Non-photorealistic Rendering: Unleashing the Artist's Imagination [Graphically Speaking]
Amit Agrawal · IEEE Computer Graphics and Applications · 2009
If history is any indication, non-photorealistic rendering (NPR) is an important future direction for computer graphics. There are creative and business reasons for doing NPR in animation, but coherence continues to be an important problem. Even though important work has been done in the area, much work remains.