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‫Hello and welcome.

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‫In this lecture we are going to be fixing those bugs with Raytracing so that we can kill the character.

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‫They aren't killing themselves and we can run over the spot where they've been by disabling their capsule.

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‫Collider Let's dive in and see how to achieve this.

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‫So we've got some weird bugs going on at the moment.

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‫So we've got one where the enemy AI essentially seems to be shooting itself in the face, as you can

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‫see by the fact that it's soon going to sprawl out dead on the floor like so.

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‫But not only that, it carries on shooting as it is dead.

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‫So we're going to solve some of those problems progressively.

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‫Let's see what is going on.

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‫So, first of all, the shooting itself in the face, that could be quite easy to see what's going on.

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‫So if we go over into our gun CP and have a look at how this is working, we're currently doing this

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‫line Trace single by channel to find the hit result and we're doing it starting from the location that

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‫is the player viewport, the viewpoint, sorry.

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‫And with the AI we've already discussed this, it's going to be somewhere around the eye level.

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‫That's where it's going to be tracing from.

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‫And you can see that there might be a little bit of an issue here.

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‫If you start tracing from his eyes, you're going to hit this capsule.

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‫In fact, we have the problem ourselves as well.

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‫The only distinction being that because we have this over the camera view, over the shoulder view,

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‫then the we essentially don't get the issue because we circumvent that capsule and don't hit it.

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‫But we could be hitting our own capsule just as easily if our camera were in a different location.

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‫So how do we stop that?

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‫So if we go back and define this, we'll create a struct, the F collision query parameters, I'm going

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‫to call params and then we can add some actors that should be ignored as part of our line.

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‫Trace We do this by doing params dot add ignore ignored actor and then what are the actors we should

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‫ignore?

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‫Well, the first one is simply the gun.

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‫So this and the second one is the owner --.

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‫So params add ignored actor get owner.

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‫So basically the owner of the gun should not be hit by his own gun.

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‫I mean, obviously, you know, you might want to be able to hit your own pawns with the gun, but then,

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‫no, not in this case.

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‫So the params we are going to pass in as the last argument to our line trace single by channel and then

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‫we're going to save and build and see if this works.

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‫So now ideally if we go and hit play, we should see the yep, we're getting the particle effect on

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‫our capsule, on our player, and eventually our health should go down to zero and we should end up

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‫sprawled out on the floor.

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‫There we go.

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‫Sprawled out on the floor somewhere.

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‫We seem to have fallen through.

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‫I don't know where our actual player has gone, but we are still spawned on the floor.

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‫But here is another bug.

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‫You can see that he's still shooting at us and he's still shooting and hitting a capsule.

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‫And the same thing actually happens.

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‫If I were to kill this guy, let's go ahead and kill him.

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‫There you go.

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‫Getting the there.

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‫It's much harder without something to point at on the screen.

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‫But you're able to get him.

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‫But he's still shooting still shooting at me.

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‫And what we would have also seen is that his capsule is still active.

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‫So there's a couple of things we want to do when our characters get killed, both the AI and the player.

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‫So let's go to the shooter character CP and let's find our take damage function.

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‫And we basically want to add an if statement in here.

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‫We want to say if is dead.

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‫So basically we've taken damage for the last time.

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‫We're now dead.

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‫We need to do some stuff.

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‫We need to do some cleanup.

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‫The first thing we need to do is detach the controller from this character.

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‫The controller is no longer in charge of this character.

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‫The character is dead.

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‫You can't do anything that's going to stop us from being able to shoot.

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‫So the AI will no longer be shooting when it's dead.

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‫That sort of makes sense.

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‫And furthermore, we're no longer going to be able to try and move around in the world.

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‫All of that is being disabled by doing a detach from controller pending destroy.

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‫That's what we're going to do.

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‫Then the next thing is we want to switch off that capsule collision.

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‫So we're going to do the get capsule component and then we're going to need to do a hash include up

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‫at the top.

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‫For the capsule component.

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‫So how to include components and the capsule component over there?

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‫Then scroll back down to our take damage.

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‫I'm going to do an arrow operator and we're going to do a set collision enabled.

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‫So we kind of want to set it not enabled.

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‫That's why we're doing a set collision enabled, weirdly enough.

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‫So it's going to be E collision enabled, colon, colon, no collision.

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‫So we're setting our capsule collider to no collision, which should help us right out.

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‫Okay.

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‫So we're going to go ahead and build and see if that's helped.

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‫Well, the compile at least was successful.

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‫Let's go and hit play.

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‫And so he's shooting at me.

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‫I can shoot him till he's dead.

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‫There we go.

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‫He's dead.

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‫I can go over his capsule and I'm no longer colliding with it.

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‫You can also see that he is no longer shooting his gun, which is fantastic.

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‫And let's also see if he goes and kills us.

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‫What's the behavior?

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‫So we just have to wait for the ten shots.

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‫And you can see I sprawl out dead just as much as he did and he keeps shooting at me.

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‫That's okay.

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‫He's no longer hitting an empty collider, and I can no longer control my camera because I am dead.

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‫Awesome.

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‫So we've got the basics of a first person shooter here.

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‫We've got an enemy that follows us, shoots at us, we can shoot at it.

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‫Both of us have health.

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‫Both of us can die.

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‫So the next thing is to actually set up some game end conditions so that we can display a nice message

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‫to our player saying that you've lost or that you've won if you killed all of the players in the level.

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‫And that will be the subject of the next lecture.

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‫So you there.