Prerequisite : depth-buffer (or Z Buffer) method
A-Buffer method in computer graphics is a general hidden face detection mechanism suited to medium scale virtual memory computers. This method is also known as anti-aliased or area-averaged or accumulation buffer. This method extends the algorithm of depth-buffer (or Z Buffer) method. As the depth buffer method can only be used for opaque object but not for transparent object, the A-buffer method provides advantage in this scenario. Although the A buffer method requires more memory, but different surface colors can be correctly composed using it. Being a descendant of the Z-buffer algorithm, each position in the buffer can reference a linked list of surfaces. The key data structure in the A buffer is the accumulation buffer.