[vtkusers] Anything removed in the new edition of the book "The Visualization Toolkit An Object-Oriented Approach To 3D Graphics"

[Xiaoping Zheng]

Hi,
The 2nd edition of this book has more than 600 pages, but the new book
is much thiner. Since new content must have been added into the new
edition,
why did it become smaller?
 
Would you tell me which edition I should buy and why?
Or can I get every thing in the book from the examples, tutorials in Internet?
 
Thank you very much.