Selective Culling of Discontinuity Lines
In recent years discontinuity meshing has become an important part of mesh-based solutions to the global illumination problem. Application of this technique accurately locates all radiance function discontinuities in the scene and is essential for limiting visual artifacts. In an environment containing m edges there are O(m 2) D 1 and D 2 discontinuities. With a typical scene this can result in many thousands of discontinuity lines being processed. We review existing methods for reducing these lines and introduce an improved, perception based metric for determining which discontinuities are important and which can be safely ignored. Our results show that a 50% or more reduction in the number of discontinuity lines can be achieved with a corresponding reduction in general mesh complexity, with little or no perceptible change to the rendered result.
KeywordsDiscontinuity Line Adaptive Mesh Refinement Global Illumination Visual Artifact Radiance Function
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- 5.George Drettakis. Simplifying the Representation of Radiance from Multiple Emitters. Fifth Eurographics Workshop on Rendering, pages 259–272, June 1994.Google Scholar
- 6.D. Farnsworth. A temporal factor in colour discrimination. In Visual Problems in Color, II (National Phys. Lab. Symposium), number 8, page 429. Her Majesty’s Stationery Office, London, 1958.Google Scholar
- 7.S. Gibson and R.J. Hubbold. Perceptually-driven radiosity. Computer Graphics Forum,to appear.Google Scholar
- 8.Stephen Hardt and Seth Teller. High-Fidelity Radiosity Rendering at Interactive Rates. Rendering Techniques ‘86 (Proceedings of the Seventh Eurographics Workshop on Rendering), pages 71–80, 1996.Google Scholar
- 9.Paul Heckbert. Simulating Global Illumination Using Adaptive Meshing. Ph.D. thesis, Technical Report, June 1991.Google Scholar
- 10.Paul Heckbert. Discontinuity Meshing for Radiosity. Third Eurographics Workshop on Rendering, pages 203–226, May 1992.Google Scholar
- 14.Mark C. Reichert. A Two-Pass Radiosity Method Driven by Lights and Viewer Position. M.Sc. thesis, Program of Computer Graphics, Cornell University, Ithaca, NY, January 1992.Google Scholar
- 15.W. Sturzlinger. Adaptive Mesh Refinement with Discontinuities for the Radiosity Method. Fifth Eurographics Workshop on Rendering, pages 239–248, June 1994.Google Scholar
- 16.Filippo Tampieri. Discontinuity Meshing for Radiosity Image Synthesis. Ph.D. thesis, Technical Report, Ithaca, NY, 1993.Google Scholar
- 20.Gregory J. Ward. A Contrast-Based Scalefactor for Luminance Display. In Paul S. Heckbert, editor, Graphics Gems IV, pages 415–421. Academic Press Professional, Boston, MA, 1994.Google Scholar
- 21.Adam Worrall, Claire Willis, and Derek Paddon. Dynamic Discontinuities for Radiosity. Edugraphics + Compugraphics Proceedings, pages 367–375, December 12 1995.Google Scholar