언리얼C++ 오브젝트 생성, 애셋 레퍼런싱, 애셋 로딩

UObject생성

AActor

T* UWorld::SpawnActor( 
	FVector const& Location,
	FRotator const& Rotation,
	const FActorSpawnParameters& SpawnParameters
)

UClass

LoadClass<T>(NULL, TEXT("Game/....", NULL, LOAD_None, NULL);

UObject

template<class T>
T* NewObject(
	UObject* Outer = (UObject*)GetTransientPackage(),
	UClass* Class = T::StaticClass()
)

 

 

애셋 레퍼런싱

경로 지정시 Content/는 Game/으로

경로 : Project/Content/Character/MyCharacter.uasset

>> /Game/Character/MyCharacter

 

에디터에서 CopyReference시 내용

[Description]'[LongPackageName].[AssetName]'

- Description : Texture2D, WidgetBlueprint, SkeletalMesh, ...

- LongPackageName : /Game/Character/MyCharacter

- AssetName : MyCharacter

 

실제Path VS 언리얼의 Ref Path

Path : Project/Content/Character/MyCharacter.uasset

Ref Path : Description'/Game/Character/MyCharacter.MyCharacter'

+ Blueprint Path : /Game/Character/MyCharacter_C

- (블루프린트 클래스의 경우 다른 오브젝트와 구분 용도로 _C를 붙임)

 

파일로 레퍼런싱 관리

Default[GameTitle].ini 파일 생성

[/Script/ArenaBattle.ABCharacterNonPlayer]
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Barbarous.SK_CharM_Barbarous 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/sk_CharM_Base.sk_CharM_Base 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Bladed.SK_CharM_Bladed 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Cardboard.SK_CharM_Cardboard 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Forge.SK_CharM_Forge 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_FrostGiant.SK_CharM_FrostGiant 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Golden.SK_CharM_Golden 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Natural.SK_CharM_Natural 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Pit.SK_CharM_Pit 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Ragged0.SK_CharM_Ragged0 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_RaggedElite.SK_CharM_RaggedElite 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Ram.SK_CharM_Ram 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Robo.SK_CharM_Robo 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Shell.SK_CharM_Shell 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_solid.SK_CharM_solid 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Standard.SK_CharM_Standard 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Tusk.SK_CharM_Tusk 
+NPCMeshes=/Game/InfinityBladeWarriors/Character/CompleteCharacters/SK_CharM_Warrior.SK_CharM_Warrior

 

// 생성한 DefaultGameTitle.ini파일을 이용할 수 있음
UCLASS(config=GameTitle)
class GAMETITLE_API AABCharacterNonPlayer : public AABCharacterBase
{
	GENERATED_BODY()
	
public:
	AABCharacterNonPlayer();

protected:
	UPROPERTY(config)
	TArray<FSoftObjectPath> NPCMeshes;
    
	TSharedPtr<FStreamableHandle> NPCMeshHandle;
}


// .cpp
{
	// 비동기 로딩 + 로딩 종료함수 바인딩
	NPCMeshHandle.UAssetManager::Get().GetStreamableManager().RequestAsyncLoad(NPCMeshes[원하는인덱스], ..., &ThisClass::로드종료함수);
}

 

 

애셋 로딩

생성자 로딩

언리얼Path를 통해 애셋 로드, 없으면 nullptr반환

- ConstructorHelpers::FObjectFinder

- ConstructorHelpers::FClassFinder

 

런타임 로딩

UObject* StaticLoadObject( 
	UClass* Class,
	UObject* InOuter,
	const TCHAR* Name,
	const TCHAR* FileName,
	uint32 LoadFlags,
	UPackageMap* Sandbox,
	bool bAllowObjectRecociliation
)

UObject* LoadObjectFromPath(const FName& path)
{
	if( path == NAME_None) return NULL;
		return Cast<UObject>(StaticLoadObject( UObject::StaticClass(), NULL, *path.ToString());
	}
	
    LoadObject<T>(NULL, TEXT("Game/....", NULL, LOAD_None, NULL);
}

Blueprint로딩

TSubclassOf<AActor> SpawnedClass;

FString SpawnedBlueprintReference = TEXT("Blueprint'/Game/FirstPersonCPP/Blueprints/FirstPersonProjectile.FirstPersonProjectile'");
    
UObject* LoadedObject = StaticLoadObject(UObject::StaticClass(), nullptr, *SpawnedBlueprintReference);
    
UBlueprint* CastedBlueprint = Cast<UBlueprint>(LoadedObject);
    
if (CastedBlueprint && CastedBlueprint->GeneratedClass->IsChildOf(AActor::StaticClass()))
{
    SpawnedClass = *CastedBlueprint->GeneratedClass;
}

 

서브오브젝트 얻어오기

// GetDefaultSubobjects사용
TArray<UObject*> Objects;
GetDefaultSubobjects(Objects);

// FActorRange사용
UWorld* World = GetWorld();
FActorRange Range(World);
// TActorIterator사용하여 특정타입만 얻어올 수 있음
// TActorIterator<액터타입> Iter(World);
for (const auto& Actor : Range)
{
    //...
}

 

액터에서 컴포넌트 검색

Actor->FindComponentByClass<U컴포넌트>();