UE5: Creating HLODs with Cesium actors crashes engine

Cesium for Unreal
1

Hi,

I’m trying to create the HLODs for my meshes (buildings) I’m using e.g. for our airport. The actors are handled using the new UE5 WorldPartition.

I exluded all CESIUM actors from HLOD generation:

HLOD1
HLOD11920×701 118 KB

Then I create HLODs:

HLOD
HLOD1920×693 117 KB

And then the engine crashes:

Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 10] Cast of Cesium3DTileset /Game/Maps/EDMO.EDMO:PersistentLevel.CesiumWorldTerrain_1 to MetaData failed

UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_WorldPartitionEditor
UnrealEditor_WorldPartitionEditor
UnrealEditor_WorldPartitionEditor
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_LevelEditor
UnrealEditor_LevelEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
UnrealEditor_ApplicationCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

For a test I removed all Cesium3DTilesets from the project, after this the HLODs were created without crashing UE5.

Best
Andreas

2

That looks like the exact same error you get when you remove a tileset. I suspect if we solve that one, this one will be solved as well.