Illumination and Shading
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Calculating Refraction Vector

T = sin [theta]rM - cos[theta]rN
= sin[theta]r / sin[theta]i (N cos[theta]i - L) - cos[theta]r N
=( (ni / nr) (N cos[theta]i - L) - cos[theta]r N
= ((ni / nr) cos[theta]i - cos[theta]r) N - (ni / nr) L
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