1 00:00:04,160 --> 00:00:09,500 In this lecture, we're going to be making a level manager to allow us to connect up our three different 2 00:00:09,500 --> 00:00:10,190 scenes. 3 00:00:11,390 --> 00:00:15,940 Now the first step in doing this is to do a little bit of extra set up in unity. 4 00:00:15,950 --> 00:00:22,550 So if we head up to file and then down to build settings, we can see at the top here we've got this 5 00:00:22,550 --> 00:00:24,460 scenes in our build file. 6 00:00:24,470 --> 00:00:29,440 By default, this will already include the scene that came with creating the project itself. 7 00:00:29,450 --> 00:00:35,450 This is usually called sample scene, but remember we renamed ours to Gain and we can see in this list 8 00:00:35,450 --> 00:00:41,300 we have the same name on the left and we also have a build index on the right. 9 00:00:41,570 --> 00:00:47,030 Now, since we've added some additional scenes for our main menu and our game over screen, we're going 10 00:00:47,030 --> 00:00:53,270 to need to add these to our build queue so we can do this by just dragging over the scenes into this 11 00:00:53,270 --> 00:00:56,180 list and we can see that over on the right. 12 00:00:56,180 --> 00:00:58,850 They've been given their own unique build index. 13 00:00:59,090 --> 00:01:03,980 Our scenes aren't currently in the correct order for us though, because when we start a unity game, 14 00:01:03,980 --> 00:01:08,180 once we've built everything, it will always load the index 0/1. 15 00:01:08,180 --> 00:01:13,040 So we're going to need to reorder the elements of our list and put the main menu first. 16 00:01:13,070 --> 00:01:14,420 That's incredibly easy. 17 00:01:14,420 --> 00:01:16,760 We just need to click and drag. 18 00:01:16,760 --> 00:01:21,170 Once we've done this, we'll notice that the build indexes have all changed. 19 00:01:21,410 --> 00:01:23,930 With that set, we can now close this window down. 20 00:01:23,930 --> 00:01:27,890 We don't have to hit any of the buttons at the bottom, just the X at the top. 21 00:01:28,130 --> 00:01:30,500 And now let's create a new level manager. 22 00:01:30,500 --> 00:01:34,940 So over in the hierarchy, this is going to be a game object that exists in the world. 23 00:01:34,940 --> 00:01:40,370 So let's create an empty object called Level Manager and we'll reset the transform. 24 00:01:40,790 --> 00:01:44,660 Then over in our scripts folder, let's create a level manager script. 25 00:01:44,660 --> 00:01:50,690 So right click, create new C-sharp script and call this the level manager and then we'll drag that 26 00:01:50,690 --> 00:01:52,250 onto our game object. 27 00:01:52,250 --> 00:01:56,630 Finally, let's open this script up and start doing some coding for this script. 28 00:01:56,630 --> 00:02:02,150 We're not going to need our start and our update method, but what we are going to need is at the very 29 00:02:02,150 --> 00:02:09,560 top of our script, we're going to have to include using unity engine scene management and that will 30 00:02:09,560 --> 00:02:13,430 allow us to start loading scenes in our script with that set. 31 00:02:13,430 --> 00:02:16,910 Now let's look at how we're going to load our new scene in code. 32 00:02:16,910 --> 00:02:22,010 And to start with, let's look at loading the game scene so we can attach that to the play button on 33 00:02:22,010 --> 00:02:22,940 our main menu. 34 00:02:22,940 --> 00:02:25,100 So we're going to want some public methods. 35 00:02:25,310 --> 00:02:30,980 These are not going to return anything and we'll call this first one load gang in here. 36 00:02:30,980 --> 00:02:37,610 We want to take our scene manager, which comes with our scene management package, dot load scene. 37 00:02:38,030 --> 00:02:42,650 And if we take a look at the tooltip, we'll see that there's a whole bunch of overloaded versions of 38 00:02:42,650 --> 00:02:43,550 this method. 39 00:02:43,550 --> 00:02:49,190 However, it really comes down to whether you want to load your scene by name or by build index. 40 00:02:49,190 --> 00:02:51,230 So we have two real options there. 