TwinCity

Mixed Reality Digital Twin city simulation
Developed as part of the course Design for Complex and Dynamic Contexts (DCDC) at Stockholm University (SU), Spring 2025.

📍 Overview

TwinCity is an experimental Mixed Reality (MR) platform that overlays a real-time 3D model of a city using Unity, Cesium for Unity, and Google Photorealistic 3D Tiles. The system serves as a collaborative emergency response environment, enabling users to explore, simulate disasters, and coordinate interventions inside a Digital Twin of a real-world location.

This project was developed by a four-person team at SU to explore concepts of:

Mixed Reality spatial interfaces
Collaborative interaction and role-based interdependence
Digital Twins as real-time responsive environments

🔧 Technologies Used

Unity 6 LTS
Cesium for Unity
Google Maps 3D Tiles API
Meta XR SDK (Passthrough + Hand Tracking)
Photon Fusion (Multiplayer Framework)
Visual Studio Code + GitHub

🧪 Features (in development)

✅ 3D photorealistic Digital Twin city rendered in Unity
✅ Flood simulation using water plane or visual overlays
✅ MR interface with gesture-based navigation
🔄 Multiplayer interaction for emergency response roles
🔄 Visual indicators and alerts for dynamic events
🔄 Subscene placement and collision-aware environment

🎮 How to Run

Requires Unity 6 LTS and Cesium for Unity setup.

Clone the repo: git clone https://github.com/<your-username>/twincity.git
Open in Unity 6
Sign in to your Cesium account
Enter your Google Maps API key to load 3D tiles
Enter Play Mode

👥 Team

Andreas – Backend, Unity architecture, repo management
Eman – UI/UX design, Figma mockups, portfolio materials
Florian – Lead Unity implementation, Cesium integration
Minhui – Interaction design, XR design, Documentation, Testing, and Research

📁 License

This project is open source under the MIT License.

💡 Acknowledgments

Cesium for Unity: https://cesium.com/unity
Google Maps Photorealistic Tiles
Original concept inspiration: YouTube Video

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