| http://www.w3.org/ns/prov#value | - ctors and polygons at a much faster rate, and without any appreciable loss in quality, than was heretofore available under prior art methods. [For a more thorough understanding of Phong shading and shading of polygons, vectors, curves and other objects, see: Bui Tuong-Phong, Illumination For Computer-Generated Images, UTEC-CS c-73-129, July 1973; Tom Duff, Smoothly Shaded Renderings Of Polyhedral
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