WEBVTT 00:00.000 --> 00:00.420 Hello guys. 00:00.420 --> 00:01.380 Welcome to the video. 00:01.380 --> 00:07.650 In this one I want to tell you about very important aspect of development and that is components of 00:07.650 --> 00:08.340 unity. 00:08.340 --> 00:13.590 So for now I'm going to delete this full image over here. 00:13.590 --> 00:14.610 Let's delete it. 00:14.610 --> 00:19.830 And let's just click right button and click Create Empty. 00:20.040 --> 00:24.300 So now we can see we have a game object that is empty. 00:24.300 --> 00:27.150 And it has only one component transform. 00:27.150 --> 00:28.830 Transform cannot be removed. 00:28.830 --> 00:30.300 It is there by default. 00:30.720 --> 00:36.570 And transform is needed to define where object is in the world, what is rotation and what's his scale. 00:36.570 --> 00:37.890 That is very important. 00:37.890 --> 00:44.370 So transform is a component, and there are other components that we need to give certain properties 00:44.370 --> 00:48.720 to the game object or set certain behavior on the game object. 00:48.720 --> 00:53.130 We can imagine like you know, game object is like a car, for example. 00:53.130 --> 01:01.500 And just as a car has different parts like engine wheels, lights, and each part gives different functionality 01:01.500 --> 01:05.700 to the car, same way components give different functionality to the game object. 01:05.700 --> 01:08.940 As example, we have an empty game object and it does nothing. 01:08.940 --> 01:09.900 It is just there. 01:09.900 --> 01:13.950 But let's say we create 2D sprite square. 01:14.830 --> 01:21.970 We can see that this square has a transform, same as the previous one, but also it has a sprite renderer 01:21.970 --> 01:25.420 and this one responsible for the visuals of this game object. 01:25.450 --> 01:32.680 Now that we know that this square looks like this because it has sprite renderer, uh, let's change 01:32.680 --> 01:34.630 color of this square. 01:36.250 --> 01:39.880 To something darker and let's just rename it. 01:40.810 --> 01:42.910 To platform. 01:43.740 --> 01:44.430 Okay. 01:44.430 --> 01:46.740 Now I'm going to select this platform. 01:46.860 --> 01:47.730 Press move tool. 01:47.730 --> 01:48.630 Move it down. 01:48.630 --> 01:52.260 And then I want to stretch it just like so. 01:52.650 --> 01:55.740 So now we created a game object platform I'm sorry for the name. 01:59.010 --> 01:59.400 Yeah. 01:59.400 --> 02:06.420 So now we created a game object that is platform, and it has the dark blue color and it has this shape 02:06.420 --> 02:08.940 because we changed the scale on the transform. 02:08.940 --> 02:11.010 Now we can create another object. 02:11.010 --> 02:18.540 Let's do 2D sprite circle and let's name it as player maybe okay. 02:18.540 --> 02:23.820 So now we have another game object in the game that has very similar components. 02:23.820 --> 02:26.730 And we want player to behave in a certain way. 02:26.730 --> 02:32.850 For example, we want this player which looks like a ball to fall when we play the game. 02:32.850 --> 02:35.340 We want it to be affected by gravity. 02:35.370 --> 02:36.480 How could we do that? 02:36.480 --> 02:41.670 Well, we could achieve that by adding new component to this game object. 02:41.730 --> 02:44.730 Let's go over here and click Add Component. 02:45.610 --> 02:51.010 And here you can see we have so many components, so many different things, but we're going to discuss 02:51.010 --> 02:51.940 them as we use them. 02:51.940 --> 02:53.380 So don't worry about everything. 02:53.380 --> 02:56.470 Just type rigidbody in the search field. 02:56.470 --> 03:00.520 And here we need to choose 2D because we work with the 2D objects. 03:00.520 --> 03:01.750 Let's click 2D. 03:01.780 --> 03:08.860 Now this object not only has visuals of a circle of a white color, but also it has a rigid body and 03:08.860 --> 03:14.170 that makes it behave like an object, like a physical object in a game world. 