UMaterialInstance::StaticClass()->GetFName() does not work

[alisahanyalcin]

i’m trying to collect all material and material instance but i can’t access any material instance what can i do?

CompilerActor.cpp;

#include "CompilerActor.h"
#include "AssetRegistry/AssetRegistryModule.h"
#include "Materials/Material.h"
#include "AssetRegistry/AssetData.h"

// Sets default values
ACompilerActor::ACompilerActor()
{
    PrimaryActorTick.bCanEverTick = true;

}

// Called when the game starts or when spawned
void ACompilerActor::BeginPlay()
{
    Super::BeginPlay();

    FAssetRegistryModule& AssetRegistryModule = FModuleManager::LoadModuleChecked<FAssetRegistryModule>("AssetRegistry");
    AssetRegistryModule.Get().SearchAllAssets(true);

    AssetData.Empty();

    AssetRegistryModule.Get().GetAssetsByClass(UMaterial::StaticClass()->GetFName(), AssetData);
    AssetRegistryModule.Get().GetAssetsByClass(UMaterialFunction::StaticClass()->GetFName(), AssetData);
    AssetRegistryModule.Get().GetAssetsByClass(UMaterialInstance::StaticClass()->GetFName(), AssetData);

    for (int32 i = 0; i < AssetData.Num(); ++i)
	{
		FAssetData& Asset = AssetData[i];
        UE_LOG(LogTemp, Warning, TEXT("Asset: %s, Class: %s, Path: %s"), *Asset.AssetName.ToString(), *Asset.AssetClass.ToString(), *Asset.PackagePath.ToString());
	}

}

// Called every frame
void ACompilerActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

}

CompilerActor.h;

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "CompilerActor.generated.h"

UCLASS()
class CHARACTERCREATORV2_API ACompilerActor : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	ACompilerActor();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
	TArray<FAssetData> AssetData;

};

this code return 1168 material and material function but 0 material instance.
i’m sure i’m using correct class type according to this doc Materials | Unreal Engine Documentation. is there any different way to access material instance?

[alisahanyalcin]

#include "CompilerActor.h"
#include "AssetRegistry/AssetRegistryModule.h"
#include "Materials/Material.h"
#include "Materials/MaterialInstance.h"
#include "AssetRegistry/AssetData.h"

// Sets default values
ACompilerActor::ACompilerActor()
{
    PrimaryActorTick.bCanEverTick = true;

}

// Called when the game starts or when spawned
void ACompilerActor::BeginPlay()
{
    Super::BeginPlay();

    FAssetRegistryModule& AssetRegistryModule = FModuleManager::LoadModuleChecked<FAssetRegistryModule>("AssetRegistry");
    AssetRegistryModule.Get().SearchAllAssets(true);

    AssetData.Empty();

   AssetRegistryModule.Get().GetAssetsByClass(UMaterial::StaticClass()->GetFName(), AssetData, true);
    AssetRegistryModule.Get().GetAssetsByClass(UMaterialFunction::StaticClass()->GetFName(), AssetData, true);
    AssetRegistryModule.Get().GetAssetsByClass(UMaterialInstance::StaticClass()->GetFName(), AssetData, true);


    for (int32 i = 0; i < AssetData.Num(); ++i)
	{
		FAssetData& Asset = AssetData[i];
        UE_LOG(LogTemp, Warning, TEXT("Asset: %s, Class: %s, Path: %s"), *Asset.AssetName.ToString(), *Asset.AssetClassPath.ToString(), *Asset.PackagePath.ToString());
	}

}

// Called every frame
void ACompilerActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

}