Real Time Loose and Sketchy Rendering in Hardware
Author(s): Son Ni Ho, Ryoichi Komiya.
Proceedings: Proceedings of the 20th Spring Conference on Computer Graphics, pp. 83--88, Budmerice, Slovakia,
2004.
[BibTeX] 
Abstract:
Lines are usually drawn to mark the silhouette which
distinct an object from another. From a simple stroke by
the artist’s hand, lines can be as expressive as though the
drawn object is alive. Compared to the actual realistic
rendering of the model, simple sketches of lines not only
catches our attention faster, but also allows the young
mind to understand easier. This paper presents a realtime
rendering algorithm in a loose and sketchy style.
The basis of this was presented by Curtis [1998] but is
used for offline rendering. Lines are drawn using a
stochastic particle system to convey emotions and
personality at every stroke. At runtime, the particles are
generated from the template image, guided by the force
field with some controllable variable to produce a lively
stroke using programmable shaders.