I Vibe-Coded 3D FPS Game from Scratch in 1 Hour (No Unity!)

How I vibe coded a complete, 3D First Person Shooter running at 144 FPS directly in the web browser! I had ZERO game dev experience prior to this, and I used 100% FREE tools to make it happen. Instead of a traditional game engine, we are using Three.js and AI coding agents (Google Antigravity, Gemini 3.1 Pro, and Claude Opus 4.6) to write the entire game from scratch. I’ll walk you through my exact AI prompts, my workflow for finding free 3D models and HDRI maps, and how we solved complex performance issues. Follow me on X: https://x.com/redStapler_twit Play the Demo here: https://theredstapler.github.io/orb-shooter/ Source Code & Attribution: https://github.com/theredstapler/orb-shooter/tree/main *** My Portable AI PC Setup *** CPU: https://amzn.to/3Lx52Vv GPU: https://amzn.to/3YWMPDS RAM: https://amzn.to/49l7vdD Board: https://amzn.to/4poMEfp PSU: https://amzn.to/4po6xU0 ⏱️ Chapters: 0:00 - Intro 0:47 - Game Engine 1:40 - AI Agent & Game Assets 2:43 - The Prompt 3:28 - First Playtest 4:06 - Adding Enemies and Boss 4:48 - Adding Shaders 5:26 - Performance Issues 6:09 - Sound Effects & AI Music 6:56 - Polishing 7:15 - Final Result #vibecoding #threejs #aicoding #fpsgames #gamedev