Instruct: Classify an Amazon review into positive or negative sentiment.
Query: This book is bad

If you want to know everything about photon mapping this is not the book to buy. The book is full of weak points and lacks many details and, I'm sad to say, the author at some points confuses more than he does anything else. Furthermore the book only goes half the way - there is so much more to the photon map technique.The true target group for this book is difficult to specify. If you don't know anything about computer graphics it is probably good in some ways if you can detects the errors - very unlikely. If you are an experienced games programmer, this is too introductionary.