One of those features is World Partition, which handles the on-the-fly loading and unloading of open worlds as players move through them.
There are some features specific to open world games, too, which may be useful for CD Projekt Red's new Witcher game the studio announced last month that it's switching to Unreal Engine 5. The engine handles the 'making it run on our PCs' part, or at least more of it. With Nanite and Lumen, Epic says that developers can import film-quality 3D assets with "massive amounts of geometric detail" and set up dynamic lights without worrying about certain complex technical steps, especially those to do with optimization. The 2020 Unreal Engine 5 reveal video (opens in new tab) lead with its new "micropolygon geometry system," Nanite, and its "global illumination solution," Lumen.
Adoption of UE5 will mean different things for different studios, but the big themes are workflow streamlining and high-fidelity geometry and lighting.
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