Sketchy drawings: a hardware-accelerated approach for real-time non-photorealistic rendering
Author(s): Marc Nienhaus, Jürgen Döllner.
Proceedings: SIGGRAPH 2003 conference on Sketches & applications,
2003.
[BibTeX] 
Abstract:
In Non-Photorealistic Rendering (NPR), sketchy drawings are
essential to visually communicate and illustrate drafts and ideas,
for instance, in architectural or product design. However, current
hardware-accelerated, real-time rendering techniques do not
concentrate on sketchy drawings of arbitrary 3D scene
geometries.
We present an image-space rendering technique that uses today’s
texture mapping and fragment shading hardware to generate
sketchy drawings of arbitrary 3D scene geometry in real-time.
We stress sketchiness in our drawings by simulating uncertainty.
For simulating uncertainty we have to adjust visibility
information using depth sprites, which allow us depth testing and
3D scene composition.