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A-buffer
In computer graphics, A-buffer, also known as anti-aliased, area-averaged or accumulation buffer, is a general hidden surface mechanism suited to medium scale virtual memory computers. It resolves visibility among an arbitrary collection of opaque, transparent, and intersecting objects. Using an easy to compute Fourier window (box filter), it increases the effective image resolution many times over the Z-buffer, with a moderate increase in cost.
The A-buffer method is a descendant of the well known Z-buffer, which provides good quality results in moderate time.
== Uses ==
In 3-D image synthesis system, the balance between the quality and the cost of computation has always been needed. Using a full object-precision visible-surface algorithm at each pixel is expensive. A-buffer method provides moderate quality results in moderate cost of computation.
A-buffer help in using visibility techniques and support all conceivable geometric modeling primitives: polygons, patches, quadrics, fractals, and so forth. It also help to handle transparency and intersecting surfaces (and transparent intersecting surfaces).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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