(Character) Movement

참고자료

• UE 공식 가이드 : https://docs.unrealengine.com/4.27/ko/InteractiveExperiences/Networking/CharacterMovementComponent/
• 개인블로그 : https://lifeisforu.tistory.com/304
• 영상 : https://www.youtube.com/watch?v=urkLwpnAjO0&list=PLXJlkahwiwPmeABEhjwIALvxRSZkzoQpk

 

 

Character Movement 기본 구조

 

Character Movement 네트워크 구조

Architecture & Example

 

클라이언트 / 서버 파이프라인

• Check or Input Vector ( from controller.h → [Possess Actor or Binded? ] movementComponent.h? )
• Controlled Character Move (State adjust) ( movementComponent.h → [movementComp→UpdatedComponent] collisionComponent(or any component which have Location)]
  • delta Time + input Vector 
  • [Input] Vector → [Output] Acceleration ( temporary )
• Perform Move
  • calc Acceleration → force/Impulse
• Start New Physics
  • calc force/Impulse → velocity → location ( depend on movement Mode )

 Character movement compoent 구성

하위프로퍼티 변경 -> 물리처리 phase에서 movement mode체크 -> 해당 movement mode의 연산식에의해, 상위프로퍼티 산출 -> movement

 

movement mode

• character movement component → movement mode
  • 틱마다 호출 ( movement mode == phys_... )
    • Tick → (root motion, movement, etc...) → StartNewPhysics → <UEnum> MovementMode → Phys{None/Walking 등등}
  • Mode 전환 호출
    • SetMovementMode( movementmode, custom enum )
  • 변환시 처리
    • OnMovementModeChanged
      • prev movement mode를 기반으로 종료되는 mode에 대한 처리
      • 만약 시작될때를 기점으로 하고싶다면, setmovementmode가 호출되는 조건 ( IsClimbing등 별도 변수 )를 기준으로 사용하는 듯

 

 

 

Add Force

void UCharacterMovementComponent::AddForce( FVector Force )
{
    if (HasValidData() && !Force.IsZero())
    {
        if (Mass > SMALL_NUMBER)
        {
            PendingForceToApply += Force / Mass;
        }
        else
        {
            UE_LOG(LogCharacterMovement, Warning, TEXT("Attempt to apply force to zero or negative Mass in CharacterMovement"));
        }
    }
}

 

[Character] BP에서 movementComponent는 root component를 제어함

• ACharacter class에서 할당

ACharacter::ACharacter(const FObjectInitializer& ObjectInitializer)
: Super(ObjectInitializer)
{
    // ...
 
    RootComponent = CapsuleComponent;
 
    // ...
 
    CharacterMovement = CreateDefaultSubobject<UCharacterMovementComponent>(ACharacter::CharacterMovementComponentName);
    if (CharacterMovement)
    {
        CharacterMovement->UpdatedComponent = CapsuleComponent;
        CrouchedEyeHeight = CharacterMovement->CrouchedHalfHeight * 0.80f;
    }
 
    // ...
 
}

 

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