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"Phong" refers to two distinct but related things: The Phong reflection model (Ambient + Diffuse + Specular) and Phong shading (normal vector interpolation).

https://en.wikipedia.org/wiki/Phong_reflection_model https://en.wikipedia.org/wiki/Phong_shading




Correct (I over simplified). Neither really applies here because the interpolation is based on barycentric coordinates, which is the Phong part that was probably being referred to.




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