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M. Wimmer, D Scherzer, W. Purgathofer:
"Light Space Perspective Shadow Maps";
Vortrag: Eurographics Symposium on Rendering 2004, Norrköping, Sweden; 21.06.2004 - 23.06.2004; in: "Proceedings of the Eurographics Symposium on Rendering", A. Keller, H Jensen (Hrg.); ACM, (2004), ISBN: 3-905673-12-6; S. 143 - 151.

In this paper, we present a new shadow mapping technique that improves upon 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
depth 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.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04968536

http://www.cg.tuwien.ac.at/research/publications/2004/Wimmer-2004-LSPM/