Pascal Editor

An open-source, local-first 3D building editor built with React Three Fiber and WebGPU. Run it in the browser or from the CLI, and connect AI agents through MCP.

https://github.com/user-attachments/assets/8b50e7cf-cebe-4579-9cf3-8786b35f7b6b

A first look at Pascal Next

Explore the live demo — a real home reconstructed in detail, from its rooms and finishes to the structure and systems behind the walls. This hosted preview explores the direction of the next Pascal editor; the experience shown here is not yet part of the open-source editor release.

Exploded view — see how the home fits together	Cut view — slice through the building
X-ray — reveal the modeled systems	Walkthrough — step inside at eye level
Interactions — open doors and explore	Environment — change the light and atmosphere

We are exploring what this could make possible for facility management, home services, architecture, home building, and infrastructure. Join the discussion on X and tell us where you would use it.

Make something with these videos

Making a video, tutorial, article, or social post about Pascal? You are welcome to use and edit this footage, including in monetized content, under CC BY 4.0. Credit Pascal, link the license, and note your edits; no separate permission is needed.

Download the six original videos and see the creator guide.

Run the Editor Locally

Node.js 22.13 or newer can create a persistent local Pascal installation without cloning this repository:

npx @pascal-app/cli editor

The CLI starts the editor and an authenticated MCP service in the background, selects collision-free loopback ports, and keeps projects in ~/.pascal/data/pascal.db. The npm package holds the CLI and that MCP service; the web editor runtime is downloaded once per version on the first command that starts the editor and verified against a digest published inside the package. Configure an agent to launch pascal mcp connect, which needs neither the editor process nor that download. Install the pascal command with npm install --global @pascal-app/cli. See Run Pascal locally for pnpm/Bun commands, project management, MCP setup, updates, storage paths, and troubleshooting.

Use one active agent client per local CLI service. The standalone local HTTP runtime shares active scene state between clients; use separate PASCAL_HOME directories and service processes when independent concurrent work is required.

Self-host it