Interactive global illumination in dynamic participating media using selective photon tracing

Global illumination in dynamic participating media is expensive, but in many applications interactivity is required. We use selective photon tracing to compute global illumination, which enables us to update mostly those photon paths that are affected by changes in the media. We enhance this technique by eliminating the need of shooting corrective photons, which leads to a significant speed-up. Also, we adaptively control spatial traced photon density in those regions in which photon-media intersection is more likely. This enables better control of local reconstruction of global illumination. Using our technique we achieve interactive speeds on a simple desktop PC.

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