	Content/PhysMaterials
手部	PhysMat_Hand
腿部	PhysMat_Leg

击中游戏角色身体不同部位造成伤害值不同

2023年12月13日 2024年1月11日

Headshot

回顾打出伤害

有两种伤害:

榴弹爆炸
子弹击中

榴弹爆炸伤害

STUProjectile

在BeginPlay注册委托, 发生碰撞时调用OnProjectileHit
OnProjectileHit中调用ApplyRadialDamage, ApplyRadialDamage调用ApplyRadialDamageWithFalloff
ApplyRadialDamageWithFalloff将爆炸波及者整理, 依次对其调用TakeDamage
```
1Victim->TakeDamage(BaseDamage, DmgEvent, InstigatedByController, DamageCauser);
```

子弹击中伤害

STURifleWeapon

若有击中对象, 对其调用TakeDamage

1DamagedActor->TakeDamage(DamageAmount, FDamageEvent(), GetController(), this);

AActor::TakeDamage

会根据DamageEvent类型造成不同伤害, 有三种:
- 点伤害
- 半径伤害
- 其他类型伤害
目前, 子弹击中伤害为其他类型伤害, 榴弹爆炸伤害为半径伤害; 但计算伤害走的均是其他类型伤害

三种伤害对应委托成员

-
点伤害	AActor::OnTakePointDamage
半径伤害	AActor::OnTakeRadialDamage
其他类型伤害	AActor::OnTakeAnyDamage

只要伤害值不为0, 均会触发OnTakeAnyDamage的回调函数; 处理特定类型伤害, 需注册对应类型委托

子弹击中伤害类型应该为点伤害

点伤害的处理函数形参列表中, 包含击中部位, 即骨骼网格体中骨骼名称

榴弹爆炸伤害类型为半径伤害时

计算伤害逻辑应该注册半径伤害对应委托

迁移受伤逻辑

将OnTakeAnyDamage逻辑移动到ApplyDamage

private

ShootThemUp: Components/STUHealthComponent.h
```
1void ApplyDamage(float Damage, class AController *InstigatedBy);
```
ShootThemUp: Components/STUHealthComponent.cpp
```
 1void USTUHealthComponent::ApplyDamage(float Damage, class AController *InstigatedBy)
 2{
 3    const auto Pawn = Cast<APawn>(GetOwner());
 4    if (!Pawn) return;
 5
 6    const auto AreEnemies = STUUtils::AreEnemies(Pawn->Controller, InstigatedBy);
 7    if (!AreEnemies) return;
 8
 9    if (Damage <= 0.0f || IsDead()) return;
10
11    if (!IsHealthFull())
12    {
13        StopHealTimer();
14    }
15
16    SetHealth(Health - Damage);
17
18    if (IsDead())
19    {
20        UE_LOG(LogTemp, Display, TEXT("character dead"));
21        Killed(InstigatedBy);
22        OnDeath.Broadcast();
23    }
24    else
25    {
26        StartHealTimer();
27    }
28
29    PlayCameraShake();
30}
```
在OnTakeAnyDamage输出伤害数值

ShootThemUp: Components/STUHealthComponent.cpp
```
1void USTUHealthComponent::OnTakeAnyDamage(AActor *DamagedActor, float Damage, const class UDamageType *DamageType,
2                                          class AController *InstigatedBy, AActor *DamageCauser)
3{
4    UE_LOG(LogHealthComponent, Display, TEXT("On any damage: %f"), Damage);
5}
```

API导航

FTakeRadialDamageSignature

半径伤害委托类型定义

1DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_SevenParams( FTakeRadialDamageSignature, AActor, OnTakeRadialDamage, AActor*, DamagedActor, float, Damage, const class UDamageType*, DamageType, FVector, Origin, FHitResult, HitInfo, class AController*, InstigatedBy, AActor*, DamageCauser );

处理函数签名

1void OnTakeRadialDamage(AActor* DamagedActor, float Damage, const class UDamageType* DamageType, FVector Origin, FHitResult HitInfo, class AController* InstigatedBy, AActor* DamageCauser);

FTakePointDamageSignature

点伤害委托类型定义

1DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_NineParams( FTakePointDamageSignature, AActor, OnTakePointDamage, AActor*, DamagedActor, float, Damage, class AController*, InstigatedBy, FVector, HitLocation, class UPrimitiveComponent*, FHitComponent, FName, BoneName, FVector, ShotFromDirection, const class UDamageType*, DamageType, AActor*, DamageCauser );

处理函数签名

1void OnTakePointDamage(AActor* DamagedActor, float Damage, class AController* InstigatedBy, FVector HitLocation, class UPrimitiveComponent* FHitComponent, FName BoneName, FVector ShotFromDirection, const class UDamageType* DamageType, AActor* DamageCauser);

