Procedural mountain sheds rain into streams and lakes
155 views·Posted 24 Sept 2026 · 0:30 · 3D Scenes
Our note
A 3D water simulation in TypeScript and Three.js where rain on a procedural mountain carves streams and fills lakes, built from an empty repo in about 21 minutes with one prompt and 23 of 23 tests passing.
The creator’s post
Claude Opus 5.5 on our AI coding benchmark: build a fully autonomous 3D water simulation from an empty repo - procedural mountains, rain, streams, lakes. TypeScript + Three.js, no physics engine. One prompt, zero corrections, ~21 min. 23/23 tests green. https://github.com/AiondaDotCom/ai-sim-benchmark
The prompt
Claude Opus 5.5 on our AI coding benchmark: build a fully autonomous 3D water simulation from an empty repo - procedural mountains, rain, streams, lakes. TypeScript + Three.js, no physics engine. One prompt, zero corrections, ~21 min. 23/23 tests green. https://github.com/AiondaDotCom/ai-sim-benchmark
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1 · Copy the prompt
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2 · Direct it like an editor
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3 · Render it to MP4
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How it was made
The creator didn’t name their tools. Most videos like this are HTML, canvas or SVG animation written by Claude and screen-recorded or rendered to MP4. How that works →
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