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Welcome back, My favorite game developers.

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In this video, we've actually started

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spawning enemies in a smart way.

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So now when we run the game,

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Let's make this bigger so you

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can see properly what's happening.

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The after the candidate finishes,

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the first enemy appears,

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the second enemy appears,

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and they just sit there waiting for us to kill them.

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So once we do kill them,

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Let's try to go them.

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Okay.

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That's actually, oh, okay, that was embarrassing.

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Let's restart the level.

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Wait for that. So we

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made enemies so good that we cannot kill them.

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Okay, So let me try.

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Let me get to a certain distance so we can no longer.

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So once we call them, you can see

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that we have the wave complete.

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And then again, we get the enemy spawning because we've

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made the amount of enemies and here too for this wave.

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So let's not waste any more time and let's get started.

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Oh, case.

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So let's go ahead and actually starts owning enemies.

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The first thing that we're going to do is

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obviously create in here some kind

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of either a co-routine or we can create also a counter.

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But we're going to stick with

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the Coubertin And this courting will be

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called every time we have this spawn delay.

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So this core team will be spawning the enemies.

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Anyways, let's get started and we'll

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see how everything is working.

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So we're going to create an eye enumerator in here.

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And it's going to be called the spawn wave.

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And the wave that we want to actually spawn.

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So wave to spot.

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So we already have the wave that we want to span.

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It will have its own enemies,

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its name, and the amount of enemies it has.

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So we're going to create a for loop.

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In this for loop, we're going to start

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with an integer I equals 0.

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We're going to make sure

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that we never go over the weight to spawn,

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or is it the wave to spawn,

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the amount of enemies?

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And we are also going to be increasing it by

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one every single time.

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So in here we are going to create a random enemy number.

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And it's going to be the random range.

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And this range will be over 0.

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And the wave to spawn enemies dot length.

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So there we go and remember that enemies,

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and here is an array of game objects.

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So we want to spend a random enemy in there.

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So I'm going in here where we'll say

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that some kind of method

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to spawn because we want to have it

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outside the, this right here.

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This will only be the spawn wave.

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This will be the enemy spawner in here.

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And what we'll do,

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and the way this numerator will

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work as we are going to yield

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return new, wait four seconds.

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And it's going to be on the wave.

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Respond. Not delay, dot spawn delay.

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So what's happening in here?

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This is the first time I believe that we

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use the yield return

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inside of a for loop in an enumerator or a coroutine.

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So we go through this loop.

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Every single time we choose a random number,

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we spawned some kind of enemy,

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and then we wait four seconds.

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And then again, we spawned an enemy, we spawned an enemy.

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So this will allow us to

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yield return and call this multiple times,

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this spawned wave several times.

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And after we do this,

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we are going to create also

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the actual method that will spawn the enemy.

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So spawn enemy.

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And in here we're going to say that we will send it

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the game object and the enemy to spawn.

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And in here we're going to say debug dot log just to

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make sure that we know which enemy is

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being spawned and everything is working correctly.

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So spawning the enemy.

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And we're going to give it the enemy to spawn.

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But name.

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There we go. And we are simply coming to instantiate.

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And then she ate the NMI. Too small.

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And it's going to be, oops, excuse me.

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So it's going to be all the transform dot position

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and we transform the row station.

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So what is the transform?

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Which transform are we talking about?

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So because the wave spawner is

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attached to the level manager,

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this will be the position and the rotation

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of the level manager game object in our scene.

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And later on, we will be creating

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several points on which the enemies will be spawning.

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So it will work like that.

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We will have some kind of array.

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We'll deal with that later on that's now

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focused on actually instantiating these enemies.

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So spawn enemy, the wave to

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spawn enemies at the position

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of the random enemy number that we just created.

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So I'm going to add an entering here. What are we doing?

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We need to also call the coroutine and here,

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so before we forget, so co-routine.

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Spawn, spawn, enemies, wave.

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Yep, there we go.

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And which way should we be spawning?

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While in here we're just going to say that it's the wave,

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waves at the position next wave.

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So it's going to be probably

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0 right now because next wave,

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whereas the next wave,

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it starts off at 0 right here.

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So it's going to be the first wave

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that's for just experimenting for now,

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that's focused on what this does.

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So a co-routine which starts if we

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make sure that we are not

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spawning of the countdown is less than 0,

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we are not spawning,

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we are ready to start spawning.

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Then we start the coating in here we have the loop will

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loop through the amount of enemies on

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the wave that we receive.

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As a coroutine, we create a random number.

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We spawn a random enemy which just has the debug

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to tell us which enemy is being spawned

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will probably remove this later on.

