Fine Tone Control in Hardware Hatching
Author(s): Matthew Webb, Emil Praun, Adam Finkelstein, Hugues Hoppe.
Proceedings: 2nd International Symposium on Non-Photorealistic Animation and Rendering (NPAR'02), Annecy, France, June 3-5,
2002.
[BibTeX] 
Abstract:
Recent advances in NPR have enabled real-time rendering of 3D
models shaded with hatching strokes for use in interactive
applications. The key challenges in real-time hatching are to
convey tone by dynamically adjusting stroke density, while
controlling stroke size and maintaining frame-to-frame coherence.
In this paper, we introduce two new real-time hatching schemes
that leverage recent advances in texture mapping hardware. Both
schemes provide enhanced control of tone, thereby avoiding
blending or aliasing artifacts present in previous systems. The
first scheme, which relies on volume rendering hardware, admits
the use of color. The second scheme, which uses pixel shaders,
allows per-pixel lighting operations such as texture modulation.
Both schemes run at interactive rates on inexpensive PC graphics
cards.