Physically-based simulation of rainbows

@article{Sadeghi2012PhysicallybasedSO,
  title={Physically-based simulation of rainbows},
  author={Iman Sadeghi and Adolfo Mu{\~n}oz and Philip Laven and Wojciech Jarosz and Francisco J. Ser{\'o}n and Diego Gutierrez and Henrik Wann Jensen},
  journal={ACM Trans. Graph.},
  year={2012},
  volume={31},
  pages={3:1-3:12}
}
In this article, we derive a physically-based model for simulating rainbows. Previous techniques for simulating rainbows have used either geometric optics (ray tracing) or Lorenz-Mie theory. Lorenz-Mie theory is by far the most accurate technique as it takes into account optical effects such as dispersion, polarization, interference, and diffraction. These effects are critical for simulating rainbows accurately. However, as Lorenz-Mie theory is restricted to scattering by spherical particles… 

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