03:14.170 --> 03:20.500 If we select here, play focus so it will not open full screen and go to play mode. 03:22.270 --> 03:24.430 You can see that player now is falling down. 03:24.430 --> 03:28.270 So we change the behavior of the object by adding a component. 03:28.450 --> 03:31.630 And game development is just about that. 03:31.630 --> 03:36.490 You take an object, you give it different components and define how you want it to behave. 03:36.490 --> 03:41.530 And you set this behavior with a component that you put on the game object. 03:41.530 --> 03:44.800 Also, there is a way to create custom components. 03:44.800 --> 03:46.120 We call them scripts. 03:46.120 --> 03:48.820 They are just behavior as we need. 03:48.820 --> 03:51.640 But as of now let's just try to do something else. 03:52.280 --> 03:57.590 Let's say we have this ball falling and we like it, and we like how it looks, but we don't like that 03:57.590 --> 03:59.840 it is falling through the platform. 03:59.840 --> 04:04.760 That happens because unity does not know what is the shape of the object. 04:04.760 --> 04:10.160 It knows how it looks, it knows it's supposed to fall, and it's supposed to be affected by gravity, 04:10.160 --> 04:14.120 but it doesn't know what is the shape, where is the end of the object? 04:14.120 --> 04:15.890 Maybe just like that. 04:16.190 --> 04:17.420 Maybe it's just like that. 04:17.420 --> 04:18.530 Unity doesn't know. 04:18.530 --> 04:25.550 So we have to add another component to tell unity, hey, this object has this shape, and shape is 04:25.550 --> 04:29.510 usually defined by the colliders that we put on the object. 04:29.840 --> 04:32.030 So let's click Add Component. 04:32.030 --> 04:37.910 And because this is a circle over here we can just type circle Collider 2D. 04:37.910 --> 04:39.380 And let's just choose it. 04:40.140 --> 04:40.620 Now. 04:40.620 --> 04:46.470 By default it will take the shape of the sprite, but if we would want to make it bigger, we could 04:46.470 --> 04:51.690 choose Edit Collider and Stretch Collider to the size we want. 04:51.720 --> 04:54.570 However, we don't want to stretch Collider right now. 04:54.570 --> 04:59.520 It is okay, so let's just click reset and it's going to be default as it was before. 04:59.520 --> 05:05.640 And now let's go to the play mode and see if ball will be stopped by the platform. 05:09.140 --> 05:11.240 And no, it fell through the platform. 05:11.240 --> 05:12.080 Same as before. 05:12.080 --> 05:12.920 Why is that? 05:12.920 --> 05:14.540 Well, that is very simple. 05:14.540 --> 05:17.150 You need to knows what is the shape of this object. 05:17.150 --> 05:20.180 You need to know what is the collision should be for this object. 05:20.180 --> 05:23.960 But you need to know nothing about collision on this platform. 05:23.960 --> 05:26.570 So we have to add component here. 05:26.570 --> 05:29.510 And for example type box collider 2D. 05:31.870 --> 05:33.880 Now again it will take shape of a sprite. 05:33.880 --> 05:35.980 So we don't need to edit anything here. 05:35.980 --> 05:39.430 And let's just go to play mode right now and try it out. 05:40.320 --> 05:43.800 And boom ball is falling on the platform. 05:43.800 --> 05:44.610 Very cool. 05:44.610 --> 05:47.910 So believe me or not, this is already a game. 05:47.910 --> 05:50.250 In fact, we could do something here. 05:50.250 --> 05:59.340 Let's, um, let's click right button create and we need to find 2D physics material 2D okay. 05:59.340 --> 06:01.710 Let's just call it matte for now. 06:01.710 --> 06:06.120 I'm going to exit play mode because when you do changes in the play mode they are not saved. 