Phong

Computer Graphics · Materials and BSDFs · 1975 · phong.yaml

An empirical specular lobe: the cosine between the reflection vector and the view, raised to a power. No physical basis, but it was the first shading model cheap enough to be ubiquitous.

• 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.

This node

• specializesis a specific case of Specular Reflectionan ad hoc cosine-power lobe with no physical basis

Referenced by

• correctsBlinn-Phong fixes a defect in thisthe half vector is cheaper and behaves at grazing angles

References

• Illumination for Computer Generated Pictures — Phong — 1975 · link
• Background — Phong reflection model on Wikipedia