It's really not a rendering bug, you see

@article{Woo1996ItsRN,
  title={It's really not a rendering bug, you see},
  author={Andrew Woo and Andrew Pearce and Marc J. Ouellette},
  journal={IEEE Computer Graphics and Applications},
  year={1996},
  volume={16},
  pages={21-25}
}
Most rendering algorithms deliberately employ approximations and other shortcuts for efficiency. [] Key Result This imbalance warrants more research into proper solutions to these and similar problems.

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