I run 4.13.0
Why does this tell me this?
SCENE IS LARGE AND WILL not Yield GOOD RESULTS
Sorry for caps
tightly boundry lightmass ??
You need to create a Lightmass Bounding Volume, and size it so that it surrounds all the areas where the player will go or watch in detail.
If there are distant areas (mountains/hills/buildings) that the player will not go near, then the lightmass importance volume doesn’t need to include those.