A key highlight was Lumen, which is described by epic as a fully dynamic global illumination solution that immediately reacts to scene and light changes. The system renders diffuse interreflection with infinite bounces and indirect specular reflections in huge, detailed environments, at scales ranging from kilometers to millimeters. Artists and designers can create more dynamic scenes using Lumen, for example, changing the sun angle for time of day, turning on a flashlight, or blowing a hole in the ceiling, and indirect lighting will adapt accordingly. Lumen erases the need to wait for lightmap bakes to finish and to author light map UVs—a huge time savings when an artist can move a light inside the Unreal Editor and lighting looks the same as when the game is run on console.
Unreal Engine 5 details— Nibel (@Nibellion) May 13, 2020
– can use movie assets that consist of hundreds of millions or billions of polygons
– new dynamic GI solution called Lumen
– no LODs or pop-ins
– Out in 2021, supports current-gen and next-gen devices + iOS, Android, Mac and PChttps://t.co/aSWzmBtbtl pic.twitter.com/54Jh6jIwCU
Epic also revealed Nanite, which is virtualized micropolygon geometry frees artists to create as much geometric detail as the eye can see. Nanite virtualized geometry means that film-quality source art comprising hundreds of millions or billions of polygons can be imported directly into Unreal Engine—anything from ZBrush sculpts to photogrammetry scans to CAD data—and it just works. Nanite geometry is streamed and scaled in real time so there are no more polygon count budgets, polygon memory budgets, or draw count budgets; there is no need to bake details to normal maps or manually author LODs; and there is no loss in quality. All exciting things to look forward to as developers contiue to push gaming forward.