WEBVTT

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Game Advanced
Prototype 3

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GCC Academy

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Hello

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I am Youngho Lee, and I am in charge of the shooting game production course

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In this unit, we will learn about prototype 3

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The learning content is about making bullet movement

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making bullet firing

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and making enemy movement

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Making Bullet Movement

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Let's create a bullet movement

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First, let's create bullets

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and then implement the shape of the bullets flying

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Let's go to Unity

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and create a bullet game object first

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In the hierarchy, press +

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and click Cube in 3D Object

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Let's put Bullet in the name

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Let's put Bullet

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and press Reset in Transform for the position

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It's here

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and I'll make the size smaller

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than the player

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I'll put it like this

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And since this bullet actually needs to move

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so, let's create a script

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In the Project window, in the Scripts folder

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press + and put C# Script

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Let's put Bullet in the name

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Once the Bullet script is created

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drag and drop it onto the Bullet game object

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like this

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Now, let's define

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this bullet's roles in the script

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What does this bullet want to do?

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It's going to keep moving upward

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That's what the bullet does

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So, this bullet

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This bullet class itself

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is made up of properties or functions

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What properties are needed

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to perform this sentence?

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In the end, you'll need to keep

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asking the planner

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What information is needed when you try to implement this

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in this sentence?

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That's what you can talk about with the necessary properties

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At this point, you might need the movement speed

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You need to tell us the movement speed

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so that we can move according to the planner's intention

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And we've set the movement speed

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but it would be good if the planner

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could directly modify this part

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Okay, so for the movement speed

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let's put public float speed here

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and set it to 10

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The player moved at a speed of 5, right?

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If you go to PlayerMove

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you can see it's moving at a speed 5

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But what about Bullet?

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I'll process it to move at 10

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And since this guy wants to keep moving upward

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we need to

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implement this in either

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Start or Update

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Since this content needs to keep moving

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we'll need to put it in Update

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Then, let's break this sentence down

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into a little more detail

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What is this sentence ultimately trying to do?

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It wants to move

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To move, you need something

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That is, you need a direction

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In other words, you need to find a direction

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to move in that direction

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If you look at the priorities

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this is how the priorities should be

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Find the direction first, and then move in that direction

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Here, what can we see

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as the direction?

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Let's put direction in Vector3

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dir

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This would be Up in Vector3

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The movement formula is P=P0+vt

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It's like this

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So let's put it in like this

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As we did before, what happens to P0?

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The position of the transform is P0

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Next, vt is dir times

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the size and we'll put in Speed

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which is the property

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Then, if you do * Time.deltaTime

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you'll get vt, right?

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And if you put this value of P=P0+vt in Vector3

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and finally put it in the position of the transform

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the content will be complete

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You can break it down like this and write it

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but if you write it as one sentence, it's like this: P0

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Then + vt, you can write it like this

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If you combine these sentences into one, it'll be the same

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This much will be P0 and vt

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So you can see that this sentence and this sentence are the same

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Let's save it and check it

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Bullet already has a Bullet (Script) attached to it

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When you press the play button

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this Bullet will fly up

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Here, there is something we need to differentiate

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Speed ​​is currently exposed in Bullet

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Player doesn't

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In other words, if the planner wants to modify

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these values continuously

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Player has to ask the programmer

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to modify this number

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Then, the Player has to keep

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modifying this number while working

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This is a very bad way

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It would be better to allow the planner

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to modify his components

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So, I think it would be good to make this number

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5 like Bullet in Player

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and use this speed value like this

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How did I do that?

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I added a property called

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public float speed to PlayerMove

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I processed this property value speed variable

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to be used in vt

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Then, when we save and go

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Player's speed 5 is exposed like this

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So we can change this value

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This way, the planner can modify it easily

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I showed you how to do this

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without asking the programmer

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Bullet is also exposed like this

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 So when you play, the bullet goes up

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the Player moves according to the speed

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and this part becomes the motion

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Making a Bullet Launcher

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This time, let's try firing a bullet

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If you pull the trigger

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these processes will occur

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If you look at it, you will pull the trigger like this

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Then, there are two ways

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As seen on this screen, first

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I'll call the bullet factory

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You will place an order at the factory

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So you will receive the bullet

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and fire it

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The second is that the bullet will come out like this

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but even if you look at this bullet, there are a lot of bullets in the magazine

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So, the structure is to

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take bullets from the magazine and fire them bang bang bang

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every time you pull the trigger

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The second is to fire bullets from the magazine

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Of course, we will fire bullets from the magazine

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but the bullets in the magazine

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have to be produced from the bullet factory here

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In actual practice, this structure

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is used in which the factory directly produces bullets

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Here, practice is what we are talking about in the game

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Here, we will look at some information related to the factory

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Later on, we will try putting bullets

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in the magazine

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It's a little ignorant, but we're going to do this

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every time we pull the trigger

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When we pull the trigger, we will call the bullet factory

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At this time, this factory is smoking

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but stopped, and at this time

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Mr. Kim is sleeping on a cot

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Mr. Kim is sleeping here

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Ring ring ring

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Then Mr. Kim has to jump out of his sleep

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So he says, "Hello!" and answers the phone

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Then I say urgently

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I'll call him Mr. Kim

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Hey, Mr. Kim, I just pulled the trigger

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so make me a bullet quickly

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Then Mr. Kim says, "Okay, I understand,"

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and immediately lowers the lever and starts the factory

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Then, since the factory isn't running

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the conveyor belt has to move first

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If there's a container for materials

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he puts lead and gunpowder in it

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and Mr. Kim works hard

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Then how? He cuts the lead

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makes all the gunpowder, and a bullet comes out

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A bullet like this comes out

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So, how do we do this bullet?

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Here, let's load bullets onto the truck

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Like this, we load bullets onto the truck

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Then he'll come along this road in the truck

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Then he'll give me a bullet

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Then I'll shoot the bullet here, bang!

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It'll fly

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But I'm not going to shoot just once like this, and shoot three times

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Then what will happen?

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I'll have to make a phone call and wake up Mr. Kim

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If I asked Mr. Kim to make a bullet and shoot three times

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I'll have to say Mr. Kim three times

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Then, every time, Kim gets up

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lowers the lever, starts the factory

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puts in the lead, adds gunpowder, shaves it

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makes a bullet, gets on the truck, and delivers it to me

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And whenever I call Mr. Kim

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he'll have to keep repeating this process

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What if you were to

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burst and shoot in a way that

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we usually call a machine gun?

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It'll be like Mr. Kiiiiiim

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Then, Mr. Kim would continue

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to do this at high speed

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This would be very inefficient

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It would be inefficient

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If you were to make one bullet in this process

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this would inevitably happen

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If you were to improve this process

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what part would you improve

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to continuously shoot bullets quickly?

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Some might think

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Oh, we should improve the roads a bit

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You might think that way

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Then delivery would be faster, so that would be okay

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But you could also think this way

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This is a bullet factory

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Since it only produces one bullet, isn't that a waste?

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And if this factory stops and starts

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It would be overloaded

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So if you just turn on the factory

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and make a thousand bullets at once

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the factory would be really fast when making those things

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What if you make them?

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Then, you can just load them up and run

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Then, I can receive it without having to order from the factory anymore

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and shoot as many bullets as I want

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In other words, I can request this part all at once

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We call this batching

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We call it batch processing

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In reality, this process also happens, Batch

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Of course, this is the case in reality

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and this same process occurs on the computer side

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when doing some processing

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If we organize the terms

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this factory, in our computer software

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we can call it a file in computer science

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And the bullet created from this factory file

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is called an instance

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The bullet is created like this, right?

