GitHub - deedy/glacial-valley: A photorealistic glacial valley at sunrise, procedurally generated in real time in the browser. Three.js, zero assets, all math. · GitHub
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deedy
glacial-valley
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demo-video
demo-video
.gitignore
.gitignore
README.md
README.md
index.html
index.html
main.js
main.js
preview.png
preview.png
serve.py
serve.py
shaders.js
shaders.js
tree-test.html
tree-test.html
trees.js
trees.js
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Glacial Valley
A photorealistic alpine glacial valley at sunrise, running in real time in the browser.<br>No game engine. No textures. No 3D models. Every mountain, the braided river, the<br>grass, the birds — all generated procedurally from math, in ~2,400 lines of Three.js.
▶ Walk around in it — mouse looks<br>(hold the cursor at a screen edge to keep turning), WASD moves, Shift sprints,<br>Space jumps. You can wade into the river.
How it works
Terrain — erosion-weighted fBm (octaves damped by accumulated gradient) plus<br>ridged multifractal peaks with domain warping. One height function drives the mesh,<br>the physics, the water depth, and all object placement. The braided river emerges<br>naturally: a wide shallow trough whose gravel-bar noise crosses the waterline.
Light & shadow — the sun is static, so sun visibility is ray-marched over the<br>heightfield and baked at load: mountains cast kilometer-long soft shadows, shaded<br>areas stay cold blue, and the drifting mist respects fog shadows behind boulders.
Water — two-pass screen-space refraction, Beer–Lambert absorption plus glacial<br>rock-flour scattering (that's the turquoise), depth-faded caustics, bed-gradient<br>rapids whitewater, shoreline foam, sun glitter.
Life — 85k wind-bent grass blades with per-blade gust flutter, circling birds,<br>fish-rise rings on calm pools, splash droplets at rapids, insects, pollen drifting<br>in sunbeams, dew, wildflowers.
Pipeline — all materials output linear HDR; a post pass applies ACES tonemapping,<br>vignette, grain, and adaptive exposure that stops down as you turn toward the sun.
Everything is generated at load (~3–5 s): no asset files, no network requests beyond<br>the Three.js CDN module.
Run locally
python3 serve.py # serves on http://localhost:8123 with caching disabled
Any static file server works. WebGL2 required.
Repo map
File<br>What
index.html<br>shell, import map, loading overlay
main.js<br>terrain generation, shadow baking, scene assembly, player controller
shaders.js<br>all GLSL: terrain, water, sky, mist, grass, rocks, ice, birds, post
serve.py<br>no-cache dev server
demo-video/<br>script that produced the demo video (ElevenLabs VO + captions)
Built with Claude Code.
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A photorealistic glacial valley at sunrise, procedurally generated in real time in the browser. Three.js, zero assets, all math.
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JavaScript<br>85.4%
Python<br>8.6%
HTML<br>6.0%
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