We compared Lumen with RTX Global Illumination (RTXGI), which is more advanced than the default RTX in Unreal Engine 5. Lumen is easier to use for CG artists than Ray Tracing as in the Post Process Volume there are only two Lumen settings: Global Illumination and Reflections. The global illumination provided by Lumen has a fantastic result and accuracy, with more tonal variations than Ray tracing. Lumen has an advantage in terms of hardware requirements because it does not imply the same level of light calculation as ray tracing. To use the Ray Tracing technology, you need a video card containing RT cores the more of them, the better the performance. ![]() Global Illumination in Lumen (left) compared to Ray Tracing (right) set up in a dining room You can use baked lightmaps and add ray tracing reflections or do reflections with cube maps and SSR. It’s flexible because you can mix raster and ray tracing rendering features together, crafting the scene you want. Ray Tracing is indeed a powerful and flexible lighting system. Ray Tracing works in much the same way as this physical process but in reverse order. As a result, the brain makes a picture based on these rays. Ray Tracing works by simulating actual light rays, using an algorithm to trace the path that a beam of light would take in the physical world when photons fly out of a light source, bounce off and through various surfaces, and then are perceived by our eyes. Ray Tracing technology looks more natural and produces soft shadowing for lights, accurate ambient occlusion (AO), interactive global illumination, reflections and translucency. Hardware Ray Tracing is more accurate but more expensive. It supports a range of geometry types by tracing against triangles and evaluating lighting where the rays hit. Lumen also provides Hardware Ray Tracing. Ray Tracing does not have this drawback, as it does not use upscaling. Because the Lumen method uses upscaling, flickering may occur at high resolutions. Thus, it is an innovative solution to the highly intensive hardware-accelerated ray tracing method. The engine does all the heavy lifting, and Lumen does not affect the assets gathered in a scene. Then, the output lighting is upscaled and displayed as a cube map. This lightmap is then used to trace the path taken by every ray in the scene. ![]() Light behavior in this low-res model is then recorded, and a rough lightmap is created. Lumen takes any given scene and renders a very low-resolution model of it. It traces against the depth buffer first, which we call Screen Traces, then it traces against the distance field and applies lighting to ray hits with the Surface Cache. ![]() Lumen is a hybrid tracing pipeline that uses Software Ray Tracing. The entire city of Mumbai built with Unreal Engine 5 Understanding the difference between Lumen and Ray Tracing Lumen renders diffuse inter-reflection with infinite bounces and indirect specular reflections in large detailed environments at scales ranging from millimeters to kilometers.įor the interactive L-TOUCH presentation of Birla Niyaara development in Mumbai designed by Foster and Partners, the entire cityscape of the iconic Worli district was recreated in Unreal Engine 5 to highlight the future project location among other notable surroundings. Lumen is a fully dynamic global illumination and reflections system designed for next generation consoles that operates by default in Unreal Engine 5. Future of Lumen in photorealistic visualization. ![]()
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