Accelerated Walkthroughs Of Virtual Environments Based On Visibility Preprocessing And Simplification
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A Survey of Advanced Interactive 3-D Graphics Techniques
Another class of visibility algorithms deals with the reduced problem of 2 ½ D visibility, that is representative for all environments where the user s movement is constrained to a plane (such as walking on a single floor of a building). Yagel and Ray [Yage96] present a visibility algorithm for cells based on a regular grid subdivision in 2-D.