Replaces Phong's reflection vector with the half vector between light and view. Cheaper, and the resulting highlight elongates at grazing angles the way real ones do.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Phongthe half vector is cheaper and behaves at grazing angles
References
Models of Light Reflection for Computer Synthesized Pictures — Blinn — 1977 · link