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In this lecture, we're going to start adding some audio to our game.

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Before we get into music, though, we're going to start with our explosions and our firing effect.

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Now, the first step to adding any audio into our game is to find something to use.

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So this is going to be your first challenge to find some audio that you like the sound of.

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Here I am on Kenny Nel again, where we got our sprites from and if we add up to assets, Kenny also

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has some audio.

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So if we filter by audio, I'm going to go with the sci fi sounds pack.

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Once you've downloaded your chosen audio, we need to import it into our project and I've placed mine

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under my assets pack and sci fi sound.

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So I've got all of my Kenny sounds in here.

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And now let's think about how we're going to play this audio.

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There are many options for playing audio in unity depending on whether you're using sound effects or

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music and things like that.

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So let's start by looking at playing one shot audio clips, and these are going to be audio clips that

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are instantiated into the world at runtime, exist for the lifetime of the audio clip and then get destroyed

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up in our hierarchy.

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Let's right click and create a new empty game object and let's call this the audio player.

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It doesn't really matter, but let's reset the transforms, keep it tidy.

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And next we're going to add a new script to this.

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So in our scripts folder, let's right click create a new C-sharp script.

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Let's call this the audio player and attach that to our audio player game object.

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With that set up, let's open up that script and see what we need to write.

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Let's start by getting rid of start and update because we're not going to need them for this.

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And I said we were going to play audio clips for when we're firing projectiles and when the enemies

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are firing projectiles at us, and also whenever something takes damage.

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So when that explosion happens, we're going to have a nice explosion effect to go with it to start

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with.

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Let's just go through the shooting effects, though, and then I'll leave the damage effect to you as

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a challenge now, because our audio player is going to be managing multiple different pieces of audio,

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it would make sense to separate up all variables using some headers.

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So first of all, let's add a new header for our shooting.

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And under this header we're going to need two variables.

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We're going to need a serialized filled of type audio clip.

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So the thing we want to play and let's call this the shooting clip and the second variable we want is

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again going to be a serialized filled, but this is going to control the volume of our clip.

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So this is going to be of type float and we'll call it the shooting volume to give it a default value.

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Let's set this to one to start with, which is full volume.

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And because our volume is going to range between zero and one, let's also add a range attribute to

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this so we can say range.

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And then in parentheses we can give it a lower bound of zero F and an upper bound of one F, and this

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attribute will then constrain our value between those bounds.

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This also has another nice benefit of adding a slider to our inspector to make it really easy to use.

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So with our variables set up now, let's create the method that we're going to call from another script

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to play this audio clip because it's going to be called from elsewhere.

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Let's go ahead and make it public, but it's not going to need to return anything.

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And we'll call this method play shooting clip.

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In here.

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The first thing we want to do is check whether our shooting clip has something assigned to it so we

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can say if our shooting clip does not equal null, then we want to go and play this clip.

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And the way we play this audio clip is by saying audio source don't play clip at point.

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So what this method does is takes our audio clip and instantiate it into the world.

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This means we're going to have to give this method some parameters.

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And the first one is the clip we want to play.

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So this is going to be our shooting clip.

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From our tooltip, we can then see the next parameter is going to be a position in world and to make

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the audio as audible as possible, we're going to place it directly in position of the camera.

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We can get the camera's position by saying camera dot main dot transform dot position.

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And finally we want to specify the volume.

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So that is going to be our shooting volume.

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Now this line is very long, so let's break it up and make it easier to read.

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And that is all there is to this method.

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Now we need to work out where we want to call this method from, and we're currently dealing with all

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of our shooting behavior in our shooter script.

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So let's open up our shooter script.

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And in here the first thing we want to do is grab a reference to our audio player.

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So let's say audio player and we'll call it the audio player.

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Let's add an awake method.

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And in this awake method we're going to say audio player equals find object of type audio player.

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Then if we carry on scrolling down our script, we're dealing with all of our firing behavior in this

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routine.

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And this code routine is getting pretty messy.

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So we may want to break this out into multiple smaller methods to make it easier to manage.

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But for now I'm going to leave it as is, but feel free to update yours if you prefer.

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And instead, I'm just going to add another new line in here.

