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Phong shading refers to an interpolation technique for surface shading in 3D computer graphics. It is also called Phong interpolation[1] or normal-vector interpolation shading.[2] Specifically, it interpolates surface normals across rasterized polygons and computes pixel colors based on the interpolated normals and a reflection model.Phong shading may also refer to the specific combination of Phong interpolation and the Phong reflection model.

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