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‫Welcome back.

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‫In this video, we're concerned with playing sounds.

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‫We'd like to play some sounds when we fire the projectile.

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‫When the projectile hits something and when one of our pawns dies.

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‫So let's jump right in.

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‫Now I'm here in the ED, and if I go into the assets folder, we have this audio folder and we have

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‫two different sounds and these will be good for when our projectile hits something.

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‫We'll use the thud and when one of our pawns dies will use the explode audio.

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‫And we can also reuse the thud audio when we're launching a projectile.

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‫Now we'd like our projectile to have two variables representing those sound assets.

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‫Now, down here in the private section, I'm going to add a couple of variables and I'm going to forward

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‫declare this class.

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‫Now, the class I'm going to use is you sound base and that's going to be a pointer.

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‫Now I'm going to call this launch sound.

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‫This is going to represent the sound that we play when we launch a projectile.

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‫Now, you sound base is a class we can use for sounds.

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‫Now if we expose this to blueprints, we can set this using our sound assets that we have in our sounds

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‫folder.

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‫So I'm going to go ahead and give this a U property so we can expose it.

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‫And I'm going to make it edit anywhere and place it in the category of combat.

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‫So it's in there with our other combat variables.

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‫Now I'd like another use sound based variable for when the projectile hits something.

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‫So this will be another U sound based pointer.

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‫And I'm going to call this hit sound and I'm going to give this the same you property as launch sound.

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‫Now notice I'm not forward declaring you sound base for hit sound that's because I've already forward

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‫declared you sound base up here.

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‫So once you've forward declared a type on a line, that type can be used after it in the file.

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‫Now for this reason, some people put their forward declarations all the way up here at the top.

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‫That's another way to do it.

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‫So if I said class, you sound base up here, then this takes care of forward declaration and I can

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‫use the use sound base type anywhere in this file after the forward declaration.

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‫So that's another way to do it.

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‫So just to show you both ways, I'm going to forward declare you sound base up here at the top rather

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‫than forward declaring it down here.

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‫So we now have to use sound base variables on projectile h.

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‫I'd like to add a sound base to the base pawn class and this will be for when the base pawn is destroyed.

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‫So this will be in the private section and I'm going to forward declare it here and it's going to be

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‫a you sound base pointer and I'm going to call this death sound and this is going to get a you property.

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‫I'm going to scroll down so you can see it better you property.

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‫It's going to be added anywhere.

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‫And I'll place this in the category.

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‫Combat.

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‫So now that our base -- and our projectile have used sound base variables, let's go ahead and compile

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‫these and take a look at these variables in Blueprint.

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‫And of course, I get a compilation error because I typed you property a bit too hastily.

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‫That lowercase y should be an uppercase y.

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‫These things are case sensitive, so correcting that typo and compiling again, I now have a successful

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‫compile.

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‫So let's hop back into the editor now here the editor, I'm going to go ahead and open up the actors

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‫folder and BP projectile and I'm going to open full blueprint editor I just prefer to do that.

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‫It makes it easier for me to see where everything is now.

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‫I have the launch sound and the hit sound here and because these are edit anywhere we can select sound

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‫assets from the dropdown and it just shows me the valid options I have.

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‫Now what I'm looking at here is launch sound and I'm going to use the thud audio for this.

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‫Now I'm going to use Thud audio for the hit sound as well.

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‫But I made two variables.

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‫So if you get your hands on more sound effects, you can use a different sound for the launch versus

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‫the hit sound.

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‫So this is set up for you in case you like to do that.

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‫Now that takes care of launch sound and hit sound on the projectile.

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‫So I'm going to compile and save and close out of this.

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‫Next, I'm going to open ponds and open BP pond tank.

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‫And here's my death sound in the combat section.

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‫I'm going to click the dropdown and use explode audio and set death sound to the explode audio sound

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‫asset.

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‫I'm going to compile and save that and close out of BP pond tank and open BP pond turret because we

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‫put this variable on the base pond class which the turret also inherits from.

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‫So I'm going to set death sound to explode audio here as well.

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‫So now we have sound assets and they're stored in variables both in our ponds and on the projectile.

