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Radiance is a simulation suite that is intended to aid
researchers, lighting designers and architects by predicting
the light levels and appearance of a space prior to construction. The
package includes programs for modeling and translating scene geometry,
luminaire data and material properties, all of which are needed as input to
the simulation. The lighting simulation itself uses ray tracing techniques
to compute radiance values, which are typically arranged to
form a photographic quality image. The resulting image may be analyzed,
displayed and manipulated within the package, and converted to other popular
image file formats for export to other packages, facilitating the production
of hard copy output.