1 00:00:03,040 --> 00:00:07,210 In this lecture, we're going to be changing things so that our player can push forward, move forward 2 00:00:07,210 --> 00:00:12,280 backwards, move backwards and rotate left and right using the left and right arrow keys. 3 00:00:12,280 --> 00:00:14,650 So let's add input into our game. 4 00:00:14,680 --> 00:00:16,960 Let's start by understanding what an input system is. 5 00:00:16,960 --> 00:00:20,530 So an input system is a way of converting the player's physical action. 6 00:00:20,530 --> 00:00:25,900 So in other words, a button press or a key press into information for the game so that it can understand 7 00:00:25,900 --> 00:00:27,370 it and know what to do with it. 8 00:00:27,370 --> 00:00:30,790 Unity is used a few different input systems over the years. 9 00:00:30,790 --> 00:00:36,550 They're constantly evolving and improving, and currently in the version of unity that I'm using, there 10 00:00:36,550 --> 00:00:41,260 is an old system and a new system, and it's actually called the old system and the new system. 11 00:00:41,260 --> 00:00:45,520 We're going to use both of these systems in this course, and I'm going to, in this current project, 12 00:00:45,520 --> 00:00:50,740 use the old system because I personally think the old system is a lot easier just to understand and 13 00:00:50,740 --> 00:00:53,470 to get started with and say, let's just make a thing happen. 14 00:00:53,470 --> 00:00:57,400 But we will use the new system later on in this course. 15 00:00:57,440 --> 00:00:59,110 We'll start that process of having a look at it. 16 00:00:59,110 --> 00:01:04,150 If you go to edit and then find project settings, you'll see a whole lot of settings in here. 17 00:01:04,150 --> 00:01:06,430 One of these is the input manager. 18 00:01:06,430 --> 00:01:08,380 You might have this closed up on your axes. 19 00:01:08,380 --> 00:01:14,980 So input manager axes and axes is the plural for the word axis, which is basically meaning from one 20 00:01:14,980 --> 00:01:17,050 side of something to another side of something. 21 00:01:17,050 --> 00:01:24,790 So that's an axis going from say 0 to 1 or minus one to plus one and all the steps along in between. 22 00:01:24,790 --> 00:01:30,040 So the axes that we've got in here, a whole bunch that are already within unity, one is horizontal 23 00:01:30,040 --> 00:01:31,570 and another is vertical. 24 00:01:31,570 --> 00:01:37,990 So horizontal is going to be a way for us to push left or right and have our vehicle go left or right. 25 00:01:37,990 --> 00:01:44,110 Or you could also use a and so if you look at left and right, the arrows on your keyboard or and is 26 00:01:44,110 --> 00:01:50,710 also correspond to if you say using the WASD controls as you do in a first person shooter, the A would 27 00:01:50,710 --> 00:01:52,420 be left and DX would be to the right. 28 00:01:52,420 --> 00:01:56,590 And there's a couple of other settings that come along with this, but mostly I'm going to leave those 29 00:01:56,590 --> 00:02:01,150 as the default, just knowing that we need to know the name horizontal and we know that that's going 30 00:02:01,150 --> 00:02:03,760 to correspond to left and right and also vertical. 31 00:02:03,760 --> 00:02:10,479 Similarly, we need to know the name vertical and that will correspond to up and down on the keyboard. 32 00:02:10,720 --> 00:02:16,900 S And W interestingly, if you scroll down, you'll see that there's also another horizontal and vertical 33 00:02:16,900 --> 00:02:18,700 roundabout here, horizontal. 34 00:02:18,700 --> 00:02:24,190 And this is going to correspond to using a joystick or a game pad where you can do similarly. 35 00:02:24,190 --> 00:02:28,030 You can move up on the joystick or down on the joystick and likewise with vertical. 36 00:02:28,030 --> 00:02:34,570 So it's already set up within unity that you can use keyboard and mouse as well as joystick or joy pad 37 00:02:34,570 --> 00:02:35,710 to be out of control. 38 00:02:35,710 --> 00:02:39,490 We're just going to worry about keyboard for the moment, just because I know that not everyone has 39 00:02:39,490 --> 00:02:41,410 a joystick that they have access to. 40 00:02:41,440 --> 00:02:46,750 Now, the one nasty thing of using the old system is that we need to get the name exact because we're 41 00:02:46,750 --> 00:02:48,970 going to use a string reference and I'll show you that in the moment. 