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atmosphere

A free web demo — play it in your browser, no install. A WebGL renderer that reproduces the sky from time and weather: one WebGL1 fragment shader, no dependencies, no DOM or framework coupling.

by @takustaqu · takustaqu/atmosphere on GitHubLANG TypeScript★ 5HOSTED ON TAKUSTAQU.GITHUB.IOUPDATED 11 Oct 2026

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From the README

Pass in a time and a weather, and it roughly reproduces that sky. One WebGL fragment shader, no dependencies, no DOM or framework dependency. See the samples in examples/ to see it in action.

This keeps drawing Tokyo's sky at that day and hour, with 95% cloud cover, 12mm/h of rain and 18m/s of wind. Calling sky.set({ ... }) transitions smoothly to a new weather over a few seconds.

It started as a side feature added while personally porting a certain game. It isn't a physical weather simulation, so it isn't accurate — but it should be an easy way to get a sky that keeps changing procedurally.

Read the full README on GitHub →

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