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Opus 5.5 · 3D scenes

Realistic fire in pure JavaScript

Three.js · GLSL · Web Audio

HD recreation

HD recreation

Original by @NathanWilbanks_

View original post on X ↗

A GPU fluid simulation with flame colours from blackbody physics and sound to match.

Original prompt

I asked opus 5.5 in @agnt_gg for the most realistic fire it could build using ONLY javascript.
It wrote a real 3D fluid simulation that runs on the GPU. The flame colors come from blackbody physics, the smoke is real volume, it runs at 96 fps in 1080p, and it critiqued its own renders about 40 times.
Then it shot a 38 second film of it. The sound comes from the fire itself. 🔥
Details:
- Nothing faked. The fire is actual simulated gas that burns, heats up, rises, and swirls. It gives off soot that glows, and the soot that escapes cools into smoke. Every frame is computed on the GPU.
- The AI graded its own work: render a frame, have a vision model pick it apart like a VFX supervisor, fix it, repeat. It caught a flame that kept dying, ring shaped artifacts on the ground, and coals that looked like cheese chips.
- The film isn't screen recorded. Each frame is rendered offline with scripted camera moves. The crackle and roar come from how brightly the fire burns in each frame.
- No Blender, no stock footage, no sound library. One HTML file, one conversation.
Excerpt — full prompt in the original post

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