Archive notice: This article covers the first Unreal Engine 5 preview from May 2020. Release dates, licensing and implementation details are historical.
Epic Games introduced two core Unreal Engine 5 systems in its first public demo: Nanite virtualised geometry and Lumen dynamic global illumination.
Nanite geometry
Nanite was presented as a way to import extremely dense source meshes while reducing the need for manually authored lower-detail levels and baked normal maps. The demo framed geometry as virtualised data streamed at the detail required for the current view.
Lumen lighting
Lumen reacted to scene and lighting changes with dynamic global illumination, targeting real-time indirect-light updates without a conventional offline bake.
Historical roadmap and royalties
The preview was planned for early 2021, with a production-ready release expected later that year. Epic also raised the royalty-free lifetime gross-revenue threshold to US$1 million, retroactive to 1 January 2020.
Teams should check current hardware, renderer support, migration rules and licence terms before planning around the original preview claims.
