Light Space Perspective Shadow Maps

  • Wimmer M
  • Scherzer D
  • Purgathofer W
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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.

Author-supplied keywords

  • real-time rendering
  • shadows

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  • Michael Wimmer

  • Daniel Scherzer

  • Werner Purgathofer

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