Light Space Perspective Shadow Maps

Paper

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• Publication Type: Conference Paper
• Date (from): 21.6.2004
• Date (to): 23.6.2004
• Editor: Alexander Keller and Henrik W. Jensen
• ISBN: 3-905673-12-6
• Lecturer: Michael Wimmer
• Location: Norrköping, Sweden
• Organization: Eurographics
• Publisher: Eurographics Association
• Keywords: shadows, real-time rendering

@inproceedings\{Wimmer-2004-LSPM,
  title =      "Light Space Perspective Shadow Maps",
  author =     "Michael Wimmer and Daniel Scherzer and Werner Purgathofer",
  year =       "2004",
  abstract =   "In this paper, we present a new shadow mapping technique
               that improves the quality of perspective and uniform shadow
               maps. Our technique uses a perspective transform specified
               in light space which allows treating all lights as
               directional lights and does not change the direction of the
               light sources. This gives all the benefits of the
               perspective mapping but avoids the problems inherent in
               perspective shadow mapping like singularities in
               post-perspective space, missed shadow casters etc.
               Furthermore, we show that both uniform and perspective
               shadow maps distribute the perspective aliasing error that
               occurs in shadow mapping unequally over the available
               z-range. We therefore propose a transform that equalizes
               this error and gives equally pleasing results for near and
               far viewing distances. Our method is simple to implement,
               requires no scene analysis and is therefore as fast as
               uniform shadow mapping.",
  pages =      "143--151",
  month =      jun,
  organization = "Eurographics",
  booktitle =  "Rendering  Techniques 2004 (Proceedings Eurographics
               Symposium on Rendering)",
  editor =     "Alexander Keller and Henrik W. Jensen",
  isbn =       "3-905673-12-6",
  publisher =  "Eurographics Association",
  location =   "Norrk{\"o}ping, Sweden",
  keywords =   "shadows, real-time rendering",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/2004/Wimmer-2004-LSPM/",
}