1 00:00:03,930 --> 00:00:06,140 Well game is now coming along nicely. 2 00:00:06,150 --> 00:00:09,340 We can dodge the enemies, and if we hit them, we die. 3 00:00:09,360 --> 00:00:14,490 But now let's step it up a notch by adding some projectiles so we can both shoot at the enemies and 4 00:00:14,490 --> 00:00:16,050 they can shoot back us. 5 00:00:16,740 --> 00:00:21,690 Before we start coding up this system, though, there's a little bit of prep work we need to do beforehand. 6 00:00:21,690 --> 00:00:26,490 The first thing we want to do is to create some projectiles that we can instantiate into our world. 7 00:00:26,700 --> 00:00:33,090 So over in our hierarchy, let's right click and create a new empty game object and call this the projectile. 8 00:00:33,570 --> 00:00:34,830 Let's reset the transform. 9 00:00:34,830 --> 00:00:40,740 If it didn't come in at 000 and then underneath this object, we're going to add our sprite. 10 00:00:40,980 --> 00:00:43,920 We have a whole bunch of sprites in our assets pack folder. 11 00:00:43,920 --> 00:00:49,710 So if we dig through into the PNG folder and then into lasers, we have a few options here. 12 00:00:49,710 --> 00:00:53,310 We have a whole bunch of blue lasers, green lasers and red lasers. 13 00:00:53,310 --> 00:00:59,100 But because our player is predominantly blue, I'm going to go with one of the blue options and I quite 14 00:00:59,100 --> 00:01:04,290 like the look of this laser blue oh seven So I'm going to drag that underneath my projectile. 15 00:01:04,739 --> 00:01:10,680 This is pretty small in our game world, so let's scale it up a bit and I'm going to go with twice the 16 00:01:10,680 --> 00:01:11,040 size. 17 00:01:11,040 --> 00:01:14,010 So just scale that up to two on the X, Y and Z. 18 00:01:14,400 --> 00:01:18,960 And then if we head back to the root of this object, we need to think about some of the components 19 00:01:18,960 --> 00:01:20,220 we're going to want to add. 20 00:01:20,460 --> 00:01:24,570 Well, this projectile needs to be able to interact with our enemies in the world. 21 00:01:24,570 --> 00:01:27,840 So we're going to be setting this up as a trigger collider. 22 00:01:27,960 --> 00:01:34,530 This means we're going to need a rigid body, 2D, and just like our other objects, let's set that 23 00:01:34,530 --> 00:01:36,120 to be kinematic. 24 00:01:36,480 --> 00:01:40,770 And we're also going to need a type of collider given the shape of our projectile. 25 00:01:40,770 --> 00:01:46,920 I think a capsule collider two DX will do the job and if we zoom in on our projectile, then we can 26 00:01:46,920 --> 00:01:50,610 go ahead and edit the collider to fit our projectile. 27 00:01:51,300 --> 00:01:53,130 So let's just drag in our handles. 28 00:01:53,130 --> 00:01:57,570 And if you're wondering how I'm managing to do both sides at the same time, just need to hold out the 29 00:01:57,570 --> 00:01:58,800 alt key for that. 30 00:01:58,890 --> 00:02:05,070 With that looking about right, the last component we want to add is going to be our damage data because 31 00:02:05,070 --> 00:02:09,720 our player projectiles are going to need to be able to damage the enemies and the enemy projectiles, 32 00:02:09,720 --> 00:02:11,280 which will be very similar to this. 33 00:02:11,280 --> 00:02:12,870 We'll need to damage our player. 34 00:02:13,290 --> 00:02:16,230 Let's leave the default damage at ten for now. 35 00:02:16,680 --> 00:02:20,310 And with all of that set up, we can go ahead and prefab our projectile. 36 00:02:22,520 --> 00:02:25,970 But it's just drag that over into our Prefabs folder. 37 00:02:26,450 --> 00:02:32,870 And I'm actually going to rename this prefab projectile player because now we're going to create a second 38 00:02:32,870 --> 00:02:34,280 one for the enemy. 39 00:02:34,430 --> 00:02:38,360 And this really is as simple as duplicating our prefab with control. 40 00:02:38,360 --> 00:02:42,590 DX And then let's rename this to Projectile Enemy. 41 00:02:43,440 --> 00:02:49,320 If we open up this projector, we're going to want to change our laser blue prefab to one that suits 42 00:02:49,320 --> 00:02:50,400 our enemies. 43 00:02:51,410 --> 00:02:55,190 So let's head back into our asset packs into the lasers folder. 