Hierarchical Z-Buffer Occlusion Culling

http://www.nickdarnell.com/2010/06/hierarchical-z-buffer-occlusion-culling/
http://www.gamedev.net/blog/1025/entry-2249535-hierarchical-z-buffer-occlusion-culling-updated-07152011/
http://rastergrid.com/blog/2010/10/hierarchical-z-map-based-occlusion-culling/
http://www.nickdarnell.com/2011/06/hierarchical-z-buffer-occlusion-culling-generating-occlusion-volumes/
http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=302406
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