"VTK Users guide" - worth it?

[Stephane M.]

Hi

I'm wondering about the VTK users guide.  I have
already the Visualization book, this is maybe a good
book about visualization but absolutely not a complete
VTK users guide.

So...  the official VTK guide is 60$.  It is a little
expensive for 300 pages.  And more, the shipping for
Canada is 35$!!!  Amazon.com charges 6$ for the
shipping of a book!

With thoses high prices, i'll defer my purchase until
someone convince me that it is worth the trouble.

-Is this book a good reference?
-If i want to "hack" a little in VTK (to use some
openGL primitives unavailable via the VTK API), is
there some information about that?

If not... is there any good web based documentation
and examples?

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