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27 bytes removed ,  18:33, 28 March 2007
→‎PM1 Quadtree: added pic directly
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== PM1 Quadtree ==
 
== PM1 Quadtree ==
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[[Image:Pm1_example.png|PM1 Quadtree example]]
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A PM1 Quadtree follows the following rules:
 
A PM1 Quadtree follows the following rules:
 
# At most, one vertex can lie in a region represented by a quadtree leaf node.
 
# At most, one vertex can lie in a region represented by a quadtree leaf node.
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# If a quadtree leaf node's region contains no vertices, then it can contain, at most, one q-edge.
 
# If a quadtree leaf node's region contains no vertices, then it can contain, at most, one q-edge.
 
# Each region's quadtree leaf node is maximal.
 
# Each region's quadtree leaf node is maximal.
  −
[http://wam.umd.edu/~bzoller/cmsc420/pm1_example.png Here] is an example.
      
== PM2 Quadtree ==
 
== PM2 Quadtree ==
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