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Efficient calculations in optical engineering are rarely accomplished through brute force raytracing. Using techniques derived from radiometry, it is possible to perform stray light, illumination uniformity, and thermal self-emission calculations both efficiently and accurately in a small fraction of the time it would take to trace the requisite number of rays.
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Richard N. Pfisterer, "Clever tricks in optical engineering," Proc. SPIE 5524, Novel Optical Systems Design and Optimization VII, (22 October 2004); https://doi.org/10.1117/12.566399