Implement camera perspective toggle

Source/AgrarianGame/AgrarianGameCharacter.cpp

@@ -43,7 +43,7 @@ AAgrarianGameCharacter::AAgrarianGameCharacter()
 	// Create a camera boom (pulls in towards the player if there is a collision)
 	CameraBoom = CreateDefaultSubobject<USpringArmComponent>(TEXT("CameraBoom"));
 	CameraBoom->SetupAttachment(RootComponent);
-	CameraBoom->TargetArmLength = 400.0f;
+	CameraBoom->TargetArmLength = ThirdPersonCameraDistance;
 	CameraBoom->bUsePawnControlRotation = true;
 
 	// Create a follow camera
@@ -80,6 +80,11 @@ void AAgrarianGameCharacter::SetupPlayerInputComponent(UInputComponent* PlayerIn
 		{
 			EnhancedInputComponent->BindAction(InteractAction, ETriggerEvent::Started, this, &AAgrarianGameCharacter::Interact);
 		}
+
+		if (ToggleCameraAction)
+		{
+			EnhancedInputComponent->BindAction(ToggleCameraAction, ETriggerEvent::Started, this, &AAgrarianGameCharacter::ToggleCameraPerspective);
+		}
 	}
 	else
 	{
@@ -110,6 +115,46 @@ void AAgrarianGameCharacter::Interact()
 	TryInteract();
 }
 
+void AAgrarianGameCharacter::ToggleCameraPerspective()
+{
+	SetFirstPersonCamera(!bFirstPersonCamera);
+}
+
+void AAgrarianGameCharacter::SetFirstPersonCamera(bool bEnableFirstPerson)
+{
+	bFirstPersonCamera = bEnableFirstPerson;
+
+	if (!CameraBoom || !FollowCamera)
+	{
+		return;
+	}
+
+	if (bFirstPersonCamera)
+	{
+		CameraBoom->TargetArmLength = 0.0f;
+		CameraBoom->SocketOffset = FirstPersonCameraOffset;
+		CameraBoom->bDoCollisionTest = false;
+		FollowCamera->bUsePawnControlRotation = false;
+
+		if (GetMesh())
+		{
+			GetMesh()->SetOwnerNoSee(true);
+		}
+	}
+	else
+	{
+		CameraBoom->TargetArmLength = ThirdPersonCameraDistance;
+		CameraBoom->SocketOffset = FVector::ZeroVector;
+		CameraBoom->bDoCollisionTest = true;
+		FollowCamera->bUsePawnControlRotation = false;
+
+		if (GetMesh())
+		{
+			GetMesh()->SetOwnerNoSee(false);
+		}
+	}
+}
+
 void AAgrarianGameCharacter::DoMove(float Right, float Forward)
 {
 	if (GetController() != nullptr)

Source/AgrarianGame/AgrarianGameCharacter.h

@@ -73,10 +73,26 @@ protected:
 	UPROPERTY(EditAnywhere, Category="Input")
 	UInputAction* InteractAction;
 
+	/** Toggle between third-person and first-person camera views. */
+	UPROPERTY(EditAnywhere, Category="Input")
+	UInputAction* ToggleCameraAction;
+
 	/** How far the player can interact with MVP objects. */
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Agrarian|Interaction", meta = (ClampMin = "100"))
 	float InteractionDistance = 450.0f;
 
+	/** Third-person spring arm distance used when returning from first person. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Agrarian|Camera", meta = (ClampMin = "0"))
+	float ThirdPersonCameraDistance = 400.0f;
+
+	/** Local first-person camera offset relative to the capsule root. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Agrarian|Camera")
+	FVector FirstPersonCameraOffset = FVector(0.0f, 0.0f, 72.0f);
+
+	/** True when this local character is using the optional first-person view. */
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Agrarian|Camera", meta = (AllowPrivateAccess = "true"))
+	bool bFirstPersonCamera = false;
+
 public:
 
 	/** Constructor */
@@ -98,6 +114,12 @@ protected:
 	/** Called for interaction input */
 	void Interact();
 
+	/** Called for camera perspective toggle input */
+	void ToggleCameraPerspective();
+
+	/** Applies local camera presentation state. */
+	void SetFirstPersonCamera(bool bEnableFirstPerson);
+
 public:
 
 	/** Handles move inputs from either controls or UI interfaces */
@@ -120,6 +142,10 @@ public:
 	UFUNCTION(BlueprintCallable, Category="Agrarian|Interaction")
 	virtual void TryInteract();
 
+	/** Returns true when this local character is using first-person camera presentation. */
+	UFUNCTION(BlueprintPure, Category="Agrarian|Camera")
+	bool IsFirstPersonCamera() const { return bFirstPersonCamera; }
+
 	/** Server-authoritative interaction entry point. */
 	UFUNCTION(Server, Reliable)
 	void ServerInteract(AActor* TargetActor);
@@ -144,4 +170,3 @@ public:
 	/** Returns BuildingPlacementComponent subobject **/
 	FORCEINLINE UAgrarianBuildingPlacementComponent* GetBuildingPlacementComponent() const { return BuildingPlacementComponent; }
 };
-