Damaging an Actor from a custom NPC class in Player class when hit by a line trace

Development Programming & Scripting
1

Hi.
I created a simple weapon that fires using line trace. Since there’s no way to detect if an object has been hit with a line trace (if there is let me know) I have to create the damaging system in the player class. I tried this:

    			if (FireHit.Actor->GetClass()->IsChildOf(ANPC::StaticClass()))
    			{
    				ANPC* HitNPC = FireHit.Actor;
    				HitNPC->Damage(10.0f);
    			}

But we cannot just assume that the actor is a child of ANPC class so that doesn’t work.
I honestly have no idea how to do this.

If you know how to help me, then please post an answer to my question.
Thanks!

2

Hey, it looks like you are looking for casts.

You have to do something like the following:

if (FireHit.Actor.IsValid())
{
    ANPC* HitNPC = Cast<ANPC>(FireHit.Actor.Get());
    if(HitNPC)
    {
         HitNPC->Damage(10.0f);
    }
}

Cast “converts” the AActor to your ActorType and you can call your functions on it. If the cast fails it returns a nullptr, so you have to do the nullcheck before using it.

3

Thank you, I actually thought, that cast exists only in blueprints.