treegen

Stylized low-poly tree generator. Deterministic — the same seed always produces the same tree — and game-ready: exports GLB or OBJ with sane triangle counts.

Three ways to use it:

It is also hosted as a remote MCP server at https://mcp.andreglegg.no/treegen, so no install is needed:

claude mcp add --transport http treegen https://mcp.andreglegg.no/treegen

Library use

The generator is DOM-free and runs in Node or the browser. Only three is a runtime dependency — everything else here is dev-only.

npm install github:andreglegg/treegen

import { buildTree, meshStats, presets } from 'treegen/generator';
import { exportGlb } from 'treegen/export';

const tree = buildTree({ ...presets.oak, seed: 42, detail: 1 });
console.log(meshStats(tree));        // { meshes, triangles }
const glb = await exportGlb(tree);   // ArrayBuffer — works in Node and browser

exportGlb shims FileReader when it is missing, so the same code path works in Node and in the browser.

Related MCP server: instant-meshes-mcp

Parameters

Six presets (meadow, orchard, pine, oak, acacia, willow) and five species silhouettes (round, oak, acacia, willow, pine). Everything is bounded — see paramShape in mcp/server.js for ranges.

detail drives the triangle budget, at the generator's default foliage density:

leafDensity moves those numbers a lot — each foliage cluster is its own mesh, so the oak preset (density 46) roughly doubles the detail-1 count. Read meshStats() rather than assuming.

Consumers

mcp/generator.js and mcp/export.js are the shared core. Anything that depends on them should pull this repo as a git dependency rather than copying the files — the copies drift.