1 00:00:00,590 --> 00:00:08,150 Welcome back my fellow game developers to a brand new ultra exciting video. 2 00:00:08,145 --> 00:00:10,005 We've created bullets previously, 3 00:00:10,005 --> 00:00:11,385 we made them fly, 4 00:00:11,385 --> 00:00:14,295 but now using the power of brief up, 5 00:00:14,295 --> 00:00:15,755 the power of input, 6 00:00:15,750 --> 00:00:17,610 the power of instantiation. 7 00:00:17,610 --> 00:00:19,820 I mean, we've learned so much in this video, 8 00:00:19,815 --> 00:00:24,305 we can start shooting bullets in various directions. 9 00:00:24,300 --> 00:00:26,630 How cool is that? 10 00:00:26,625 --> 00:00:32,495 As you can see, we have multiple bullets shooting from our shotgun. 11 00:00:32,490 --> 00:00:34,910 So let's not waste any more time. 12 00:00:34,905 --> 00:00:37,655 And let's get started. 13 00:00:37,650 --> 00:00:43,210 Oh, okay, so time to start firing hour bullets. 14 00:00:43,205 --> 00:00:47,065 But we want multiple bullets to be fired. 15 00:00:47,060 --> 00:00:49,460 We don't just want to have one bullet. 16 00:00:49,460 --> 00:00:51,110 So what shall we do? 17 00:00:51,110 --> 00:00:54,580 Shall we duplicate this bullet multiple times? 18 00:00:54,575 --> 00:00:57,815 By the way, I'm doing this using Control D. Well, 19 00:00:57,815 --> 00:01:00,755 obviously not, this is not a great idea. 20 00:01:00,755 --> 00:01:05,485 What we need to do is we need to create something called a prefab. 21 00:01:05,480 --> 00:01:07,240 What is a prefix? 22 00:01:07,235 --> 00:01:08,755 Let me show you. 23 00:01:08,750 --> 00:01:11,410 A prefab basically means it's 24 00:01:11,405 --> 00:01:18,655 a previously fabricated game object that we can use multiple times. 25 00:01:18,650 --> 00:01:20,050 There are a lot, 26 00:01:20,045 --> 00:01:23,815 a lot of benefits to having prefabs when it 27 00:01:23,810 --> 00:01:27,770 comes to create new scenes and doing different things. 28 00:01:27,770 --> 00:01:32,140 Let's go over a couple of important things about prefabs. 29 00:01:32,135 --> 00:01:35,935 It's a template for a certain game object. 30 00:01:35,930 --> 00:01:42,350 So just like we have the bullet with its specific components at specific collider, 31 00:01:42,350 --> 00:01:47,840 we can create a prefab out of it and create multiple bullets with the same components, 32 00:01:47,840 --> 00:01:49,070 with the same sprites, 33 00:01:49,070 --> 00:01:51,910 the same collider, et cetera. 34 00:01:51,905 --> 00:01:57,295 Prefab system allows you to store a game object with all its properties. 35 00:01:57,290 --> 00:01:58,880 So just like I said, 36 00:01:58,880 --> 00:02:01,370 you can create a prefab of the bullet and then 37 00:02:01,370 --> 00:02:04,090 create multiple bullets with the same properties, 38 00:02:04,085 --> 00:02:06,395 game components, et cetera. 39 00:02:06,395 --> 00:02:08,815 What do we use it for? 40 00:02:08,810 --> 00:02:13,090 We can reuse a game object configured in a particular way. 41 00:02:13,085 --> 00:02:15,445 Hence the bullet we can create multiple, but let's see, 42 00:02:15,440 --> 00:02:20,050 we'll see how in just a bit we can edit many objects at once. 43 00:02:20,045 --> 00:02:22,985 So for example, let's say we want to make the bullets faster. 44 00:02:22,985 --> 00:02:26,585 Should we go and change all the bullets or every single time? 45 00:02:26,585 --> 00:02:33,305 No, we can change only the prefab and every other form of this prefab will be changed. 