John Carmack developed Doom's engine during a 28-hour coding marathon

John Carmack, lead programmer of Doom, completed the game's groundbreaking graphics engine during a 28-hour coding marathon. This effort not only finished the game but revolutionized the gaming industry. Doom, released in 1993, introduced fast, immersive 3D graphics and pioneered the first-person shooter genre. Carmack's innovations, including Binary Space Partitioning, dynamic lighting, and advanced level architecture, transformed game development. His work later influenced aerospace engineering through his startup, Armadillo Aerospace, which developed suborbital spacecraft for space tourism.