Approximates Fresnel reflectance as a fifth-power interpolation between normal incidence reflectance and one. Accurate enough for dielectrics and cheap enough for a pixel shader.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
Colour is the family; a dashed line is the second member of it.
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approximatesis a cheaper stand-in for Fresnel Equationsa fifth-power curve instead of the full equations
References
An Inexpensive BRDF Model for Physically-based Rendering — Schlick — 1994 · link