UE 5.8 Lighting fails to build on the Mac

Development Platform & Builds
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1

1/ Make an empty project in Unreal 5.8

2/ Make an empty level and make it the starting level in editor and game

3/ Add a single cube but scaled it to be a floor plane

4/ Added a single point light and made it stationary

5/ Added a single light mass importance volume

6/ Set all the relevant switches so UE would bake the lighting.

7/ Saved everything.

However when I went to build lighting all proceeded as normal except lighting progress stuck at 0 and ultimately produced the Lighting Build Failed error message with no reason given. In activity monitor I can see LightMass appear and disappear so it seems to be talking to that however.

Is there any solution to this that is Mac based? Thanks in advance.

2

Add following settings to Config/DefaultLightmass.ini

[DevOptions.StaticLighting]
bUseEmbree=false

See this post

Almost every minor version breaks Lightmass now.

3

Many thanks for that. It allowed my base demo level to build the single static light.

This solution was so far out from all the things I was looking at. So esoteric.