Hi I''m wondering if it''s worth buying this book. Has anyone else bought it and can recommend it to me? The thing is I also have the OpenGL SuperBible (Second Edition) which is a couple of years older than this book. Is it still worth getting the OpenGL Reference Manual even though I''ve almost finished reading the SuperBible? Will the Reference Manual teach me anything new that the SuperBible doesn''t? I was a bit dissapointed that the SuperBible didn''t go into anything like quaternions, BSP trees and gimble lock. Does the OpenGL Refernece Manual touch on any of these subjects? Thanks.