42 00:02:48,970 --> 00:02:52,870 But just remember, if you have any issues, it might be because you don't have the name typed out. 43 00:02:52,870 --> 00:02:53,500 Exactly. 44 00:02:53,500 --> 00:02:58,210 And the last thing I'll mention in here is that our horizontal and our vertical axes are going to go 45 00:02:58,210 --> 00:03:00,940 from minus one to plus one. 46 00:03:00,940 --> 00:03:03,490 So from minus one through zero to plus one. 47 00:03:03,490 --> 00:03:08,290 So within rotate, we've currently got stair speed, which is cool, but I want to replace that or I 48 00:03:08,290 --> 00:03:14,080 want to add to that a way that we can access our input, access our horizontal input. 49 00:03:14,080 --> 00:03:17,890 So within our update method, this is going to be a little bit messy for a moment, but we'll tidy it 50 00:03:17,890 --> 00:03:18,610 up later on. 51 00:03:18,610 --> 00:03:27,100 I'm going to add myself a new variable which will be of type float and I'll call this steer amount equals. 52 00:03:27,100 --> 00:03:31,300 And you know, we'll finish this in a moment because I first want to touch on the fact that, well, 53 00:03:31,300 --> 00:03:36,430 we've got a variable down here in our update method, whereas before we put our variables outside of 54 00:03:36,430 --> 00:03:38,500 the update method, what's going on with that? 55 00:03:38,500 --> 00:03:40,450 Well, the there's a few reasons. 56 00:03:40,450 --> 00:03:46,270 The one important reason at the moment is I need to be able to calculate this steer amount every single 57 00:03:46,270 --> 00:03:49,870 frame because the player is going left and then going right and then doing nothing left and right and 58 00:03:49,870 --> 00:03:50,560 left and right. 59 00:03:50,560 --> 00:03:53,290 So I need to have that within update that we're calculating. 60 00:03:53,290 --> 00:03:54,700 What is the sticker amount? 61 00:03:54,700 --> 00:03:59,800 How much of my steering every single frame, whereas these other variables I only need to be knowing 62 00:03:59,830 --> 00:04:04,810 what they are at the start when I click on play and I'm not changing them every single frame, so I 63 00:04:04,810 --> 00:04:06,580 don't need to put them down in updates. 64 00:04:06,580 --> 00:04:10,270 So that's one of the reasons why we've put our variable down in here an update because it needs to be 65 00:04:10,270 --> 00:04:11,650 updating and changing. 66 00:04:11,650 --> 00:04:13,420 Okay, so sticker amount. 67 00:04:13,420 --> 00:04:16,390 And then here I'm going to call a method. 68 00:04:16,390 --> 00:04:17,620 Remember we're calling methods here. 69 00:04:17,620 --> 00:04:20,200 When we say transform, rotate, that's calling a method. 70 00:04:20,200 --> 00:04:22,089 I'm going to access input. 71 00:04:22,089 --> 00:04:24,550 And this is a class of things to do with input. 72 00:04:24,550 --> 00:04:28,480 So input dot, what do we have access to within the input class? 73 00:04:28,480 --> 00:04:33,460 Well, a bunch of things in here, one of which is going to be get access. 74 00:04:33,490 --> 00:04:35,800 Get access is going to get a particular access. 75 00:04:35,800 --> 00:04:41,020 Which access while we add our parentheses and here's what we put in a string reference and string references 76 00:04:41,020 --> 00:04:45,850 are a bit yucky because if you spell them wrong, it doesn't work and it often doesn't tell you why 77 00:04:45,850 --> 00:04:46,420 it didn't work. 78 00:04:46,420 --> 00:04:47,800 So we need to be careful here. 79 00:04:47,800 --> 00:04:53,950 We're steering, so we need to add horizontal and make sure you type it exactly as I have done there 80 00:04:53,950 --> 00:04:57,070 or you can jump back over into your edit project settings. 81 00:04:57,070 --> 00:05:02,470 Fine horizontal double click on that control, see for copy and then back over in. 82 00:05:02,590 --> 00:05:05,770 To your code and paste it straight up in here. 83 00:05:05,770 --> 00:05:11,080 So that's the way that you can make sure you don't mess it up and then semicolon down the end as a starting 84 00:05:11,080 --> 00:05:11,320 point. 85 00:05:11,320 --> 00:05:12,610 We're going to add to this in a moment. 86 00:05:12,610 --> 00:05:17,470 So instead of stair speed, I'm going to add in here the amount and see what happens. 