46 00:02:33,305 --> 00:02:36,595 We can use the same object in different scenes, 47 00:02:36,590 --> 00:02:40,150 much easier when we start creating multiple levels. 48 00:02:40,145 --> 00:02:43,925 You'll know what I mean by this, and that's it. 49 00:02:43,925 --> 00:02:46,925 So let's go and create a prefab. 50 00:02:46,925 --> 00:02:52,525 Now, the process of creating a Prefabs is extremely, extremely hard. 51 00:02:52,520 --> 00:02:56,080 So be very, put your caps on, 52 00:02:56,075 --> 00:02:58,195 stop everything, and watch what I do. 53 00:02:58,190 --> 00:02:59,770 This is very important. 54 00:02:59,765 --> 00:03:04,775 First of all, we create a folder which is the prefabs. 55 00:03:04,775 --> 00:03:09,715 I'm going to go in here and now I'm going to create a prefab out of this bullet. 56 00:03:09,710 --> 00:03:15,260 So what we must do is we first need to drag this bullet in here. 57 00:03:15,260 --> 00:03:17,440 And that's it. 58 00:03:17,435 --> 00:03:20,285 That is how we create a prefab. 59 00:03:20,285 --> 00:03:23,845 So now what we can do is we can simply drag 60 00:03:23,840 --> 00:03:27,590 this bullet right here and create multiple bullets. 61 00:03:27,590 --> 00:03:29,530 And you can see that bullet three, 62 00:03:29,525 --> 00:03:34,055 Two bullet 1 all have the same components in the inspector. 63 00:03:34,055 --> 00:03:39,545 And you can know that a game object is a prefab by looking at its scholar. 64 00:03:39,545 --> 00:03:42,145 So you can see the background isn't a prefab, 65 00:03:42,140 --> 00:03:46,640 but the player bullet is because it is a bit blue. 66 00:03:46,640 --> 00:03:47,900 So let's say for example, 67 00:03:47,900 --> 00:03:50,770 I want to create a prefab out of the room player. 68 00:03:50,765 --> 00:03:51,595 There we go. 69 00:03:51,590 --> 00:03:57,520 So now the dump layer is a prefab and I can add another and a third one. 70 00:03:57,515 --> 00:03:59,575 And if I run the game, 71 00:03:59,570 --> 00:04:03,640 now we have three doom players walking around the a. 72 00:04:03,635 --> 00:04:05,405 How cool is that? 73 00:04:05,405 --> 00:04:08,515 There you go. We have a cool army. 74 00:04:08,510 --> 00:04:11,990 The Three Musketeers, we'll call them the three. 75 00:04:11,990 --> 00:04:14,810 I'm not sure. Okay. Musketeers, that's enough. 76 00:04:14,810 --> 00:04:19,330 Let's go ahead and delete all the bullets that we have. 77 00:04:19,325 --> 00:04:23,935 We can even delete this original one and we still can add it from our prefabs. 78 00:04:23,930 --> 00:04:28,240 And let's keep the player right here as a prefab. 79 00:04:28,235 --> 00:04:29,645 So very nice. 80 00:04:29,645 --> 00:04:36,235 Now we have everything almost set up and we can start creating, firing the bullets. 81 00:04:36,230 --> 00:04:40,670 So let's go into the player controller and start doing just that. 82 00:04:40,670 --> 00:04:46,160 Now, I'm going to be firing these bullets from the player controller. 83 00:04:46,160 --> 00:04:51,440 But keep in mind later on we will need another script to do the firing for us. 84 00:04:51,440 --> 00:04:53,800 Just a heads up from now. 85 00:04:53,795 --> 00:04:59,545 First of all, I'm going to create a serialized field which is of type game object. 86 00:04:59,540 --> 00:05:02,500 And this will be the reference to the bullet, 87 00:05:02,495 --> 00:05:04,295 or we can call it playable it. 88 00:05:04,295 --> 00:05:05,425 No worries. For now, 89 00:05:05,420 --> 00:05:06,970 let's keep it as bullet. 