A Non-Photorealistic Lighting Model For Automatic Technical Illustration SIGGRAPH 1998

Amy Gooch - Bruce Gooch - Peter Shirley - Elaine Cohen

Abstract:

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.

• Introduction
• Related Work
• Illustration Techniques
• Automatic Lighting Model
  • Traditional Shading of Matte Objects
  • Tone-based Shading of Matte Objects
  • Shading of Metal Objects
  • Approximation to new model
• Future Work and Conclusion
• Acknowledgments
• References
• About this document ...

Our Siggraph 1998 Paper Presentation, Given on Friday, July 24th, Orlando, Florida

Download the paper

• pdf (751KB) (requires at least acroread 3.0)
• compressed postscript (3.4MB)
• pdf with 720dpi images (13MB) (requires at least acroread 3.0)

The images and figures from the paper (with captions)

Perception & Illustration Links

• Cassidy Curtis, particularly "Loose and Sketchy Animation"
• Real-Time NPR Research at Brown University
• Illustration(Art) and Perception(Visualization) reading list for a seminar at Standford
• Dan Kersten's Lab
• (Link broken)Chris Christou

Send Questions or Comments to Bruce or Amy Gooch