Seonglae Cho is reflectivity and is reflect color and is object color
Reflection computing methods
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https://www.cs.ucr.edu/~craigs/courses/2022-fall-cs-130/lectures/lighting-shading.pdf
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https://www.cs.ucr.edu/~craigs/courses/2022-fall-cs-130/lectures/raytracing-shadow-reflect-transmit.pdf