90 00:05:06,965 --> 00:05:11,105 We are going to need a reference to something called the 91 00:05:11,105 --> 00:05:17,105 transform or the transform fire position. 92 00:05:17,105 --> 00:05:18,635 And why do we need that? 93 00:05:18,635 --> 00:05:22,075 Well, where will our bullet come out from? 94 00:05:22,070 --> 00:05:25,430 So obviously it will come out from our shotgun. 95 00:05:25,430 --> 00:05:28,360 And where is the firing point of the shotgun? 96 00:05:28,355 --> 00:05:30,825 Should it come out from the middle of the shotgun, 97 00:05:30,829 --> 00:05:32,379 that wouldn't be too nice. 98 00:05:32,375 --> 00:05:35,635 What we'll do is we'll add a fire point. 99 00:05:35,630 --> 00:05:38,690 And this fire point will be an empty game object, 100 00:05:38,690 --> 00:05:41,450 which will be a child of the weapons are. 101 00:05:41,450 --> 00:05:46,090 So fire point. 102 00:05:46,085 --> 00:05:48,385 And notice what happens now, 103 00:05:48,380 --> 00:05:51,970 because they don't layer is a prefab. 104 00:05:51,965 --> 00:05:55,765 You will notice that the file bond has a little plus on it. 105 00:05:55,760 --> 00:05:57,010 What does that mean? 106 00:05:57,005 --> 00:05:59,285 If I click on the top layer here, 107 00:05:59,285 --> 00:06:02,645 I can double-click on him and open him up separately. 108 00:06:02,645 --> 00:06:04,405 You'll notice that he does not have 109 00:06:04,400 --> 00:06:08,240 the fire point because the prefab hasn't been adjusted yet. 110 00:06:08,240 --> 00:06:12,410 And you can see it from the color of the fire point and the from the little plus. 111 00:06:12,410 --> 00:06:14,560 So we can go into the do player. 112 00:06:14,555 --> 00:06:16,435 In here we have the override. 113 00:06:16,430 --> 00:06:17,720 If we click down, 114 00:06:17,720 --> 00:06:23,570 you'll notice that things that we've changed but have not applied yet to the prefab. 115 00:06:23,570 --> 00:06:28,960 And you can see that we can either apply the specific thing or we can, can apply all. 116 00:06:28,955 --> 00:06:31,315 So when we hit the apply all, 117 00:06:31,310 --> 00:06:33,740 now, the doom player, 118 00:06:33,740 --> 00:06:34,970 when we double-click on him, 119 00:06:34,970 --> 00:06:36,440 has the fire point, 120 00:06:36,440 --> 00:06:39,740 the prefab of the doom player has also the fire point. 121 00:06:39,740 --> 00:06:45,610 So we'll move the fire point here and front of the shotgun. 122 00:06:45,605 --> 00:06:49,615 But if we add another 11 of the dome players, 123 00:06:49,610 --> 00:06:52,990 you'll notice that the fire point is still in the middle, 124 00:06:52,985 --> 00:06:57,965 while the fire point on the doom player here is in front of the shotgun. 125 00:06:57,965 --> 00:07:03,295 Oh, and also, you can see when I click on the fire point, the transform, 126 00:07:03,290 --> 00:07:06,710 the position has this little blue line and this represents that 127 00:07:06,710 --> 00:07:10,460 we've changed something from the prefab. 128 00:07:10,460 --> 00:07:12,380 So I'll go into the doom player, 129 00:07:12,380 --> 00:07:14,720 click on override and apply all. 130 00:07:14,720 --> 00:07:16,960 But we don't always apply all. 131 00:07:16,955 --> 00:07:19,895 Keep that in mind. When I hit Apply all. 132 00:07:19,895 --> 00:07:22,525 If I go back to the doom player in here, 133 00:07:22,520 --> 00:07:28,210 I select the file pointer and it magically appeared on the end of the shotgun. 