Z-buffer
 n.— «Catmull invented texture mapping (the way to make digital surfaces “pour” over objects), the Z-buffer (an algorithm that tracks the virtual distance between pixels and a viewer, now standard in most personal computers and games), and the Catmull-Rom spline (another algorithm that creates curves along multiple points, producing irregular motion that mimics the way living things really move).» —“Welcome to Planet Pixar” by Austin Bunn Wired June, 2004. (source: Double-Tongued Dictionary)

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