Imperfect shadow maps for efficient computation of indirect illumination

@article{Ritschel2008ImperfectSM,
  title={Imperfect shadow maps for efficient computation of indirect illumination},
  author={Tobias Ritschel and Thorsten Grosch and Min H. Kim and Hans-Peter Seidel and Carsten Dachsbacher and Jan Kautz},
  journal={ACM Trans. Graph.},
  year={2008},
  volume={27},
  pages={129:1-129:8}
}
We present a method for interactive computation of indirect illumination in large and fully dynamic scenes based on approximate visibility queries. While the high-frequency nature of direct lighting requires accurate visibility, indirect illumination mostly consists of smooth gradations, which tend to mask errors due to incorrect visibility. We exploit this by approximating visibility for indirect illumination with imperfect shadow maps---low-resolution shadow maps rendered from a crude point… CONTINUE READING
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