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I have to get an instance like this

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There is something that gets it like this

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This passage is called a Stream

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It is Stream, a

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It is called a stream

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Then, when I read the file

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and receive the instance through the Stream

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I only send the bullet

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What if we navigated to an image

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and double-click to open it?

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You double-click the file

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and ask it to open it

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That's a double-click

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When the file is opened

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memory data comes in through a stream

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To display it on the screen, we need an instance

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We take it and print pixels on the screen

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That's how it appears on the screen

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You can think of this bullet as the image you see on the screen

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This is a series of processes

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and the process of opening this file is ultimately slow

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When you open the file

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you can create

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many of them at once

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That's called batching

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Or, what can we say on our side?

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What's your labor pool?

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If you have some leftovers, can you give me some? Can you lend me some?

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They can say like this

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That's called a labor pool

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That's when we use the term pool

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00:15:17.000 --> 00:15:19.455
In this case, bullets, game objects

278
00:15:19.455 --> 00:15:21.955
creating these objects

279
00:15:21.955 --> 00:15:24.119
so that there are extra ones is called a Pool

280
00:15:24.119 --> 00:15:26.495
and we add an Object in front of it

281
00:15:26.495 --> 00:15:31.000
That's called Object Pool

282
00:15:31.000 --> 00:15:33.198
In other words, to improve this speed

283
00:15:33.198 --> 00:15:35.048
the task of creating multiple bullets

284
00:15:35.048 --> 00:15:37.000
and multiple objects in advance

285
00:15:37.000 --> 00:15:39.386
is called an object pool

286
00:15:39.386 --> 00:15:43.663
Opening this file is the same structure as a network server

287
00:15:43.673 --> 00:15:47.713
that is, when you access various websites such as Naver, Kakao

288
00:15:47.713 --> 00:15:49.742
or Google

289
00:15:49.742 --> 00:15:51.426
When you access a portal site

290
00:15:51.426 --> 00:15:53.554
When you connect

291
00:15:53.554 --> 00:15:56.604
to connect to their network

292
00:15:56.604 --> 00:15:58.911
this Connection happens

293
00:15:58.911 --> 00:16:01.000
The users make the connection

294
00:16:01.000 --> 00:16:02.109
This is the same

295
00:16:02.109 --> 00:16:05.792
I am a user who hits the website

296
00:16:05.792 --> 00:16:08.317
Then, a connection is made here

297
00:16:08.317 --> 00:16:11.594
This is the same as opening a file and doing this work

298
00:16:11.594 --> 00:16:14.109
When you send and receive data

299
00:16:14.109 --> 00:16:18.198
and this work continues every time you access it

300
00:16:18.198 --> 00:16:20.445
it will be slow

301
00:16:20.445 --> 00:16:24.376
If there are 1 million users, it will be very slow

302
00:16:24.376 --> 00:16:25.950
If there are 10 million users

303
00:16:25.950 --> 00:16:28.188
the server may even go down

304
00:16:28.188 --> 00:16:31.544
Since it is slow at this time

305
00:16:31.544 --> 00:16:33.832
opening a file is a very slow task

306
00:16:33.832 --> 00:16:37.327
Opening a network connection is a slow task

307
00:16:37.327 --> 00:16:40.000
So it would be good to have a connection pool

308
00:16:40.000 --> 00:16:43.000
That is why it is called a connection pool

309
00:16:43.000 --> 00:16:46.703
There are a series of computer science terms like this

310
00:16:46.703 --> 00:16:49.158
So when we fire our bullets

311
00:16:49.158 --> 00:16:51.108
we will first make them directly

312
00:16:51.108 --> 00:16:53.703
in the factory in the prototype

313
00:16:53.703 --> 00:16:56.327
Later, in the beta version, we will use the object pool

314
00:16:56.327 --> 00:16:59.127
to improve the speed in advance

315
00:16:59.127 --> 00:17:00.525
and work for it

316
00:17:00.525 --> 00:17:03.275
First, let's try making these bullets

317
00:17:03.275 --> 00:17:05.445
in the factory

318
00:17:05.445 --> 00:17:09.000
In Visual Studio, there is a Bullet section, right?

319
00:17:09.000 --> 00:17:11.218
This is a bullet that has already been made

320
00:17:11.218 --> 00:17:15.000
So, we need to fire that bullet

321
00:17:15.000 --> 00:17:18.000
So the firing will be done by the Player

322
00:17:18.000 --> 00:17:20.416
Since the Player pulls the trigger

323
00:17:20.416 --> 00:17:23.772
there is a script for moving the Player

324
00:17:23.772 --> 00:17:26.703
so now let's create a script for firing and paste it

325
00:17:28.465 --> 00:17:31.416
In the Project window, click +, and in C#

326
00:17:31.416 --> 00:17:35.327
this time, let's enter PlayerFire

327
00:17:39.000 --> 00:17:40.762
PlayerFire will be created like this

328
00:17:40.762 --> 00:17:43.436
If we drag and drop this onto

329
00:17:43.436 --> 00:17:45.136
our Player game object like this

330
00:17:45.136 --> 00:17:48.673
the PlayerFire script will be created

331
00:17:48.673 --> 00:17:50.485
Let's double-click and open it

332
00:17:55.594 --> 00:17:58.445
This is what PlayerFire does

333
00:17:58.445 --> 00:18:05.366
We want to create a bullet when the user presses the fire button

334
00:18:05.366 --> 00:18:07.337
We'll do this

335
00:18:07.337 --> 00:18:12.000
So, what properties are needed here?

336
00:18:12.000 --> 00:18:14.604
The planner needs to tell you

337
00:18:14.604 --> 00:18:17.742
There can be multiple bullet factories

338
00:18:17.742 --> 00:18:20.317
When making bullets, you said that they are made at bullet factories

339
00:18:20.317 --> 00:18:22.792
Then, when there are multiple bullet factories

340
00:18:22.792 --> 00:18:25.000
we need the address of the bullet factory

341
00:18:25.000 --> 00:18:27.426
to know which bullet factory to make them at

342
00:18:27.426 --> 00:18:30.228
So we need a bullet factory here

343
00:18:32.465 --> 00:18:37.792
And once the bullets are made

344
00:18:37.792 --> 00:18:40.208
where will they be placed and fired?

345
00:18:40.208 --> 00:18:43.000
You can't fire the bullets from your hand

346
00:18:43.000 --> 00:18:46.000
You need to decide whether to fire them from the wing or the muzzle

347
00:18:46.000 --> 00:18:47.000
You might need this

348
00:18:47.000 --> 00:18:51.000
So you might need a muzzle

349
00:18:51.000 --> 00:18:53.650
Let's add these two

350
00:18:53.650 --> 00:18:56.149
as required properties of the class

351
00:18:58.109 --> 00:19:00.614
First, let's make a bullet factory

352
00:19:00.614 --> 00:19:06.218
If you look at the bullet factory

353
00:19:06.218 --> 00:19:09.139
you can see a bullet already made here

354
00:19:09.139 --> 00:19:12.495
How do you make a bullet factory

355
00:19:12.495 --> 00:19:15.366
to make this bullet? You can make it like this

356
00:19:15.366 --> 00:19:19.000
If you look, I'll make another folder in Assets

357
00:19:19.000 --> 00:19:21.000
Press + and select Folder

358
00:19:21.000 --> 00:19:26.535
I'll put it under Prefabs

359
00:19:26.535 --> 00:19:29.000
I'll make a folder called Prefabs here

360
00:19:29.000 --> 00:19:31.673
This bullet factory

361
00:19:31.673 --> 00:19:34.495
is called a file on our side

362
00:19:34.495 --> 00:19:38.000
I want this bullet to become a file

363
00:19:38.000 --> 00:19:41.000
Then, we can open this file every time

364
00:19:41.000 --> 00:19:43.455
and create an instance of this bullet

365
00:19:43.455 --> 00:19:45.465
So, what does it look like conceptually?