44 00:02:56,030 --> 00:03:01,340 And for this one, I'm going to use the same type of laser, but I'm going to go with the laser red 45 00:03:01,490 --> 00:03:02,090 seven. 46 00:03:03,070 --> 00:03:08,710 So let's drag that in, delete our blue prefab and then rescale our red one. 47 00:03:09,160 --> 00:03:13,300 And since we duplicated our original projectile, we don't have to worry about setting up all of the 48 00:03:13,300 --> 00:03:15,550 colliders and the damage data. 49 00:03:15,820 --> 00:03:19,630 One thing I am noticing, though, is that the colliders should be triggers. 50 00:03:19,630 --> 00:03:23,200 So let's actually go ahead and just fix that on both of our objects. 51 00:03:23,440 --> 00:03:26,380 So is trigger on our enemy projectile? 52 00:03:28,560 --> 00:03:33,030 And if we jump into our projectile, we can set this to a trigger as well. 53 00:03:33,480 --> 00:03:36,120 So that's our projectile mostly set up. 54 00:03:36,120 --> 00:03:40,800 But if we do leave it like this, we're going to run into a bit of a problem when we start instantiating 55 00:03:40,800 --> 00:03:41,970 them via the code. 56 00:03:42,420 --> 00:03:47,520 And to show you what I mean, let's go ahead and hit play and then pause very quickly. 57 00:03:47,970 --> 00:03:52,440 And if we move our projectile around, so let's zoom out so we can see the full level. 58 00:03:54,300 --> 00:03:56,850 And move all projectile out of the way of the enemies. 59 00:03:57,300 --> 00:04:03,390 If we unpause our game, our projectile can actually interact and hit our player. 60 00:04:03,480 --> 00:04:07,320 This deletes our projectile from the scene and damages our player. 61 00:04:07,590 --> 00:04:09,540 And this definitely isn't what we want. 62 00:04:09,570 --> 00:04:15,150 We only want the player projectiles to interact with the enemies and the enemy, projectiles to interact 63 00:04:15,150 --> 00:04:16,140 with the player. 64 00:04:16,170 --> 00:04:18,329 So how do we go about doing this? 65 00:04:18,540 --> 00:04:22,760 Well, the first step is to set these objects to be on specific layers. 66 00:04:22,770 --> 00:04:28,050 So if we click on any object in our scene, we can see up in the top of the inspector that they're all 67 00:04:28,050 --> 00:04:29,430 on layer default. 68 00:04:29,460 --> 00:04:33,780 If we click on this dropdown and then head to the bottom add layer option. 69 00:04:33,930 --> 00:04:37,280 What we're going to do is we're going to set up two new layers. 70 00:04:37,290 --> 00:04:40,620 We're going to sell one for the player and one for the enemy. 71 00:04:40,920 --> 00:04:45,060 With those two sets up, let's click out of our inspector so that that disappears. 72 00:04:45,300 --> 00:04:51,870 And now in our prefabs folder, let's select our enemy and our enemy projectile and set both of their 73 00:04:51,870 --> 00:04:53,880 layers to be the enemy layer. 74 00:04:54,450 --> 00:04:59,160 This will give us a warning message asking whether we want to change the children or just the parent. 75 00:04:59,190 --> 00:05:01,320 Let's go ahead and change the children as well. 76 00:05:01,770 --> 00:05:05,550 And then we want to do the exact same thing for our player and our player projectile. 77 00:05:05,910 --> 00:05:09,660 But this time we're going to set our layer to be the player layer. 78 00:05:10,020 --> 00:05:12,330 Again, we can go ahead and change the children. 79 00:05:12,570 --> 00:05:18,810 And the reason we want to do this is because we can tell unity what objects should interact with each 80 00:05:18,810 --> 00:05:20,340 other based on their layer. 81 00:05:20,340 --> 00:05:25,860 So we can tell the player projectile not to interact with our player ship and we can tell the enemies 82 00:05:25,860 --> 00:05:27,630 not to interact with each other as well. 83 00:05:27,960 --> 00:05:32,990 To do this, we need to head up to edit and then down to product settings. 84 00:05:33,000 --> 00:05:35,790 And on the left side, we have physics to. 85 00:05:36,270 --> 00:05:40,770 Now we also have a physics option as well, which has some very similar stuff in there. 86 00:05:40,800 --> 00:05:44,730 But because our project is 2D, we want the physics 2D option. 