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Guide · Open source

How to use multipleWindow3dScene: run a synced 3D scene across windows

Updated · written with AI from the project's own documentation and checked against our catalogue data

multipleWindow3dScene is a small open-source example that shows how a three.js 3D scene can be synchronized across several browser windows using localStorage. This guide walks you through cloning it, opening it in a browser, and finding the files that do the window management and rendering. By the end you will know what each file is responsible for and where to start if you want to adapt the approach.

multipleWindow3dScenebgstaal/multipleWindow3dScene · ★ 18.9k · MIT

Quick start

  1. 1Install Git and a modern browser. Confirm you have Git available in your terminal and a modern web browser installed.
  2. 2Clone the repository. Run git clone https://github.com/bgstaal/multipleWindow3dScene to download the project.
  3. 3Open index.html. In the cloned folder, open index.html in your browser to start the 3D scene.
  4. 4Open more windows. Open additional windows showing the same page to see the scene synchronized across them.
  5. 5Read WindowManager.js. Review the core class that manages window creation, synchronization and localStorage state.
  6. 6Edit main.js. Change the scene setup or event handling in main.js and reload the windows to see the effect.

What you need before you start

The project's README lists two prerequisites: Git, to clone the repository, and a modern web browser, to run the scene. The README does not list any other tools, packages or build steps.

  • Git
  • A modern web browser

Clone the repository

Open a terminal and run the clone command from the README. This copies the project files into a local folder.

git clone https://github.com/bgstaal/multipleWindow3dScene

Open the scene in your browser

The README says to open index.html in your browser to start exploring the 3D scene. index.html is the entry point: it sets up the HTML structure and includes the Three.js library and the main script. Open several browser windows on the same page to see the scene synchronized across them.

  • Open index.html from the cloned folder in your browser.
  • Open additional windows pointing to the same page to observe the synchronization.

Understand the project files

The README describes four main files. Knowing their roles makes the code easier to read.

  • index.html: entry point that sets up the HTML and includes Three.js and the main script.
  • WindowManager.js: core class that handles window creation, synchronization and state management across windows, using localStorage.
  • main.js: initializes the 3D scene, handles window resize events and updates the scene based on window interactions.
  • three.r124.min.js: minified Three.js library used for rendering.

Adapt the example for your own experiment

The README invites contributions and says you can fork the repository, make changes and submit pull requests. A practical way to learn is to change the scene in main.js and watch how the change appears in each window. Keep the synchronization logic in WindowManager.js separate so you can see which part handles shared state.

  • Fork the repository on GitHub if you want to keep your own changes.
  • Edit main.js to change how the scene is drawn or how it reacts to window events.
  • Read WindowManager.js to see how state is written to and read from localStorage.

What people use it for

  • Learning how three.js renders a scene and handles resize events.
  • Studying how localStorage can pass state between browser windows.
  • Using the project as a minimal starting point for a multi-window visual experiment.

Frequently asked questions

Is multipleWindow3dScene free to use?

Yes. The project is open-sourced under the MIT License, as stated in the README. You can use, change and redistribute it under those terms.

What do I need to run multipleWindow3dScene?

The README lists Git and a modern web browser. You clone the repository and open index.html in the browser. It does not describe any other install steps.

Do I need to install anything with npm?

The README does not mention npm or any package installation. Its only install instruction is to clone the repository and open index.html.

Is this a library I can add to my project?

Not as described. The project is an example that demonstrates one approach to multi-window 3D graphics. It is not presented as a reusable package, so you would copy and adapt its code.

Can I use it in production for state sync between windows?

The README does not describe error handling, conflict resolution or scaling. For production state sync you would need to evaluate those yourself before relying on this approach.

What are alternatives to multipleWindow3dScene?

Projects listed as comparable include BroadcastChannel API demos, tiny three.js examples and the Three.js official examples. These cover related ideas such as message passing between windows and minimal three.js scenes.

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Our verdict

Choose multipleWindow3dScene if you are a developer or student who wants a small, readable reference for combining three.js with localStorage across windows. Pick a different tool if you need a finished application, a reusable library, or production-grade state synchronization.

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