Run in Node - OpenGeometry

Node has no Worker and cannot fetch a file: address. Pass the compiled module to create. Tessellation then runs inline.

import { readFileSync } from 'node:fs';
import { OpenGeometry } from 'opengeometry';

const wasm = readFileSync(new URL(import.meta.resolve('opengeometry/opengeometry_bg.wasm')));
await OpenGeometry.create({ wasmModule: new WebAssembly.Module(wasm) });

Write a STEP file

Modelling, queries and export need no display:

import { readFileSync, writeFileSync } from 'node:fs';
import { OpenGeometry, Solid, OG_PRIMITIVE_CYLINDER } from 'opengeometry';

const wasm = readFileSync(new URL(import.meta.resolve('opengeometry/opengeometry_bg.wasm')));
await OpenGeometry.create({ wasmModule: new WebAssembly.Module(wasm) });

const post = new Solid(OG_PRIMITIVE_CYLINDER, { radius: 0.1, height: 2.4 });
const { text } = await OpenGeometry.exportStep({ nodes: [post] });
writeFileSync('post.step', text);

Get a mesh

In Node nothing renders, so nothing asks for geometry. Walk the scene, then flush:

import { readFileSync } from 'node:fs';
import * as THREE from 'three';
import { OpenGeometry, Solid, OG_PRIMITIVE_SPHERE } from 'opengeometry';

const wasm = readFileSync(new URL(import.meta.resolve('opengeometry/opengeometry_bg.wasm')));
await OpenGeometry.create({ wasmModule: new WebAssembly.Module(wasm) });

const ball = new Solid(OG_PRIMITIVE_SPHERE, { radius: 1 });
const scene = new THREE.Scene();
scene.add(ball);
scene.updateMatrixWorld();
OpenGeometry.flush({ geometry: 'sync' });
console.log(ball.surface.geometry.getAttribute('position').count);

The mesh is in body.surface.geometry. After an edit, OpenGeometry.flush({ geometry: 'sync', bodies: [body] }) meshes only that body.

Tests

Call OpenGeometry.reset() between tests. It frees every body and leaves an empty document. A body from before the reset throws Disposed.

Last modified on November 10, 2026