Fast Perspective Z-Buffer with Inverse Depths

Martin Feda, Robert F. Tobler, Laszlo Neumann
Fast Perspective Z-Buffer with Inverse Depths
TR-186-2-94-16, November 1994 [ paper]
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Abstract

This paper presents a way to hold the depth information in Z-buffers, that allows fast incremental computation of Z-buffer depth values. The main idea is to store the inverse depth with each pixel value. The incremental depth computation can then be done with a single addition per pixel in a scanline.

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@techreport{Feda-1994-FPZ,
  title =      "Fast Perspective Z-Buffer with Inverse Depths",
  author =     "Martin Feda and Robert F. Tobler and Laszlo Neumann",
  year =       "1994",
  abstract =   "This paper presents a way to hold the depth information in
               Z-buffers, that allows fast incremental computation of
               Z-buffer depth values. The main idea is to store the inverse
               depth with each pixel value. The incremental depth
               computation can then be done with a single addition per
               pixel                 in a scanline.",
  address =    "Favoritenstrasse 9-11/186, A-1040 Vienna, Austria",
  institution = "Institute of Computer Graphics and Algorithms, Vienna
               University of Technology",
  note =       "human contact: technical-report@cg.tuwien.ac.at",
  month =      nov,
  number =     "TR-186-2-94-16",
  keywords =   "z-buffer, optimization, rendering",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/1994/Feda-1994-FPZ/",
}