Thin film interference (a primary factor in iridescence) is a naturally occurring phenomenon in which two out of phase rays of light interfere creating an interesting interference pattern.
I've been experimenting with this phenomenon and am currently recreating a physically accurate model of this using Cycles shaders.
Oil on water
Heat treated metals
Read more on thin film interference: https://en.wikipedia.org/wiki/Thin-film_interference
- Status: Work in Progress