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Welcome back my fellow game developers to a brand new video.

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And as you can see,

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we have now a yellow circle.

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What does this yellow circle do when we run our game?

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You can see that if I go inside the yellow circle,

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nothing happens and just make the enemy speed a little bit less.

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If I go into the red circle as normal,

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he starts chasing us.

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I tried to get away.

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I'm inside the yellow circle,

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but he is still chasing us.

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What is happening?

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The only way to win is to go outside the yellow circle.

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Also, that's how you get away from

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the enemy because he started now it doesn't want to chase you anymore.

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So let's not waste any more time.

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Let's get started.

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And I forgot to tell you that you need to commit your changes at the end.

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Don't forget to do that.

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So let's start k.

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So now we have the enemy knowing

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where the player is based on a certain distance he is from him.

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When the player gets on a certain distance,

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a certain chase range,

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the enemy will know and he will start chasing the player.

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Well, he doesn't do that physically,

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but we can see from the logic and the code that he knows,

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how are we going to do this?

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First thing first, we are going to determine the direction this enemy will be moving in.

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So if the distance is less than the player chase range,

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I'm going to stop the debugging and I'm going to save that the direction to move in,

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it's going to be equal to the player chase range or nonalignment Eclair to chase layer

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to chase dot position minus the transform position.

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So this is just like the formula that we use.

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The 2 the gun and the right direction,

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we choose the position,

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we remove the position of the player to chase.

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We subtract the position of the enemy from

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the player to chase position and that way we get the direction.

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So it's similar to the way we are pointing our gone,

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you can go back and see how that works.

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Now what we're going to do after we know the direction that we're moving in,

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we are going to normalize that direction.

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Because we don't want the enemy to be faster when he moves diagonally.

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So we normalize.

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And then we are going to access the rigid body.

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So the enemy rigid body get the velocity and it's going

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to be equal to the direction to move n times the enemy.

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Speak.

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Save that.

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And now let's go back to our game.

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Let's see how that works.

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I'm going to set the game view next to the scene view so we can see how the range works.

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When we get into range,

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I'm going to run the game.

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So now as I approach the enemy,

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yep, there we go, nothing happens.

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Why is that?

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Well, because we have the small error in here and that the object,

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we don't have a reference to width.

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Why is that?

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Because we are trying to access the enemy rigid body,

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but we haven't set it.

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So the NMI rigid body,

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the dot is equal to the debt component, rigid body 2D.

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There we go.

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Okay, now everything should be working fine.

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Let's stop the game, run it again.

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And now we're getting close. And there you go.

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You can see that the enemy is actually chasing us.

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And obviously we need to fix a couple of things,

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but it is working.

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What happens if we are out of range?

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I'm trying to get out of range.

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Okay. So it doesn't work.

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Let me just first of all,

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well at least it's working.

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It's not perfect, but it's working.

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So let me set this one.

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Let me make the range a little bit smaller because I want to demonstrate something.

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And let's make the speed around too so we can escape.

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I'm going to run the game.

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I'm going to get close to the enemy and then I'm going to stop, I'm runway.

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So as you can see,

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the enemy is still walking and finally he hits a wall.

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So what is the problem in here?

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The problem is that the enemy will still have the momentum with them.

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So I get close, I move away.

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And even if I'm not and the range is still walking mindlessly, now,

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this would be not very bad if he was a zombie,

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but apparently he's a skeleton,

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so he should stop.

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Okay, I should stop though jokes.

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And let's see what we can do.

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So in here, what we should do is when we are in range,

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we are chasing the enemy.

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If we're out of range,

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the direction to move in will be equal to vector 3, 0.

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There we go. That was the direction to move in and vector three,

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okay, Yes, it was. So save that.

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So now when we get out of range,

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we should stop chasing the player.

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So let me know what.

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Let's use a different view, a different layout.

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We can use the two-by-three.

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There you go. This is a nice way also to view the Unity engine.

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So you can see right now change this from three aspects to 19 by 1920 by 1080.

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Now we can see it scene view clearly and the game view clearly.

