A web-based userinterface for Geant4 detector definition built on the official Three.js Editor.

1. Clone the repository with submodules: git clone --recursive <repo-url>
2. Install dependencies: npm install
3. Start the development server: npm run dev

This project uses a non-destructive customization approach to remain compatible with upstream Three.js updates.

Please read CONTRIBUTING.md before making any changes to the UI or behavior.