366
00:19:45.465 --> 00:19:50.000
This thing in the Hierarchy is called an instance

367
00:19:50.000 --> 00:19:52.650
Everything that goes up in the Hierarchy scene

368
00:19:52.650 --> 00:19:53.802
is called an instance

369
00:19:53.802 --> 00:19:55.238
It's an instance

370
00:19:55.238 --> 00:19:58.317
It's already been created and is in memory

371
00:19:58.317 --> 00:20:00.167
However, it hasn't been

372
00:20:00.167 --> 00:20:02.119
saved to the hard disk yet

373
00:20:02.119 --> 00:20:05.168
The space where it's saved to the hard disk is this project window

374
00:20:05.168 --> 00:20:09.267
In other words, we call things saved to the hard disk files

375
00:20:09.267 --> 00:20:13.643
So, if I want this instance here to be a file

376
00:20:13.643 --> 00:20:15.891
where should it be?

377
00:20:15.891 --> 00:20:19.594
If it's in the project window, it'll be a file

378
00:20:19.594 --> 00:20:22.525
Conceptually, this is how Unity

379
00:20:22.525 --> 00:20:25.416
uses this UX

380
00:20:25.416 --> 00:20:28.436
If you grab a Bullet and drag and drop it

381
00:20:28.436 --> 00:20:30.772
into the Prefabs folder

382
00:20:30.772 --> 00:20:35.752
a bullet Prefabs named Bullet will be created

383
00:20:35.752 --> 00:20:36.970
This is a file

384
00:20:36.970 --> 00:20:38.720
In Unity, we call these

385
00:20:38.720 --> 00:20:41.039
Prefabs

386
00:20:41.039 --> 00:20:43.239
Game objects that have become files

387
00:20:43.239 --> 00:20:46.198
What do you call these?

388
00:20:46.198 --> 00:20:48.792
Prefabs

389
00:20:48.792 --> 00:20:51.901
So what about the color of this bullet?

390
00:20:51.901 --> 00:20:55.198
It's blue

391
00:20:55.198 --> 00:20:56.832
It turned into blue

392
00:20:56.832 --> 00:20:59.931
Since this bullet was created here

393
00:20:59.931 --> 00:21:03.574
I'm going to make it so that it's only created

394
00:21:03.574 --> 00:21:05.000
when the user presses the fire button

395
00:21:05.000 --> 00:21:07.000
You can delete this one

396
00:21:07.000 --> 00:21:09.386
Why? Because it's already a file

397
00:21:09.386 --> 00:21:11.386
 What? If you want to use it again?

398
00:21:11.386 --> 00:21:13.465
You can drag and drop it

399
00:21:13.465 --> 00:21:18.198
here or there

400
00:21:18.198 --> 00:21:21.257
You can create as many bullets as you want

401
00:21:21.257 --> 00:21:24.475
as instances

402
00:21:24.475 --> 00:21:27.257
If you have a file, you can open it

403
00:21:27.257 --> 00:21:30.327
to continue creating bullets here

404
00:21:30.327 --> 00:21:32.416
But when do you create this?

405
00:21:32.416 --> 00:21:34.475
When the user presses the fire button

406
00:21:34.475 --> 00:21:38.000
This becomes a bullet factory

407
00:21:38.000 --> 00:21:39.525
What is this?

408
00:21:39.525 --> 00:21:42.683
The game object has become a file

409
00:21:42.683 --> 00:21:43.871
It has become an asset

410
00:21:43.871 --> 00:21:47.148
So, we can declare the bullet factory like this

411
00:21:47.148 --> 00:21:54.009
How about putting it as a property

412
00:21:54.009 --> 00:21:55.346
public GameObject bulletFactory?

413
00:21:55.346 --> 00:21:58.564
It's for receiving the bullet factory, it's a variable

414
00:21:58.564 --> 00:22:00.000
Why is it a game object?

415
00:22:00.000 --> 00:22:03.208
Bullet factory, what was the prefab we were making in the first place?

416
00:22:03.208 --> 00:22:06.000
It was a game object

417
00:22:06.000 --> 00:22:08.450
If you look at Player

418
00:22:08.450 --> 00:22:11.000
Bullet Factory appears in Player Fire

419
00:22:11.000 --> 00:22:12.750
and you can drag and drop this Bullet

420
00:22:12.750 --> 00:22:15.000
into it like this

421
00:22:15.000 --> 00:22:18.000
That means the bullet factory is connected

422
00:22:18.000 --> 00:22:20.832
You have to pay attention to the name

423
00:22:20.832 --> 00:22:22.228
This isn't a bullet, what is it?

424
00:22:22.228 --> 00:22:24.614
It's a bullet factory

425
00:22:24.614 --> 00:22:29.000
Next, how do we make the muzzle?

426
00:22:29.000 --> 00:22:34.396
Let's put public GameObject

427
00:22:34.396 --> 00:22:37.376
firePosition here

428
00:22:37.376 --> 00:22:40.000
Then, we created the muzzle

429
00:22:40.000 --> 00:22:42.554
We don't have a muzzle yet

430
00:22:42.554 --> 00:22:46.495
Right, let's make a muzzle

431
00:22:46.495 --> 00:22:49.237
Let's see, I think the muzzle

432
00:22:49.237 --> 00:22:52.733
should be around this position on this Player

433
00:22:52.733 --> 00:22:54.583
If it has wings later

434
00:22:54.583 --> 00:22:57.663
I want it to shoot two shots

435
00:22:57.663 --> 00:23:00.752
Then I can put it here, right?

436
00:23:00.752 --> 00:23:03.663
So that the bullet comes out here

437
00:23:03.663 --> 00:23:05.063
Since it doesn't have that right now

438
00:23:05.063 --> 00:23:06.841
let's process it

439
00:23:06.841 --> 00:23:09.485
so the bullet comes out around this part

440
00:23:09.485 --> 00:23:12.129
So, if you select Player

441
00:23:12.129 --> 00:23:16.069
press + here and Create Empty

442
00:23:16.069 --> 00:23:19.643
It will go up to this level in the same Hierarchy structure

443
00:23:19.643 --> 00:23:21.119
We can drag and drop it

444
00:23:21.119 --> 00:23:24.515
to Player like this, but this method also exists

445
00:23:24.515 --> 00:23:27.089
If you right-click on Player

446
00:23:27.089 --> 00:23:30.139
you can see Create Empty

447
00:23:30.139 --> 00:23:32.178
or 3D Object here

448
00:23:32.178 --> 00:23:34.822
Let's click Create Empty here

449
00:23:34.822 --> 00:23:39.267
Then, it will be registered as a Player child

450
00:23:39.267 --> 00:23:42.208
The location will be registered at 0, 0

451
00:23:42.208 --> 00:23:46.049
Let's name it FirePosition

452
00:23:46.049 --> 00:23:47.396
For the muzzle

453
00:23:49.921 --> 00:23:52.445
Why did I set it to Empty?

