Hidden Surfaces, Reflectance and Shading
A three-dimensional line drawing is generally rather unrealistic, except in a few cases (see the Eiffel Tower in Fig. 7.1). To achieve realism in a computer-generated image, lines which could not really be seen by an observer first must be removed. This process has been a common research theme since the first three-dimensional Systems; numerous algorithms have been proposed to solve the problem [Sutherland et al, 1974]. They can be classified into three major categories.
KeywordsObject Space Frame Buffer Depth Buffer Hide Surface Silhouette Edge
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