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This line is going to be our audio player dot play shooting clip.

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So with that done, let's save our script and jump into unity to test this out.

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If we check out our audio player, we can see how this header is going to come in useful for separating

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the different clips in our game.

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And we've also got this nice range slider between zero and one.

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Before we can play though, we do need to set up our shooting clip.

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So let's find our audio clips in our folder and I'm going to choose the laser small one for my audio

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clip.

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Now in our game view, if we just extend this over so we can see some of the options we need to make

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sure that mute audio is unselected.

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This can trip you up quite a lot of times, so if you've placed audio in your game and you can't hear

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it, then just make sure that this option is unchecked in the game view.

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With that deselect selected, let's go ahead and hit play and we've got some nice shooting effects.

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Now this isn't too bad as it is, but with all rapid firing projectiles, this could get a little bit

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overwhelming.

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So let's turn it down a tad because otherwise it can get very annoying.

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And I'm going to turn it right way down to around 2.4.

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This seems like a much more reasonable volume and hopefully you can still hear it on your end.

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So let's come out of play mode and we made that change in play mode.

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So let's just reset that to 0.4.

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And now I think it's time for your challenge.

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I want you to go ahead and extend our audio player to play an audio clip in damages taken.

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So when those explosions happen in our game, as a hint, it's a very similar process to playing our

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firing audio clip.

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So you can use all of what we've just done as a reference and have a think about which script is handling

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the damage processing for our game.

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So pause the video now and give that a go.

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Okay.

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Welcome back.

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So let's add our damage audio to our audio player.

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And it's so similar.

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In fact, I'm going to start off by copying and pasting my variables that I've already written and I'm

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going to change my header to be damaged.

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I'm going to change my audio clip to be the damaged clip, and I'm going to change the volume to be

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the damage volume.

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Then we're going to need a method just like our play shooting clip.

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So again, let's just copy and paste this and reuse what we've got.

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We'll call this play damage clip.

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And we now want to say that if our damage clip does not equal null, then our audio source play clip

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point should be playing our damaged clip at the camera's position and we want the damage volume.

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So that's all there is to this side of the script.

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But I'm noticing that these two methods are virtually identical, so it would be quite nice if we could

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simplify this in case we need to add any more audio to our game later on.

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So let's actually write another private method of type void and we're just going to call this play clip.

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And if we look at the similarities that we can draw from both of our currently written methods, the

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things that really change are the clip and the volume.

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So our method can accept these as parameters.

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We need an audio clip and we'll just call this the clip for now and we need a float for the volume.

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Then we can say that if our clip does not equal null.

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Then the first thing I want to do is try and shorten the length of this line of code.

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So I'm actually going to take the camera position as a variable.

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So this is a vector three called camera pause and this is equal to our camera dot main dot transform

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dot position.

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And then we can play our audio by saying audio source play clip at point.

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And we want to play our clip at the camera position at the specified volume.

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With our more generic methods set up.

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Now, we can use this in both of these other helper methods.

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So let's delete everything that's in there and just say Play clip.

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And we want to play our shooting clip at our shooting volume.

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And for the second one, we want to play our clip and we want to play our damage clip at our damage

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volume.

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So a little bit of annoying refactoring out of the way there, but we've now got a much more robust

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solution.

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With that all set, we now have to actually call this play damage clip from somewhere and damage is

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currently being handled entirely within our health script.

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So let's open up our health script at the top of our script.

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Let's grab a reference to our audio player and call this audio player as well.

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In Awake, we can say that our audio player equals find object of type audio player.

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And finally in our on trigger enter when we're taking damage playing our hit effect, let's say that

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our audio player should play our damage clip.

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So let's save this up now and jump into unity to test that all out.

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In our audio player.

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Let's set up a damaged clip and I'm going to go with explosion crunch for.

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And if we once again hit play to test this out.

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We have our shooting sounds and we have a nice explosion sound as well.

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Just like our shooting audio though this may be a tad too loud, but until we get our background audio

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in, I think it's okay to leave it as it is for now and then balance it later on.

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So congratulations on adding the first pieces of audio to your game, and in the next lecture we're

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going to start adding some background music.

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So I'll see you there.