Incremental update of the visibility map as seen by a moving viewpoint in two dimensions
Sherif Ghali
and A. James Stewart
Proc. 7th Int. Worksh. Computer Animation and Simulation, Eurographics Book Series, Eur. Assoc. for Computer Graphics, Aug 1996, pp. 1–11
ftp://dgp.toronto.edu/pub/ghali/EWCAS96.ps.gz
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