The Photon Map in Daylighting Simulation

> graphics and found its way into commercial renderers primarily due to
> its ability to efficiently handle caustics and its straightforward
> integration into existing ray tracing environments. The work presented
> here describes the adaptation of the photon map in the field of
> lighting simulation, particularly in conjunction with daylight. The
> photon map is apt at handling the complex light redirecting properties
> of daylighting systems and is thus a natural choice for this
> application. Physical validity is of great concern, hence a validation
> of the technique using a variety of daylighting systems was carried out
> to express a confidence measure.