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World Partition Conversion Issues

Development Discussion Unreal Engine 5 Early Access Feedback for Unreal Engine 5 Early Access
#1

I have been unable to successfully convert a World Composition level from UE4.26.2 to UE5 EA. I followed the steps located at World Partition | Unreal Engine Documentation for doing the Conversion, but keep getting an error.

Steps to reproduce:

  1. Open 4.26 project with UE5.
  2. Create a copy for conversion.
  3. Run commandlet using UE5 binaries (though using the 4.26 binaries didn’t work either).

world_partition_commandlet_error
world_partition_commandlet_error1302×517 50.5 KB

Running the commandlet with 4.26 appears to complete successfully, but the window closes before I can screenshot the output. However, when I check my project, there is no External Actors folder that I would expect to see.

Some feedback for the Unreal devs:

  • Running the commandlet causes another terminal window to open, run and then immediately close. This is not helpful for debugging as you have to try to screenshot before it closes.
  • There is no documented location for commandlet logs that I could find.
  • The conversion example usage of mapname is ambiguous and should be replaced with either a sample path (e.g. C:\Projects\Example\Content\Maps\Test.umap) or a correct substitute.
  • The documentation could also explain whether the conversion needs to be done prior to or post conversion to a UE 5 project.
2 Likes
#2

… add > output.txt to your commandline to catch a log.

X:\UnrealEngine\Engine\Binaries\Win64>UnrealEditor.exe -run=WorldPartitionConvertCommandlet F:\ue5_playground\Content\Maps\chaosvehicleMap.umap -AllowCommandletRendering > r:\output.txt

getting same errors no matter what i use for “mapname”,
try without “-AllowCommandletRendering” option, outputs a different error.

(tried both, converting 4.26 original map and 5.01ea migrated level)

1 Like
#3

Ok, after piping out the output to a text file, I cannot get anything other than:

[2021.06.03-18.04.29:652][ 0]LogWorldPartitionConvertCommandlet: Error: Unknown level ‘C:\Unreal Projects\GameName\Content\Maps\Overworld\Persistent_Level.umap’

#4

I’ve found the relevant code that’s producing the log line:

if (!FPackageName::SearchForPackageOnDisk(Tokens[0], &Tokens[0]))
{
	UE_LOG(LogWorldPartitionConvertCommandlet, Error, TEXT("Unknown level '%s'"), *Tokens[0]);
	return 1;
}

But I can’t for the life of me figure out what the proper Long or Short Package name is!

#5

The package name would be the name of the map file itself. (Either testmap.umap or in engine testmap.testmap); The short package name is just the name of the file (testmap.testmap), the long package name is the full path to the map (Game/Maps/testmap.map)

The bit of code you posted is just printing an error if it cannot find the specified map file.

That being said, I can’t get the conversion to work either. :\

#6

I figured it out with the help of the discord channel. The documentation as usual is terrible. What you need to run in powershell command line is this:
& .\UnrealEditor.exe “Path/To/UProjectFile/Here.uproject” -run=WorldPartitionConvertCommandlet “MapName” -AllowCommandletRendering 2>&1 | Out-File .\output.txt

NOTE: MapName does not need to have the .umap extension specified.
The full command I ran on my local computer for one of my projects:
& .\UnrealEditor.exe “E:/Repos/Raevin 5.0/Raevin.uproject” -run=WorldPartitionConvertCommandlet “CtrlRigMapTest4” -AllowCommandletRendering 2>&1 | Out-File .\output.txt

5 Likes
#7

Ah, thanks for finding that you need the project in there! I added that and it totally worked!

Glad to see it’s just a matter of documentation and not a faulty commandlet.

#8

I tried putting this in the Target field in the shortcut properties of a UnrealEditor.exe shortcut:

“E:\Program Files\Epic Games\UE_5.0EA\Engine\Binaries\Win64\UnrealEditor.exe” "E:\Projects\ValleyoftheAncient\ValleyoftheAncient.uproject” -run=WorldPartitionConvertCommandlet “Megascans_Asset_Zoo2” -AllowCommandletRendering 2>&1 | Out-File .\output.txt

The engine starts but there is no converted map in the folder.

Can anyone explain what I’m doing wrong?

Thanks.

#9

this worked for me:

UnrealEditor.exe “E:/Documents/Unreal Projects/AUH_Digital_Twin_Explorer/AUH_Digital_Twin.uproject” -run=WorldPartitionConvertCommandlet “AUH_Digital_Twin” -AllowCommandletRendering > e:\output.txt

#10

I’ve tried running this but all I get is ‘access is denied.’ Anyone know how to solve this?

#11

Maybe try running command prompt as administrator.

World Partition conversion