@inproceedings{23480,
  author = {Gregory J Ward},
  title = {Adaptive Shadow Testing for Ray Tracing},
  abstract = {<p>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.</p>},
  year = {1991},
  journal = {1991 European Rendering Workshop Conference},
  language = {eng},
}