134 00:07:28,205 --> 00:07:33,745 So you are beginning to understand how useful a prefab can be 135 00:07:33,740 --> 00:07:39,490 when it comes to modifying multiple elements of prefab that we've created. 136 00:07:39,485 --> 00:07:42,055 Later on. As we move through the course, 137 00:07:42,050 --> 00:07:43,580 we make more complex things. 138 00:07:43,580 --> 00:07:46,220 You'll see how efficient the system is. 139 00:07:46,220 --> 00:07:50,890 For now we'll delete the doom player and let's continue on. 140 00:07:50,885 --> 00:07:53,135 So we have our fire point, 141 00:07:53,135 --> 00:07:54,655 we have our bullet. 142 00:07:54,650 --> 00:07:58,820 The next thing we want to do is we want to start firing 0. 143 00:07:58,820 --> 00:08:02,710 So I've added this in the wrong place, excuse me. 144 00:08:02,705 --> 00:08:06,775 We were working in the player bullet controller and we 145 00:08:06,770 --> 00:08:11,070 should have been working in the layer controller, 146 00:08:11,074 --> 00:08:12,664 not the player bullet controller. 147 00:08:12,665 --> 00:08:13,915 This is a bit confusing. 148 00:08:13,910 --> 00:08:16,360 I didn't notice the player bullet. No worries. 149 00:08:16,355 --> 00:08:18,175 We'll just Control X, 150 00:08:18,170 --> 00:08:20,170 which will cut them from here, 151 00:08:20,165 --> 00:08:22,135 and we'll paste them in here. 152 00:08:22,130 --> 00:08:23,600 Sorry for the confusion. 153 00:08:23,600 --> 00:08:28,390 I apologize for my lack of concentration. 154 00:08:28,385 --> 00:08:29,645 Save that. 155 00:08:29,645 --> 00:08:30,905 Go back. 156 00:08:30,905 --> 00:08:34,195 Now, we'll see that we have a reference to the bullet, 157 00:08:34,190 --> 00:08:37,360 a reference to the file position or fire point, 158 00:08:37,355 --> 00:08:40,385 that should be fire point. 159 00:08:42,100 --> 00:08:45,190 Save that back in our game. 160 00:08:45,185 --> 00:08:48,845 Please don't waste my time and nothing sticks. 161 00:08:48,845 --> 00:08:53,195 Fire point and the bullet will be the assets. 162 00:08:53,195 --> 00:08:54,985 Prefabs. 163 00:08:54,980 --> 00:08:56,960 Drag in the bullet. 164 00:08:56,960 --> 00:08:58,220 And there we go. 165 00:08:58,220 --> 00:09:01,190 We can also apply the changes and here. 166 00:09:01,190 --> 00:09:03,470 So what do we need to do? 167 00:09:03,470 --> 00:09:09,130 We want to, every single time when we press a button, 168 00:09:09,125 --> 00:09:12,385 which will be the left mouse key, 169 00:09:12,380 --> 00:09:15,040 we want to fire a bullet. 170 00:09:15,035 --> 00:09:16,825 So let's do that. 171 00:09:16,820 --> 00:09:19,430 We're going to create a condition and 172 00:09:19,430 --> 00:09:24,470 the update where we check if we press a certain mouse button. 173 00:09:24,470 --> 00:09:27,640 But how if we go into unit is documentations. 174 00:09:27,635 --> 00:09:31,765 We can see that we have an input to get the mouse button down. 175 00:09:31,760 --> 00:09:33,350 If we read the description, 176 00:09:33,349 --> 00:09:37,699 we can see that it returns a true during the frame the user 177 00:09:37,700 --> 00:09:42,310 pressed the given mouse button and we can even see an example in here. 178 00:09:42,305 --> 00:09:46,025 So if input dot get boss button down 0, 179 00:09:46,025 --> 00:09:48,565 we press the primary button, 180 00:09:48,560 --> 00:09:50,630 which will be the left mouse button, 181 00:09:50,630 --> 00:09:53,050 the one as d right mouse button. 