Divide by Depth for Instant 3D

Automated excerpt

In essence, if we say \(y\) is up and \(z\) is forward, 3D coordinates \((x, y, z)\) can be projected into 2D coordinates \((x', y')\) by dividing \(x\) and \(y\) by \(z\). Turns out that’s a special form of the perspective projection matrix. We then multiply by the perspective projection matrix, producing clip-space coordinates that are ready for the perspective division.

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