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Established Date: Jan. 1, 1974
A visible-surface determination method in which each pixel records (in addition to color) its distance from the camera. As each surface is scan converted, overlapping pixels are sorted so that only the ones closest to the camera ultimately get rendered. Although this is great for optimizing reasons, it also prone is to aliasing artifacts. It was developed by Ed Catmull in 1974 at the University of Utah.