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PVS Tutorial + demo 
3D engines
This tutorial describes the method I have developed to calculate the Potentially Visible Set (PVS) of leaves of a BSP tree in real-time. Unlike other methods that pre-calculate the PVS as part of the world data, this method uses the view frustum and the current leaf node's portals to find which leaves are potentially in view.
Author Alan Baylis  Last update 2003-02-11  English
 

Link

http://members.net-tech.com.au/alaneb/pvs_tutorial.html

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