FDamageEvent

多个构造函数

默认构造函数
拷贝构造函数: 传递伤害类型
```
1FDamageEvent(FDamageEvent const& InDamageEvent)
2    : DamageTypeClass(InDamageEvent.DamageTypeClass)
3{ }
```
接受伤害类型的构造函数
```
1explicit FDamageEvent(TSubclassOf<UDamageType> InDamageTypeClass)
2    : DamageTypeClass(InDamageTypeClass)
3{ }
```

FPointDamageEvent::HitInfo

包含击中信息

1/** Describes the trace/location that caused this damage */
2UPROPERTY()
3FHitResult HitInfo;

FHitResult

击中信息

-
PhysMaterial	击中部位材质
BoneName	骨骼网格体骨骼名称

 1/**
 2 * Physical material that was hit.
 3 * @note Must set bReturnPhysicalMaterial on the swept PrimitiveComponent or in the query params for this to be returned.
 4 */
 5UPROPERTY()
 6TWeakObjectPtr<UPhysicalMaterial> PhysMaterial;
 7
 8/** Name of bone we hit (for skeletal meshes). */
 9UPROPERTY()
10FName BoneName;

UPrimitiveComponent::GetBodyInstance

传入骨骼网格体的骨骼名称, 获取骨骼对应身体部位

 1/**
 2 * Returns BodyInstance of the component.
 3 *
 4 * @param BoneName				Used to get body associated with specific bone. NAME_None automatically gets the root most body
 5 * @param bGetWelded				If the component has been welded to another component and bGetWelded is true we return the single welded BodyInstance that is used in the simulation
 6 * @param Index					Index used in Components with multiple body instances
 7 *
 8 * @return		Returns the BodyInstance based on various states (does component have multiple bodies? Is the body welded to another body?)
 9 */
10virtual FBodyInstance* GetBodyInstance(FName BoneName = NAME_None, bool bGetWelded = true, int32 Index = INDEX_NONE) const;

UBodyInstance::GetSimplePhysicalMaterial

返回该部位使用的物理材质

1/** Find the correct PhysicalMaterial for simple geometry on this body */
2UPhysicalMaterial* GetSimplePhysicalMaterial() const;

为榴弹爆炸伤害注册半径伤害委托

添加处理函数

private

ShootThemUp: Components/STUHealthComponent.h
```
1UFUNCTION()
2void OnTakeRadialDamage(AActor* DamagedActor, float Damage, const class UDamageType* DamageType, FVector Origin, FHitResult HitInfo, class AController* InstigatedBy, AActor* DamageCauser);
```
ShootThemUp: Components/STUHealthComponent.cpp
```
1void USTUHealthComponent::OnTakeRadialDamage(AActor* DamagedActor, float Damage, const class UDamageType* DamageType, FVector Origin, FHitResult HitInfo, class AController* InstigatedBy, AActor* DamageCauser)
2{
3    UE_LOG(LogHealthComponent, Display, TEXT("On radial damage: %f"), Damage);
4    ApplyDamage(Damage, InstigatedBy);
5}
```
注册委托处理函数

ShootThemUp: Components/STUHealthComponent.cpp
```
1// BeginPlay
2
3TheOwner->OnTakeRadialDamage.AddDynamic(this, &USTUHealthComponent::OnTakeRadialDamage);
```

为子弹击中伤害注册点伤害委托

传递伤害类型和击中信息

ShootThemUp: Weapon/STURifleWeapon.cpp

1#include "PhysicalMaterials/PhysicalMaterial.h"
2
3// MakeDamage
4
5FPointDamageEvent PointDamageEvent;
6PointDamageEvent.HitInfo = HitResult;
7UE_LOG(LogTemp, Display, TEXT("Rifle hit: bone %s, physical materials %s"), *HitResult.BoneName.ToString(), *HitResult.PhysMaterial->GetName());
8
9DamagedActor->TakeDamage(DamageAmount, PointDamageEvent, GetController(), this);

注册委托

添加属性: 物理材质和伤害值关联

protected

ShootThemUp: Components/STUHealthComponent.h
```
1class UPhysicalMaterial;
2
3UPROPERTY(EditDefaultsOnly, BlueprintReadWrite)
4TMap<UPhysicalMaterial *, float> DamageModifiers;
```
添加接口: 返回伤害系数

