@ifc-lite/viewer-core

Interactive 3D viewer for IFC models: a self-contained WebGL 2 browser viewer served from a local Node HTTP server, with a REST command API and server-sent events for live control. This is the engine behind ifc-lite view and ifc-lite analyze in the CLI; scripts and external tools can drive the running viewer (colorize, isolate, section, camera) over plain HTTP.

Install

npm install @ifc-lite/viewer-core

Usage

import { startViewerServer } from '@ifc-lite/viewer-core';

const server = await startViewerServer({
  filePath: '/path/to/model.ifc',
  fileName: 'model.ifc',
  port: 3456, // 0 = auto-assign
  onReady: (port, url) => console.log(`Viewer at ${url}`),
});

// Push a command to all connected browser viewers
server.broadcast({ action: 'colorize', type: 'IfcWall', color: [1, 0, 0, 1] });

The same command channel is exposed over REST while the server runs:

curl -X POST http://localhost:3456/api/command \
  -H 'Content-Type: application/json' \
  -d '{"action":"colorize","type":"IfcWall","color":[1,0,0,1]}'

Features

• WebGL 2 renderer with selection, isolation, x-ray, section planes, camera presets, and per-entity colorization
• REST /api/command endpoint plus SSE push; VALID_ACTIONS lists the accepted actions (colorize, isolate, xray, flyto, highlight, section, colorByStorey, addGeometry, setView, camera, and more)
• startViewerServer returns a ViewerServer handle: broadcast, clientCount, and access to created IFC segments
• Optional createHandler wires the /api/create endpoint for live element creation
• Streaming adapters (createStreamingViewerAdapter, createStreamingVisibilityAdapter) and getViewerHtml for embedding the page elsewhere
• WASM-powered parsing and geometry, no browser plugins required

Note: the npm package name is @ifc-lite/viewer-core; in the monorepo it lives at packages/viewer.

Links

• Docs: https://ifclite.dev/docs/
• Source: https://github.com/LTplus-AG/ifc-lite

License

MPL-2.0