RGBで正規化された3次元ベクトルをよく格納するので、ポリゴンと全く同じ向きを向かせるとだいたい (128, 128, 255) になるhttps://ja.wikipedia.org/wiki/%E6%B3%95%E7%B7%9A%E3%83%9E%E3%83%83%E3%83%94%E3%83%B3%E3%82%B0
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