添加头文件

#include "Components/StaticMeshComponent.h"

禁用网格体组件的碰撞效果

MeshComp->SetCollisionEnabled(ECollisionEnabled::NoCollision);

对球体进行自定义设置，将物理效果设置为仅查询（包括追踪轨迹线或重叠事件）

SphereComp->SetCollisionEnabled(ECollisionEnabled::QueryOnly);

将碰撞设置为响应所有通道，并选择忽略

SphereComp->SetCollisionResponseToAllChannels(ECR_Ignore);

启用Pawn响应通道，设置为发生重叠

SphereComp->SetCollisionResponseToChannel(ECC_Pawn, ECR_Overlap);

新建一个粒子系统，并暴露给蓝图，模式为仅编辑器默认

UPROPERTY(EditDefaultsOnly, Category = "Effects")
UParticleSystem* PickupFX;

新建一个播放粒子的函数

void AFPSObjectiveActor::PlayEffects()
{
    UGameplayStatics::SpawnEmitterAtLocation(this, PickupFX, GetActorLocation());
}

重写父类Actor中的NotifyActorBeginOverlap函数

virtual void NotifyActorBeginOverlap(AActor* OtherActor) override;

实现这个函数，通过super关键字来调用父类实现，然后调用PlayEffects()

void AFPSObjectiveActor::NotifyActorBeginOverlap(AActor * OtherActor)
{
    Super::NotifyActorBeginOverlap(OtherActor);
    PlayEffects();
}

在BeginPlay()中同样也调用PlayEffects()

void AFPSObjectiveActor::BeginPlay()
{
    Super::BeginPlay();

    PlayEffects();
}

打开BP_Objective,选择一个粒子特效