This could probably help Newbies in GPU Lightmass.
-
Open the file BaseLightmass.ini located in your UE version in the folder Engine/Config
Example: “D:\Program Files\Epic Games\UE_4.26\Engine\Config\BaseLightmass.ini” -
Scroll to the end and find NumPrimaryGISamples and NumSecondaryGISamples
-
Change values for Quality:
Preview
NumPrimaryGISamples=16
NumSecondaryGISamples=8
Medium
NumPrimaryGISamples=32
NumSecondaryGISamples=16
High
NumPrimaryGISamples=64
NumSecondaryGISamples=32
Extreme
NumPrimaryGISamples=128
NumSecondaryGISamples=64
Special Thanx to @Luoshang and @ they´ve been making our job much easier this years, keep up the good work 
