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The Vector3D class debuted in Flash Player 10.0 as Adobe’s official implementation of, well, a 3D mathematical vector (not the pseudo-Array class Vector). Weirdly, it has a w component and is therefore technically a 4D vector, but its API inconsistently make use of the fourth dimension. There are also strange oversights, inefficiencies, and functionality it really should have always had. Read on for my custom Vector3D derivative—Vector3DExt—that fixes all of these problems by extending and improving on the original.

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