**

一.源代码

**

.h

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "FPSBlackHold.generated.h"

class USphereComponent;
class UStaticMeshComponent;

UCLASS()
class FPSGAME_API AFPSBlackHold : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	AFPSBlackHold();

protected:
	UPROPERTY(VisibleAnywhere, Category = "Components")
	UStaticMeshComponent* MeshComp;

	//内部球体破坏了重叠的组件
	UPROPERTY(VisibleAnywhere, Category = "Components")
	USphereComponent* InnerSphereComponent;//ZX内层球体

	UPROPERTY(VisibleAnywhere, Category = "Components")
		USphereComponent* OuterSphereComponent;//ZX外层球体

	//标记为ufunction绑定到重叠事件
	UFUNCTION()
	void OverlapInnerSphere(UPrimitiveComponent* OverlappedComponent, AActor* OtherAActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);

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

.cpp

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

#include "FPSBlackHold.h"
#include "Components/SphereComponent.h"
#include "Components/StaticMeshComponent.h"


// Sets default values
AFPSBlackHold::AFPSBlackHold()
{
 	// 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;

	MeshComp = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MeshComp"));
	MeshComp->SetCollisionEnabled(ECollisionEnabled::NoCollision);
	RootComponent = MeshComp;

	InnerSphereComponent = CreateDefaultSubobject<USphereComponent>(TEXT("InnerSphereComp"));
	InnerSphereComponent->SetSphereRadius(100);
	InnerSphereComponent->SetupAttachment(MeshComp);

	//绑定重叠事件函数（用于销毁盒体的函数）
	InnerSphereComponent->OnComponentBeginOverlap.AddDynamic(this, &AFPSBlackHold::OverlapInnerSphere);
	
	OuterSphereComponent = CreateDefaultSubobject<USphereComponent>(TEXT("OuterSphereComp"));
	OuterSphereComponent->SetSphereRadius(3000);//覆盖整个关卡的球体
	OuterSphereComponent->SetupAttachment(MeshComp);


}


void AFPSBlackHold::OverlapInnerSphere(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{	//找出重叠的并销毁
	if (OtherActor)
	{
	
		OtherActor->Destroy();
	}
}


// 称每一帧
void AFPSBlackHold::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	//找到所有可能发生碰撞的重叠组件，并可能进行物理模拟
	TArray<UPrimitiveComponent*>OverlappingComps;//ZXprimitive元组件
	       //物理作用力的对象
	OuterSphereComponent->GetOverlappingComponents(OverlappingComps);
	
	for (int32 i = 0; i < OverlappingComps.Num(); i++)
	{
		UPrimitiveComponent* PrimComp = OverlappingComps[i];
		if (PrimComp && PrimComp->IsSimulatingPhysics())
		{
			//我们正在寻找的组件！它需要模拟才能施加外力。
			const float SphereRadius = OuterSphereComponent->GetScaledSphereRadius();
			const float ForceStrength = -2000;//负的价值使它向原点而不是推开
			//作用力强度
			PrimComp->AddRadialForce(GetActorLocation(), SphereRadius, ForceStrength, ERadialImpulseFalloff::RIF_Constant, true);
		     //施加作用力（径向力）
		}
	}

}

二 . BlackHole Material

三 . 导入材质

四 . 为所有Actor勾选Generate Overlap Events 生成重叠事件