Almost all of the material in this book is a slightly more verbose explanation of what can be found in the docs. If used as a reference this is fine, but for someone who is trying to learn Java 3D it would probably be more useful to get a book that goes through examples and explains more clearly from the ground up. While it was not written badly, this book does not explain the concepts as clearly as they could have been. All of the examples I looked at come with the Java 3D distribution. Personally I would just download all the documentation and the Java 3D tutorial and not spend the $50.