454
00:23:52.445 --> 00:23:55.346
It doesn't need to be visible, so I made it like this

455
00:23:55.346 --> 00:23:59.356
Since it doesn't need to be visible, only the Transform is there

456
00:23:59.356 --> 00:24:05.515
It only has this that can adjust the location, rotation angle, and size

457
00:24:05.515 --> 00:24:09.346
I'll grab this FirePosition

458
00:24:09.346 --> 00:24:11.366
and put it here like this

459
00:24:11.366 --> 00:24:15.693
Then, the bullet will come out from this part

460
00:24:15.693 --> 00:24:18.238
So, if you select Player again

461
00:24:18.238 --> 00:24:21.000
you can see that I put FirePosition here

462
00:24:21.000 --> 00:24:23.400
Let's drag and drop

463
00:24:23.400 --> 00:24:26.307
FirePosition here

464
00:24:26.307 --> 00:24:29.634
Then, FirePosition is assigned

465
00:24:29.634 --> 00:24:32.742
What if there is no public?

466
00:24:32.742 --> 00:24:36.277
If there is no public

467
00:24:36.277 --> 00:24:41.733
if you go and look, FirePosition is gone

468
00:24:41.733 --> 00:24:42.633
Why is that?

469
00:24:42.633 --> 00:24:45.792
Only this public can be exposed to the outside

470
00:24:45.792 --> 00:24:48.802
So you have to attach it like this, public

471
00:24:48.802 --> 00:24:51.123
If you don't use anything

472
00:24:51.123 --> 00:24:55.257
the default access modifier is Private

473
00:24:55.257 --> 00:25:00.931
So I exposed bulletFactory and firePosition

474
00:25:00.931 --> 00:25:05.331
Now, let's implement this part

475
00:25:05.331 --> 00:25:07.681
to create bullets

476
00:25:07.681 --> 00:25:09.440
when the user presses the fire button

477
00:25:09.440 --> 00:25:13.140
These sentences must be placed in a function

478
00:25:13.140 --> 00:25:15.553
The functions we know are either Start or Update

479
00:25:15.553 --> 00:25:17.400
There is only one of these two

480
00:25:17.400 --> 00:25:20.050
Even if you create your own function

481
00:25:20.050 --> 00:25:21.400
you must put

482
00:25:21.400 --> 00:25:23.400
Start or Update in the function call

483
00:25:23.400 --> 00:25:26.450
So where should that sentence be implemented?

484
00:25:26.450 --> 00:25:29.050
If the call is made directly from Update

485
00:25:29.050 --> 00:25:34.200
to Start, it will be a bullet once when it is born

486
00:25:34.200 --> 00:25:37.200
And it may not even be possible to press the fire button

487
00:25:37.200 --> 00:25:40.500
So, let's put it in Update

488
00:25:40.500 --> 00:25:42.600
so that it can continuously create bullets

489
00:25:42.600 --> 00:25:45.919
whenever the user presses the fire button during its life

490
00:25:45.919 --> 00:25:48.219
To do this, the ultimate goal

491
00:25:48.219 --> 00:25:53.080
is to fire bullets, right?

492
00:25:53.080 --> 00:25:57.080
It's to create bullets, right?

493
00:25:57.080 --> 00:26:00.520
So, what do you need to fire bullets?

494
00:26:00.520 --> 00:26:04.703
You need bullets

495
00:26:04.703 --> 00:26:07.803
You need bullets to fire bullets

496
00:26:07.803 --> 00:26:10.839
And here's the question

497
00:26:10.839 --> 00:26:14.991
Why do you suddenly create bullets? According to this sentence

498
00:26:14.991 --> 00:26:21.519
since the user presses the fire button

499
00:26:21.519 --> 00:26:24.819
there are three things

500
00:26:24.819 --> 00:26:27.769
the user presses the fire button, a bullet is created

501
00:26:27.769 --> 00:26:29.911
and the bullet is fired

502
00:26:29.911 --> 00:26:32.960
Strictly speaking, firing a bullet

503
00:26:32.960 --> 00:26:34.610
means that when we create a bullet, we've already

504
00:26:34.610 --> 00:26:36.240
set it to go up

505
00:26:36.240 --> 00:26:38.800
We just need to decide where the bullet will come out

506
00:26:38.800 --> 00:26:45.560
So, if we set the location like this

507
00:26:45.560 --> 00:26:47.520
If you make a bullet and set the location

508
00:26:47.520 --> 00:26:50.120
the bullet will come out from that location

509
00:26:50.120 --> 00:26:53.080
So, if we look at it in order, the most important flow is that

510
00:26:53.080 --> 00:26:56.280
the user presses the fire button

511
00:26:56.280 --> 00:27:00.680
to create a bullet and set the location

512
00:27:00.680 --> 00:27:02.759
of the bullet

513
00:27:02.759 --> 00:27:06.360
So, if the user presses the fire button

514
00:27:06.360 --> 00:27:08.959
we can see this if the user

515
00:27:08.959 --> 00:27:10.320
presses the fire button

516
00:27:10.320 --> 00:27:14.870
The grammar used in the C# language then

517
00:27:14.870 --> 00:27:17.560
is called if

518
00:27:17.560 --> 00:27:20.520
If the user's input is processed

519
00:27:20.520 --> 00:27:23.439
we said that the Input class processes it

520
00:27:23.439 --> 00:27:26.641
Now, if we do ., among the properties or functions

521
00:27:26.641 --> 00:27:28.966
we'll use the function

522
00:27:28.966 --> 00:27:32.891
function GetButtonDown

523
00:27:32.891 --> 00:27:34.599
It means button is pressed

524
00:27:34.599 --> 00:27:35.959
Then there's also something that was pressed and then released, right?

525
00:27:35.959 --> 00:27:38.665
Then there's ButtonUp

526
00:27:38.665 --> 00:27:42.639
If you look here, Down means it was pressed, and Up means it was released

527
00:27:42.639 --> 00:27:44.289
Then what's being kept pressed?

528
00:27:44.289 --> 00:27:46.720
It's doing GetButton

529
00:27:46.720 --> 00:27:49.470
This uses GetButton when it is

530
00:27:49.470 --> 00:27:51.120
being kept pressed

531
00:27:51.120 --> 00:27:53.639
Since we will use the exact moment of pressing

532
00:27:53.639 --> 00:27:56.559
we'll use GetButtonDown

533
00:27:56.559 --> 00:28:00.239
Here, Fire1 means clicking the left mouse button

534
00:28:00.239 --> 00:28:04.680
or the left Ctrl button

535
00:28:04.680 --> 00:28:09.380
At this time, you can process the following contents

536
00:28:09.380 --> 00:28:12.599
to be implemented

537
00:28:12.599 --> 00:28:16.149
Fire1 is the Input Manager

538
00:28:16.149 --> 00:28:17.680
in Project Settings

539
00:28:17.680 --> 00:28:20.959
of the Edit menu of Unity

540
00:28:20.959 --> 00:28:23.400
There is an Input Manager in Project Settings

541
00:28:23.400 --> 00:28:26.464
Fire1 is set like this

542
00:28:29.959 --> 00:28:33.559
So first, if the user presses the fire button

543
00:28:33.559 --> 00:28:34.639
this part will be it

544
00:28:34.639 --> 00:28:37.720
If this is true, the button was pressed

545
00:28:37.720 --> 00:28:40.679
so that you can create a bullet

546
00:28:40.679 --> 00:28:43.759
How do you create a bullet in Unity?

