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These are the user uploaded subtitles that are being translated: 1 1 00:00:00,000 --> 00:00:04,095 [MUSIC] 2 2 00:00:04,095 --> 00:00:07,460 In this video, we're going to add a collision and rigid body to our player. 3 3 00:00:07,460 --> 00:00:10,520 We are going to add some collision to our environment so 4 4 00:00:10,520 --> 00:00:11,880 that we can drop our player. 5 5 00:00:11,880 --> 00:00:16,020 And he goes, oop, clunk, and lands on our world. 6 6 00:00:16,020 --> 00:00:18,920 Okay, let's jump in and talk collisions. 7 7 00:00:18,920 --> 00:00:19,700 This is a good time for 8 8 00:00:19,700 --> 00:00:24,030 us to prefab our player, dragging it down into our assets folder down here. 9 9 00:00:24,030 --> 00:00:27,470 Time to create a prefab itself as well, I think, so 10 10 00:00:27,470 --> 00:00:31,210 that we can keep our prefabs nice and tidy as we start to create them. 11 11 00:00:31,210 --> 00:00:33,150 Put our player into there. 12 12 00:00:33,150 --> 00:00:36,310 It's good to be considering your player as a prefab as you go along, 13 13 00:00:36,310 --> 00:00:39,770 cuz when we start to have multiple levels, we need to make sure that anything we do 14 14 00:00:39,770 --> 00:00:45,130 in the player is gonna be fine and dandy as we go through those various levels. 15 15 00:00:45,130 --> 00:00:47,940 Okay, when we look at our player, the first thing we need to do is to make sure 16 16 00:00:47,940 --> 00:00:50,590 that the player has some sort of collision. 17 17 00:00:50,590 --> 00:00:54,980 And some sort of rigidbody so that we can apply forces to it, so add a component 18 18 00:00:54,980 --> 00:01:00,160 first of all add rigidbody, rigidbody, and we'll add rigidbody 2D in this whole 19 19 00:01:00,160 --> 00:01:03,750 section of the course you'll see that we're looking for the 2D option in each of 20 20 00:01:03,750 --> 00:01:08,850 these, very similar to regular 3D rigidbody but rigidbody 2D. 21 21 00:01:08,850 --> 00:01:12,340 We have under body type dynamic, kinematic, and static. 22 22 00:01:12,340 --> 00:01:14,120 I want to take just a brief moment, 23 23 00:01:14,120 --> 00:01:17,910 if you haven't already got those embedded in your mind what they mean. 24 24 00:01:17,910 --> 00:01:21,244 That we have in terms of rigidbodies, the rigidbody 25 25 00:01:21,244 --> 00:01:26,019 component brings the game object under the forces of the physics engine and 26 26 00:01:26,019 --> 00:01:29,910 because it's 2D, it's only moving on the x y axis. 27 27 00:01:29,910 --> 00:01:33,370 The body types dynamic means that gravity and 28 28 00:01:33,370 --> 00:01:36,990 physics forces will apply to this game object. 29 29 00:01:36,990 --> 00:01:40,130 If we change that to kinematic, it means it has infinite mass. 30 30 00:01:40,130 --> 00:01:44,170 If its kinematic, it has infinite mass which means that we have to push it 31 31 00:01:44,170 --> 00:01:47,900 from point to point, we can't rely on the physics of the gravity to do that, 32 32 00:01:47,900 --> 00:01:50,000 gravity just won't apply. 33 33 00:01:50,000 --> 00:01:54,600 And if we have it as static it means it has collisions but no movement. 34 34 00:01:54,600 --> 00:01:59,460 And we talked about, Ben and I talked about, what is the right sort of 35 35 00:01:59,460 --> 00:02:03,460 rigidbody to have for our player and we think that dynamic rigidbody is gonna be 36 36 00:02:03,460 --> 00:02:06,360 more interesting so we can play around with some of the physics. 37 37 00:02:06,360 --> 00:02:09,360 We can have it bounce and jump and boing and slide and 38 38 00:02:09,360 --> 00:02:13,070 all that kind of good stuff to play around with a different aspect of Unity so 39 39 00:02:13,070 --> 00:02:16,550 that's we're going to set up our character so if we have a look at our rigid body. 40 40 00:02:16,550 --> 00:02:21,378 It's already on dynamic and the second thing that we need in here in order for 41 41 00:02:21,378 --> 00:02:25,165 our character to be colliding with the world is a collider. 