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‫Hey.

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‫Welcome back.

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‫We're ready to finish our game, which means there are just a few things left to do to polish up our

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‫game and get it in a state that we are happy with.

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‫So get ready to finish this game up.

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‫We're almost done.

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‫We're just going to add a couple of features.

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‫I'd like to make the camera movement a little smoother, so we're going to start with that.

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‫I've also noticed that the towers still fire projectiles after the tank has died, so we can make an

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‫easy fix to the code to prevent that from happening.

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‫And also, I'm going to visit a potential issue with the projectile spawn point.

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‫So let's jump in and polish up this game.

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‫Now, the first thing I'd like to look at is the camera movement.

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‫So if I go ahead and hit play, I'll just show you what I mean.

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‫As I move around, you'll see that the camera follows exactly with our movement as we turn and as we

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‫move forward and backward, the camera just sort of automatically follows along.

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‫Now, there's a nice trick we can add to this camera that can make it a little bit smoother.

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‫Let's go ahead and open up BP pond tank.

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‫Now here in BP Pond Tank, I'm going to select our spring arm component.

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‫And if I search for camera lag, I'll see here in the lag section, there's this checkbox enable camera

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‫lag.

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‫I'm going to check that and enable camera rotation lag.

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‫I'm going to check that as well.

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‫Now, this allows us to have the camera lag behind and smoothly catch up, which creates a nice sort

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‫of professional camera effect.

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‫Let's go ahead and hit play and test this out.

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‫So notice as I move, the camera takes a short amount of time to sort of catch up as we're moving.

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‫And the same goes for when we're rotating.

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‫So it's like there's a bit of inertia and the camera is on some sort of sliding track and it slows to

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‫a stop.

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‫Now we can select the spring arm and we can change the camera lag speed and rotation lag speed.

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‫So, for example, if I place this at a smaller value, say five and five rather than ten, now let's

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‫take a look at how it looks.

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‫So I'm moving and you'll see that the camera has a bit more lag.

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‫Now, we can increase or decrease this as we see fit.

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‫This is something that you can experiment with and sort of find the values that work for you.

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‫Here we have a value of two and for me that's a little bit too much lag.

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‫So I think something between five and two would work for me.

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‫If you like this sort of value, then maybe you'll keep it at two or maybe even lower.

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‫But I'm going to put this at a value of, say, four for the camera lag speed and four for camera rotation

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‫lag speed.

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‫Let's take a look at how that looks.

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‫So as I move, the camera lags.

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‫There's clearly some camera lag, but it's not too much.

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‫I think this actually looks pretty good, so I'm pretty satisfied with that.

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‫Our next item is the tower firing after the tank has already died.

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‫Let me just go ahead and show you what I mean.

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‫There we go.

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‫The tank has died and the towers are still firing.

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‫Now, this is because the tank still exists.

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‫And as long as it's in fire range, the towers will continue to fire.

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‫This is easily handled by having a sort of variable that we can check to see if the tank has died.

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‫So I'm going to go into the tank class here and tank, and I'm going to add a Boolean variable that

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‫we can check to see if the tank is still alive.

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‫And I'm going to make this public since we plan on accessing it from outside the class.

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‫So I'm going to make this a bull variable called Be Alive, and I'm going to set it equal to true by

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‫default.

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‫So the tank will start off in the alive state and then as the tank dies, alive will be set to false.

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‫And that can happen in tank CP in handle destruction.

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‫So let's go to handle destruction here.

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‫And after we've set these other properties, I'm going to set B alive equal to false.

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‫So since we're setting B alive to false, we can know if the tank has died and then we can simply prevent

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‫firing the projectiles by checking this boolean.

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‫So let's go into Tower Dot, CP and here in check fire condition.

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‫We can make sure that the tank is still alive before we fire.

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‫So first I'm going to see if tank is valid.

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‫I'm going to say if tank is equal to null pointer, then I'll simply return early.

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‫That way we know Tank will be valid and then in our check to see if we're in fire range, I'm going

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‫to add an and and see if Tank be alive.

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‫If tank.

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‫Is alive, then we can fire.

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‫If Tank is not alive, we will not fire.

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‫Now, you may be wondering whether or not it's a good idea to put the return on a single line like you've

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‫seen me do in previous videos.

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‫And this is a good opportunity to discuss Unreal Engines, best programming practices, and recommendations.

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‫Unreal engine coding practices do recommend that you have curly braces with a body for all of your if

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‫statements, even those that have a single statement.

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‫And the reason is because if you plan on adding multiple lines of code to this, then you already have

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‫the body here.

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‫And it's also more clear.

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‫And that also brings me to another point, which is my use of auto.

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‫I used auto here in the projectile class a couple of times, and while this can be efficient, it's

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‫not as obvious what the types are at first glance, which is why the use of auto is also not recommended

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‫in unreal engine coding practices.

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‫If you want to stick to Unreal Engine recommended coding practices, you can replace these instances

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‫of auto with the actual type.

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‫For example, here, get instigator controller returns an A controller so we can change that to a controller

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‫and that's a pointer.

