Automatic Non-photorealistic Technical Illustration
Goal and Approach
Phong-shaded 3D imagery does not provide geometric information of the
same richness as human-drawn technical illustrations. A
non-photorealistic lighting model is presented that attempts to narrow
this gap. The model is based on practice in traditional technical
illustration, where the lighting model uses both luminance and changes
in hue to indicate surface orientation, reserving extreme lights and
darks for edge lines and highlights. The lighting model allows shading
to occur only in mid-tones so that edge lines and highlights remain
visually prominent. In addition, we show how this lighting model is
modified when portraying models of metal objects. These illustration
methods give a clearer picture of shape, structure, and material
composition than traditional computer graphics methods.
Participants
Publications
- Gooch, A., Gooch, B., Shirley, P., and Cohen, E., "A Non-photorealistic Lighting
Model for Automatic Technical Illustration", in Computer Graphics, July
1998. ACM Siggraph '98 Conference Proceedings.
[PS]
[HTML]
- Bruce Gooch, Peter-Pike J. Sloan, Amy Gooch, Peter Shirley,
Richard Riesenfeld. "Interactive Techincal Illustration", ACM
Interactive 3D, April 1999. [HTML] [pdf] [postscript]
- Stuart Green, David Salesin, Simon Schofield, Aaron Hertzmann, Peter
Litwinowicz, Amy Gooch, Cassidy Curtis, Bruce Gooch. "Non-Photorealistic
Rendering," SIGGRAPH 99 Course Notes, 1999.
Support
Support for this research was provided by NSF Grant
MIP-9420352, by DARPA grant F33615-96-C-5621, and by the NSF and DARPA
Science and Technology Center for Computer Graphics and Scientific
Visualization (ASC-89-20219).
gdc-web@cs.utah.edu
Last update: January 7, 2000
