Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Why this book is used for an Intro Class is beyond me.

Dont buy this book if you are wanting to lern how to program openGL. Buy it if you know openGL and want to learn how it works.It is not a book for the openGL newbie. So why many teachers use it for an intro to Graphics Programing class boggles the mind. Angel explantions of theories are hard to follow at best. In one chapter he spends an whole large section explaning the theory behind a lighting model then states that openGL doesn't use this method for lighting. So why even cover it in an openGL book?? This is less a book about openGL and more about 3D modeling and lighting theory in general.