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Phong reflection model
The Phong reflection model (also called Phong illumination or Phong lighting) is an empirical model of the local illumination of points on a surface. In 3D computer graphics, it is sometimes ambiguously referred to as "Phong shading", in particular if the model is used in combination with the interpolation method of the same name and in the context of pixel shaders or other places where a lighting calculation can be referred to as “shading”.
== History ==
The Phong reflection model was developed by Bui Tuong Phong at the University of Utah, who published it in his 1973 Ph.D. dissertation.〔Bui Tuong Phong, (Illumination for computer generated pictures ), Communications of ACM 18 (1975), no. 6, 311–317.〕〔University of Utah School of Computing, http://www.cs.utah.edu/school/history/#phong-ref〕 It was published in conjunction with a method for interpolating the calculation for each individual pixel that is rasterized from a polygonal surface model; the interpolation technique is known as Phong shading, even when it is used with a reflection model other than Phong's. Phong's methods were considered radical at the time of their introduction, but have since become the de facto baseline shading method for many rendering applications. Phong's methods have proven popular due to their generally efficient use of computation time per rendered pixel.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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