Plugin - Get all materials in current project

Development Pipeline & Plugins Plugins
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1

Hi, I want to offer my users to pick a material from a dropdown list OR let them assign a material from the content browser. To both requirements I cannot find any solution (Neither to finding all materials in my project or just in one folder nor to display a material field in my plugin).

Can you give me any hint on how to do this?

2

Do you want them to do this in the editor? Or in your game?

3

In the editor.

4

Simply creating a property on a struct/class will allow the user to select the assets available in your project. For materials, use MaterialInterface, not Material.

In c++, you’ll need to make it a UPROPERTY with the ‘EditAnywhere’ flag.

5

Hi TTaM, thanks for your answer. Unfortunately I cannot use UPROPERTY in a plugin tab in Slate. For an actor sure, I’d simple chose a UPROPERTY to edit a material.

6

Slate? Oh, well, I’ll leave that to the experts.

7

push, any ideas? I don’t care if I show the materials just by names in a drop down or in an image in my slate widget. My problem is that I do not know how to determine all materials from the project in a widget. There must be some easy to use kind of function for that case, right?

8

Oh yes, I remember now. You can do this…

GetObjectsOfClass( UMaterialInterface::StaticClass(), … );

9

You might also need to use a UObjectLibrary to load all the materials, if they aren’t loaded automatically.

10

TTaM, you are great! With your help I managed to write a function to get all materials from the editor.

TArray<UMaterialInstance*>* RoadNetworkWidget::getMaterialInstancesFromPath(FString _path) {

	TArray<UMaterialInstance*>* result = new TArray<UMaterialInstance*>();

	UObjectLibrary *lib = UObjectLibrary::CreateLibrary(UMaterialInstance::StaticClass(), false, true);
	UE_LOG(LogTemp, Warning, TEXT("Searching for material instances in /Game/Materials..."));
	lib->LoadAssetDataFromPath(TEXT("/Game/Materials"));
	TArray<FAssetData> assetData;
	lib->GetAssetDataList(assetData);
	UE_LOG(LogTemp, Warning, TEXT("Found %d"), assetData.Num());

	for (FAssetData asset : assetData) {
		UMaterialInstance* mi = Cast<UMaterialInstance>(asset.GetAsset());
		if (mi) {
			UE_LOG(LogTemp, Warning, TEXT("Material instance %s"), *mi->GetName());
			result->Add(mi);
		}
	}
	return result;
}
11

Is this possible to do with BP?

12

Yes it is: http://api.unrealengine.com/INT/API/Runtime/Engine/Engine/UObjectLibrary/LoadBlueprintAssetDataFromPaths/index.html