Blueprint component hierarchy is not the same in editor and in scene

Development Programming & Scripting
1

Hello,
I’m struggling with components, So I’ve created an actor class with differents custom component to group up components. From this class, I’ve created a blueprint on which, I’ve had meshComponents into those custom components. The problem is that when I put my blueprint in a scene, All the components I’ve add on the blueprint, magicaly goes under the actor root component.

Here is my Actor class :

UCLASS()
class AEditorGizmo : public AActor
{
	GENERATED_BODY()

public:
	AEditorGizmo();

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
	UEditorGizmoToolComponent* TranslationTool;
	UPROPERTY(EditAnywhere, BlueprintReadWrite)
	UEditorGizmoToolComponent* RotationTool;
	UPROPERTY(EditAnywhere, BlueprintReadWrite)
	UEditorGizmoToolComponent* ScaleTool;
}

AEditorGizmo::AEditorGizmo()
{
	USceneComponent* root = CreateDefaultSubobject<UMeshComponent>("Root");
	RootComponent = root;
	TranslationTool = CreateDefaultSubobject<UEditorGizmoToolComponent>("Translation");
	TranslationTool->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);
	RotationTool = CreateDefaultSubobject<UEditorGizmoToolComponent>("Rotation");
	RotationTool->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);
	ScaleTool = CreateDefaultSubobject<UEditorGizmoToolComponent>("Scale");
	ScaleTool->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);

}

And here is the custom component code

UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
class UEditorGizmoToolComponent : public USceneComponent
{
	GENERATED_BODY()

public:	
	// Sets default values for this component's properties
	UEditorGizmoToolComponent();

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		USceneComponent* XAxis;

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		USceneComponent* YAxis;

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		USceneComponent* ZAxis;
	
};

UEditorGizmoToolComponent::UEditorGizmoToolComponent()
{
	PrimaryComponentTick.bCanEverTick = true;

	FName axisName = FName(*("XAxis" + GetName()));
	XAxis = CreateDefaultSubobject<USceneComponent>(axisName);
	XAxis->AttachToComponent(this, FAttachmentTransformRules::KeepRelativeTransform);
	axisName = FName(*("YAxis" + GetName()));
	YAxis = CreateDefaultSubobject<USceneComponent>(axisName);
	YAxis->AttachToComponent(this, FAttachmentTransformRules::KeepRelativeTransform);
	axisName = FName(*("ZAxis" + GetName()));
	ZAxis = CreateDefaultSubobject<USceneComponent>(axisName);
	ZAxis->AttachToComponent(this, FAttachmentTransformRules::KeepRelativeTransform);

}

In the blueprint editor

271×549 20.5 KB

In the scene hierarchy

289×540 15.2 KB

2

I found a solution !

To correct this behavior, I’ve created X, Y and Z Axis scene component directly in the actor constructor like this :

AEditorGizmo::AEditorGizmo()
{
	USceneComponent* root = CreateDefaultSubobject<USceneComponent>("Root");
	RootComponent = root;
	TranslationTool = CreateDefaultSubobject<UEditorGizmoToolComponent>("Translation");
	TranslationTool->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);
	RotationTool = CreateDefaultSubobject<UEditorGizmoToolComponent>("Rotation");
	RotationTool->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);
	ScaleTool = CreateDefaultSubobject<UEditorGizmoToolComponent>("Scale");
	ScaleTool->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);
	TranslationTool->XAxis = CreateDefaultSubobject<USceneComponent>("XAxisTranslation");
	TranslationTool->XAxis->AttachToComponent(TranslationTool, FAttachmentTransformRules::KeepRelativeTransform);
	TranslationTool->YAxis = CreateDefaultSubobject<USceneComponent>("YAxisTranslation");
	TranslationTool->YAxis->AttachToComponent(TranslationTool, FAttachmentTransformRules::KeepRelativeTransform);
	TranslationTool->ZAxis = CreateDefaultSubobject<USceneComponent>("ZAxisTranslation");
	TranslationTool->ZAxis->AttachToComponent(TranslationTool, FAttachmentTransformRules::KeepRelativeTransform);
	RotationTool->XAxis = CreateDefaultSubobject<USceneComponent>("XAxisRotation");
	RotationTool->XAxis->AttachToComponent(RotationTool, FAttachmentTransformRules::KeepRelativeTransform);
	RotationTool->YAxis = CreateDefaultSubobject<USceneComponent>("YAxisRotation");
	RotationTool->YAxis->AttachToComponent(RotationTool, FAttachmentTransformRules::KeepRelativeTransform);
	RotationTool->ZAxis = CreateDefaultSubobject<USceneComponent>("ZAxisRotation");
	RotationTool->ZAxis->AttachToComponent(RotationTool, FAttachmentTransformRules::KeepRelativeTransform);
	ScaleTool->XAxis = CreateDefaultSubobject<USceneComponent>("XAxisScale");
	ScaleTool->XAxis->AttachToComponent(ScaleTool, FAttachmentTransformRules::KeepRelativeTransform);
	ScaleTool->YAxis = CreateDefaultSubobject<USceneComponent>("YAxisScale");
	ScaleTool->YAxis->AttachToComponent(ScaleTool, FAttachmentTransformRules::KeepRelativeTransform);
	ScaleTool->ZAxis = CreateDefaultSubobject<USceneComponent>("ZAxisScale");
	ScaleTool->ZAxis->AttachToComponent(ScaleTool, FAttachmentTransformRules::KeepRelativeTransform);

}