42 42 00:02:25,165 --> 00:02:32,304 So we will go for a, I think we use a captural collider 2D. 43 43 00:02:32,304 --> 00:02:36,120 It's a little neater having a capsule collider than having a box. 44 44 00:02:36,120 --> 00:02:37,380 Let's have a look at that. 45 45 00:02:37,380 --> 00:02:40,280 So if I click on the player and then zoom in, 46 46 00:02:40,280 --> 00:02:42,710 we can see it's just a big circle at the moment, not so good. 47 47 00:02:42,710 --> 00:02:44,450 I need to play around with that a little bit. 48 48 00:02:44,450 --> 00:02:46,520 Shrink it in a touch. 49 49 00:02:46,520 --> 00:02:48,170 Lower it down. 50 50 00:02:48,170 --> 00:02:52,010 The goal here is to have it pretty much where the player's feet are at that 51 51 00:02:52,010 --> 00:02:54,960 point so there's no discernible difference. 52 52 00:02:54,960 --> 00:02:58,540 And because our frames of animation are going to bounce around a little bit, 53 53 00:02:58,540 --> 00:03:01,660 we don't need to have it exactly, exactly precise, but pretty good. 54 54 00:03:01,660 --> 00:03:05,099 I think that's a little bit narrower. 55 55 00:03:05,099 --> 00:03:09,613 And how is it height wise, too high so shrink down a little bit, also drop it 56 56 00:03:09,613 --> 00:03:14,502 down a little bit just raising it lowering it here, I think that's pretty good. 57 57 00:03:14,502 --> 00:03:19,551 The feet might be a tiny bit under there so we will end up with, 58 58 00:03:19,551 --> 00:03:24,702 I think I need to type this in manually .6432 there we go. 59 59 00:03:24,702 --> 00:03:30,278 So I've got an Offset of -.06 on the X and -.12 on the Y, 60 60 00:03:30,278 --> 00:03:36,816 and Size of .45 on the X and .77 on the Y that's what I've got there. 61 61 00:03:36,816 --> 00:03:40,398 We could make it a little bit higher, a little bit more to the right I think, but 62 62 00:03:40,398 --> 00:03:42,700 that is decent for now, so now we have a Collider. 63 63 00:03:42,700 --> 00:03:44,580 If we click play, what happens? 64 64 00:03:44,580 --> 00:03:47,540 You can probably guess, our player is going to go, zoink. 65 65 00:03:47,540 --> 00:03:50,820 It has gravity, but there's nothing for it to actually land on. 66 66 00:03:50,820 --> 00:03:53,060 So this is where I'd like to give you a challenge. 67 67 00:03:54,170 --> 00:03:56,390 That challenge is, make your player land. 68 68 00:03:56,390 --> 00:04:00,300 Set up the capsule collider and RigidBody on the player as we've just done. 69 69 00:04:00,300 --> 00:04:04,730 Set up Collision on your environment and go for what works. 70 70 00:04:04,730 --> 00:04:07,540 When we come back in I'm going to show you a trick 71 71 00:04:07,540 --> 00:04:10,920 that will make your tile collision even more awesome. 72 72 00:04:10,920 --> 00:04:12,690 Here's a change for you to dig around and 73 73 00:04:12,690 --> 00:04:17,660 see if you can figure out how best to add collision with the set up that we've got. 74 74 00:04:17,660 --> 00:04:19,070 With the tile map set up that we've got, 75 75 00:04:19,070 --> 00:04:22,810 a little bit of investigative journalism for you here. 76 76 00:04:22,810 --> 00:04:26,528 And to have the player drop and land without falling over, so there's 77 77 00:04:26,528 --> 00:04:30,499 a challenge for you jump in and see if your ready to take on that challenge and 78 78 00:04:30,499 --> 00:04:33,228 I'll come back with my solution when you are back. 79 79 00:04:35,381 --> 00:04:39,189 Right so we've got our player set up next we need to jump over to our tile map grid, 80 80 00:04:39,189 --> 00:04:42,944 I'm going to click on full ground the background doesn't need collision it's 81 81 00:04:42,944 --> 00:04:44,904 just there for good looks of the moment but 82 82 00:04:44,904 --> 00:04:47,370 we need to have something on the fore ground. 83 83 00:04:47,370 --> 00:04:49,750 The fore ground needs to have a couple of components. 