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Show 1 LITERATURE SEARCH This section of the thesis describes previous work in computer graphics related to texture mapping. Several other articles pertaining to antialiasing and ray tracing are also mentioned, since they are of importance to the thesis topic. 1.1 Review of Texture Mapping The idea of improving the quality of computer generated images by adding texture was introduced by Catmull (7]. Catmull used a texture map consisting of reflection coefficients determined by sampling an image. This same idea was extended by Blinn and Newell /4/ to map synthetically generated textures onto surfaces. Blinn went on to describe a method of "bump mapping," that is, perturbing surface normals to produce textured surfaces (6]. During the same year Dungan, Stenger, and Sutty proposed texture tiles as a way of mapping textures onto surfaces [16]. Catmull and Smith [Bj also investigated ways of adding these methods into scanline rendering algorithms to increase efficiency. Continuing interest in texture has produced many advances. Texture mapping has been adapted to ray tracing by Whitted {45]. Williams presented a method of prefiltering maps using pyramidal parametric functions for texturing curved surfaces {46]. An article by Cook [19} briefly mentioned "displacement maps," a |
