isekai gemcraft
A free simulation — play it in your browser, no install. 3D gemstone faceting simulator in a single HTML file - real-time convex polytope clipping, Three.js, EN/中文
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Open the live demo Source on GitHubFrom the README
A 3D gemstone faceting simulator in a single HTML file. Real faceting-machine mechanics — tilt angle × index gear × depth stop — driven by real-time convex polytope clipping in the browser. No build step, no install, no backend.
▶ Play Now — desktop & mobile (portrait), English / 繁體中文 (toggle in-game, bottom-left)
Free-cutting mode (no diagram, zero guardrails, 🔥 hardcore badge included) is there for purists.
The stone is a convex polytope (vertex + face lists). Every cut is one half-space plane clip (clipSolid) — computed exactly, no voxels, no CSG library, no mesh booleans.
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