The photon map technique for global illumination does not specifically address animated scenes. In particular,
prior work has not considered the problem of temporal sampling (motion blur) while using the photon map. In this
paper we examine several approaches for simulating motion blur with the photon map. In particular we show that
a distribution of photons in time combined with the standard photon map radiance estimate is incorrect, and we
introduce a simple generalization that correctly handles photons distributed in both time and space. Our results
demonstrate that this time dependent photon map extension allows fast and correct estimates of motion-blurred
illumination including motion-blurred caustics.