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‫This you damage type static class returns a U class so we could use you class here and of course get

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‫owner up here returns an a actor so we could use a actor instead of auto here and now if you look at

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‫this code, it's a lot more obvious what these types are, whereas auto just sort of masks everything

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‫and allows you to be lazy and get away with not typing the types.

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‫Now sometimes I'm not sure what a big expression returns, so I'll use auto just to see what that type

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‫is and then later I'll replace it with the actual type.

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‫So that's another way you can use auto to help you learn the types return by long, complicated expressions

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‫like this.

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‫So since we're in the polishing up stages, I'm going to replace auto with the actual type names here

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‫in projectile.

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‫I'm also going to go into base pawn in the fire function where we have this projectile and this is returned

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‫from this big long expression here.

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‫Spawn actor is going to return an a projectile in this case so I can replace this with a projectile.

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‫Okay.

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‫So that's going to polish up the code on the C++ side.

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‫Let's go ahead and compile this.

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‫And with a successful compile, let's hop back into the editor and we're going to hit play and let's

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‫just make sure that those towers stop shooting at us after we've died.

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‫So there's one hit.

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‫There's another one, and I'm waiting, and I don't see any more projectiles.

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‫Perfect.

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‫Okay.

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‫So the last point I'd like to cover before we wrap this up is the projectile spawn point.

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‫Now, let's select that here in BP Pond Tank and make sure that it's spaced far enough away from the

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‫barrel.

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‫Before we do that, I'm going to place it really, really close and show you some issues that could

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‫potentially arise.

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‫Now, as I'm moving forward and clicking the left mouse button, you'll see that I don't see the projectile.

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‫In fact, I don't see it at all because it's just too close.

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‫We're already getting a collision.

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‫It's being destroyed before it can do anything.

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‫So make sure that it's a good deal away from the barrel.

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‫We're spawning some smoke anyway, so it's going to look like a smoke trail is following behind it.

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‫So this will still look pretty realistic.

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‫So that looks pretty good.

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‫And while we're on projectile spawn points, it might be a good idea to go and look at the BP pond turret

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‫and select its projectile spawn point.

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‫And if you've had any issues spawning projectiles from the turret, you might want to make sure it's

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‫a good distance away from the barrel of the turret as well.

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‫So there we have it.

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‫We have a functional game and it looks fantastic.

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‫We have the ability to roll around in the world, we have the ability to shoot projectiles and they

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‫blow stuff up.

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‫If we hit a tower, we can destroy it.

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‫If the tower hits us, it can destroy us.

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‫Just like that.

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‫And we have winning and losing conditions with HUD widgets that display on the screen and tell us whether

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‫we've won or lost the game.

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‫So this is fantastic.

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‫And if you would like to package this game, you can easily do so by going up to the top and clicking

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‫on the platforms icon either for Windows, if you're on a Windows machine or for iOS, if you're using

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‫a mac machine, then of course you have these other options.

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‫If you'd like to package for other platforms, I recommend you do some research online to look up the

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‫different platforms and how to package for them.

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‫I'm on a Windows Machine so I can simply click package project for Windows here and it's going to ask

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‫me where I'd like to package my game.

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‫Now I have my project here in Tune Tanks.

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‫I'm going to right click, create a new folder and I'm simply going to call this build.

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‫That's typically where you would put a packaged project.

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‫So I'm going to select that folder and allow Unreal Engine to package up my game.

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‫It's probably going to take a few minutes and once it's done, I should have a packaged game.

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‫Okay.

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‫So once I've finished packaging we should see build successful in the output log and then we can look

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‫in the folder that we designated for our packaged project.

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‫For me, it's going to be this build folder.

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‫Now I packaged four windows, so I have a Windows folder and here is my tune tanks, dot xy.

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‫It's an executable.

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‫I can double click on it and here is my final project.

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‫I can shoot.

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‫I can dodge.

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‫Looks like my enemy towers can shoot at me and I can destroy them.

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‫Yes, I can destroy them.

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‫They can destroy me, it looks like, and I can lose the game.

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‫And of course, if I was a bit more skilled, I could win the game.

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‫And for your final challenge, I'm going to task you with adding your own flavor to the game.

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‫Make this game your own.

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‫Find some new sounds or effects or meshes and create some funky looking towers and tanks.

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‫Add more towers, maybe add different skill levels, make the towers harder and harder as you progress

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‫throughout your level.

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‫Maybe level up the tank, give it a level that you can increase as you destroy more and more towers.

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‫Maybe you can add new level geometry and make the tank climb up ramps and try to destroy tanks in hard

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‫to reach areas.

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‫The possibilities are endless, but most importantly, have fun.

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‫While you're developing your games.

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‫You're not going to pause the video for this challenge.

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‫This is going to be something that you can do from this point forward with your game projects.

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‫So congratulations.

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‫We finished our game.

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‫I hope you enjoyed this section.

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‫I had a ton of fun.

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‫This is a great game project and you've come a long way.

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‫You've learned a ton of skills throughout this section of the course, so I hope you're ready to move

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‫on to more exciting things.

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‫Thank you very much.

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‫I'm Steven and I'll see you soon.