547
00:28:43.759 --> 00:28:46.809
Instantiate, Mr. Kim, create a bullet

548
00:28:46.809 --> 00:28:48.839
in the bullet factory

549
00:28:48.839 --> 00:28:51.320
and give it to me

550
00:28:51.320 --> 00:28:55.000
It is called a factory method called Instantiate

551
00:28:55.000 --> 00:28:55.950
Factory function

552
00:28:55.950 --> 00:29:00.759
It automatically creates everything in this

553
00:29:00.759 --> 00:29:02.440
Giving it to me

554
00:29:02.440 --> 00:29:05.440
means creating a bullet in the bullet factory

555
00:29:05.440 --> 00:29:08.399
Instantiate, you can put a bullet factory here

556
00:29:08.399 --> 00:29:12.759
bulletFactory, if you put a bullet factory in

557
00:29:12.759 --> 00:29:15.240
it will create a bullet

558
00:29:15.240 --> 00:29:16.520
and it is just like a game object, right?

559
00:29:16.520 --> 00:29:19.199
If you put any of these game objects in

560
00:29:19.199 --> 00:29:22.158
It will clone it and create it

561
00:29:24.039 --> 00:29:25.440
This is just a function

562
00:29:25.440 --> 00:29:27.279
If you made one for me like this

563
00:29:27.279 --> 00:29:29.720
I could store it in a variable and use it

564
00:29:29.720 --> 00:29:32.080
when I set the position and do things like that

565
00:29:32.080 --> 00:29:38.119
I could do this GameObject bullet

566
00:29:38.119 --> 00:29:41.000
This here is a bullet factory

567
00:29:41.000 --> 00:29:42.119
and what is this?

568
00:29:42.119 --> 00:29:47.399
This is a file, and this is called an instance

569
00:29:47.399 --> 00:29:50.000
Since the instance from here is stored here

570
00:29:50.000 --> 00:29:52.000
you can think of this as an instance

571
00:29:52.000 --> 00:29:54.100
How do you set

572
00:29:54.100 --> 00:29:56.679
the position of the bullet itself?

573
00:29:56.679 --> 00:30:01.079
If you say bullet., you can draw a circle

574
00:30:01.079 --> 00:30:02.520
among your properties or functions

575
00:30:02.520 --> 00:30:04.520
Who has the position here?

576
00:30:04.520 --> 00:30:06.919
Transform has it, in the game object

577
00:30:06.919 --> 00:30:10.320
And if you say transform., what is the position

578
00:30:10.320 --> 00:30:13.639
among the properties or functions? Position

579
00:30:13.639 --> 00:30:16.199
Where are we going to set the position of this bullet?

580
00:30:16.199 --> 00:30:18.600
This part of the muzzle that we put here

581
00:30:18.600 --> 00:30:21.720
is this muzzle firePosition

582
00:30:21.720 --> 00:30:26.775
If you put this transform.position

583
00:30:26.775 --> 00:30:31.902
it will be assigned to the muzzle position

584
00:30:31.902 --> 00:30:36.119
Okay? Let's save it

585
00:30:36.119 --> 00:30:38.883
and go and press the play button

586
00:30:44.091 --> 00:30:47.160
Then, bang bang bang bang, the bullet will come out

587
00:30:47.160 --> 00:30:49.359
It will come out even if you move and shoot

588
00:30:49.359 --> 00:30:52.241
What do you think? You can see that it comes out from that location

589
00:30:52.241 --> 00:30:54.000
depending on the position of the muzzle

590
00:30:54.000 --> 00:30:55.559
Should I put it here?

591
00:30:55.559 --> 00:30:58.279
Bang bang bang bang, it will come out from that location

592
00:30:58.279 --> 00:31:00.359
Strangely enough, I'll turn off the play button

593
00:31:00.359 --> 00:31:02.799
So, the position of this muzzle is here, but where does it go?

594
00:31:02.799 --> 00:31:05.399
If I turn it off, it goes back to the original

595
00:31:05.399 --> 00:31:06.999
When we press the play button

596
00:31:06.999 --> 00:31:08.920
it doesn't get reflected if we change

597
00:31:08.920 --> 00:31:10.320
some values ​​or something

598
00:31:10.320 --> 00:31:13.959
Why? These are saved in a file

599
00:31:13.959 --> 00:31:15.109
but when there is a play button

600
00:31:15.109 --> 00:31:17.160
it is not saved in a file

601
00:31:17.160 --> 00:31:20.560
So, this exists only temporarily

602
00:31:20.560 --> 00:31:23.600
while playing the data

603
00:31:23.600 --> 00:31:26.959
Then, if you want these saved in this way to be saved

604
00:31:26.959 --> 00:31:29.640
you will have to learn the concept of saving later

605
00:31:29.640 --> 00:31:32.453
We will work on that in the beta version

606
00:31:34.760 --> 00:31:36.925
I have tried firing bullets like this

607
00:31:37.575 --> 00:31:41.367
Making Enemy Movement

608
00:31:41.880 --> 00:31:46.119
Then, let's try making an enemy move

609
00:31:46.119 --> 00:31:48.239
First, to move an enemy, you need an enemy

610
00:31:48.239 --> 00:31:52.000
So, let's make an enemy first

611
00:31:52.000 --> 00:31:58.079
In Hierarchy, press + and select Cube from 3D Object

612
00:31:58.079 --> 00:32:00.839
I'll call it Enemy

613
00:32:00.839 --> 00:32:03.600
I don't know if you noticed

614
00:32:03.600 --> 00:32:08.519
but we're doing the same process from the player

615
00:32:08.519 --> 00:32:09.880
to the bullets to the Enemy

616
00:32:09.880 --> 00:32:11.679
What do you do first?

617
00:32:11.679 --> 00:32:14.320
Make a game object

618
00:32:14.320 --> 00:32:16.399
In Hierarchy, create a cube

619
00:32:16.399 --> 00:32:20.720
create a script, assign the script

620
00:32:20.720 --> 00:32:22.320
then code

621
00:32:22.320 --> 00:32:25.480
and continue creating content with this flow

622
00:32:25.480 --> 00:32:29.279
The most difficult part of creating content with Unity is that

623
00:32:29.279 --> 00:32:30.880
you can learn each function individually

624
00:32:30.880 --> 00:32:33.760
However, you may have difficulty figuring out

625
00:32:33.760 --> 00:32:35.160
how to start and create content

626
00:32:35.160 --> 00:32:36.760
How do you do that?

627
00:32:36.760 --> 00:32:38.279
Just follow this

628
00:32:38.279 --> 00:32:39.320
What do you do first?

