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→PM2 Quadtree: added pic directly
== PM2 Quadtree ==
== PM2 Quadtree ==
[[Image:Pm2_example.png|PM2 Quadtree example]]
A PM2 Quadtree follows the following rules:
A PM2 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.
# If a quadtree leaf node's region contains no vertices, then it can contain only q-edges that meet at a common vertex exterior to the region.
# If a quadtree leaf node's region contains no vertices, then it can contain only q-edges that meet at a common vertex exterior to the region.
# Each region's quadtree leaf node is maximal.
# Each region's quadtree leaf node is maximal.
== PM3 Quadtree ==
== PM3 Quadtree ==