87 00:05:45,180 --> 00:05:50,250 Then if we scroll to the bottom of this list, we'll find the layer collision matrix. 88 00:05:50,250 --> 00:05:54,900 If you can't see that, then just expand this option and then scroll down a little bit. 89 00:05:55,230 --> 00:06:00,090 And this collision matrix here tells Unity which layers are allowed to interact with each other. 90 00:06:00,270 --> 00:06:04,350 And there's various different reasons why you might want to change things in here depending on the project 91 00:06:04,350 --> 00:06:05,250 you're working on. 92 00:06:05,250 --> 00:06:10,560 But we said that we didn't want the player projectiles to interact with our player ship and the enemies 93 00:06:10,560 --> 00:06:12,120 to interact with each other as well. 94 00:06:12,540 --> 00:06:18,150 So in this matrix, we want to say that the enemy can interact with the player, but it can't interact 95 00:06:18,150 --> 00:06:23,190 with other enemies, and the player can interact with things on the enemy layer, but it can't interact 96 00:06:23,190 --> 00:06:25,140 with other things on the player layer. 97 00:06:25,470 --> 00:06:30,780 With those options set, we've also fixed another minor bug that was in our game before. 98 00:06:30,810 --> 00:06:35,730 You may or may not have noticed this depending on how you set up your waves, but after we added our 99 00:06:35,730 --> 00:06:40,620 damage data and our health system, it turns out that the enemy could collide with another enemy and 100 00:06:40,620 --> 00:06:41,460 destroy each other. 101 00:06:41,460 --> 00:06:44,400 So this will also fix little problems like that. 102 00:06:44,430 --> 00:06:49,710 With that set, let's close our project settings and now let's test this out to show that it actually 103 00:06:49,710 --> 00:06:50,370 works. 104 00:06:50,400 --> 00:06:52,470 Let's move our projectile and hit play. 105 00:06:52,860 --> 00:06:57,000 And now if we drag our projectile over our player, nothing happens. 106 00:06:57,000 --> 00:07:02,370 But if we interact with an enemy, then the projectile gets destroyed and the enemy will take some damage. 107 00:07:02,400 --> 00:07:08,310 Next, you may or may not have seen something odd, so let's go ahead and hit play again and notice 108 00:07:08,310 --> 00:07:13,320 that when we move the projectile over the player, the projectile is on top of the player. 109 00:07:13,350 --> 00:07:18,630 This looks a bit strange and we really want the projectile to be instantiated underneath our ships rather 110 00:07:18,630 --> 00:07:19,800 than on top of them. 111 00:07:19,800 --> 00:07:23,790 So have a very quick think about how you might go about fixing this. 112 00:07:26,290 --> 00:07:26,760 Okay. 113 00:07:26,770 --> 00:07:28,130 I'm not going to give you too long. 114 00:07:28,150 --> 00:07:34,210 What we're going to do is in our projectiles, if we head down to our sprite, we want to make sure 115 00:07:34,210 --> 00:07:36,940 that the projectiles are on our order. 116 00:07:36,940 --> 00:07:37,720 Zero. 117 00:07:37,750 --> 00:07:41,350 This should be the case by default, but let's double check both of them. 118 00:07:41,620 --> 00:07:46,450 And to make sure that these appear underneath our ships, all we need to do is bump up the order in 119 00:07:46,450 --> 00:07:47,740 layer for our ships. 120 00:07:48,100 --> 00:07:54,070 So let's head into our enemy ship and change the layer in order to one and then head into our player 121 00:07:54,070 --> 00:07:58,480 ship and again, change the sprite order in layer to one. 122 00:07:59,770 --> 00:08:01,870 Now, if we hit play one more time. 123 00:08:03,420 --> 00:08:10,320 If we zoom in on our player and move our projectile, we'll now see that the projectile appears beneath 124 00:08:10,320 --> 00:08:11,160 the player. 125 00:08:11,550 --> 00:08:16,380 So when we eventually get around to instantiating this in code in the next lecture, the projectile 126 00:08:16,380 --> 00:08:21,480 will appear underneath the player and then shoot out and eventually hit an enemy. 127 00:08:22,330 --> 00:08:25,500 So that's our projectile pretty much sets up. 128 00:08:25,510 --> 00:08:30,490 We can go ahead and delete our prefab from our hierarchy because we're going to instantiate those in 129 00:08:30,490 --> 00:08:31,780 code in the next lecture. 