GSoC/GCI Archive
Google Summer of Code 2010 YafaRay (Yet Another Free Raytracer)

Progressive Photon Mapping

by ryen for YafaRay (Yet Another Free Raytracer)

Progressive photon mapping is a multi-pass algorithm where the first pass is ray tracing followed by any number of photon tracing passes. Each photon tracing pass results in an increasingly accurate global illumination solution that can be visualized in order to provide progressive feedback.