UE5 C++（十一）— 碰撞检测

代理绑定BeginOverlap和EndOverlap

首先，创建自定义ActorC++类 MyCustomActor
添加碰撞组件

#include "Components/BoxComponent.h"

public:
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MyScene")
	class UBoxComponent *MyBoxComponent;

AMyCustomActor::AMyCustomActor()
{
	PrimaryActorTick.bCanEverTick = true;
	// 创建组件
	MySceneComponent = CreateDefaultSubobject<USceneComponent>(TEXT("CustomScene"));
	MyMeshComponent = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("CustomStaticMesh"));
	MyBoxComponent = CreateDefaultSubobject<UBoxComponent>(TEXT("CustomBox"));
}

动态绑定BeginOverlap和EndOverlap

public:
	//声明绑定函数
	UFUNCTION()
	void BeginOverlapFunction(UPrimitiveComponent *OverlappedComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult);
	UFUNCTION()
	void EndOverlapFunction(UPrimitiveComponent *OverlappedComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex);

// Called when the game starts or when spawned
void AMyCustomActor::BeginPlay()
{
	Super::BeginPlay();

	MyBoxComponent->OnComponentBeginOverlap.AddDynamic(this, &AMyCustomActor::BeginOverlapFunction);
	MyBoxComponent->OnComponentEndOverlap.AddDynamic(this, &AMyCustomActor::EndOverlapFunction);
}

void AMyCustomActor::BeginOverlapFunction(UPrimitiveComponent *OverlappedComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult)
{
	GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("BeginOverlapFunction ！！")));
}
void AMyCustomActor::EndOverlapFunction(UPrimitiveComponent *OverlappedComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex)
{
	GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("EndOverlapFunction ！！")));
}

编译脚本之后

创建刚才脚本的蓝图类 BP_MyCustomActor 并放到场景中

调整碰撞区域大小

然后，添加第三人称人物，并拖拽到场景中


运行之后，碰到和离开都会打印日志

完整的MyCustomActor脚本
MyCustomActor.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
// 引入组件
#include "Components/SceneComponent.h"
#include "Components/StaticMeshComponent.h"
#include "Components/BoxComponent.h"
#include "Components/AudioComponent.h"
#include "Particles/ParticleSystemComponent.h"
#include "GameFramework/Actor.h"
#include "MyCustomActor.generated.h"

UCLASS()
class DEMO_API AMyCustomActor : public AActor
{
	GENERATED_BODY()

public:
	// Sets default values for this actor's properties
	AMyCustomActor();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:
	// Called every frame
	virtual void Tick(float DeltaTime) override;

	// 自定义组件
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MyScene")
	class USceneComponent *MySceneComponent;
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MyScene")
	class UStaticMeshComponent *MyMeshComponent;
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MyScene")
	class UBoxComponent *MyBoxComponent;
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MyScene")
	class UAudioComponent *MyAudioComponent;
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MyScene")
	class UParticleSystemComponent *MyParticleSystemComponent;

	//声明绑定函数
	UFUNCTION()
	void BeginOverlapFunction(UPrimitiveComponent *OverlappedComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult);
	UFUNCTION()
	void EndOverlapFunction(UPrimitiveComponent *OverlappedComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex);
};

MyCustomActor.cpp

#include "MyCustomActor.h"

// Sets default values
AMyCustomActor::AMyCustomActor()
{
	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	// 创建组件
	MySceneComponent = CreateDefaultSubobject<USceneComponent>(TEXT("CustomScene"));
	MyMeshComponent = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("CustomStaticMesh"));
	MyBoxComponent = CreateDefaultSubobject<UBoxComponent>(TEXT("CustomBox"));
	MyAudioComponent = CreateDefaultSubobject<UAudioComponent>(TEXT("CustomAudio"));
	MyParticleSystemComponent = CreateDefaultSubobject<UParticleSystemComponent>(TEXT("CustomParticleSystem"));

	// 把组件添加到根组件
	RootComponent = MySceneComponent;
	MyMeshComponent->SetupAttachment(MySceneComponent);
	MyBoxComponent->SetupAttachment(MySceneComponent);
	MyAudioComponent->SetupAttachment(MyBoxComponent);
	MyParticleSystemComponent->SetupAttachment(MySceneComponent);
}

// Called when the game starts or when spawned
void AMyCustomActor::BeginPlay()
{
	Super::BeginPlay();

	MyBoxComponent->OnComponentBeginOverlap.AddDynamic(this, &AMyCustomActor::BeginOverlapFunction);
	MyBoxComponent->OnComponentEndOverlap.AddDynamic(this, &AMyCustomActor::EndOverlapFunction);
}

