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Bounded Radiosity - Illumination on General Surfaces and Clusters

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Abstract
Traditionally, Radiosity algorithms have been restricted to scenes made from planar patches. Most algorithms for
computing form factors and the subdivision criterion for hierarchical methods implicitly assume planar patches.
In this paper, we present a new radiosity algorithm that is solely based on simple geometric information about
surface elements, namely their bounding boxes and cone of normals. Using this information allows to compute
efficient error bounds that can be used for the subdivision oracle and for computing the energy transfer. Due to
the simple interface to geometric objects, our algorithms not only allows for computing illumination on general
curved surfaces, but it can also directly be applied to a hierarchy of clusters. Several examples demonstrate the
advantages of the new approach.