Building a playable GTA-style 3D browser slice with six GPT-6 Astra prompts
Over three hours and six prompts, the author locked the spec and art direction to build a drivable 3D browser demo, sharing each prompt verbatim.
how to build GTA 6 with any AI agent? i did it for 3 hours, below each step for GPT 6 Astra. > lock the spec (TZ-gta-slice.md) prompt: "Build a playable 3D browser slice. Do not change this spec once it is locked. District and clip first. Controls after." > the stack (Vite, vanilla TypeScript, Three.js, cannon-es, Web Audio) prompt: "Stack is fixed. Vite. vanilla TypeScript. Three.js. cannon-es. Web Audio. One browser URL." > the frame (sunset over the water, wet asphalt, palms) prompt: "One shore district. Sunset over the water. Wet asphalt. Palms. Hold the frame on light and camera, not poly count. No default gray light. No naked cubes." > the three (one scene, one car, about 20 seconds) prompt: "Keep the three in one scene. They talk. Then they sit in one car. About 20 seconds. Quality over extra switches." > the cut (15 to 20 seconds, keep it smooth) prompt: "If it lags, cut the clip to 15 to 20 seconds. Keep it smooth. If the frame drops, cut pedestrians, not the light." > the sound (human voices, pad under the lines, car rumble) prompt: "Voices must sound human, not robot. Quiet pad under the lines, never over them. When they sit, low car rumble, not a saw. No radio hiss." six prompts. the world runs. I drive it. btw I keep building it, it’s only my 2nd day so stay tuned
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