Procedural planet spins with city lights on its night side

i asked opus 5.5 to build me a planet.

not a picture of a planet. a whole planet.

it wrote a single html file. no libraries, no images, no 3d models. every ocean, every mountain and every city light is math, generated live in your browser.

then i started playing with it.

drag it and it spins. raise the sea level and watch continents drown. move the sun and watch the cities switch on at night.

hit "new planet" and it invents a new world. it even names it.

a year ago this was a semester project for a graphics student.

now it's a prompt.

Make one like this

1. 1 · Copy the prompt

   Use the prompt above as your starting point, then change the subject and the style.

2. 2 · Direct it like an editor

   Ask for one self-contained HTML file on a fixed 1920×1080 stage, link this video as the reference, and send two or three rounds of specific notes.

3. 3 · Render it to MP4

   Screen-record a short piece, or capture it frame by frame for exact timing. How →