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93、collision presets

展示简单碰撞

 如果没有简单碰撞，可以添加

在运行时输入命令show collision能够更好的检测碰撞体

query collision才能检测物体间的碰撞，如果是physics collision，无法实现物体间的碰撞

如果是query collision和physics collision同时勾选，则可以实现物体间的block效果和物体间的物理交互效果（例如人能够踢飞石子）

或者例如对相机阻塞，但是对pawn不阻塞，就能实现暗门效果

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94、overlap events

一个蓝图类下，不同组件可以设置不同的overlap事件，可以用在捡拾物品

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95&96&97、delegates

删除蓝图overlap事件

----Item.h------class USphereComponent;UFUNCTION()
void OnSphereOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);UFUNCTION()
void OnSphereEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex);---------Item.cpp--------
#include "Components/SphereComponent.h"void AItem::BeginPlay()
{Super::BeginPlay();Sphere->OnComponentBeginOverlap.AddDynamic(this, &AItem::OnSphereOverlap);Sphere->OnComponentEndOverlap.AddDynamic(this, &AItem::OnSphereEndOverlap);
}void AItem::OnSphereOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{const FString OtherActorName = OtherActor->GetName();if (GEngine){GEngine->AddOnScreenDebugMessage(1, 30.f, FColor::Red, OtherActorName);}
}void AItem::OnSphereEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex)
{const FString OtherActorName = FString("Ending Overlap with: ") + OtherActor->GetName();if (GEngine){GEngine->AddOnScreenDebugMessage(1, 30.f, FColor::Blue, OtherActorName);}
}