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==Introduction==
Ray tracing is a technique for rendering three-dimensional images with complex light interactions by tracing a path of light through pixels on an image plane. This technique can create graphics of mirrors, transparent surfaces, and shadows with very good results. <ref name=”1”>Rademacher, P. Ray tracing: Graphics for the masses. Retrieved from https://www.cs.unc.edu/~rademach/xroads-RT/RTarticle.html</ref> <ref name=”2”>WhatIs. Ray tracing (raytracing, ray-tracing or ray casting). Retrieved from http://whatis.techtarget.com/definition/ray-tracing-raytracing-ray-tracing-or-ray-casting</ref>
It is necessary to use a renderer that can simulate the light interactions occurring in the scene to achieve a sense of realism. These interactions can be the reflection of light, refraction, absorption, etc., and it is necessary a full knowledge of the scene when processing each individual pixel. A common rendering technique - a real-time rasterised renderer - does not really support such computations. <ref name=”3”>Einig, M. (2017). How ray tracing is bringing disruption to the graphics market – and impacting VR. Retrieved from https://www.virtualreality-news.net/news/2017/mar/17/how-ray-tracing-bringing-disruption-graphics-market-and-impacting-vr/</ref>