06:07.820 --> 06:11.060 And here on the material, let's add Bounciness here. 06:11.060 --> 06:13.280 Let's just make it maybe as one. 06:13.280 --> 06:18.140 And then let's take the player and drag this material on the collider. 06:18.440 --> 06:20.120 And let's go back to the play mode. 06:21.790 --> 06:24.400 And now we can see ball is jumping. 06:24.430 --> 06:25.090 Very cool. 06:25.090 --> 06:25.720 Right. 06:25.990 --> 06:28.450 We can take the platform and play tennis. 06:29.930 --> 06:30.590 You. 06:31.760 --> 06:32.150 You. 06:34.120 --> 06:34.480 Yeah. 06:34.480 --> 06:42.040 So this is how you use components and components properties to change behavior of game objects. 06:42.040 --> 06:43.360 I'm going to delete this material. 06:43.360 --> 06:44.230 We don't need it anymore. 06:44.230 --> 06:45.640 It was just an example. 06:45.640 --> 06:47.500 And remove it from here. 06:48.280 --> 06:53.590 Now these are components that are predefined by unity and we're going to use them a lot. 06:53.620 --> 06:57.910 You can also make custom components and that is very easy to achieve. 06:57.940 --> 07:04.060 We can create C sharp script let's call it player for example. 07:04.060 --> 07:10.480 And with the help of this custom script we can adjust behavior of the object just as we want. 07:10.510 --> 07:15.700 We're going to talk more about basics of programming later on in the course, but for now, let's just 07:15.700 --> 07:16.300 try this. 07:16.300 --> 07:18.370 Let's put the script on the player. 07:19.070 --> 07:21.380 And in the player over here. 07:22.270 --> 07:26.230 And in the player over here, let's type a couple of lines of code. 07:26.260 --> 07:29.260 I promise to you I will explain more in the next video. 07:29.260 --> 07:31.540 As of now, just type after me okay. 07:31.540 --> 07:40.690 So let's do public rigidbody 2d, RB and then in the update over here let's do RB dot velocity equals 07:40.690 --> 07:42.580 to new vector two. 07:42.610 --> 07:46.360 Then we're going to type input get access row. 07:47.090 --> 07:48.560 Horizontal. 07:50.260 --> 07:53.290 And RB velocity dot y just like that. 07:53.290 --> 07:57.550 Only that we need to type type it here, save it. 07:57.550 --> 07:59.620 Then let's go back to unity. 08:04.660 --> 08:08.410 And let's assign rigid body in this field like so. 08:08.410 --> 08:14.380 So now we have a custom component of a player that is responsible for control of the rigid body that 08:14.380 --> 08:16.000 we also have on the player. 08:16.000 --> 08:21.460 And you might see in just now we took RB that we just assigned. 08:21.550 --> 08:22.510 So. 08:24.820 --> 08:30.310 So now this rigid body is basically equals to this rigid body which is. 08:31.670 --> 08:35.480 This rigid body that was created and this rigid body that was controlled. 08:35.480 --> 08:36.050 Right. 08:36.050 --> 08:43.820 And now if we go to play mode and press left or right, we can see how ball moves to the left or to 08:43.820 --> 08:44.510 the right. 08:45.930 --> 08:47.490 Just simple as that. 08:47.490 --> 08:51.510 So this is a great example on how games are made in unity. 08:51.510 --> 08:57.780 You just make a game object, you give it different components, and then you make some custom script 08:57.990 --> 08:59.850 change the behavior of the component. 08:59.850 --> 09:01.920 And basically you have a game. 09:01.920 --> 09:03.780 And now it's a very simple example. 09:03.780 --> 09:08.970 And of course it's a bit more complex than that if you want to make like a playable video game. 09:08.970 --> 09:10.800 But as of now, this is just it. 09:10.800 --> 09:11.760 This is very good. 09:11.760 --> 09:16.050 Now you can see how different components can affect different game objects. 09:16.050 --> 09:17.940 And this is what we're going to do in the future. 09:17.940 --> 09:23.700 Now let's go to the next video and we're going to discuss scripting and basics of C sharp okay I'll 09:23.700 --> 09:24.180 see you there.