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Coherent stylized silhouettes
Author(s): Robert D. Kalnins, Philip L. Davidson, Lee Markosian, Adam Finkelstein.
Article: ACM Transactions on Graphics, Vol. 22, No. 3, pp. 856--861, July,
2003.
[BibTeX] 
Abstract:
We describe a way to render stylized silhouettes of animated 3D models with temporal coherence. Coherence is one of the central challenges for non-photorealistic rendering. It is especially difficult for silhouettes, because they may not have obvious correspondences between frames. We demonstrate various coherence effects for stylized silhouettes with a robust working system. Our method runs in real-time for models of moderate complexity, making it suitable for both interactive applications and offline animation.
WYSIWYG NPR: Drawing Strokes Directly on 3D Models
Robert D. Kalnins, Lee Markosian, Barbara J. Meier, Michael A. Kowalski, Joseph C. Lee, Philip L. Davidson, Matthew Webb, John F. Hughes, Adam Finkelstein.
ACM Transactions on Graphics, Vol. 21, No. 3, pp. 755--762, July,
2002. [BibTeX]
WYSIWYG NPR: Interactive Stylization for Stroke-Based Rendering of 3D Animation
Robert D. Kalnins.
Princeton University, June,
2004. [BibTeX]