182 00:09:53,045 --> 00:09:55,225 And the two is the middle, 183 00:09:55,220 --> 00:09:57,590 which is the little wheel. 184 00:09:57,590 --> 00:09:59,410 So back in here, 185 00:09:59,405 --> 00:10:02,825 I'm going to delete this debug dot log. 186 00:10:02,825 --> 00:10:14,245 I'm going to check if the input dot get mouse button down the 0. 187 00:10:14,240 --> 00:10:16,630 What are we going to do in here? 188 00:10:16,625 --> 00:10:21,205 Well, we want to do something called an instantiation. 189 00:10:21,200 --> 00:10:23,500 What is that? Back? 190 00:10:23,495 --> 00:10:29,585 And Unity's documentation, we can see that we can instantiate an object. 191 00:10:29,585 --> 00:10:31,175 Let's read the description. 192 00:10:31,175 --> 00:10:34,195 It returns an object that instantiated 193 00:10:34,190 --> 00:10:38,270 clothes or we create a clone of the prefab that we have. 194 00:10:38,270 --> 00:10:41,440 Clones the object original and returns the clone. 195 00:10:41,435 --> 00:10:45,415 This function can copy an object similar to the duplicate, etc. 196 00:10:45,410 --> 00:10:47,150 You can read all about it, 197 00:10:47,150 --> 00:10:48,980 and this is how we can use it. 198 00:10:48,980 --> 00:10:51,580 So we can simply instantiate the object, 199 00:10:51,575 --> 00:10:53,675 whatever it is without any addition. 200 00:10:53,675 --> 00:10:59,485 We can instantiate an object and make it a child of a certain parent that we want, 201 00:10:59,480 --> 00:11:01,090 which is very helpful. 202 00:11:01,085 --> 00:11:04,825 We can instantiated in a certain world and space. 203 00:11:04,820 --> 00:11:07,780 We can add position rotation and a parent. 204 00:11:07,775 --> 00:11:10,075 So all of these are very important. 205 00:11:10,070 --> 00:11:14,230 So now that you know how instantiation works, 206 00:11:14,225 --> 00:11:16,795 it's time for a challenge. 207 00:11:16,790 --> 00:11:21,130 And your challenge is going to be to instantiate the bullet prefabs. 208 00:11:21,125 --> 00:11:26,335 So check the example of instantiation in Unity's documentation. 209 00:11:26,330 --> 00:11:32,440 Objects should be or the original object should be the bullet prefab. 210 00:11:32,435 --> 00:11:36,295 Make sure the position is at the five position. 211 00:11:36,290 --> 00:11:40,340 The rotation is also at the five position. 212 00:11:40,340 --> 00:11:43,100 And I'll give you a small hint if you don't need it, 213 00:11:43,100 --> 00:11:44,480 you know how to create. 214 00:11:44,480 --> 00:11:46,090 Go ahead and do the challenge. 215 00:11:46,085 --> 00:11:51,475 If not, to access the position and rotation of the fire point, 216 00:11:51,470 --> 00:11:54,680 use the top position and the rotation. 217 00:11:54,680 --> 00:11:56,780 So pause the video right now. 218 00:11:56,780 --> 00:11:59,840 I know you don't know how to create instantiations yet, 219 00:11:59,840 --> 00:12:03,040 but this is a perfect time to test yourself, 220 00:12:03,035 --> 00:12:07,025 to go beyond your limits or what you think are your limits. 221 00:12:07,025 --> 00:12:08,795 So pause the video right now. 222 00:12:08,795 --> 00:12:11,645 Go to the Shalon. 223 00:12:11,645 --> 00:12:17,005 What we'll do is we're going to instantiate, 224 00:12:17,000 --> 00:12:18,950 will open up the brackets. 