629
00:32:39.320 --> 00:32:42.959
Create a game object, a cube

630
00:32:42.959 --> 00:32:46.399
create a script for it, assign it

631
00:32:46.399 --> 00:32:48.749
Assign the script only to the game object

632
00:32:48.749 --> 00:32:51.480
that needs control

633
00:32:51.480 --> 00:32:54.440
You can continue to create characters

634
00:32:54.440 --> 00:32:57.440
with this flow

635
00:32:57.440 --> 00:32:59.200
Now that the Enemy has been created

636
00:32:59.200 --> 00:33:01.720
I will assign a script

637
00:33:01.720 --> 00:33:05.679
Before that, I will first set the transform position to 0, 0, 0

638
00:33:05.679 --> 00:33:08.079
and I will put it on top like this

639
00:33:08.079 --> 00:33:09.729
So, I'm going to create an enemy

640
00:33:09.729 --> 00:33:12.440
that falls down

641
00:33:12.440 --> 00:33:17.399
In the Enemy Scripts

642
00:33:17.399 --> 00:33:23.160
I will put "Enemy" as the name

643
00:33:23.160 --> 00:33:28.480
in the C# Script, like this

644
00:33:28.480 --> 00:33:30.799
Then, the Enemy will be created

645
00:33:30.799 --> 00:33:32.959
and I'll drag and drop it

646
00:33:32.959 --> 00:33:36.640
onto the Enemy game object

647
00:33:36.640 --> 00:33:39.559
Now, let's edit the script

648
00:33:39.559 --> 00:33:41.079
Here's the Enemy script

649
00:33:41.079 --> 00:33:42.160
You can click here

650
00:33:42.160 --> 00:33:44.248
or double-click here to open it

651
00:33:48.030 --> 00:33:52.254
When the Visual Studio

652
00:33:52.254 --> 00:33:54.959
for editing Enemy opens like this

653
00:33:54.959 --> 00:33:56.160
what I want to do here is

654
00:33:56.160 --> 00:33:59.679
if the bullet keeps going up

655
00:33:59.679 --> 00:34:04.359
I want the Enemy to keep moving down

656
00:34:04.359 --> 00:34:06.589
What do we need here?

657
00:34:09.440 --> 00:34:12.399
It's the movement speed

658
00:34:12.399 --> 00:34:15.760
So, public float speed

659
00:34:15.760 --> 00:34:18.483
Let's set this to the same speed as the Player

660
00:34:21.928 --> 00:34:25.320
And this content that we want to keep moving down

661
00:34:25.320 --> 00:34:26.720
we have to keep moving

662
00:34:26.720 --> 00:34:29.880
so we'll go into Update

663
00:34:29.880 --> 00:34:34.079
It's the same, right? It finds the direction and moves in that direction

664
00:34:34.079 --> 00:34:41.720
So, this puts dir

665
00:34:41.720 --> 00:34:43.720
in Vector3, and what's the direction?

666
00:34:43.720 --> 00:34:48.799
If you put Down in Vector3, it means down

667
00:34:48.799 --> 00:34:49.839
And then we want to move

668
00:34:49.839 --> 00:34:53.320
I said that P=P0+vt can be used at once

669
00:34:53.320 --> 00:34:59.927
What about the position of the transform?

670
00:34:59.927 --> 00:35:06.199
transform.position = dir * speed * Time.deltaTime

671
00:35:06.199 --> 00:35:08.599
You can do this, but how about this?

672
00:35:08.599 --> 00:35:11.880
t simply updates the current position

673
00:35:11.880 --> 00:35:14.030
It's just P=vt

674
00:35:14.030 --> 00:35:17.630
For this to function normally, P=P0+

675
00:35:17.630 --> 00:35:22.305
you can do it like this

676
00:35:22.305 --> 00:35:25.055
What do you think? P0+vt

677
00:35:25.055 --> 00:35:28.799
But since this is also a language, it can be abbreviated

678
00:35:28.799 --> 00:35:31.099
Just like we say teacher as T

679
00:35:31.099 --> 00:35:33.749
and food waste as FW

680
00:35:33.749 --> 00:35:38.039
This can also be abbreviated like this

681
00:35:38.039 --> 00:35:43.558
If we do this, it becomes P=P0+vt

682
00:35:43.558 --> 00:35:47.158
Likewise, if we go to Bullet

683
00:35:47.158 --> 00:35:49.358
it is also like this

684
00:35:49.358 --> 00:35:51.840
We can abbreviate this part

685
00:35:51.840 --> 00:35:55.948
In Bullet, we can write += like this

686
00:35:58.200 --> 00:36:02.050
Right? So in Enemy or bullet

687
00:36:02.050 --> 00:36:05.900
or P=P0+vt, you can do the transformation

688
00:36:05.900 --> 00:36:08.360
by adding like this

689
00:36:08.360 --> 00:36:09.447
Save it

690
00:36:14.477 --> 00:36:21.096
If you press the play button, you can create

691
00:36:21.096 --> 00:36:24.951
an enemy that comes down

692
00:36:24.951 --> 00:36:29.201
You can create an enemy that comes down like this

693
00:36:29.201 --> 00:36:32.051
Let's use vectors a little more

694
00:36:32.051 --> 00:36:35.687
and write code to make this enemy move

695
00:36:35.687 --> 00:36:38.487
toward the player

696
00:36:38.487 --> 00:36:41.751
We can use vector subtraction, right?

697
00:36:41.751 --> 00:36:46.635
So what we want to do this time is not to go down

698
00:36:50.839 --> 00:36:52.391
but to continue

699
00:36:55.400 --> 00:37:00.500
moving towards the target

700
00:37:00.500 --> 00:37:03.480
Then, what else do we need besides the required movement speed?

701
00:37:03.480 --> 00:37:06.146
We need a target

702
00:37:08.199 --> 00:37:11.899
This target is public

703
00:37:11.899 --> 00:37:15.049
The target is a player in the world

704
00:37:15.049 --> 00:37:18.679
This is a game object

705
00:37:18.679 --> 00:37:22.055
So, let's put GameObject here

706
00:37:24.399 --> 00:37:28.449
Okay, so you can put public GameObject followed by the target

707
00:37:28.449 --> 00:37:31.960
Ultimately, we need

708
00:37:31.960 --> 00:37:35.510
not just the game object but also the location of this target

709
00:37:35.510 --> 00:37:37.410
Who has the location?

710
00:37:37.410 --> 00:37:39.110
The one that has the location of the game object

711
00:37:39.110 --> 00:37:41.360
is Transform

712
00:37:41.360 --> 00:37:45.320
So we only need to know this player's legs

713
00:37:45.320 --> 00:37:46.568
Where are the legs, right?

714
00:37:49.597 --> 00:37:52.780
Here is instructor Lee Young-ho

715
00:37:52.780 --> 00:37:56.720
There is instructor Lee Young-ho, but if I don't know the entire

716
00:37:56.720 --> 00:37:59.770
but the bridge's current location

717
00:37:59.770 --> 00:38:01.920
I can monitor the bridge

718
00:38:01.920 --> 00:38:03.800
and get its location

719
00:38:03.800 --> 00:38:07.900
So, I only need to know about this component called Transform

