Attached Link: http://www.renderosity.com/tut.ez?Form.ViewPages=195

You should also read using alpha planes in bryce. It explains the basics that flak doesn't cover. for example, You want to apply a white clear atmosphere so your background books don't pick up a double dose of your final atmosphere and come out dark. One thing none of them mention is if you have an object casting a shadow on one of your shelves in the scene you should put it in for the render. Once you make the shelf flat any shadow will fall flat across it. Thats about it.