4/1/2023 0 Comments Fortnite eventWe were going to have to make every optimization possible while not compromising on next-generation lighting quality. This is an extremely small budget as-it’s common for triple-A games to spend four milliseconds on ray-traced reflections alone. Considering all of the rendering features that we wanted, we were only going to have four milliseconds for dynamic global illumination and reflections combined. Fortnite targets a minimum of 60 fps on consoles, which is only 16.67 milliseconds per frame, or even less with headroom for dynamic resolution and gameplay costs during heavy combat. Lumen does amortize its calculations across multiple frames to reduce cost, but with the high frame rate that Fortnite targets, temporal accumulation artifacts are minimized.Īs we wrapped up work on the Unreal Engine 5.0 release, our focus turned to Fortnite Battle Royale Chapter 4 and its challenges. Lumen is fully dynamic and reacts to these changes in real time. In Chapter 4, Lumen calculates global illumination at high quality, adding back the warm sunlight bounce and detailed indirect shadows.įortnite Battle Royale has many game events that require dynamic lighting-the time of day will change, players can build and destroy structures, open doors, and so on. Only Distance Field Ambient Occlusion was used for ambient lighting, causing interiors to feel cold as the blue skylight leaks into buildings. Lumen in Fortnite Battle Royale Chapter 4īefore Chapter 4, Fortnite was limited to Unreal Engine 4’s dynamic lighting technologies on next-generation consoles. Lumen is enabled on PC and cloud gaming whenever the “Global Illumination” quality setting is set to “High” or “Epic,” with an option to use hardware ray tracing for even greater quality where supported by the video card. We also wrote an earlier tech blog introducing Lumen that we highly recommend reading for a general overview of the system.įortnite Battle Royale Chapter 4 ships with Lumen enabled on Playstation 5, Xbox Series X and Xbox Series S. In this blog post, we’re going to take you through how Lumen is working in Fortnite Battle Royale Chapter 4, and highlight the improvements the team made to Lumen while shipping Chapter 4 (which are now available to all developers in Unreal Engine 5.1). Lumen is Unreal Engine 5's fully dynamic global illumination and reflections system, which is enabled out of the box. Hi, we're Daniel Wright and Krzysztof Narkowicz, engineers working on Lumen.
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