In Unreal Engine 4, features such as Screen Space Global Illumination were not reliable and Ray Tracing Global Illumination (RTGI) was not performant for games with a high enough quality, and didn't integrate with other important systems. Lumen brings robust dynamic global illumination to Unreal Engine for the first time and integrates well with other supporting systems in UE5, like Nanite. Static Light contribution is disabled and all lightmaps are hidden when Lumen is enabled. Lumen Reflections replace Unreal Engine 4's Screen Space Reflections. Lumen Global Illumination replaces Screen Space Global Illumination (SSGI) and Distance Field Ambient Occlusion (DFAO).
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This property also sets the Reflection Method to Lumen, and enables Generate Mesh Distance Fields which is required for Lumen's Software Ray Tracing mode. Set Dynamic Global Illumination Method to Lumen. Lumen is enabled through the Project Settings under the Rendering > Dynamic Global Illumination category. This is to prevent breaking or changing of any lighting paths within those projects. Newly-created projects in Unreal Engine 5 have Lumen Global Illumination and Reflections enabled by default, as well as their dependencies like Generate Mesh Distance Fields.įor existing projects, like ones created using Unreal Engine 4, Lumen is not automatically enabled. It renders diffuse interreflection with infinite bounces and indirect specular reflections in large, detailed environments at scales ranging from millimeters to kilometers. Lumen is the default global illumination and reflections system in Unreal Engine 5. Lumen is Unreal Engine 5's new fully dynamic global illumination and reflections system that is designed for next-generation consoles. Disabling Static Lighting for the Project
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