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Abstract

In this paper we propose an efficient algorithm
for handling strong secondary light sources
within the photon mapping framework. We introduce
an additional photon map as an implicit representation
of such light sources. At the
rendering stage this map is used for the explicit
sampling of strong indirect lighting in a similar
way as it is usually performed for primary light
sources. Our technique works fully automatically,
improves the computation performance, and leads to
a better image quality than traditional rendering
approaches.