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We run the game and we get close and to the chase range.

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There we go.

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You can see he keeps chasing us when I'm outside of that range.

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You can see that he immediately stops.

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There you go. You can see as soon as I'm in, he stops.

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When I'm out, he stops chasing.

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Okay, great.

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So what that done?

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I hope you enjoy it.

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Now we can make the chase range a little bit bigger

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because we know if we get far away enough from the enemy.

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There you go.

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You can see he stops chasing girls.

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Now, you can add an extra layer of intelligence to the enemy if you want,

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you can create a stop range.

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For example, let's say we have this range,

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we have another range.

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And if the player,

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if we can get out of that range,

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the second one, then the enemy will stop chasing us.

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And that's going to be actually a challenge for you.

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So how do you like the transitions to the challenge now, there are better, right?

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I got you off guard there, didn't I?

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So I hope create a keep chasing range variable.

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You'll need to draw that range using the gizmos.

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You need to create a boolean is chasing.

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That is true when chasing and false when we're outside the certain range.

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And finally, you will need to create an else if statement that checks if

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we're chasing and we are inside the keep chasing range.

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So I hope you understood the challenge.

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It's a bit hard.

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It will need a bit of configuring,

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but I'm sure that you are up to the challenge.

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So pause the video right now and go to the Shalon case.

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So first thing we're going to do is we're going to create a new variable in here,

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which is going to be the keep chasing.

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And we'll call it the player keep Chase range.

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And then we're create a Boolean.

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And here which we are going to call,

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I'll make it private or know what,

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let's make it public so we can see it and then we'll make it private.

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And public boolean is chasing.

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So the next step,

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what was the next step and the challenge that we see, draw,

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okay, so we're going to draw the circle right here.

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I'm just going to take this and duplicated.

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So Control D as always,

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let's make it yellow.

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And this will be the keep chases range.

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Save that.

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And now what do we have to do next?

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We need to create a Boolean as tracing with that.

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And okay, so when is it true?

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It's true in here when we are inside the range and we start going after the player.

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So is chasing is equal to true.

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Then what happens if we go outside this range?

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The is chasing becomes false.

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But in between, we want to create an if else or else, if.

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Else, if the vector or the distance of the player

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and the enemy is still less than v0, keep Chase range.

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And so this is for, is chasing.

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What we're going to do is we are going to keep the direction as it is.

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There you go.

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Let's save that. Let's look one more time and this code and see if everything works.

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So we've created the range,

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we've made it yellow.

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What happens in here is when the player enters the range of chasing,

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the direction will become the player to chase.

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And then we are going to set the is chasing to true.

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Then we are going to check if the player can get

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outside or if the player is still inside the keep Chase range.

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And we are chasing,

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then we will have the direction to move and still in the player.

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Else.

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If we are outside,

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both the players chase range and they keep Chase range,

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then is chasing is false.

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And what's great about this is if we go inside of the player keep Chase range,

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the enemy will not follow us because it's chasing as false.

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So let's see if that actually works.

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And I'm going to increase the keep Chase range.

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Let's make it.

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Yep, there we go. I think that's good enough.

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I'm going to run the game.

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And now let's see if I walk inside the keep Chase range.

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Nothing happens.

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If I walk inside the chase range,

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the enemy starts chasing.

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If I am, I can actually push him.

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If I am outside the chase range,

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he still follows me.

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What if I go outside both of the ranges?

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He stops following.

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And you can see right here that is chasing is false.

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So he doesn't chase me.

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When is chasing is true?

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He keeps chasing until I go outside the yellow circle.

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So I hope you do the challenge.

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I hope it wasn't too hard.

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I know when I did this challenge,

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I felt that it might be a bit too hard,

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a bit too confusing.

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But I hope you understood what the point of the Boolean was.

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I hope you understood how the else if statements here worked.

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If you didn't re-watch the video,

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I think I explained it well enough,

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so I hope you enjoy it and I'll see you in

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the next video where we will be actually animating our enemy.

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Because as you can see,

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he's very boring currently.

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Until then, have a nice day and I'll see you then.