A magic book that dissolves into particles

大话ocean asked Codex to drive Three.js. The assignment was a magic book dissolving into particles. The path in the post runs from prompt debugging to a GPGPU particle system plus light. The author barely typed the code.

A dissolve is a good stress test for an AI-written shader. Particles have to be born on the pages, drift with some memory of the book's shape, and stay clear of turning into white fog. GPGPU means that motion is computed on the graphics card. That is the difference between a sprinkle of sprites and a cloud that feels like matter.

The ending invitation — a tutorial, if people ask — fits. It is a technique someone else might want.