I built a procedural desert explorer with Claude Code (Opus 5) and Three.js

I built this as a graphics tech demo, entirely with Claude Code using Opus 5. **What it is**: a browser desert you walk around in third person. The terrain is a procedural dune field on a GPU clipmap — no meshes, no textures, no downloaded assets; every surface is generated in shader code. Sand deforms permanently where you walk and slowly erodes back. There's a hooded robe simulated as GPU cloth, a physically-based sky marched per pixel, and six aimed sand spells (1–5 and right mouse) that dig real craters into the terrain and raise real dunes you can ride. **How Claude was used**: all of it — the TSL shaders, the compute kernels, the physics integration, and the Node tooling that measures it. The workflow that made it work was giving Claude its own instruments: a headless-Chrome harness that boots the app, screenshots it and reports per-subsystem GPU cost, so changes were made against measured numbers. **Try it**: open…