Scene Graph and Hierachical Clustering Structure

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http://www.gamedev.net/community/forums/topic.asp?topic_id=128965
http://www.gamedev.net/community/forums/topic.asp?topic_id=110342
http://www.gamedev.net/community/forums/topic.asp?topic_id=181233
http://www.gamedev.net/community/forums/topic.asp?topic_id=540401

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