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Geometry of the Hitbox: The Mathematical Evolution of Collision Detection in Classic 2D Fighting Games

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When a player executes a perfectly timed, pixel-perfect punch in a classic arcade fighting game, the visual spectacle is just an illusion. Beneath the beautifully drawn character sprites lies an invisible, rigid world of overlapping rectangles doing the actual work.

Early game consoles and arcade boards lacked the processing power to calculate complex, real-world physics or track collisions pixel by pixel. If developers had tried to make the games mathematically realistic, the hardware would...