87 00:05:17,470 --> 00:05:18,550 We'll update this in a moment. 88 00:05:18,550 --> 00:05:23,110 I just want to start so we've got steer amount, which is basically just, hey, what's the player pushing 89 00:05:23,110 --> 00:05:28,960 from minus one to plus one on the left and right arrows will save that jump back over into unity. 90 00:05:28,960 --> 00:05:30,130 Click on play. 91 00:05:30,130 --> 00:05:33,670 Now, we should have the first controls within our game. 92 00:05:33,940 --> 00:05:36,760 Click on play left and right. 93 00:05:36,760 --> 00:05:38,680 Well, first thing I notice is it's back to front. 94 00:05:38,680 --> 00:05:42,070 It's backwards, but it's actually working, working, working, working. 95 00:05:42,070 --> 00:05:43,300 Lovely and it's not too bad. 96 00:05:43,300 --> 00:05:46,330 So I'm going to get out of the play mode, jump back over into here. 97 00:05:46,330 --> 00:05:47,980 I want it the other way around. 98 00:05:47,980 --> 00:05:52,000 So instead of having steer amount, I'm just going to say negative steer amount. 99 00:05:52,000 --> 00:05:54,820 Actually, I'll grab my pen tool and just quickly draw that on the screen. 100 00:05:54,820 --> 00:05:55,810 So that makes sense here. 101 00:05:55,810 --> 00:05:57,730 So we're talking about steer amount. 102 00:05:57,730 --> 00:06:03,130 And if we have a value of minus one which is saying left and plus one which is to the right, zero is 103 00:06:03,130 --> 00:06:03,910 doing nothing. 104 00:06:03,910 --> 00:06:06,700 So this is left arrow and right arrow. 105 00:06:06,700 --> 00:06:09,850 If we push down the left arrow, we're going to get a value of minus one. 106 00:06:09,850 --> 00:06:12,850 But currently that's making us rotate in the wrong direction. 107 00:06:12,850 --> 00:06:19,660 So just basic maths is if we say minus, minus one, that actually equals plus one, minus minus one 108 00:06:19,660 --> 00:06:20,440 equals plus one. 109 00:06:20,440 --> 00:06:27,010 And over here, if we just say add a minus to this, then minus plus one is going to equal minus one. 110 00:06:27,010 --> 00:06:29,320 So it's one of those rules that I think many of us know. 111 00:06:29,320 --> 00:06:34,360 But if you try to subtract a negative, then what you end up doing is actually editing, adding. 112 00:06:34,360 --> 00:06:43,930 So if I try to say, for example, zero take away minus one ends up actually saying zero plus one, 113 00:06:43,930 --> 00:06:48,700 because when you take away a minus, you end up adding and if that doesn't quite click for you, then 114 00:06:48,700 --> 00:06:53,140 you can just look at it from the point of view of saying Adding a minus will say, do the other thing, 115 00:06:53,140 --> 00:06:54,070 do the opposite. 116 00:06:54,070 --> 00:06:57,910 So instead of doing a minus, we'll do a plus instead of plus or minus. 117 00:06:57,910 --> 00:07:00,130 That's another way you can look at it since it's doing this. 118 00:07:00,130 --> 00:07:04,180 So we're doing that stellar amount is now heading in the direction we want it to head in, which is 119 00:07:04,180 --> 00:07:04,750 cool. 120 00:07:04,750 --> 00:07:09,100 However, we've lost a little bit of our control in terms of how fast we turn. 121 00:07:09,100 --> 00:07:14,110 So what I'm going to do in here, my input, get access, I'm going to multiply. 122 00:07:14,110 --> 00:07:21,730 So we use this asterisks which is above eight on your keyboard, multiply by steer speed and now whatever 123 00:07:21,730 --> 00:07:25,150 we put in steers speed, which is currently one, but we might have changed it. 124 00:07:25,150 --> 00:07:31,900 Now Inspector is going to be multiplied to the horizontal value and we're going to be applying that 125 00:07:31,900 --> 00:07:38,800 as our rotation value in this z part of our rotate method. 126 00:07:38,800 --> 00:07:40,540 Now jump back over into unity. 127 00:07:40,540 --> 00:07:43,420 So click on play and make sure I'm clicked into my game window. 128 00:07:43,420 --> 00:07:48,130 When I hit left and hit right, it's going the same speed it was going before because I've just added 129 00:07:48,130 --> 00:07:50,860 one into my steer speed. 130 00:07:50,860 --> 00:07:55,270 If I pop in here say 0.5, click on save, click on play. 131 00:07:55,300 --> 00:07:59,200 Now have a look at what we're going to do in here, but stop moving left. 132 00:07:59,200 --> 00:08:00,820 Okay, we're turning more slowly. 