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Muster
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pttman
Muster
屬於你的大爆卦
pttman
Muster
屬於你的大爆卦
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Vector maths
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https://math.stackexchange.com/questions/13261/how-to-get-a-reflection-vector
linear algebra - How to get a reflection vector?
r=d−2(d⋅n)n. where d⋅n is the dot product, and n must be normalized.
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