225 00:12:18,950 --> 00:12:22,180 And we can see right here all the options that we have. 226 00:12:22,175 --> 00:12:25,255 But we already know from the documentations how to use it. 227 00:12:25,250 --> 00:12:28,040 What is the original object that we'll use? 228 00:12:28,040 --> 00:12:31,670 It will be the bullet that we got the reference to. 229 00:12:31,670 --> 00:12:34,960 What is the position that we want to set this bullet add. 230 00:12:34,955 --> 00:12:39,475 It's going to be add the fire point dot position. 231 00:12:39,470 --> 00:12:42,020 And because we've added a position, 232 00:12:42,020 --> 00:12:49,030 we want to also add a rotation and it's simply going to be the fire point dot rotation. 233 00:12:49,025 --> 00:12:50,305 Save that. 234 00:12:50,300 --> 00:12:54,680 So now when we click the mouse button non-zero, 235 00:12:54,680 --> 00:12:57,650 we will instantiate the bullet, 236 00:12:57,650 --> 00:13:00,740 which we got a reference to at 237 00:13:00,740 --> 00:13:06,130 the fire point position that we've created with the far points rotation. 238 00:13:06,125 --> 00:13:09,595 Why are we specifying the fire point rotation? 239 00:13:09,590 --> 00:13:12,320 Because if I click on the far point, 240 00:13:12,320 --> 00:13:15,220 you can see how it's being rotated right here. 241 00:13:15,215 --> 00:13:23,245 If I rotate the arm right now because the fire point is a child of the weapons are, 242 00:13:23,240 --> 00:13:26,050 you'll notice now that this is the direction, 243 00:13:26,045 --> 00:13:28,195 even though the rotation is still 0. 244 00:13:28,190 --> 00:13:31,070 But the direction you can see right here, 245 00:13:31,070 --> 00:13:34,120 if you can see it changed this from global to local. 246 00:13:34,115 --> 00:13:38,005 You'll see how the fire point is directed. 247 00:13:38,000 --> 00:13:41,870 So I'm going to satisfy back to 0. 248 00:13:41,870 --> 00:13:45,220 And the rotations are sometimes weird. 249 00:13:45,215 --> 00:13:48,065 It's not about just 0. If we look at the position, 250 00:13:48,065 --> 00:13:50,425 if we change the rotation, 251 00:13:50,420 --> 00:13:52,730 you'll notice that the position also changes. 252 00:13:52,725 --> 00:13:54,255 It's a bit confusing. 253 00:13:54,250 --> 00:13:58,780 That's why we use usually quaternions rotations in Unity are very iffy. 254 00:13:58,780 --> 00:14:00,520 Anyways, we'll save that. 255 00:14:00,520 --> 00:14:06,600 We will run our game and now we can shoot our bullets. 256 00:14:06,595 --> 00:14:09,045 How cool is that? 257 00:14:09,040 --> 00:14:11,760 Look at how many bullets we have created. 258 00:14:11,755 --> 00:14:12,915 But as you can see, 259 00:14:12,910 --> 00:14:16,140 when we shoot a lot of bullets, they destroy themselves. 260 00:14:16,135 --> 00:14:18,235 So that's a no-no. 261 00:14:18,235 --> 00:14:19,855 So with that done, 262 00:14:19,855 --> 00:14:20,995 I hope you enjoy it. 263 00:14:20,995 --> 00:14:25,335 Make sure to commit the changes in the next video, 264 00:14:25,330 --> 00:14:27,340 we'll make our bullets far 265 00:14:27,340 --> 00:14:31,290 automatically without having to press the button every single time. 266 00:14:31,285 --> 00:14:32,785 Even though this is a shotgun, 267 00:14:32,785 --> 00:14:35,165 we'll make it an automatic shotgun. 268 00:14:35,160 --> 00:14:36,730 So commit the changes, 269 00:14:36,725 --> 00:14:40,235 and I'll see you in the next video.