720
00:38:07.900 --> 00:38:11.479
So I can put GameObject here

721
00:38:11.479 --> 00:38:13.779
but I can also put Transform like this

722
00:38:13.779 --> 00:38:15.879
I just need to remember

723
00:38:15.879 --> 00:38:17.417
this Enemy's Transform

724
00:38:20.023 --> 00:38:22.573
So if I save it like this

725
00:38:22.573 --> 00:38:25.639
and go to Enemy, the target will be exposed

726
00:38:25.639 --> 00:38:27.555
here is Transform here

727
00:38:27.555 --> 00:38:29.405
and I will show you an important concept here

728
00:38:29.405 --> 00:38:32.153
The player here is a game object

729
00:38:32.153 --> 00:38:35.453
I want the Enemy to follow the game object

730
00:38:35.453 --> 00:38:37.303
To be clear

731
00:38:37.303 --> 00:38:39.320
this Transform in Player

732
00:38:39.320 --> 00:38:41.770
needs to go into Enemy

733
00:38:41.770 --> 00:38:43.770
But you can put it like this

734
00:38:43.770 --> 00:38:46.170
If I grab the player, grab the game object

735
00:38:46.170 --> 00:38:47.839
and put it into this target

736
00:38:47.839 --> 00:38:49.289
it wants to Transform

737
00:38:49.289 --> 00:38:51.139
so I put the game object called Player

738
00:38:51.139 --> 00:38:54.039
Then, the Player's Transform

739
00:38:54.039 --> 00:38:55.419
is automatically assigned like this

740
00:38:55.419 --> 00:38:57.869
Unity has such a great

741
00:38:57.869 --> 00:39:00.818
User Experience

742
00:39:00.818 --> 00:39:06.398
It even automatically assigns the player transform

743
00:39:06.398 --> 00:39:09.760
So, we set the target for the enemy

744
00:39:09.760 --> 00:39:12.880
Then, since we want to keep moving towards the target

745
00:39:12.880 --> 00:39:17.499
the player will be in here

746
00:39:17.499 --> 00:39:19.899
Then, let's find the direction

747
00:39:19.899 --> 00:39:21.559
to go towards this target

748
00:39:21.559 --> 00:39:25.294
Not down, now it's the target

749
00:39:28.660 --> 00:39:33.400
How do we find the direction towards the target?

750
00:39:33.400 --> 00:39:39.480
Target-Me, one of the properties in the target is position

751
00:39:39.480 --> 00:39:41.160
We need the position

752
00:39:41.160 --> 00:39:42.910
-Me, my position

753
00:39:42.910 --> 00:39:45.279
can be written as transform.position

754
00:39:45.279 --> 00:39:48.829
Then, Target-Me

755
00:39:48.829 --> 00:39:51.229
can find the vector

756
00:39:51.229 --> 00:39:53.759
that I'm heading toward the target

757
00:39:53.759 --> 00:39:58.680
But we can't just use the entire path

758
00:39:58.680 --> 00:40:03.269
How? We set the size of this vector like this

759
00:40:03.269 --> 00:40:04.669
and move at my speed

760
00:40:04.669 --> 00:40:07.400
This act of making the size of the vector 1

761
00:40:07.400 --> 00:40:09.400
is called Normalize

762
00:40:09.400 --> 00:40:12.950
So, if we call the function Normalize

763
00:40:12.950 --> 00:40:17.040
for this direction

764
00:40:17.040 --> 00:40:19.968
what happens to the size of this direction we found?

765
00:40:19.968 --> 00:40:21.246
We make it 1

766
00:40:23.867 --> 00:40:27.559
If we do this, there will be no change in that direction

767
00:40:27.559 --> 00:40:31.519
Let's save it like this and go back and look

768
00:40:31.519 --> 00:40:33.080
Let's press the play button

769
00:40:33.080 --> 00:40:36.830
Then, the enemy will continue to follow me

770
00:40:36.830 --> 00:40:40.160
as I move

771
00:40:40.160 --> 00:40:44.060
Do you see? You can make an enemy

772
00:40:44.060 --> 00:40:45.994
that follows the player like this

773
00:40:48.954 --> 00:40:51.804
Then, it will continue to follow me like this

774
00:40:51.804 --> 00:40:53.854
but I will change it

775
00:40:53.854 --> 00:40:55.639
so that it only follows me once when I am born

776
00:40:55.639 --> 00:40:57.439
Once when I am born

777
00:41:01.765 --> 00:41:07.415
I want to find the direction in which I was born

778
00:41:07.415 --> 00:41:12.014
and keep moving in that direction

779
00:41:12.014 --> 00:41:14.759
I want to keep moving in that direction

780
00:41:14.759 --> 00:41:16.859
Instead of continuing to move towards the target

781
00:41:16.859 --> 00:41:18.399
What happens then?

782
00:41:18.399 --> 00:41:20.839
I need to find the direction once when I am born

783
00:41:20.839 --> 00:41:23.240
It's not something you keep looking for as you live

784
00:41:23.240 --> 00:41:25.320
How do you look for it?

785
00:41:25.320 --> 00:41:27.759
Since the time of birth is the Start, let's do it here

786
00:41:27.759 --> 00:41:32.199
But we can't use the dir here

787
00:41:32.199 --> 00:41:34.606
This variable in Start

788
00:41:34.606 --> 00:41:37.124
is called a local variable

789
00:41:37.124 --> 00:41:40.374
In Update, we can't access this local variable

790
00:41:40.374 --> 00:41:42.559
in another function

791
00:41:42.559 --> 00:41:45.000
Then where should I put it so that I can access it?

792
00:41:45.000 --> 00:41:48.550
You have to register it globally as an attribute

793
00:41:48.550 --> 00:41:49.679
to use it

794
00:41:49.679 --> 00:41:52.529
So let's put the dir of the Vector here

795
00:41:52.529 --> 00:41:56.639
in the attribute section like this

796
00:41:56.639 --> 00:42:00.189
I'll process them like this so they use

797
00:42:00.189 --> 00:42:02.440
the dir I registered here

798
00:42:02.440 --> 00:42:05.520
Then, this one has the lights on, right?

799
00:42:05.520 --> 00:42:07.520
They'll all be the same

800
00:42:07.520 --> 00:42:12.600
So when it's born, it gets a direction once

801
00:42:12.600 --> 00:42:17.360
and wants to keep moving in that direction

802
00:42:17.360 --> 00:42:19.223
This one gets a direction when it's born

803
00:42:25.599 --> 00:42:28.505
It wants to keep moving

804
00:42:30.960 --> 00:42:34.160
So let's save it, and when it's born, it gets it once

805
00:42:34.160 --> 00:42:36.960
and wants to keep moving in that direction

806
00:42:36.960 --> 00:42:38.399
I'll go and try it

807
00:42:38.399 --> 00:42:41.759
Then, I'll put it on the side like this so it's noticeable

808
00:42:41.759 --> 00:42:44.338
When I press the play button, even if I dodge

809
00:42:44.338 --> 00:42:46.743
this one will keep moving in the direction

810
00:42:46.743 --> 00:42:48.692
it initially got

811
00:42:52.559 --> 00:42:57.279
This is how the Enemy was created

812
00:42:57.279 --> 00:42:59.279
If the enemy is made like this

813
00:42:59.279 --> 00:43:01.160
some guys will come down

814
00:43:01.160 --> 00:43:03.610
and some will go towards the target

815
00:43:03.610 --> 00:43:05.399
which may be necessary

816
00:43:05.399 --> 00:43:08.599
So, let's implement it like this

817
00:43:08.599 --> 00:43:11.440
to set it randomly

818
00:43:11.440 --> 00:43:17.390
So randomly, with a 30% probability

819
00:43:17.390 --> 00:43:19.480
some guys will go towards the target

820
00:43:19.480 --> 00:43:23.200
and others will just go down

821
00:43:23.200 --> 00:43:26.250
Then, if they all move towards the target unconditionally

822
00:43:26.250 --> 00:43:28.168
it will be difficult for the player

823
00:43:28.168 --> 00:43:32.720
So let's give them this kind of variation

824
00:43:32.720 --> 00:43:35.520
Then, when they are born, the content will be entered

825
00:43:35.520 --> 00:43:37.880
when they find this direction

826
00:43:37.880 --> 00:43:39.330
How are we going to do it?

