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Illumination for Computer-Generated Images
UTAH UNIV SALT LAKE CITY SCHOOL OF COMPUTING
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This report describes a new model for the shading of computer- generated images of objects in general and of polygonally described free-form curved surfaces in particular. The shading function is determined by a linear interpolation of the curvature of the surface. It takes into consideration the physical properties of the materials of which the surfaces are made. By applying the fundamental laws of optics, highlights due to the specular reflection of the light are simulated, and other existing shading problems are overcome. This results in computer-generated images of increased realism. A large number of sample pictures are provided to give a pictorial comparison of the new shading process with past methods. Finally, pictures of simple real solids, such as cylinders, spheres and cones, are compared with those generated by the computer.
APPROVED FOR PUBLIC RELEASE