Stylized Highlights for Cartoon Rendering and Animation
Author(s): Ken Anjyo, Katsuaki Hiramitsu.
Article: IEEE Computer Graphics and Applications, pp. 54-61,
2003.
[BibTeX] 
Abstract:
In traditional cel animation, lights and shadows
are symbolic in that they imply an artistic
interpretation of the characters and scene. For
example, lighting plays an important role in suggesting
a scene’s mood, while a character’s shadow shows
where the character is standing. Highlighting also
describes various aspects of the characters and objects
in the scene.
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