Hi all,
LGPU 5.3.1 onward does NOT support Nanite Landscape. LGPU still support Nanite as it has before but this NEW 5.3 Nanite Landscape feature will cause Lightmass to crash with an Assertion failed error.
Attempting to add the same material twice with different export settings, this is not (currently) supported
This may be the same for CPU Lightmass or Epic Lightmass.
When you attempt to “Build Lighting” you will
The Warning error message is:-
[2023.11.08-17.51.07:387][359]LogWindows: Error: appError called: Assertion failed: ExportSettings == *ExistingExportSettings [File:D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Lightmass\Lightmass.cpp] [Line: 546]
Attempting to add the same material twice with different export settings, this is not (currently) supported
The obvious fix for this is to DISABLE (untick) Enable Nanite in the Landscape Detail box.