Firn
a hyperspectral snow lab hero where a grainy mountain flight breaks into planes
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What's inside
- Prompts
- HTML · 748 lines / React · 876 lines
- Media
- WebGL scene · Canvas
- Hosting
- cdn.orbital.supply, already in the prompt
- Fonts
- Albert Sans + Big Shoulders Stencil Display + Fragment Mono · Google Fonts
- HTML
- One file, no libraries
- React
- React 19.3.0 · Tailwind 4.3.3 · Vite 8.3.2 · TypeScript 6.0.3
- Motion
- loader, spectrum-loader, plane-slip, pointer-trail
Tested & documented
09 October 2026
- Reproduced in Claude
- Rebuilt blind from the prompt: React and HTML
- Checked at 375, 768, 1440, 1920 px
- Spec linter: 0 errors, no generator links
How to use it
Claude
Paste the HTML prompt into a new chat. You get one index.html to serve over HTTP or publish anywhere.
Vite + React
Open an empty Vite + React project and paste the React prompt. It lists the exact packages; the asset URLs are already inside.
The prompt
Excerpt / 876 lines in the full prompt
# Build: "FIRN — a hero for a hyperspectral snow lab" — a grainy flight through the mountains that breaks into planes under the pointer
## 0. Brief
Firn (fictional) flies a hyperspectral camera over the world's high ranges and measures snow grain, water and melt. The hero is one full screen: a real-time flight down a mountain valley toward an iridescent halo, drawn as grains of light on warm graphite; only lit areas turn to grain, the darks stay clean. The pointer leaves a trail where the picture breaks into vertical planes that slip up or down, magnify slightly like fluted glass and settle back on springs. A loader draws the reflectance spectrum of snow band by band (240 bands, 400–2500 nm); then the planes land from the centre outward while the grain fills in, and the page assembles in order. The layout mixes editorial and technical: a huge stacked wordmark FIRN down the right edge (cut by the same planes), small uppercase meta, a light uppercase headline, an instrument readout under the pointer and a countdown to the next pass. Every label breaks into three slipping slices on hover, like the planes behind it.The full prompt unlocks at launch.