Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great book from an experienced programmer.

The book is exactly how the title describes it. It is developing a 3d terrain engine and if that is what you are looking to do then this is well worth the 30 bucks, in my opinion. The author is an experienced programmer and it shows through the code. The design of the engine is elegant and if you learn nothing else from the book you will at least walk away with a better understanding of engine design.The book not only shows you the theory behind terrain programming but also resource management, scene management and integrating pixel and vertex shaders. This book seems to always be laying around open on my desk.