Unreal 4 – C++ notes – third person perspective character design and source code analysis

“This is the 10th day of my participation in the Gwen Challenge in November. Check out the details: The Last Gwen Challenge in 2021.”

Under the source code, no secrets. – Hou Jie

1. Create a C++ project

• Create a C++ class that inherits fromACharacter, namedThirdCharacter

2. Thirdcharacter.h analysis

• Create the camera arm component

UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera, meta = (AllowPrivateAccess = "true"))
	class USpringArmComponent* ArmCamera;
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Can only be read VisibleAnywhere, BlueprintReadOnly blueprint. A type of Camera

• Creating a Camera Component

UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera, meta = (AllowPrivateAccess = "true"))
	class UCameraComponent *FallowCamera;
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• Forward and backward function

UFUNCTION(BlueprintCallable)
		void MoveForward(float Value);
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• Left and right shift function

UFUNCTION(BlueprintCallable)
		void MoveRight(float Value);
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3. Thirdcharacter.cpp analysis

• Set initial radius of capsule to height

GetCapsuleComponent() - >SetCapsuleSize(Radius, Height);
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Note that the default collision judgment is capsule

• Don’t let the input controller control the capsule’s Rotation. Let the input control only affect the camera

bUseControllerRotationPitch = false;
bUseControllerRotationYaw = false;
bUseControllerRotationRoll = false;
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• Set character movement

  • Rotate the character in the specified direction before moving

    GetCharacterMovement()->bOrientRotationToMovement = true;
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  • Set the capsule rotation speed

    GetCharacterMovement()->RotationRate = FRotator(0.0 f.540.0 f.0.0 f);
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  • Jump z-axis height

    GetCharacterMovement()->JumpZVelocity = 450.f;
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  • Air control, the amount of lateral movement control available to the character when falling. 0 = no control, 1 = full control at MaxWalkSpeed’s maximum speed.

    GetCharacterMovement()->AirControl = 0.2 f;
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• Create a camera arm (if there is a collision, pull it towards the player)

  ArmCamera = CreateDefaultSubobject<USpringArmComponent>(TEXT("ArmCamera"));
  ArmCamera->SetupAttachment(RootComponent);
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• Set the distance the camera is behind the character

  ArmCamera->TargetArmLength = 300.0 f;
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• The camera arm rotates based on the controller

  ArmCamera->bUsePawnControlRotation = true;
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• Create a camera

FallowCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("FollowCamera"));
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• Attach the camera to the end of the boom

  FallowCamera->SetupAttachment(ArmCamera, USpringArmComponent::SocketName);
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• The camera does not rotate relative to the arm

  FallowCamera->bUsePawnControlRotation = false;
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• Basic operations such as binding keys

• Jump,IE_Pressed bound to ACharacter::Jump,IE_Released bound to ACharacter::StopJumping

• MoveForward, bound to the AThirdCharacter: : MoveForward

• MoveRight, bound to the AThirdCharacter: : MoveRight

• Turn, is bound to the APawn: : AddControllerYawInput, AThirdCharacter inheritance in ACharacter, ACharacter to APawn inheritance

• LookUp, bound to the APawn: : AddControllerPitchInput, AThirdCharacter inheritance in ACharacter, ACharacter to APawn inheritance

• MoveForward function, I feel the function is to get the current camera Angle, to rotate the X-axis of the character to the current Angle of view X-axis

void AThirdCharacter::MoveForward(float Value)
{
	const FRotator Rotation = Controller->GetControlRotation(a);const FRotator YawRotation(0, Rotation.Yaw, 0);

	// get forward vector
	const FVector Direction = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::X);// I feel that the function is to get the current camera Angle,
																				// Rotate the X-axis of the character to match the X-axis of the current viewing Angle
	AddMovementInput(Direction, Value);
}
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Can you elaborate on the function FRotationMatrix? Welcome to comment

4. Bind keyboard to UE4

5. Set the static mesh of the capsule character skeleton and set the animation

Material for the parakong material, animation blueprint for their own animation design according to the material