// Called every frame
void AMyCustomActor::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);
}
void AMyCustomActor::BeginOverlapFunction(UPrimitiveComponent *OverlappedComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult &SweepResult)
{
	GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("BeginOverlapFunction ！！")));
}
void AMyCustomActor::EndOverlapFunction(UPrimitiveComponent *OverlappedComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex)
{
	GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("EndOverlapFunction ！！")));
}

Hit事件的代理绑定

以上面同样的方式创建Hit的绑定实现

UFUNCTION()
	void HitFunction(UPrimitiveComponent *HitComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, FVector NormalImpulse, const FHitResult &Hit);

void AMyCustomActor::BeginPlay()
{
	Super::BeginPlay();
	MyBoxComponent->OnComponentHit.AddDynamic(this, &AMyCustomActor::HitFunction);
}
void AMyCustomActor::HitFunction(UPrimitiveComponent *HitComponent, AActor *OtherActor, UPrimitiveComponent *OtherComp, FVector NormalImpulse, const FHitResult &Hit)
{
	GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("HitFunction ！！")));
}

不同的是修改碰撞设置
这个是绑定BeginOverlap和EndOverlap

这个是Hit事件的代理绑定

Hit事件的代理绑定之后运行 ，当人物尝试一直前进碰到锥体时会一直触发事件
不像BeginOverlap和EndOverlap只会触发一次

碰撞设置

官网上有相关参考文档
为静态网格体设置碰撞体积
组件和碰撞

在C++脚本中设置

// Sets default values
AMyCustomActor::AMyCustomActor()
{
	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	// 创建组件
	MySceneComponent = CreateDefaultSubobject<USceneComponent>(TEXT("CustomScene"));
	MyMeshComponent = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("CustomStaticMesh"));
	MyBoxComponent = CreateDefaultSubobject<UBoxComponent>(TEXT("CustomBox"));
	MyAudioComponent = CreateDefaultSubobject<UAudioComponent>(TEXT("CustomAudio"));
	MyParticleSystemComponent = CreateDefaultSubobject<UParticleSystemComponent>(TEXT("CustomParticleSystem"));

	// 把组件添加到根组件
	RootComponent = MySceneComponent;
	MyMeshComponent->SetupAttachment(MySceneComponent);
	MyBoxComponent->SetupAttachment(MySceneComponent);
	MyAudioComponent->SetupAttachment(MyBoxComponent);
	MyParticleSystemComponent->SetupAttachment(MySceneComponent);

/****************************** 设置碰撞 ****************************************/

	//碰撞设置
	MyBoxComponent->SetCollisionEnabled(ECollisionEnabled::NoCollision);
	MyBoxComponent->SetCollisionEnabled(ECollisionEnabled::QueryOnly);
	MyBoxComponent->SetCollisionEnabled(ECollisionEnabled::PhysicsOnly);
	MyBoxComponent->SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics);
	MyBoxComponent->SetCollisionEnabled(ECollisionEnabled::ProbeOnly);
	MyBoxComponent->SetCollisionEnabled(ECollisionEnabled::QueryAndProbe);
	//碰撞对象类型
	MyBoxComponent->SetCollisionObjectType(ECC_WorldStatic);
	MyBoxComponent->SetCollisionObjectType(ECC_WorldDynamic);
	MyBoxComponent->SetCollisionObjectType(ECC_Pawn);
	MyBoxComponent->SetCollisionObjectType(ECC_PhysicsBody);
	MyBoxComponent->SetCollisionObjectType(ECC_Vehicle);
	MyBoxComponent->SetCollisionObjectType(ECC_Destructible);
	//碰撞响应
	MyBoxComponent->SetCollisionResponseToAllChannels(ECR_Block);//对所有通道进行设置，响应为Block，阻挡
	MyBoxComponent->SetCollisionResponseToAllChannels(ECR_Overlap);//对所有通道进行设置，响应为Overlap，重叠
	MyBoxComponent->SetCollisionResponseToAllChannels(ECR_Ignore);//忽略
	MyBoxComponent->SetCollisionResponseToChannel(ECC_Pawn,ECR_Overlap);//对单个通道进行响应
	MyBoxComponent->SetCollisionResponseToChannel(ECC_WorldStatic,ECR_Block);//对单个通道进行响应
	MyBoxComponent->SetCollisionResponseToChannel(ECC_WorldDynamic,ECR_Ignore);//对单个通道进行响应

}