private

ShootThemUp: Components/STUHealthComponent.h
```
1float GetPointDamageModifier(AActor *DamageActor, const FName &BoneName);
```
ShootThemUp: Components/STUHealthComponent.cpp
```
 1// #include "GameFramework/Actor.h"
 2// #include "GameFramework/Pawn.h"
 3#include "GameFramework/Character.h"
 4#include "Components/SkeletalMeshComponent.h"
 5#include "PhysicalMaterials/PhysicalMaterial.h"
 6
 7float USTUHealthComponent::GetPointDamageModifier(AActor *DamageActor, const FName &BoneName)
 8{
 9    const auto Character = Cast<ACharacter>(DamageActor);
10    if (!Character || //
11        !Character->GetMesh() || //
12        !Character->GetMesh()->GetBodyInstance(BoneName)) return 1.0f;
13
14    const auto PhysMaterial = Character->GetMesh()->GetBodyInstance(BoneName)->GetSimplePhysicalMaterial();
15
16    if (!PhysMaterial || !DamageModifiers.Contains(PhysMaterial)) return 1.0f;
17
18    UE_LOG(LogHealthComponent, Display, TEXT("Point damage: bone %s, physical materials %s"), *BoneName.ToString(), *PhysMaterial->GetName());
19
20    return DamageModifiers[PhysMaterial];
21}
```
添加处理函数

private

ShootThemUp: Components/STUHealthComponent.h
```
1UFUNCTION()
2void OnTakePointDamage(AActor* DamagedActor, float Damage, class AController* InstigatedBy, FVector HitLocation, class UPrimitiveComponent* FHitComponent, FName BoneName, FVector ShotFromDirection, const class UDamageType* DamageType, AActor* DamageCauser);
```
ShootThemUp: Components/STUHealthComponent.cpp
```
1void USTUHealthComponent::OnTakePointDamage(AActor *DamagedActor, float Damage, class AController *InstigatedBy, FVector HitLocation,
2                                            class UPrimitiveComponent *FHitComponent, FName BoneName, FVector ShotFromDirection,
3                                            const class UDamageType *DamageType, AActor *DamageCauser)
4{
5    const auto FinalDamage = GetPointDamageModifier(DamagedActor, BoneName) * Damage;
6
7    UE_LOG(LogHealthComponent, Display, TEXT("On point damage: %f, final damage %f, bone: %s"), Damage, FinalDamage, *BoneName.ToString());
8    ApplyDamage(FinalDamage, InstigatedBy);
9}
```
注册委托处理函数

ShootThemUp: Components/STUHealthComponent.cpp
```
1// BeginPlay
2
3TheOwner->OnTakePointDamage.AddDynamic(this, &USTUHealthComponent::OnTakePointDamage);
```

调整游戏角色身体物理材质

当前游戏角色身体拥有2种物理材质

	Content/PhysMaterials
头部	PhysMat_Head
身体	PhysMat_Body

新增物理材质

Content/PhysMaterials

手部 PhysMat_Hand

腿部 PhysMat_Leg
应用新增物理材质

HeroTPP_Physics

善用属性拷贝粘贴

	Content/PhysMaterials
手部	PhysMat_Hand
腿部	PhysMat_Leg

查看

为游戏角色设置子弹击中伤害系数

善用属性拷贝粘贴

	伤害系数
头部	百倍伤害, 击杀
身体	1.0
腿部	1.1
手部	0.8

玩家操控的游戏角色
NPC

暂停NPC行为树

BP_STUCharacter
将回合时长设置为300s

BP_STUGameModeBase
日志

依次击中腿部, 手部, 身体, 头部

说明

爆头应该直接导致死亡, 即检测到击中部位物理材质为PhysMat_Head, 直接设置生命值为0

下一篇 NPC感知伤害

上一篇步枪支持瞄准镜变焦

六一的部落格

关关难过关关过，前路漫漫亦灿灿。

回顾打出伤害

榴弹爆炸伤害

子弹击中伤害

AActor::TakeDamage

子弹击中伤害类型应该为点伤害

榴弹爆炸伤害类型为半径伤害时

迁移受伤逻辑

API导航

FTakeRadialDamageSignature

FTakePointDamageSignature

FDamageEvent

FPointDamageEvent::HitInfo

FHitResult

UPrimitiveComponent::GetBodyInstance

UBodyInstance::GetSimplePhysicalMaterial

为榴弹爆炸伤害注册半径伤害委托

为子弹击中伤害注册点伤害委托

传递伤害类型和击中信息

注册委托

调整游戏角色身体物理材质

查看

说明

回顾打出伤害

榴弹爆炸伤害

子弹击中伤害

AActor::TakeDamage

子弹击中伤害类型应该为点伤害

榴弹爆炸伤害类型为半径伤害时

迁移受伤逻辑

API导航

FTakeRadialDamageSignature

FTakePointDamageSignature

FDamageEvent

FPointDamageEvent::HitInfo

FHitResult

UPrimitiveComponent::GetBodyInstance

UBodyInstance::GetSimplePhysicalMaterial

为榴弹爆炸伤害注册半径伤害委托

为子弹击中伤害注册点伤害委托

传递伤害类型和击中信息

注册委托

调整游戏角色身体物理材质

查看

说明