41 00:02:51,380 --> 00:02:57,320 So to load our game scene, we may want to pass in the build index of one because remember it was the 42 00:02:57,320 --> 00:03:03,740 second item in our scene list, or we could reference it by name so we could just write in the name 43 00:03:03,740 --> 00:03:07,280 of the scene for simplicity and readability of our code. 44 00:03:07,280 --> 00:03:12,650 I think we'll stick with the string reference for now and that is pretty much the end of this method, 45 00:03:12,650 --> 00:03:16,280 which I think would bring us nicely on to your first challenge. 46 00:03:16,940 --> 00:03:20,540 I would like you to write a couple of extra public methods. 47 00:03:20,540 --> 00:03:26,540 The first one will load the main menu and the second will load the game over scene. 48 00:03:26,540 --> 00:03:29,480 So pause the video now and give that go. 49 00:03:34,900 --> 00:03:35,350 Okay. 50 00:03:35,350 --> 00:03:36,050 Welcome back. 51 00:03:36,070 --> 00:03:38,460 So hopefully you got on well with that first challenge. 52 00:03:38,470 --> 00:03:44,470 So for our first method, we can make a public void called load main menu. 53 00:03:46,090 --> 00:03:51,580 And this is going to take our scene manager load scene of our main menu. 54 00:03:52,480 --> 00:03:56,620 Then for our second method, we want a public void called load. 55 00:03:56,620 --> 00:04:04,960 Game over and this will take our scene manager load scene of our game over scene. 56 00:04:05,470 --> 00:04:07,630 So hopefully that was pretty straightforward. 57 00:04:07,630 --> 00:04:12,240 But before we finish up our level manager script, there's one more thing we need to do in here. 58 00:04:12,250 --> 00:04:16,110 Remember that on our main menu we also have a quit button. 59 00:04:16,120 --> 00:04:19,269 So let's add that functionality into this script as well. 60 00:04:19,510 --> 00:04:26,680 For this, we can have another public void method called Quit Game and quit out of a unity game. 61 00:04:26,680 --> 00:04:29,950 We need to say application dot quit. 62 00:04:30,550 --> 00:04:36,040 Now this is a pretty hard way of quitting out of an application and depending on your platform, it 63 00:04:36,040 --> 00:04:38,500 may or may not work as intended. 64 00:04:38,530 --> 00:04:42,520 If you've got a normal standalone build for your game, then this should be fine. 65 00:04:42,520 --> 00:04:46,130 But if you're using a WebGL build then application quit. 66 00:04:46,210 --> 00:04:50,140 Won't do anything because you can't quit out of an embedded web page. 67 00:04:50,140 --> 00:04:54,790 And if you're working on mobile, then there may be a couple of other things you want to do in here 68 00:04:54,790 --> 00:04:57,610 before just hard exiting the application. 69 00:04:57,850 --> 00:05:04,180 And because we won't see this working in our editor, let's also add a debug log in here just to let 70 00:05:04,180 --> 00:05:06,520 us know that we're quitting the game. 71 00:05:07,090 --> 00:05:10,750 So with that set, let's save our script and jump over into Unity. 72 00:05:11,320 --> 00:05:14,860 And now let's start thinking about how to connect this level manager up. 73 00:05:15,160 --> 00:05:19,660 Well, the first thing we probably want to do is prefab our level manager, because this is going to 74 00:05:19,660 --> 00:05:24,520 have to exist in all of our different scenes, kind of like our audio player is at the moment. 75 00:05:24,970 --> 00:05:30,760 So let's drop that into our prefabs folder and then let's connect our start and our quit button on our 76 00:05:30,760 --> 00:05:31,570 main menu. 77 00:05:31,960 --> 00:05:36,550 If we click on our buttons and scroll down, we can add an on click event. 78 00:05:36,790 --> 00:05:38,320 So let's add the plus icon. 79 00:05:38,320 --> 00:05:41,770 To add an event, let's drag over our level manager. 80 00:05:41,770 --> 00:05:46,270 And then in the dropdown menu we can click on level manager and then load game. 81 00:05:46,270 --> 00:05:48,520 And for our quit button it's very similar. 82 00:05:48,520 --> 00:05:53,860 We're going to add an on click event, drag over our level manager and this time we're going to go to 83 00:05:53,860 --> 00:05:56,050 level manager and then quit game. 84 00:05:56,260 --> 00:06:01,660 So before we set up the other scenes in our game, let's click on play just to see this in action. 