First, I can not hide the fact that the authorput a valuable effort in this book, it is a goodbook but still I have some criticism. like everybook when it deals with straight forward things,it gives u full details but when it comes to realstuff starts summarizing stuff. I can understandthis since the book talks about so many topicshowever the main disadvantage of this book is thatit did not succeed in giving the reader a goodunderstanding on how is the code provided interactswith the engine. I do not know, I can not word it wellbut the key point as u proceed reading the booku feel like it is easy going but when u reach thereal meat you start feeling that the writer started torush. I have no problem with just summaries but what isimportant is the context, when u talk about the engineand scripts, u need to explain what the hell are theseclasses and call back functions that are just copiedto this book.