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‫The only thing that's left is to actually play these sounds.

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‫Now you game play statics has another useful function.

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‫It's called play sound at location.

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‫Now we can scroll down and see that it takes quite a number of input parameters, but like most of these

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‫functions there are a number of optional parameters that have default values.

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‫So we can dig into the code to see this.

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‫So I'm going to hop into projectile CP and here and begin play.

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‫I'm going to type you gameplay statics, play sound at location and hit that opening parentheses there

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‫and I'll see that it says one of two.

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‫Now this first version it's showing me takes a world context object.

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‫We know we can pass this in for that.

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‫And next it takes a use sound base.

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‫So we have sound base variables and next it takes an F vector for the location.

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‫Now, if we want to play the sound at the location of the projectile, we can just use get actor location

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‫and the rest of these inputs are optional.

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‫So if you'd like to look into those, take another look at the documentation page for this function

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‫and do some more research.

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‫But we are only concerned with the first three inputs so we know how to play sounds at locations we

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‫can use you.

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‫Gameplay statics play sound at location, which takes a world context object, a sound which we can

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‫use our use sound base for and a location which we can use get actor location for.

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‫So your challenge will be to call play sound at location and play sounds for the various aspects of

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‫our gameplay that needs sounds.

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‫So call you gameplay statics play sound at location in the projectile class first in the on hit function

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‫and use our hit sound variable.

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‫Do this in the if check when we check to see if other actor is valid as well as make sure the other

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‫actor is not this or the owner.

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‫But call it before we destroy the projectile and call play sound at location and begin play for the

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‫projectile and use the launch sound.

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‫That way we'll get the sound played when the projectile gets spawned as well as when the projectile

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‫hits something next.

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‫Go into the base pong class and call play sound at location and handle destruction.

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‫And you're going to use the death sound.

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‫That's the explosion.

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‫So pause the video and add these calls to play sound at location now.

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‫Okay.

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‫So first we're here in Projectile CP and I'm going to go in order of the challenge.

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‫So first I'm going to go down to on hit and play the sound down here.

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‫Now you probably checked to see if the sound was null and if you did, I give you kudos because you're

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‫already getting those good programming habits.

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‫Now, if you didn't, that's okay.

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‫Go ahead and do it.

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‫Now.

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‫We're going to check to see if hit sound is valid before we call the new gameplay statics function.

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‫So it's going to be you.

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‫Gameplay statics play sound at location and we first need a world context object that's going to be

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‫this.

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‫Next we need the hit sound itself and we're going to play this at the actor location.

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‫So get actor location will satisfy that third parameter.

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‫Okay, perfect.

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‫Next, we need to play a sound and begin play.

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‫So let's go back up to begin play.

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‫And for this one, we're going to check to see if the launch sound is valid.

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‫So we're going to say if launch sound you game play statics play sound at location and of course we

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‫need the world context object.

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‫That's this the use sound base is going to be launch sound and we're going to play this at the actor

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‫location.

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‫So get actor location and that takes care of playing the sound and begin play.

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‫So the last thing to do is to play the sound on the base -- class and handle destruction.

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‫And now that we're handling visual and sound effects, we don't need to say to do here because we have

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‫done this.

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‫So first, we're going to check to see if death sound is valid.

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‫If it is, then we can call you gameplay statics play sound at location with the world context object.

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‫That's going to be this the sound base that's going to be death sound and get actor location will satisfy

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‫the location for this death sound.

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‫Ock Awesome.

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‫Let's go ahead and compile our code with a successful compile.

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‫We'll hop back here into the editor and let's play test this.

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‫So I'm going to hit play and wait for the timer.

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‫So in summary, we now have sound.

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‫We're playing a sound for the projectile on hit and on launch, and we're playing a sound for the pawn

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‫on death.

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‫So looking back at our section plan, we see that we've checked off just about every single item here.

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‫We're still on the special effects we got the smoke, the explosions and the sounds.

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‫There's just a few things to do to polish up this game and make sure it's looking and feeling right

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‫before we go ahead and wrap up this section.

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‫So I'll see you in the next video.