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Phong shading refers to a set of techniques in 3D computer graphics. Phong shading combines a model for the reflection of light from surfaces with a compatible method of estimating pixel colors using interpolation of surface normals across rasterized polygons.
These methods were developed by Bui Tuong Phong, who published them in his 1973 Ph.D. dissertation at the University of Utah.
The model of reflection may also be referred to as the Phong reflection model, Phong illumination or Phong lighting. It may be called Phong shading in the context of pixel shaders or other places where a lighting calculation can be referred to as "shading".
The interpolation method may also be called Phong interpolation, and is also usually what is referred to by "per-pixel lighting". Typically it is called "shading" when being contrasted with other interpolation methods such as Gouraud shading or flat shading. The Phong reflection model may be used in conjunction with any of these interpolation methods.
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