130 00:08:31,930 --> 00:08:36,909 But before we finish up, there is one more thing that I want to do, and that is to just tweak our 131 00:08:36,909 --> 00:08:39,030 input system ever so slightly. 132 00:08:39,039 --> 00:08:44,800 So if we head over into the input system folder and open up our input actions, what we're going to 133 00:08:44,800 --> 00:08:47,080 do is have a look at the firing action. 134 00:08:47,260 --> 00:08:52,330 If you remember, all of this was kind of set up by default when we first added our input system and 135 00:08:52,330 --> 00:08:54,430 we didn't really touch much in here. 136 00:08:54,430 --> 00:09:00,700 But if we have a look at our firing action and then expand this dropdown to see which buttons and inputs 137 00:09:00,700 --> 00:09:06,160 are attached to it, we'll say that we have a left mouse button option so we can fire when we click 138 00:09:06,160 --> 00:09:07,060 the left mouse button. 139 00:09:07,060 --> 00:09:09,670 But there's currently no keyboard binding in here. 140 00:09:09,670 --> 00:09:14,440 And for our game, I think it would be nice if we had something like the space bar set up for firing 141 00:09:14,950 --> 00:09:15,610 to do this. 142 00:09:15,610 --> 00:09:21,910 All we need to do is click on the plus icon for our fire action, click on Add Binding and this will 143 00:09:21,910 --> 00:09:24,400 add a blank binding to the bottom of our list. 144 00:09:24,790 --> 00:09:29,830 Then over in the properties window we need to set up the path, which is the key that we're going to 145 00:09:29,830 --> 00:09:30,940 be listening for. 146 00:09:31,240 --> 00:09:33,370 And we could find it in this list in here. 147 00:09:33,370 --> 00:09:38,650 We could dig through our keyboard and find the spacebar, or we can just hit and listen, press the 148 00:09:38,650 --> 00:09:41,140 spacebar, and then it comes up in our list. 149 00:09:41,140 --> 00:09:47,260 So let's select our spacebar for our path, and we can also select keyboard and mouse to tell our input 150 00:09:47,260 --> 00:09:51,070 actions that this is to be used with the keyboard and mouse control scheme. 151 00:09:51,430 --> 00:09:58,030 With that set up, the final change that we want to make is if we click on the fire action again and 152 00:09:58,030 --> 00:10:02,530 look over in the properties, we can see that it's got an action type of being a button. 153 00:10:02,530 --> 00:10:07,630 And the way this action type is going to work is that when we hit our spacebar to fire, it's going 154 00:10:07,630 --> 00:10:09,640 to register the key down event. 155 00:10:09,640 --> 00:10:13,060 However, it isn't going to register the key up event. 156 00:10:13,060 --> 00:10:17,470 And for our firing action, we're really going to need that key up event so that we can tell the game 157 00:10:17,470 --> 00:10:18,790 when to stop firing. 158 00:10:19,210 --> 00:10:22,930 So instead, let's change the action type to be of type value. 159 00:10:22,960 --> 00:10:25,960 This is the same action type as our MOVE action. 160 00:10:25,960 --> 00:10:31,180 And remember that this triggers both when we press the key down and when we lift the key up. 161 00:10:31,180 --> 00:10:37,150 So we can now use that information to tell if the key is down and should be firing or not without input 162 00:10:37,150 --> 00:10:38,110 action sorted. 163 00:10:38,110 --> 00:10:43,540 Let's go ahead and save our asset and do remember to save unless you have the autosave option checked 164 00:10:43,540 --> 00:10:46,780 and then close our asset window with that set up. 165 00:10:46,780 --> 00:10:50,200 We're now in a very good place to start coding up our shooting behavior. 166 00:10:50,590 --> 00:10:55,600 And whilst it may seem like we didn't really get too much done in this lecture, we actually set up 167 00:10:55,600 --> 00:11:00,880 a lot of groundwork and saved ourselves a lot of potential headaches and bugs going forward. 168 00:11:00,880 --> 00:11:04,450 And in the next lecture, we're going to start generating these projectiles at runtime. 169 00:11:04,750 --> 00:11:06,100 So I'll see you there.