The paper "A Practical Extension to Microfacet Theory for the Modeling of Varying Iridescence" and its source code is available here:
https://belcour.github.io/blog/resear...
Additional reading:
1. http://www.care2.com/greenliving/amaz...
2. https://academy.allaboutbirds.org/how...
3. http://www.cam.ac.uk/research/news/af...
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