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