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"Moving Frostbite to PBR" SIGGRAPH 2014 http://www.frostbite.com/wp-content/uploads/2014/11/course_notes_moving_frostbite_to_pbr.pdf "Real Shading in Unreal Engine 4" SIGGRAPH 2013 p12 : http://blog.selfshadow.com/publications/s2013-shadin…