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Computing (FOLDOC) dictionary
Z-buffer
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graphics An array used to store the maximum Z coordinate
of any feature plotted at a given (X, Y) location on the
screen, used for hidden line removal in a 2D rendering of a
3D scene. The Z axis is perpendicular to the screen with
values increasing toward the viewer so that any point whose Z
coordinate is less than the corresponding Z-buffer value will
be hidden behind some feature which has already been plotted.