84 84 00:04:49,750 --> 00:04:52,960 First of all we need to have, jump over in the components, 85 85 00:04:52,960 --> 00:04:58,660 a tile map Collider 2D nicely set up for us, where it immediately 86 86 00:04:58,660 --> 00:05:02,900 applies to anything that is a tile that's being painted onto the tile map. 87 87 00:05:02,900 --> 00:05:04,670 And you can see it set it up as a grid. 88 88 00:05:04,670 --> 00:05:08,080 So you might have got to that point and said, yes i'm done this is amazing. 89 89 00:05:08,080 --> 00:05:12,110 One thing that you'll find is that, if I scroll in all the way here there's 90 90 00:05:12,110 --> 00:05:16,320 a miniscule, tiny, tiny, tiny, tiny, tiny, can you see that in there? 91 91 00:05:16,320 --> 00:05:17,970 Wonder hoe far it's gonna let me go. 92 92 00:05:17,970 --> 00:05:21,100 Between this collision on the right and that collision on the left, 93 93 00:05:21,100 --> 00:05:23,980 there's just a tiny fraction different. 94 94 00:05:23,980 --> 00:05:28,100 Because we cannot get them exactly exactly the same, and that means that 95 95 00:05:28,100 --> 00:05:32,690 sometimes your player could clip into that and touch that collision. 96 96 00:05:32,690 --> 00:05:37,320 It also looks a little bit messier to have all of these boxes with all this collision 97 97 00:05:37,320 --> 00:05:42,590 and all of this information on here, so we can add to this something really cool, 98 98 00:05:42,590 --> 00:05:47,870 which is a composite collider 2D. 99 99 00:05:47,870 --> 00:05:52,750 By adding that and then going to our tile map collider 2D and saying, 100 100 00:05:52,750 --> 00:05:55,200 used by composite. 101 101 00:05:55,200 --> 00:05:59,010 It will apply one macro 102 102 00:05:59,010 --> 00:06:03,360 collision around the entirety by joining together those individual collision boxes. 103 103 00:06:03,360 --> 00:06:07,240 So you can see, it's a little bit hard to see on here, but if you have a look there, 104 104 00:06:07,240 --> 00:06:10,230 you can see the green outline goes the whole way around the outside there. 105 105 00:06:10,230 --> 00:06:15,195 If I was to turn that off in terms of the use with collision, 106 106 00:06:15,195 --> 00:06:16,600 use by composite, sorry. 107 107 00:06:16,600 --> 00:06:18,420 Turn it off, turn it back on. 108 108 00:06:18,420 --> 00:06:19,960 It's basically joining them all together. 109 109 00:06:19,960 --> 00:06:23,800 When we added that, it also added a rigidbody 2D, that's a requirement. 110 110 00:06:23,800 --> 00:06:26,333 And we are going to change the rigidbody 2D to static. 111 111 00:06:26,333 --> 00:06:30,694 We don't need it to move, we don't need it to be bouncing around in the world, 112 112 00:06:30,694 --> 00:06:35,057 it is just gonna be a static rigidbody 2D, so we have the composite collider, 113 113 00:06:35,057 --> 00:06:38,228 we have our tile map collider that is used by composite and 114 114 00:06:38,228 --> 00:06:41,168 we have our rigidbody 2D all work in harmony there. 115 115 00:06:41,168 --> 00:06:43,769 The last step is to grab our player, 116 116 00:06:43,769 --> 00:06:47,933 this is actually the second last step, grab our player, 117 117 00:06:47,933 --> 00:06:53,010 throw him up in the world, drop it down and boink not too bad at all. 118 118 00:06:53,010 --> 00:06:56,690 I say it's the second last step because when we start to move around our character 119 119 00:06:56,690 --> 00:07:01,300 we'll see something pretty interesting happening as we bump into things, 120 120 00:07:01,300 --> 00:07:03,710 our character is potentially going to rotate. 121 121 00:07:03,710 --> 00:07:10,600 So when we click on the player, jump over to the rigidbody 2D, find the constraints. 122 122 00:07:10,600 --> 00:07:14,445 And freeze the rotation on the Z Axis. 123 123 00:07:14,445 --> 00:07:15,640 Z or Z axis so 124 124 00:07:15,640 --> 00:07:19,520 that our play is not accidentally rotating around as their moving. 