The Phong reflection model was developed by [[Bui Tuong Phong]] at the [[University of Utah]], who published it in his 19731975 Ph.D. dissertation.<ref>Bui Tuong Phong, [http://www.cs.northwestern.edu/~ago820/cs395/Papers/Phong_1975.pdf Illumination for computer generated pictures], Communications of ACM 18 (1975), no. 6, 311–317.</ref><ref>University of Utah School of Computing, http://www.cs.utah.edu/school/history/#phong-ref</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.
