U4初步使用整理（三）Actor基本操作

场景中所有可操作的物件都是基于actor，类似unity的game object.

关键方法：

GetActorLocation()

GetActorScale()

Tick做actor每帧逻辑操作

// Called every frame
void AFloatingActor::Tick( float DeltaTime )
{
Super::Tick( DeltaTime );
FVector newPos = GetActorLocation();
float delatMove = FMath::Sin(RunningTime + DeltaTime) - FMath::Sin(DeltaTime);
newPos.Z += delatMove * 3;
SetActorLocation(newPos);

FVector newScale = GetActorScale();
newScale.Z = FMath::Sin(RunningTime + DeltaTime) - FMath::Sin(DeltaTime);
SetActorScale3D(newScale);

RunningTime += DeltaTime;

}

FMath::Sin(RunningTime + DeltaTime) - FMath::Sin(DeltaTime)实现了重力效果运动。