My current project has work title Cartoon [http://wolf-dieter-busch.de/html/Software/Cartoon.htm]. 
Because there are thousands of objecs (literally), 
I am using the oo system [obj] which is designed for speed.

Here my first line test (rotating face):

http://www.youtube.com/watch?v=yXrXDt9wx5k&feature=player_embedded

Work in progress. Project too difficult to publish some source. 
Who is interested, can mail me [mailto:wolf-dieter.busch@gmx.de].

Just in short the basic idea for the rotating face:
The "rotated" curves of the face consist of non-linear morphing curves.
Morphing is split to two aspects: a) contour, b) location.
The contour morphing component is calculated by a cosine function,
the location component is calculated by a sine function.
Perfect. The lines are true 2D data such that a designer is not enforced
to worry about a 3D system.

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