85 00:06:02,870 --> 00:06:08,060 So if we look at our console and hit the quit button, then we get our quitting game message. 86 00:06:08,510 --> 00:06:11,660 And if we hit the start button, then we load into our game. 87 00:06:11,990 --> 00:06:13,760 Now, from here, nothing is going to happen. 88 00:06:13,760 --> 00:06:16,160 So when we die, we're just going to die. 89 00:06:16,400 --> 00:06:21,590 So the next steps are going to be to call our level manager from our health script when our player dies 90 00:06:21,590 --> 00:06:24,290 and also connect up our game over screen. 91 00:06:24,500 --> 00:06:27,050 So let's look at our health script first. 92 00:06:27,230 --> 00:06:31,460 And since we're going to need to add a level manager to our game scene, let's load that up. 93 00:06:31,580 --> 00:06:34,400 Remember to save your scene before changing. 94 00:06:34,970 --> 00:06:40,430 And with that loaded, let's drag in our level manager and then open up our health script. 95 00:06:41,310 --> 00:06:41,820 In here. 96 00:06:41,820 --> 00:06:45,390 We're going to start by finding a reference to our level manager. 97 00:06:45,480 --> 00:06:49,380 So let's say level manager and we'll call it the level manager. 98 00:06:50,490 --> 00:06:53,670 In awake we can find our object in the scene. 99 00:06:53,670 --> 00:06:58,470 So we have level manager equals find object of type level manager. 100 00:06:59,830 --> 00:07:05,980 And then down in our die method where we're processing what happens when something dies, we're checking 101 00:07:05,980 --> 00:07:08,860 if we're not the player and then modifying our school. 102 00:07:08,860 --> 00:07:11,470 But if we are the player, so else. 103 00:07:12,130 --> 00:07:14,170 We won't say level manager. 104 00:07:14,620 --> 00:07:16,090 Load game over. 105 00:07:16,450 --> 00:07:20,230 And now when we run out of health, it will load us into our game over menu. 106 00:07:20,320 --> 00:07:26,410 This now brings us onto a second challenge for you, and that is to connect the menu buttons in the 107 00:07:26,410 --> 00:07:27,670 game overseen. 108 00:07:27,670 --> 00:07:32,770 So you take what we learnt from connecting up the main menu and apply it to our game over menu. 109 00:07:32,800 --> 00:07:34,930 Pause the video now and give that a go. 110 00:07:40,490 --> 00:07:40,940 Okay. 111 00:07:40,940 --> 00:07:41,820 Welcome back. 112 00:07:41,840 --> 00:07:43,430 So here I am in our game. 113 00:07:44,360 --> 00:07:50,090 The first thing I want to do is drag over my level manager into the scene and then on my canvas. 114 00:07:50,090 --> 00:07:56,780 We just need to go to our button group, click on our replay button, scroll down to our on click event, 115 00:07:57,110 --> 00:08:03,890 add a new event, drag our level manager over, and then in the dropdown we want level manager dot load 116 00:08:03,890 --> 00:08:06,620 game because we want to reload the game scene. 117 00:08:07,470 --> 00:08:10,110 And then on our main menu button, same process. 118 00:08:10,110 --> 00:08:16,470 So add an event, drag over our level manager and then in our dropdown we want to load the main menu. 119 00:08:16,980 --> 00:08:22,440 So with that all set up, our game should have a nice flow between the different states of our game 120 00:08:22,710 --> 00:08:25,050 if we jump back to our main menu scene. 121 00:08:25,050 --> 00:08:26,790 So we can start from the beginning. 122 00:08:27,300 --> 00:08:33,870 If we go ahead and hit play, we can now start our game and play as we normally would. 123 00:08:33,990 --> 00:08:42,960 And if we take enough damage and die, then we load into our game overseeing and we can either hit our 124 00:08:42,960 --> 00:08:44,490 main menu or play again. 125 00:08:44,490 --> 00:08:48,600 And I would encourage you to go through all of the different combinations to make sure everything's 126 00:08:48,600 --> 00:08:49,470 connected up. 127 00:08:49,470 --> 00:08:54,450 But one problem with this scene is that our score is not being transferred over to our game scene. 128 00:08:54,520 --> 00:08:58,020 That's still on our to do list to fix and listen to the music. 129 00:08:58,020 --> 00:09:04,380 When we change our scene, it skips and starts again and it would be really nice if it would continuously 130 00:09:04,380 --> 00:09:06,450 play throughout those scene transitions. 