827
00:43:39.330 --> 00:43:49.399
Find the direction towards the target with a 30% probability

828
00:43:49.399 --> 00:43:51.109
otherwise, if it's outside of 30%

829
00:43:51.109 --> 00:43:59.497
Just set the direction down

830
00:43:59.497 --> 00:44:02.822
Let's put it like this

831
00:44:02.822 --> 00:44:05.839
Then, we can get a 30% probability like this

832
00:44:05.839 --> 00:44:08.000
First, let's get the probability

833
00:44:08.000 --> 00:44:18.499
Let's put in int for the probability

834
00:44:18.499 --> 00:44:20.440
Let's put in percent

835
00:44:20.440 --> 00:44:26.599
If you look at Random, there's something called Range

836
00:44:29.813 --> 00:44:31.263
There's also RandomRange

837
00:44:31.263 --> 00:44:32.799
but it's not used here

838
00:44:32.799 --> 00:44:33.899
Let's put it as Range

839
00:44:33.899 --> 00:44:39.559
Let's put in 1 to 10 here

840
00:44:39.559 --> 00:44:44.600
So, what does this Range look like?

841
00:44:44.600 --> 00:44:48.760
It says maxExclusive

842
00:44:48.760 --> 00:44:52.399
If you go inside, it looks like this

843
00:44:52.399 --> 00:44:57.000
It goes int and works

844
00:44:57.000 --> 00:45:03.320
So we're going to use it here

845
00:45:03.320 --> 00:45:06.119
Let's get percent from 1 to 10

846
00:45:06.119 --> 00:45:11.359
Then how do we say that this has a 30% probability?

847
00:45:11.359 --> 00:45:14.110
If it's less than 3, right? Then it's 30%

848
00:45:14.110 --> 00:45:16.600
If it's greater than 3? It's a different probability

849
00:45:16.600 --> 00:45:27.839
So the probability of 30% is it(percent <= 3)

850
00:45:27.839 --> 00:45:30.320
It includes 3, right? Because it's 1,2,3

851
00:45:30.320 --> 00:45:33.440
Then what do we do?

852
00:45:33.440 --> 00:45:37.540
In the direction of the target like this

853
00:45:37.540 --> 00:45:41.200
Let's get it in the direction of the target

854
00:45:41.200 --> 00:45:44.006
This part is the 30% probability

855
00:45:48.333 --> 00:45:51.799
Otherwise, what do we do? Since we just did it down

856
00:45:51.799 --> 00:45:57.920
we did else like this, so it's just down

857
00:45:57.920 --> 00:46:04.820
So you can do this dir = Vector3.down

858
00:46:04.820 --> 00:46:06.119
You can do like this

859
00:46:06.119 --> 00:46:10.978
Should we save it and go and take a look?

860
00:46:10.978 --> 00:46:14.228
If you press the play button

861
00:46:14.228 --> 00:46:18.328
you can see that this moves down or towards the target

862
00:46:18.328 --> 00:46:21.239
with a 30% probability

863
00:46:21.239 --> 00:46:25.235
We've learned about the enemy's movement up to here

864
00:46:26.730 --> 00:46:30.000
Let's summarize what we learned in this section

865
00:46:30.000 --> 00:46:31.400
The first learning content

866
00:46:31.400 --> 00:46:33.839
was implementing bullet movement

867
00:46:33.839 --> 00:46:37.389
We created a Bullet game object and wrote a C# script

868
00:46:37.389 --> 00:46:40.559
to move it up

869
00:46:40.559 --> 00:46:44.239
The second learning content was implementing shooting bullets

870
00:46:44.239 --> 00:46:46.289
We created Bullet Prefabs

871
00:46:46.289 --> 00:46:47.789
and used the Player Fire script

872
00:46:47.789 --> 00:46:50.439
to fire bullets

873
00:46:50.439 --> 00:46:53.239
when the user presses the fire button

874
00:46:53.239 --> 00:46:56.359
The last learning content was creating enemy movement

875
00:46:56.359 --> 00:46:57.909
We created an enemy object

876
00:46:57.909 --> 00:47:01.868
and wrote a script to move it down

877
00:47:01.868 --> 00:47:03.792
Thank you for your hard work

878
00:47:04.905 --> 00:47:05.746
Create a bullet movement
Create a bullet and set its position

879
00:47:05.746 --> 00:47:06.605
Create [+] - [3D Object] - [Cube] in the hierarchy and rename it to Bullet
Change the position and size of the bullet in the Bullet's Transform

880
00:47:06.605 --> 00:47:07.355
Create and assign Bullet script
Create [Scripts] - [+] - [C# Script] in the project window and rename it to Bullet

881
00:47:07.355 --> 00:47:08.186
Drag and drop the Bullet script to the Bullet game object's component

882
00:47:08.186 --> 00:47:08.986
Implement Bullet movement script
Create a speed variable with public access modifier so that it is exposed on the Unity editor

883
00:47:08.986 --> 00:47:09.825
Add implementation to the Update function so that it is continuously called
Find the up direction and implement the movement part using the movement formula P = P0 + vt

884
00:47:09.825 --> 00:47:10.775
Create a bullet launcher
Create and assign a PlayerFire script
Create [+] - [C# Script] in the Project window and rename it to PlayerFire

885
00:47:10.775 --> 00:47:11.575
Drag and drop the PlayerFire script as a component of the Player game object

Create and assign Bullet Prefabs

886
00:47:11.575 --> 00:47:12.375
Create a folder in the Project window and rename it to Prefabs
Drag and drop the Bullet object in the hierarchy to the Prefabs folder in the Project window

887
00:47:12.375 --> 00:47:13.325
Remove Bullet from the scene and assign Bullet Prefabs to the Bullet Factory property of PlayerFire

Create a gun barrel and assign properties

888
00:47:13.325 --> 00:47:14.125
Select the Player object, right-click, select Create Empty, and rename the empty game object registered as a child to FirePosition

889
00:47:14.125 --> 00:47:14.963
Assign the FirePosition object to the Player's PlayerFire script

890
00:47:14.963 --> 00:47:16.213
Processing bullet firing input
We need to produce a bullet every time the fire button is pressed, so input it in the Update function

891
00:47:16.213 --> 00:47:17.413
Use the GetButtonDown function that returns True when the button is pressed
When the left mouse or left Ctrl button is clicked, input processing is 'Fire1'

892
00:47:17.413 --> 00:47:18.613
When bulletFactory is input as an argument to the Instantiate function, a bullet is generated

893
00:47:18.613 --> 00:47:19.853
Assign the position of the muzzle, firePosition, declared as a property to the created bullet object

894
00:47:19.853 --> 00:47:21.553
Enemy Movement Production
Create Enemy object and assign script
Create [+] - [3D Object] - [Cube] in the hierarchy and rename it to Enemy

895
00:47:21.553 --> 00:47:23.103
Create [Scripts folder] - [+] - [C# Script] in the project window and rename it to Enemy
Drag and drop the Enemy script to the Enemy game object's component

896
00:47:23.103 --> 00:47:24.648
Write movement code
Declare the movement speed property, find the direction, and implement the code with the movement formula