Adaptive Shadow Testing for Ray Tracing

TitleAdaptive Shadow Testing for Ray Tracing
Publication TypeConference Paper
Year of Publication1991
AuthorsGregory J Ward
Conference Name1991 European Rendering Workshop Conference
Call NumberLBL-30647

We present a simple technique for improving the efficiency of ray tracing in scenes with a large number of light sources. The sources are sorted according to their potential contribution, and only those sources whose shadows are above a specified threshold are tested. The remainder are added into the result in proportion to a statistical estimate of their visibility. The algorithm requires very little storage, and produces no objectionable artifacts.

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