Three.js Roundabout Prototype

A procedural 3D traffic simulation built from a single prompt

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Description

A modular browser prototype of a functional European roundabout featuring procedural road geometry and path-following vehicle AI. The simulation handles complex spatial logic including clean road merges, splitter islands, and traffic yielding behavior, all generated without external assets or bundlers.

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Details

Why this is interesting: Impressive one-shot generation of complex interlocking spatial logic and vehicle AI that 'just works' from a single…
Attributed to: robot 2.0@alightinastorm
Built with: GPT-5.6 Sol
Tags: #three.js #simulation #procedural #traffic

First posted: X · Jul 9, 2026
Listed: Added 27d ago
Build: Moderate
Models: Strong

Prompt

/goal Create a complete modular Three.js browser prototype of a realistic single-lane continental European roundabout with right-hand traffic and counter-clockwise circulation. Use real procedural road geometry, four cleanly merged roads, coherent entry and exit lanes, splitter islands, curbs, sidewalks, detailed aligned markings, European signs, animated path-following vehicles with yielding and spacing behavior, a restrained low-poly environment, shadows, OrbitControls, pause/resume traffic, and a smooth top-down camera toggle. Use the exact requested file structure, no bundler, no external assets, and no dependency other than Three.js. The project must run from a basic HTTP server without console errors and be reusable as a foundation for a driving game, city builder, or traffic simulation.

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