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UE4 Custom Pak load


I got a problem when loading assets from .pak from builded application.

This is my workflow:

1 - Import 3D model (fbx + texture), so in my project I got:

  • material.uasset

  • skeletalMesh.uasset

  • physicsAsset.uasset

  • skeleton.uasset

  • texture.uasset

2 - I pak all these assets into a pak file with UnrealPak command line:

UnrealPak.exe ".path/to/6737.pak" -Create="path/to/filesToPak.txt" -encryptionini -platform=Windows -installed -UTF8Output -multiprocess -patchpaddingalign=2048 -abslog="path/to/6737.log"

3 - Unreal process:

  • Mount pak to path

  • Find files in MountPoint (files found with success)

  • Load files

This code work in Editor perfectly. I can load and build my character but when builded for Windows platform, I got this error when I try to load uasset:

Warning: Unable to load package (../../../UE4PakFiler/Content/UNPAK/6737_M.uasset). Package contains EditorOnly data which is not supported by the current build.


 void UMyClass::TestLoad(TArray<UObject*> &Classes)


     IPlatformFile& PlatformFile = FPlatformFileManager::Get().GetPlatformFile();
     FPakPlatformFile* PakPlatformFile = new FPakPlatformFile();
     PakPlatformFile->Initialize(&PlatformFile, TEXT(""));
     const FString PakFilename = TEXT("C:\\Users\\MAX\\Desktop\\CustomPak\\6737.pak");
     FPakFile PakFile(&PlatformFile, *PakFilename, false);
     if (PakFile.IsValid())
         UE_LOG(LogClass, Warning, TEXT("===== Pak file is valid ====="));
     FString MountPoint = "";
     MountPoint = FString("E:/Silkke/UE4/UE4PakFiler/Content/UNPAK");
     //MountPoint = FPaths::ProjectContentDir() + "UNPAK";
     //MountPoint = FPaths::ProjectPersistentDownloadDir();
     MountPoint = FPaths::ProjectContentDir() + "UNPAK";
     if (!PakPlatformFile->Mount(*PakFilename, 0, *MountPoint))
         UE_LOG(LogClass, Warning, TEXT("Mount failed"));
     UE_LOG(LogClass, Warning, TEXT("===== Pak mounted with success '%s' ====="), *PakFilename);
     UE_LOG(LogClass, Warning, TEXT("FileName: %s"), *PakFilename);
     UE_LOG(LogClass, Warning, TEXT("Mountpoint: %s"), *PakFile.GetMountPoint());
     TArray<FString> FileList;
     PakFile.FindFilesAtPath(FileList, *PakFile.GetMountPoint(), true, false, true);
     FStreamableManager StreamableManager;
     UE_LOG(LogClass, Warning, TEXT("Files found: %d"), FileList.Num());
     if (FileList.Num() > 0)
         UE_LOG(LogClass, Warning, TEXT("Files browse..."));
         for (auto f : FileList)
             FString AssetShortName = FPackageName::GetShortName(f);
             FString LeftStr;
             FString RightStr;
             AssetShortName.Split(TEXT("."), &LeftStr, &RightStr);
             //FString AssetName = FPaths::ProjectPersistentDownloadDir() + "/" + LeftStr + TEXT(".") + LeftStr;
             FString AssetName = TEXT("/Game/UNPAK/") + LeftStr + TEXT(".") + LeftStr;
             //FString AssetName = TEXT("/Game/6737/") + LeftStr + TEXT(".") + LeftStr;
             UE_LOG(LogClass, Warning, TEXT("AssetName: %s"), *AssetName);
             FStringAssetReference r = AssetName;
             UObject* LoadObject = StreamableManager.LoadSynchronous(r, true);
             if (LoadObject != nullptr)
                 UE_LOG(LogClass, Warning, TEXT("Asset loaded with success: %s"), *AssetName);
                 UE_LOG(LogClass, Warning, TEXT("Asset failed to load: %s"), *AssetName);
     if (PakPlatformFile->Unmount(*PakFilename))
         UE_LOG(LogClass, Warning, TEXT("===== Pak unmounted with success '%s' ====="), *PakFilename);

If someone can help me ? :)



Product Version: UE 4.21
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asked Apr 19 '19 at 09:54 AM in Packaging & Deployment

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21 3 5 7

avatar image nyudeb Apr 24 '19 at 08:50 AM

I found that the problem was how to package my assets... When I create a pak from the editor (build), I can load them. But when I create the pak via UnrealPak, something must be missing that makes the assets usable only via the Editor....

avatar image okynorch Apr 26 '19 at 07:23 PM

Same issue here, however if you set the build configuration to Shipping, there is no errors but it does not load the asset from the pak file. I tried to create the pak file from the editor, but that I am still not able to load the asset at runtime.

avatar image nyudeb Apr 29 '19 at 08:20 AM

I found the solution. You need to cook .uasset you want to use in Dev / Ship build. And you just need to drag'n'drop asset in editor + pak them to use them in Editor. So finally, you need 2 different .pak: cooked and uncooked

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