Mega Texture

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http://en.wikipedia.org/wiki/MegaTexture
http://www.team5150.com/~andrew/carmack/johnc_interview_2006_MegaTexture_QandA.html
http://dev.gameres.com/Program/Visual/3D/id_tech5_clipmap.pdf
http://www.beyond3d.com/content/articles/95/ 
http://lichong.blogbus.com/logs/32906035.html

Sparse Virtual Textures
http://silverspaceship.com/src/svt/

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