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11 Weapon and IK Retargeter

090 The Weapon Class

基于 Item 类创建 C++ 文件 Items/Weapons/Weapon.cpp

Item.h
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class SLASH_API AItem : public AActor
{
protected:
    UFUNCTION()
    virtual void OnSphereOverlap(
        UPrimitiveComponent* OverlappedComponent, 
        AActor* OtherActor, 
        UPrimitiveComponent* OtherComp, 
        int32 OtherBodyIndex, 
        bool bFromSweep, 
        const FHitResult& SweepResult
    );
    UFUNCTION()
    virtual void OnSphereEndOverlap(
        UPrimitiveComponent* OverlappedComponent, 
        AActor* OtherActor, 
        UPrimitiveComponent* OtherComp, 
        int32 OtherBodyIndex
    );
};
Weapon.h
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class SLASH_API AWeapon : public AItem
{
    GENERATED_BODY()

protected:
    virtual void OnSphereOverlap(
        UPrimitiveComponent* OverlappedComponent, 
        AActor* OtherActor, 
        UPrimitiveComponent* OtherComp, 
        int32 OtherBodyIndex, 
        bool bFromSweep, 
        const FHitResult& SweepResult
    ) override;

    virtual void OnSphereEndOverlap(
        UPrimitiveComponent* OverlappedComponent, 
        AActor* OtherActor, 
        UPrimitiveComponent* OtherComp, 
        int32 OtherBodyIndex
    ) override;
};
Weapon.cpp
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void AWeapon::OnSphereOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,
    UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
    Super::OnSphereOverlap(OverlappedComponent, OtherActor, OtherComp, OtherBodyIndex, bFromSweep, SweepResult);
}

void AWeapon::OnSphereEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,
    UPrimitiveComponent* OtherComp, int32 OtherBodyIndex)
{
    Super::OnSphereEndOverlap(OverlappedComponent, OtherActor, OtherComp, OtherBodyIndex);
}

091 Sockets

092 Downloading Animations

可以从 Mixamo 上下载

093 IK Rig

创建 IK 绑定文件 IK_XBot，给 XBot 创建骨骼链的重定向

创建 IK 绑定文件 IK_Echo，给 Echo 创建骨骼链的重定向

094 IK Retargeter

095 Attaching the Sword

Item.h
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class SLASH_API AItem : public AActor
{
protected:
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly)
    TObjectPtr<UStaticMeshComponent> ItemMesh;
};
Weapon.cpp
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void AWeapon::OnSphereOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,
                              UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
    Super::OnSphereOverlap(OverlappedComponent, OtherActor, OtherComp, OtherBodyIndex, bFromSweep, SweepResult);

    ASlashCharacter* SlashCharacter = Cast<ASlashCharacter>(OtherActor);
    if (SlashCharacter)
    {
        FAttachmentTransformRules TransformRules(EAttachmentRule::SnapToTarget, true);
        ItemMesh->AttachToComponent(SlashCharacter->GetMesh(), TransformRules, FName("RightHandSocket"));
    }
}

096 Picking Up Items

Item.cpp
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void AItem::OnSphereOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,
    UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
    ASlashCharacter* SlashCharacter = Cast<ASlashCharacter>(OtherActor);
    if (SlashCharacter)
    {
        SlashCharacter->SetOverlappingItem(this);
    }
}

void AItem::OnSphereEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,
    UPrimitiveComponent* OtherComp, int32 OtherBodyIndex)
{
    ASlashCharacter* SlashCharacter = Cast<ASlashCharacter>(OtherActor);
    if (SlashCharacter)
    {
        SlashCharacter->SetOverlappingItem(nullptr);
    }
}
SlashCharacter.h
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class SLASH_API ASlashCharacter : public ACharacter
{
public:
    FORCEINLINE void SetOverlappingItem(AItem* Item) { OverlappingItem = Item; }

protected:
    UPROPERTY(EditDefaultsOnly, Category = "CInput")
    TObjectPtr<UInputAction> EquipAction;

    void Equip(const FInputActionValue& Value);

private:
    UPROPERTY(VisibleInstanceOnly)
    TObjectPtr<AItem> OverlappingItem;
};
SlashCharacter.cpp
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void ASlashCharacter::Equip(const FInputActionValue& Value)
{
    AWeapon* OverlappingWeapon = Cast<AWeapon>(OverlappingItem);
    if (OverlappingWeapon)
    {
        OverlappingWeapon->Equip(GetMesh(), FName("RightHandSocket"));
    }
}

void ASlashCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);

    if (UEnhancedInputComponent* EnhancedInputComponent= CastChecked<UEnhancedInputComponent>(PlayerInputComponent))
    {
        EnhancedInputComponent->BindAction(EquipAction, ETriggerEvent::Triggered, this, &ASlashCharacter::Equip);
    }
}
Weapon.h
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class SLASH_API AWeapon : public AItem
{
public:
    void Equip(USceneComponent* InParent, FName InSocketName);
};
Weapon.cpp
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void AWeapon::Equip(USceneComponent* InParent, FName InSocketName)
{
    FAttachmentTransformRules TransformRules(EAttachmentRule::SnapToTarget, true);
    ItemMesh->AttachToComponent(InParent, TransformRules, InSocketName);
}

097 Enum for Character State

CharacterTypes.h
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UENUM(BlueprintType)
enum class ECharacterState : uint8
{
    ECS_Unequipped UMETA(DisplayName = "Unequipped"),
    ECS_EquippedOneHandedWeapon UMETA(DisplayName = "Equipped One-Handed Weapon"),
    ECS_EquippedTwoHandedWeapon UMETA(DisplayName = "Equipped Two-Handed Weapon")
};
SlashCharacter.h
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class SLASH_API ASlashCharacter : public ACharacter
{
public:
    FORCEINLINE void SetOverlappingItem(AItem* Item) { OverlappingItem = Item; }
    FORCEINLINE ECharacterState GetCharacterState() const { return CharacterState; }
}
SlashAnimInstance.h
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class SLASH_API USlashAnimInstance : public UAnimInstance
{
public:
    ECharacterState CharacterState;
};
SlashAnimInstance.cpp
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void USlashAnimInstance::NativeUpdateAnimation(float DeltaTime)
{
    Super::NativeUpdateAnimation(DeltaTime);

    if (SlashCharacterMovement)
    {
        GroundSpeed = UKismetMathLibrary::VSizeXY(SlashCharacterMovement->Velocity);
        bIsFalling = SlashCharacterMovement->IsFalling();
        CharacterState = SlashCharacter->GetCharacterState();
    }
}

098 Switching Animation Poses

Img 1

099 Equipped Animations

100 Multiple Animation Blueprints

ABP_Echo

Img 2

ABP_EchoMainStates

Img 3

ABP_EchoIK

Img 4

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