What the good method for import a fbx file in editor with c++ ?

Development Pipeline & Plugins Plugins
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1

Hello,
I’m working on a plugin that import a StaticMesh into the Content Browser (not runtime) but the import does not seem to work. :confused:
The file Mesh.uasset is created in Content\MyMeshFolder but it is only 1Ko and is not readable by the engine
This is the first time I made an fbx import in C++, I do not think I’m using the right method and I do not see how to do this

This is my current code

FReply SBlenderImporterAssetSlate::ImportButtonClicked()
{
	UE_LOG(LogTemp, Warning, TEXT("Start"));
	UnFbx::FFbxImporter* FbxImporter = UnFbx::FFbxImporter::GetInstance();
	if (FbxImporter->ImportFromFile(FbxPath, TEXT("fbx")))
	{
		UE_LOG(LogTemp, Warning, TEXT("ImportFromFile success"));
		TArray<FbxNode*> FbxMeshArray;
		FbxImporter->FillFbxMeshArray(FbxImporter->Scene->GetRootNode(), FbxMeshArray, FbxImporter);
		UFbxStaticMeshImportData* ImportData = NewObject<UFbxStaticMeshImportData>(GetTransientPackage(), "MyImportData", RF_NoFlags, nullptr);
		ImportedMesh = FbxImporter->ImportStaticMeshAsSingle(GetTransientPackage(), FbxMeshArray, "MyMesh", RF_Public, ImportData, ImportedMesh);

		if (ImportedMesh->GetFullName() != "None")
		{
			UE_LOG(LogTemp, Warning, TEXT("ImportStaticMeshAsSingle success"));
			UPackage* Package = CreatePackage(NULL, TEXT("/Game/MyMeshFolder/Mesh")); //Create package if not exist
			Package->FullyLoad(); //Load full package for import
			Package->MarkPackageDirty(); // Mark package dirty to be able to save it
			FAssetRegistryModule::AssetCreated(ImportedMesh); //Notifies registry of new asset in-memory
			FString PackageFileName = FPackageName::LongPackageNameToFilename(TEXT("/Game/MyMeshFolder/Mesh"), FPackageName::GetAssetPackageExtension());
			bool bSaved = UPackage::SavePackage(Package, ImportedMesh, EObjectFlags::RF_Public, *PackageFileName, GError, nullptr, true, true);
			if (bSaved == true)
			{
				UE_LOG(LogTemp, Warning, TEXT("Saved package"));
			}
		}
	}
	return FReply::Handled();
}

And this the Output Log

LogTemp: Warning: Start
LogSlate: Took 0.000287 seconds to synchronously load lazily loaded font '../../../Engine/Content/Slate/Fonts/Roboto-Light.ttf' (167K)
LogFbx: Loading FBX Scene from G:\SM_SuzanneLod0.fbx
LogFbx: FBX Scene Loaded Succesfully
LogTemp: Warning: ImportFromFile success
LogFbx: Warning: Triangulating static mesh SuzanneLod0
LogFbx: Warning: Warning: The imported mesh is very small. This is most likely an issue with the units used when exporting to FBX.
LogTemp: Warning: ImportStaticMeshAsSingle success
LogSlate: FSceneViewport::OnFocusLost() reason 2
LogSavePackage: Save=50.57ms
LogSavePackage: Moving '../../../../../../Projet perso/Unreal Projects/Marketplace/Blender For Unreal Import/Engine 4.19/Saved/Mesh6F4104AB4DB366300413F78EB2E07A03.tmp' to '../../../../../../Projet perso/Unreal Projects/Marketplace/Blender For Unreal Import/Engine 4.19/Content/MyMeshFolder/Mesh.uasset'
LogSavePackage: Display: Finished SavePackage ../../../../../../Projet perso/Unreal Projects/Marketplace/Blender For Unreal Import/Engine 4.19/Content/MyMeshFolder/Mesh.uasset
LogTemp: Warning: Saved package

Thank you for your help, Xavier.

1 Like
2

Hi Loux,

Is there a reason you are attempting to write an FBX importer yourself? The engine has native support for FBX meshes.

3

Hi Darkwind,
Yes, I’m working on a plugin that will import and configure multiple assets at the same time via an .ini file

4

Hi Loux,

Looking at the source, importing an FBX file seems to be much more complicated than what your code is doing. I would suggest looking at the implementation of UFbxFactor::FactoryCreateFile (located in %EngineInstallDir%\Engine\Source\UnrealEd\Private\Fbx\FbxFactory.cpp) for reference. Note, though, that your plugin will be subject to any future changes to the FBX import system.

5

Thank you so much Darkwind.

I did some research about UFbxFactory::FactoryCreateFile and I redid my code and it works!

	UE_LOG(LogTemp, Warning, TEXT("Start02"));
	UFbxFactory* factory = NewObject<UFbxFactory>(UFbxFactory::StaticClass(), FName("Factory"), RF_NoFlags);
	factory->ImportUI->StaticMeshImportData->bCombineMeshes = true;

	bool canceled = false;
	UPackage* Package = CreatePackage(NULL, TEXT("/Game/MyMeshFolder/Mesh")); //Create package if not exist
	factory->ImportObject(factory->ResolveSupportedClass(), Package, FName("MyMesh"), RF_Public | RF_Standalone, FbxPath, nullptr, canceled);
	if (canceled == true)
	{
		UE_LOG(LogTemp, Warning, TEXT("Import canceled."));
	}
6

I’ve tried a lot of different ways to get this to work and still nothing is perfect. Here’s a post with all of my code and maybe something will help you and you could help me.
fbx-automated-command-line-import