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https://knowledge.autodesk.com/support/maya-lt/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/MayaLT/files/BoL-Absorption-reflection-and-refraction-of-light-htm.html
https://abnercabuang.wordpress.com/2017/11/19/reflection-refraction-transmission-and-absorption-of-light/