflections, and refracted light.Ray directions, however, have been determined precisely,and this has limited the capabilities of ray tracing. Bydistributing the directions of the rays according to theanalytic function they sample, ray tracing can incorporatefuzzy phenomena. This provides correct and easy solu-tions to some previously unsolved or partially solved prob-lems, including motion blur, depth of field, penumbras,translucency, and fuzzy reflections. Motion blur anddepth of field calculations can be integrated with the visi-ble surface calculations, avoiding the problems found inprevious methods. CR CATEGORIES AND SUBJECT DESCRIPTORS:1.3.7 [Compu te r Graphics]: Three-DimensionalGraphics and Realism; ADDITIONAL