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Mastering Game Development with Unreal Engine 4 - Second Edition by Matt Edmonds

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Learning Lightmass settings and previewing tools

First, let's take a look at the global Lightmass settings, found in World Settings:

The first five options affect indirect lighting the most. If your lighting times are very large, setting the static lighting level to greater than 1 can drastically reduce your lighting build times by scaling the sampling size. If lighting build times for various levels or a whole game are becoming a problem, and your game and team can live with the quality reduction in lighting accuracy, try this first. The number of bounces can similarly have a significant impact. The purpose of indirect lighting is to simulate ...

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