Making Digital Twins Playable: From UEFN to Unreal Engine | Unreal Fest Stockholm 2025

What if a city’s digital twin could be more than a static model, and it could be played with, explored, and learned from? In this session recorded at Unreal Fest Stockholm, Tomas Nihlén of Tomlin Studio shares how the company brought part of a digital twin of the city of Norrköping into Fortnite using UEFN, and made it available as a sandbox template for others to learn from and build on.

With Cesium and Google 3D Tiles as the foundation, Tomlin Studio is now exploring how to create immersive city simulations using real-world data in Niagara and high-fidelity points of interest with 3D Gaussian splatting and photogrammetry.

Tomas shares the company’s experiences working with different types of digital twins, including the pros and cons of using 3D gaussian Splatting versus photogrammetry, and the technical limitations faced in UEFN.

This talk walks through the technical setup, lessons learned, and future possibilities to make digital twins playable, bridging the gap between games, urban tech, and immersive learning.

Learn more about UEFN here: unrealengine.com/uses/uefn-unreal-editor-for-fortnite

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