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And then we instantiate the actual enemy on the manager.

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And then what happens? We yield return,

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wait four seconds and then spawn in other enemy.

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So before this loop than again is called,

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we have to weigh the spawn delay

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that is designated to us.

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So I'm going to save all of that.

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I'm going to go back and unity.

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And let's see what we have in here as a level manager.

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Wait for this to compile anything.

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Okay, so we go to

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the manager's level manager and what do we have in here?

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I was playing around,

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maybe I did not do this in the video.

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So we have this wave right here.

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It's the skeleton wave.

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The enemies that we have in here are

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the skeleton enemy and the cowardly flying high.

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The amount of enemies we want is to

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and respond lay will be two seconds.

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I'm going to save this.

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Where's the level manager and our world?

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It's not on the 000.

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Let's put it back to 0,

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so it's right in front of our player.

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And let's run the game and see what it looks like.

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So now 12, we should see the wave countdown.

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There we go and whoa,

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that's too much enemies.

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Let's see what we did wrong in here.

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So we save that.

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What's happening in here,

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we are checking the countdown is less than 0.

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Are we not in the spawning state?

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Well, let's see. We start

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off with the counting, so we're not.

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So obviously we need to change our states in here.

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So before we actually create the loop or start the loop,

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we are going to say that we are in

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a state which is equal to

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the spawning States, but spawning.

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And then when we finish spawning,

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we are going to go into a state,

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which is the weighting.

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So we're waiting for the enemies to be spawn.

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So now we start before we actually go through the loop,

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we said the state.

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So now this will not be called every single

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time and we will not have that many enemies.

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Let's again test this out.

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Run the game. We can see the countdown in here.

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I made it public. There we go.

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So 0, we get the enemy and he starts shooting.

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Then we get another enemy,

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and then we gave them another enemy,

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and it's being called every two seconds.

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So look at these little cowers right here.

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This is a really nice cool game mechanic, as you can see,

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every two seconds, 1212, and there we go.

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So as you can see,

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enemies are being called every single second.

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But you now might be wondering,

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why do we have so many enemies,

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even though we said that the amount

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of enemies should be only too.

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Well. It's because in here,

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we don't actually have the wave countdown resetting.

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Again, something that we will deal with later on.

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But let's first of all think of when will we be

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actually resetting the wave and when does an actual wave?

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And so we can either create a time between wave.

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So let's say the first wave and the second wave,

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there is a delay between them.

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Or we can have some really nice mechanic and give

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our layer or the person that's playing our game

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a chance to go ahead and kill all of

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the enemies in this wave before the next wave comes on.

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So this is what we are going to do.

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And to do that, we are going to

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create some kind of method

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that will keep track of whether an enemy has died or not.

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So let's go back down here.

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And after the spawn enemy,

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we are going to create a private.

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There's going to be a Boolean,

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and it's going to be the enemies or alive.

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And this will return true if

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all the enemies are alive or no.

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Oh yes, if all of the enemies are alive and false,

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if one of them or none of them are alive.

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So in here what I'm going to say,

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I'm going to create an if condition.

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And I'm going to have the final object of type.

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And objects of type actually not find objects,

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find up objects of type.

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And the enemy controller,

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I'll be looking for the enemy controller dot length.

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And it's going to be equal to 0.

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And if it is, then we are going to return false.

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So false, that means that all the enemies have died.

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And then if we go through

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this one and we don't return false,

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then we are going to return true.

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That means that the enemies are still alive.

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So now we have a wave

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or of making sure whether our enemies

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have all been depleted and we will be

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able to use it right here as a condition somehow.

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But there is a small problem that is bothering me.

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The find objects of type on

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the enemy controller is actually a very cumbersome,

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let's say operation on the system.

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It takes up a lot of resources every

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time to go through all the objects

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on the enemy controller,

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which is sometimes not very necessary.

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So what do we want to do is we want to have some kind

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of a timer on the enemies are alive checker.

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So we don't actually check

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every single frame if all the enemies are dead.

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But instead, we have this

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being checked every couple of seconds.

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So I'm going to issue it to you as a challenge,

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and your challenge is to delay checking.

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So first of all,

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you'll need to create a variable for

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the time between checking for enemies.

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In the Boolean method makes sure that we don't

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look all the enemies except when the time is done.

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Pay attention to where we should reset this counter.

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So this will be very important.

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So with that said,

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pause the video right now and go do each Shannon.

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Okay, welcome back.

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So I'm going to scroll up in here.

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And I'm going to create a private float.

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The time between enemy search, between enemy search.

