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Issue No.06 - November/December (1990 vol.10)
pp: 44-55
ABSTRACT
<p>Incorporating polarization parameters into the lighting model can enhance the physical realism of images rendered with a ray tracer. Polarization effects can be important in certain scenes, and the difference in rendering even simple scenes with and without proper treatment of polarization can be striking. All light waves possess a state of polarization, which changes almost every time light reflects off a material surface. A single reflection partially polarizes and may even completely polarize previously unpolarized light. Polarization influences the rendering of a scene because the reflected radiant intensity depends largely on the incident light waves's polarization state. E. Wolf's (1959) coherence matrix formalism of polarization has been incorporated into the Torrance-Sparrow reflectance model. This combination allows elegant quantitative derivations of the altered polarization state of light upon reflection in a ray tracer. Comparisons of identical scenes rendered with a conventional ray tracer and the ray tracer presented incorporating a polarization model show that the present method renders specular interobject reflections more accurately with respect to reflected radiance and color.</p>
CITATION
Lawrence B. Wolff, "Ray Tracing with Polarization Parameters", IEEE Computer Graphics and Applications, vol.10, no. 6, pp. 44-55, November/December 1990, doi:10.1109/38.62695
REFERENCES
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9. R. Siegel and J.R. Howell,Thermal Radiation Heat Transfer, McGraw-Hill, New York, 1981.
10. T. Whitted, "An Improved Illumination Model for Shaded Display,"Comm. ACM, Vol. 23, No. 6, June 1980, pp. 343- 349.
11. A.S. Glassner, ed.,An introduction to Ray Tracing, Academic Press, London, 1989.
12. G.W. Meyer and D.P. Greenberg, "Perceptual Color Spaces for Computer Graphics,"Computer Graphics(Proc. Siggraph), Vol. 14, No. 3, July 1980, pp. 254-261.
13. L. B. Wolff, "Polarization methods in computer vision," Ph.D. thesis, Columbia University, Jan. 1991.
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