Lumen is Unreal Engine 5’s revolutionary fully dynamic global illumination and reflections system that is designed for next-generation consoles. Lumen is the default global illumination and reflections system in Unreal Engine 5. It renders diffuse interreflection with infinite bounces and indirect specular reflections in large, detailed environments at scales ranging from millimetres to kilometres.
To illustrate Nanite's potential, a developer of Epic games studio Brian Karis released a complete documentation explaining how and why the tool was developed.t was developed. He has also mentioned what it is capable of, etc.