131 00:09:06,720 --> 00:09:12,330 The final problem that we're going to fix in this particular lecture is that when we die, we instantly 132 00:09:12,330 --> 00:09:17,400 get teleported to the game over screen, and it would probably be nice to have a little moment of pause 133 00:09:17,400 --> 00:09:18,780 before that happens. 134 00:09:18,780 --> 00:09:20,490 So let's come out of play mode. 135 00:09:20,520 --> 00:09:23,610 Let's go into our level manager and open up our script. 136 00:09:23,940 --> 00:09:28,950 And I want you to have a think about how we might delay loading this game over. 137 00:09:30,870 --> 00:09:31,530 Okay. 138 00:09:31,530 --> 00:09:35,190 So if you answered a CO routine, then you would be right. 139 00:09:35,310 --> 00:09:42,510 So let's add a CO routine to our level manager so we can delay the loading of this game over at the 140 00:09:42,510 --> 00:09:43,070 bottom. 141 00:09:43,080 --> 00:09:50,580 Let's create an AI enumerator for our CO routine and we'll call this weight and load and to make this 142 00:09:50,580 --> 00:09:51,870 as generic as possible. 143 00:09:51,870 --> 00:09:57,960 In case we want to add more scenes with a load delay, let's pass in a string reference for our scene 144 00:09:57,960 --> 00:10:02,580 name and a float for the amount of delay we want to wait. 145 00:10:03,900 --> 00:10:09,510 And this method is really going to be as simple as waiting for the delay time and then loading the new 146 00:10:09,510 --> 00:10:18,120 thing so we can say yield return new wait 4 seconds and the seconds we want to wait is the delay. 147 00:10:18,570 --> 00:10:25,440 And then once that time has elapsed, we can take our scene manager load scene and we want to load our 148 00:10:25,440 --> 00:10:26,340 scene name. 149 00:10:26,430 --> 00:10:30,270 So with that set, let's change our load game over. 150 00:10:30,300 --> 00:10:37,350 And rather than calling load seen here, let's call, start counting, wait and load passing in the 151 00:10:37,350 --> 00:10:42,690 scene name and then rather than hard coding of value in here, let's pass in a variable name. 152 00:10:42,690 --> 00:10:49,110 So add this to the top of our script in just a moment, but let's call this one scene load delay. 153 00:10:49,650 --> 00:10:53,520 This is going to give us some red squiggly because our variable doesn't exist yet. 154 00:10:53,520 --> 00:10:56,400 So let's copy this name and go right to the top. 155 00:10:56,400 --> 00:11:01,800 And let's create a serialized field of type float and call it the scene load delay. 156 00:11:01,980 --> 00:11:05,760 And let's maybe give this a default value of 2 seconds. 157 00:11:06,000 --> 00:11:09,630 We're still getting a red squiggly and well done if you've spotted that. 158 00:11:09,630 --> 00:11:11,850 I've missed a closing parenthesis. 159 00:11:12,330 --> 00:11:15,270 So now let's go back to Unity and test this out. 160 00:11:15,450 --> 00:11:20,550 And if we click on our level manager, we can now see we've got this variable available to us now to 161 00:11:20,550 --> 00:11:26,760 be very careful editing this value because it does only apply to this version of the level manager. 162 00:11:26,760 --> 00:11:32,790 So rather than changing things in here, it would be a better option to probably change the prefab version 163 00:11:32,790 --> 00:11:33,750 instead. 164 00:11:33,750 --> 00:11:36,960 But with that warning aside, let's go ahead and hit play and test things out. 165 00:11:38,130 --> 00:11:45,780 We can hit our start button to load our game and if we die from our enemies, then we'll have a short 166 00:11:45,780 --> 00:11:48,380 delay before loading into our game overseeing. 167 00:11:48,840 --> 00:11:52,050 So congratulations on hooking up your level manager. 168 00:11:52,080 --> 00:11:57,900 We now have a very simple way of transitioning between our various scenes with that set. 169 00:11:57,900 --> 00:12:03,030 The next problem we're going to tackle is to get our audio playing continuously throughout the different 170 00:12:03,030 --> 00:12:04,320 scene transitions. 171 00:12:04,320 --> 00:12:06,870 We'll start that in the next lecture, so I'll see you there.