Introduction
3D computer graphics tend to be realistic and explicit. The creation of photo-realistic images by computer has been a long term goal of film industry and academia in computer graphic research (Safarian 2003), and arguably, the goal has nearly been achieved except for certain minor areas such as the realistic human face with expressions. Even this last challenge has possibly been solved as images showed in the recent live-action productions, such as The Curious Case of Benjamin Button (Fincher 2008) and Avatar (Cameron 2009).
However, if the purpose of computer graphic is for visual communication or storytelling, 2D graphical style is an alternative approach to create digital art or produce computer animations. The 2D graphical approach can benefit the animation production both aesthetically and economically.

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