133 00:08:00,820 --> 00:08:07,390 So I now have the ability to read in the player's input on the left and the right, and also by multiplying 134 00:08:07,390 --> 00:08:12,700 that by 0.5 or the steer speed, I can change how fast my player is turning. 135 00:08:12,700 --> 00:08:16,120 I put that up to say three and then click back in my game window. 136 00:08:16,120 --> 00:08:21,010 Look, I'm a little bit off the screen here and then you rotate in a way that's super crazy and fast. 137 00:08:21,010 --> 00:08:24,730 Now, what you might have noticed there, I didn't mention this before, but if you're in play mode 138 00:08:24,730 --> 00:08:29,920 and you make a change to any of these variables, the values to the variable, then when you click out 139 00:08:29,920 --> 00:08:33,070 of play mode, it will return back to what it was before. 140 00:08:33,070 --> 00:08:36,730 So if you make some cool changes, then you want to remember it or write it down. 141 00:08:36,730 --> 00:08:42,490 Or you can also click on right click and copy and then you can paste it back into the value that you 142 00:08:42,490 --> 00:08:43,120 had before. 143 00:08:43,120 --> 00:08:48,670 So this is what we've got for our rotate it steer amount and we're using the horizontal times by steer 144 00:08:48,670 --> 00:08:49,240 speed. 145 00:08:49,240 --> 00:08:54,280 Your speed might be a little bit different to mine, and that is because of the speed with which your 146 00:08:54,280 --> 00:08:56,920 computer runs in order to get the same result. 147 00:08:56,920 --> 00:09:01,420 We're going to cover that in the next lecture, but for now, we'll leave it as that nice basic formula 148 00:09:01,420 --> 00:09:02,050 just there. 149 00:09:02,050 --> 00:09:06,250 The other thing we need to do is to add the same sort of logic for movement. 150 00:09:06,250 --> 00:09:09,610 So we're taking in the vertical axis and that's going to be your challenge. 151 00:09:09,610 --> 00:09:15,100 So use the vertical axis to allow the player to drive forward and backwards using the arrow keys. 152 00:09:15,100 --> 00:09:16,060 Just a little bit of a hint. 153 00:09:16,060 --> 00:09:17,890 You can add it as a line just here. 154 00:09:17,890 --> 00:09:23,260 Whatever new line you're going to add, you can add it just underneath the sticker amount and there's 155 00:09:23,260 --> 00:09:23,740 your challenge. 156 00:09:23,740 --> 00:09:24,340 Pause video. 157 00:09:24,340 --> 00:09:24,880 Take that on. 158 00:09:24,880 --> 00:09:25,990 See you back here when you're done. 159 00:09:28,100 --> 00:09:32,810 So hopefully that made sense because we're going to do a very similar thing as what we just did to our 160 00:09:32,810 --> 00:09:35,240 sticker amount we're going to do for our move amount. 161 00:09:35,240 --> 00:09:44,340 So float and then we'll call it move amount equals input, get access, parentheses and then vertical. 162 00:09:44,360 --> 00:09:47,360 Make sure you spell it exactly like that or else you'll get some issues. 163 00:09:47,360 --> 00:09:49,670 And then we're going to multiply it by what? 164 00:09:49,700 --> 00:09:55,970 We'll multiply it by move speed, and then we need to, instead of using move speed, we want to use 165 00:09:55,970 --> 00:09:58,610 move amount in here. 166 00:09:58,640 --> 00:09:59,260 Cool. 167 00:09:59,270 --> 00:10:00,460 We'll save that up. 168 00:10:00,470 --> 00:10:02,280 Jump back over into unity. 169 00:10:02,300 --> 00:10:04,520 I want to make sure that I can move forwards and backwards. 170 00:10:04,520 --> 00:10:06,180 This move amount multiplier. 171 00:10:06,200 --> 00:10:08,300 That'd be interesting to see if that is enough. 172 00:10:08,300 --> 00:10:09,530 So click on play. 173 00:10:09,560 --> 00:10:12,020 It shouldn't go anywhere when I click on play. 174 00:10:12,350 --> 00:10:13,090 Okay, good. 175 00:10:13,100 --> 00:10:15,230 Now when I push forward, it goes forward, backwards, backwards. 176 00:10:15,230 --> 00:10:17,690 And can I steer and move at the same time? 177 00:10:17,690 --> 00:10:18,910 Indeed I can. 178 00:10:18,920 --> 00:10:20,060 Wonderful. 179 00:10:20,060 --> 00:10:20,450 Excellent. 180 00:10:20,450 --> 00:10:21,050 So there we go. 181 00:10:21,050 --> 00:10:24,670 We've added input so our player can drive their car. 182 00:10:24,680 --> 00:10:25,880 I'll see you in the next lecture.