125 125 00:07:19,520 --> 00:07:23,550 And as a last bit of finesse, if we had a tile that wasn't exactly filling out 126 126 00:07:23,550 --> 00:07:27,170 the tile space, maybe it had a little bit of a dip in it, or an edge or 127 127 00:07:27,170 --> 00:07:32,970 a slight ramp, then what we can do is to go over into our sprite sheet. 128 128 00:07:32,970 --> 00:07:34,040 Couple of things we can do in here. 129 129 00:07:34,040 --> 00:07:38,640 If we click on our sprite sheet, go to the sprite editor, we have the ability to come 130 130 00:07:38,640 --> 00:07:41,730 into the sprite editor and then edit the physics shape. 131 131 00:07:41,730 --> 00:07:45,640 And you'll see that we have these white squares around the outside, and 132 132 00:07:45,640 --> 00:07:50,400 if I move this, then the actually physics outline is going to move for that tile. 133 133 00:07:50,400 --> 00:07:53,150 So I'll just do something a little bit crazy like that. 134 134 00:07:53,150 --> 00:07:55,300 And then apply this. 135 135 00:07:55,300 --> 00:07:56,310 Jump back into my scene. 136 136 00:07:56,310 --> 00:07:58,580 So that was applied for the corner pieces. 137 137 00:07:58,580 --> 00:08:01,760 Click on, it takes sometimes a little bit of time to update this and 138 138 00:08:01,760 --> 00:08:02,770 to see what's going on. 139 139 00:08:02,770 --> 00:08:07,150 I'll turn off our composite for the moment. 140 140 00:08:07,150 --> 00:08:09,380 So we can see that nice and clearly, use by composite. 141 141 00:08:09,380 --> 00:08:09,920 There we go. So 142 142 00:08:09,920 --> 00:08:12,550 you can see that's updated this physics shape on here 143 143 00:08:12,550 --> 00:08:14,400 to something not very elegant or very pretty. 144 144 00:08:14,400 --> 00:08:18,480 But that is how we could manipulate the individual shape of 145 145 00:08:19,520 --> 00:08:21,680 our collision on individual tiles. 146 146 00:08:21,680 --> 00:08:23,393 There's another thing we can do with the tiles. 147 147 00:08:23,393 --> 00:08:26,926 If you go to your tile assets themselves, so 148 148 00:08:26,926 --> 00:08:32,080 find something that is a .asset file, that is a tile asset, and 149 149 00:08:32,080 --> 00:08:37,051 I'll find that same piece in there, which is this Rock_0. 150 150 00:08:37,051 --> 00:08:40,440 You can see under here there's Collider Type Sprite, Grid and None. 151 151 00:08:40,440 --> 00:08:42,900 If I change this to grid, then it should say, 152 152 00:08:42,900 --> 00:08:47,880 instead of doing that funky collision physics outline I just created, 153 153 00:08:47,880 --> 00:08:52,520 it should apply just straight up grid outline on that, which it has done. 154 154 00:08:52,520 --> 00:08:55,190 And then let's check that if we use Bicomposite 155 155 00:08:55,190 --> 00:08:59,550 then it stitches it all together nice and neatly as it did before. 156 156 00:08:59,550 --> 00:09:05,620 Okay, so I'll go back and just undo the mess that I created on this tile here, 157 157 00:09:05,620 --> 00:09:09,270 that was the illustrative purposes, you don't need to go and mess up your 158 158 00:09:09,270 --> 00:09:13,040 collision like that, your physics shaped like that, is drag it back up to where it 159 159 00:09:13,040 --> 00:09:18,880 was, drag up there, right that should be nice and neat, reapply that. 160 160 00:09:18,880 --> 00:09:19,580 Good to go. 161 161 00:09:21,050 --> 00:09:24,240 So we've got our physics set up, couple of different options there. 162 162 00:09:24,240 --> 00:09:27,340 Our player, let's apply that back to to the prefab, get into that habit now. 163 163 00:09:27,340 --> 00:09:28,030 Click play, 164 164 00:09:28,030 --> 00:09:31,680 see what happens when we drop the player down to the world, clunk, perfect. 165 165 00:09:31,680 --> 00:09:35,540 We've got our player ready to go and ready to moved around in our world. 166 166 00:09:35,540 --> 00:09:39,150 Great stuff in this lecture and I'll see you in the next video. 17593