Learn about dynamic lighting features we use in Fortnite with UE 4. We’ll take a look at how you can set these up, optimize them, and get the most out of your dynamically lit worlds to achieve the highest fidelity and save some performance in the process
https://dev.epicgames.com/community/learning/talks-and-demos/Gxj/fortnite-s-real-time-lighting-techniques-and-tools-gdc-2018-unreal-engine