From empty UE5.9 map to a 4,000-building island city, built live with AI in one day
chrisfirst · x · 2026-11-13
Day 1 of the Epic AI MegaJam: chrisfirst built an entire game world live with AI. The stream started with an empty map in Unreal Engine 5.9 and ended with an island city of nearly 4,000 buildings and a beat-up yellow car called the Rat driving through it.
The thread documents the full workflow: AI-generated car concept art → UE's built-in AI assistant building the city from gray boxes and saving the layout → swapping in the City Sample pack and Fab props (4,000 buildings, 28,000 props) → AI-written director lines voiced by ElevenLabs. The theme is Director's Cut: you play a stunt driver on a movie set, and every mission is a take.
Related event: chrisfirst Live-Builds an Island City of ~4000 Buildings with AI in UE5.9(6 posts)→
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