Models wave interference in a coating a few wavelengths thick, which makes reflectance shift with angle and produces the colours of soap films, oil slicks and anodized metal.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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extendsadds capability to Fresnel Equationsinterference in a thin coat makes reflectance shift
References
A Practical Extension to Microfacet Theory for the Modeling of Varying Iridescence — Belcour, Barla — 2017 · link