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And let's say it's one F.

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So 1 second. Every 1 second we check

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for all of the enemies of the debt.

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And then in here I'm going to say that the time between

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search is being reduced by Time.deltaTime,

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every single frame, and this will

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be called every single frame.

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And then down here,

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I'm going to check before we

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actually check for all the objects.

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If the time between search is less than or equal to 0,

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then we will be searching. There we go.

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And then when do we actually reset this?

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So once the time between

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search is less than or equal to 0,

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we start by checking if all of the enemies have died.

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And we also can go

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ahead and reset this time between searches.

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And I'm going to set it to 1.5 because I don't

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think that this is something

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that you might want to change in the inspector,

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the time between enemy searches,

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this can be pretty standard.

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But if you think that you

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might need to change this variable,

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obviously this one f will not work.

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You need to go up here,

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create a separate variable

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if you did that, congratulations,

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00:14:30,965 --> 00:14:34,975
this is the better step or the better way of thinking,

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the better game design maybe.

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But for me, I believe this

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will be something very constant,

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something that will not change.

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I don't think we will ever have to change

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the time between enemy searches.

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Will that finished?

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Let's go back up in here.

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And we need to make sure that we,

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Where is it in here and update.

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We are going to check

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the state is equal to the spawning states dot waiting.

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So that means we are constantly

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spawning enemies and we are in the waiting.

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So we check after we obviously finished this for loop,

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we check is the state waiting.

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Then if it is in here,

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we are going to check if the enemies are alive.

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And notice that we added this exclamation mark,

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which means the exact opposite.

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So if all of the enemies have Lloyd are going to

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save debug dot log, wave.

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Complete.

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Save that.

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And else, if it's not,

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then we are going to simply return.

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And why are we doing this?

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Why are we saying return?

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00:15:49,610 --> 00:15:52,390
We said that returned means that we don't do

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00:15:52,385 --> 00:15:56,435
anything else inside of the method, especially in update.

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00:15:56,435 --> 00:15:59,335
Why? Because once the wave is complete,

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00:15:59,330 --> 00:16:01,580
we don't want to go back into the wave,

341
00:16:01,580 --> 00:16:04,330
can now check if we are not in spawning,

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00:16:04,325 --> 00:16:05,995
which we will be not n

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00:16:05,990 --> 00:16:08,260
because we are obviously and the waiting

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00:16:08,255 --> 00:16:10,135
and start the recording again and

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00:16:10,130 --> 00:16:12,740
start creating the enemies again.

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00:16:12,740 --> 00:16:14,630
So once the wave is complete,

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00:16:14,630 --> 00:16:18,830
we want to stop the whole update from working.

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00:16:18,830 --> 00:16:20,200
So I'm going to save that.

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00:16:20,195 --> 00:16:22,195
I'm going to go back into my gain.

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00:16:22,190 --> 00:16:26,720
And now we should see that when we run the game.

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00:16:26,720 --> 00:16:31,270
So we get, after five seconds of Countdown,

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00:16:31,265 --> 00:16:32,915
we get the count the enemy.

353
00:16:32,915 --> 00:16:35,995
After two seconds we can another count the enemy.

354
00:16:35,990 --> 00:16:38,030
And there we go.

355
00:16:38,030 --> 00:16:41,000
You can see that we have stopped everything so we

356
00:16:41,000 --> 00:16:44,260
no longer get more enemies that we have to.

357
00:16:44,255 --> 00:16:46,015
So I'm going to try to kill those.

358
00:16:46,010 --> 00:16:47,540
So we have both of them.

359
00:16:47,540 --> 00:16:48,920
And as you can see, again,

360
00:16:48,920 --> 00:16:51,940
the wave has been completed and then the enemies

361
00:16:51,935 --> 00:16:55,375
start spawning again. Okay, great.

362
00:16:55,370 --> 00:16:57,700
So with that out of the way,

363
00:16:57,695 --> 00:16:59,875
make sure to commit your changes.

364
00:16:59,870 --> 00:17:01,790
I hope you enjoy it and I'll see you in

365
00:17:01,790 --> 00:17:03,800
the next video where we'll be

366
00:17:03,800 --> 00:17:06,040
spawning points for multiple waves

367
00:17:06,035 --> 00:17:08,225
and completing all of them,

368
00:17:08,225 --> 00:17:09,385
killing all the enemies,

369
00:17:09,380 --> 00:17:10,820
completing all the way,

370
00:17:10,820 --> 00:17:14,030
and maybe having some kind of really nice message.

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00:17:14,030 --> 00:17:16,230
So see you then.