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Hello, guys.

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In this video, we're going to talk about collisions and rigid bodies.

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And these two components are very important and basically essential for game development.

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All right.

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We're going to begin with the rigid body.

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So I want to select my square, the first one.

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Let's make his scale one and one and place it somewhere here.

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And then we're going to click add component and find rigid body 2D, because we work into this space.

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All right.

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So now it has rigid body.

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Now physics and gravity is applied to this object.

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Now, if I go to play mode and before I do that, let me change aspect here to 16 to 9 like that, right?

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Because this is what most of the resolutions are on, the computers and phones and so on.

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Now watch this.

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I go to play mode and my square begin to fall because now properties of the physics is applied to this

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object.

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Now let's take a look at the rigid body.

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I'm going to close these two.

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There are body type dynamic, kinematic and static and dynamic means physics applied to this rigid body

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and it can be moved.

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Then there is a kinematic and that means it can be moved, but physics is not applied to the object.

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So now if I select it, you can see there is no gravity, but still it can be moved and static means

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it cannot be moved at all.

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So when we run the game, even if you apply some force to it, it won't be moved.

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It will be static.

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So.

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Yeah, that's how it is.

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Let's change it back to dynamic and see.

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There is a material physics material and we're going to use it later, so I'll just leave it for now.

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Some other important settings here is the mass of the body Drag and gravity scale.

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Mass is used to define what object is heavier compared to others.

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And later on we're going to use some examples to see that.

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For now, let's just leave it like that drag use basically as an air resistance.

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So if you have lots of drugs on the object, it will fall slower, for example.

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Well, we can compare it right now.

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Look how it falls.

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And then if I move it up and said, Drag over five, let's say look now.

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False.

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Much slower.

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You can see that, right?

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And if I change it back to zero.

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False faster.

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Then there is some other settings we don't want to mess with right now, but we want to open constraints

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and see what's here.

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Here you can freeze position of the object and freeze rotation, which can be useful in some cases.

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Later on we're going to use it with a character and I want to show you what it does.

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But before we do that, let's talk about colliders.

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Let's click add component of the Box Collider to D, and now we can see there is a collider on this

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object and you should know the shape of the object defined by the collider, not the look of it, not

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the sprite.

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If I take this square over here and add the box collider to it and we don't need it by the collider

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is enough and hit play something like this.

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Look.

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It's going to fall on the top.

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And if I, let's say, place it like this.

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Oh, wait a second.

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Wait a second.

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We need to add another collider here.

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Box Collider to the.

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Let's say I place them like this and take my first square and place them like this.

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Right?

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So clearer we can see that Sprite is not reaching the platform on the left, but there is a collider

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that does that.

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So that's why it doesn't fall.

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Shape is defined by the collider, not the object.

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If I go here to the size and set one and one.

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And offset zero zero.

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We can see it felt true because Collider is not.

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Where is it?

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All right.

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So far.

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Let me do it again.

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Zero zero and one.

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And one.

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So now we can see it does not reach the platform and probably it will fall through.

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Neglect me now.

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But if we select this object and freeze rotation on the Z, look what's going to happen.

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It doesn't fall because rotation is blocked.

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Very simple.

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Yeah.

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Boom.

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And already you can make some cool stuff with it, For example.

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Let me delete this one.

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Use this one.

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Make it bigger with a tt w to move and I want to add rigid body to it region by the two D.

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I want to make it dynamic, but I want to freeze position on the X and on the y.

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But I want to keep the rotation.

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And this one I'll change back to square.

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Now look what's going to happen on.

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You can make cool platforms as false and that's how it is.

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Collider can be used in different ways and we're going to do that later as well and worry about it like

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everything comes at the right time.

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And before I finish this video, I want to say something important.

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Listen to me carefully.

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This is how it works.

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You just basically take an object, you create an empty object, and let's say it will be your player.

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All right, then you give it a Sprite renderer to define a look of it and.

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This one doesn't have any.

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You don't need to follow me now.

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It's just an example.

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So now this one has a picture.

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Very cool.

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Right.

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Then I want to make it full so it behaves like an object.

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You add another component of rigid body and then you give it a collider.

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And basically you have your player here who can run and fold.

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So this is how it is.

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And then you add some different components to behave in different like if you want to make an animation

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for the player, you add animator and then you make animations.

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And this is very easy.

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You just need to understand how it works and get used to components and know what component you can

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use when to make the task you need.

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All right.

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Very simple.

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Very cool.

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All right.

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Let's go to the next video and create the player properly, and I'll delete this one.