to make object face at camera(billboarding)
http://nehe.gamedev.net/article/billboarding_how_to/18011/
http://www.lighthouse3d.com/opengl/billboarding/index.php?billInt
http://nehe.gamedev.net/article/billboarding_how_to/18011/
http://www.lighthouse3d.com/opengl/billboarding/index.php?billInt
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