WEBVTT 00:06.810 --> 00:07.890 Welcome back. 00:07.920 --> 00:16.260 Now that we have our enemies firing projectiles, it's time for some of the slightly more cosmetic aspects 00:16.260 --> 00:16.980 of this. 00:17.010 --> 00:22.050 We want our slingshot enemies to actually fire a slingshot. 00:22.080 --> 00:24.760 We want that slingshot to stretch. 00:24.780 --> 00:27.070 We want them to be holding the pouch. 00:27.090 --> 00:30.060 We don't want this to be just a static weapon. 00:30.060 --> 00:32.640 We want it to be dynamic and changing. 00:32.790 --> 00:36.720 So we're going to do that over the course of these next couple videos. 00:36.990 --> 00:42.870 Now, what I can do is start closing down some of these tabs that I don't need open. 00:44.850 --> 00:48.450 So I'm going to go ahead and just close a bunch of them down. 00:48.570 --> 00:55.650 Now let's right click on one of these goblins and just edit that goblin blueprint so we can see what 00:55.650 --> 00:56.730 it looks like here. 00:56.760 --> 00:59.220 Now here's our idle animation. 00:59.220 --> 01:06.630 And if we're idling, well, I think our goblin should be holding the pouch and we know the pouch can 01:06.630 --> 01:12.280 stretch, or at least the cord that the pouch is stuck to that can stretch. 01:12.300 --> 01:16.770 So we need to figure out exactly how we can make that happen. 01:16.770 --> 01:19.530 And our slingshot is a skeletal mesh. 01:19.530 --> 01:24.780 And for that reason, we can have an animation blueprint for our slingshot. 01:24.780 --> 01:31.320 So I'd like to do that so we can have a little bit of control over the slingshot bone position, specifically 01:31.320 --> 01:32.250 the pouch. 01:32.580 --> 01:37.860 So we're going to make an animation blueprint for our slingshot. 01:38.430 --> 01:46.270 So I'm going to go into Blueprints, Character Goblin Slingshot, and we're going to make a new animation 01:46.270 --> 01:47.320 blueprint here. 01:47.500 --> 01:52.720 I'm just going to right click, go to animation and choose animation Blueprint, and we're going to 01:52.720 --> 02:01.360 choose the skeleton for our slingshot and create this and call this a BP underscore slingshot. 02:01.780 --> 02:05.430 So now we have an animation blueprint for the Slingshot. 02:05.440 --> 02:06.960 Pretty interesting. 02:06.970 --> 02:11.940 Now we're going to have just a basic pose for our slingshot. 02:11.950 --> 02:15.610 So our anim graph is going to be quite simple. 02:15.700 --> 02:20.650 We'll have a state machine, so we're going to right click make a state machine. 02:24.030 --> 02:25.890 I'm just going to call it Maine. 02:26.460 --> 02:30.480 And in Maine, we're going to have a single state. 02:30.480 --> 02:33.600 And our slingshot has an idle animation. 02:33.600 --> 02:35.160 And really, it's nothing. 02:35.160 --> 02:36.030 It doesn't do anything. 02:36.030 --> 02:37.920 It's a single frame like this. 02:37.920 --> 02:40.920 It's just a default animation. 02:40.920 --> 02:42.570 That's what our state will be. 02:42.570 --> 02:49.020 We'll have slingshot idle, the entry will go into that, and then our main will go into the output 02:49.020 --> 02:49.830 pose. 02:49.830 --> 02:52.140 But we do have an attack. 02:52.140 --> 02:54.090 Animation looks like this. 02:54.120 --> 02:56.850 We're going to be making an attack montage. 02:56.850 --> 03:01.980 So we do want to run this through a slot and we're just going to use the default slot. 03:02.010 --> 03:04.560 So there's our animation blueprint. 03:04.590 --> 03:06.900 So this is pretty simple, pretty basic. 03:06.900 --> 03:08.760 We're not doing anything too crazy, right? 03:08.760 --> 03:11.520 So why do we need an animation blueprint? 03:11.550 --> 03:17.430 Well, the reason is we can control bone positions with our animation blueprint. 03:17.430 --> 03:26.290 And I'd like my bone position to follow the bone position of the goblin that's holding the slingshot. 03:26.290 --> 03:29.410 So the question is, how are we going to do that? 03:29.440 --> 03:36.430 Well, for one, we need to know the transform location rotation of our owner's hand. 03:36.520 --> 03:43.210 We should have at least a socket on the owning goblin that is on its right hand. 03:43.210 --> 03:43.510 Right? 03:43.510 --> 03:50.440 So let's go to our goblins, mesh the skeletal mesh and open that up and let's just see what we have. 03:50.440 --> 03:53.380 We have a socket on the left hand. 03:53.380 --> 03:55.390 It's called weapon hand socket. 03:55.420 --> 04:00.670 We don't have anything on the right hand, but we should because that right hand is going to hold the 04:00.670 --> 04:01.570 pouch. 04:01.570 --> 04:06.040 So I'm going to select that hand hand. 04:06.040 --> 04:11.440 And look, we have actually a socket right there called hand our socket. 04:11.440 --> 04:12.520 That's fine. 04:12.520 --> 04:14.260 If we want, we can rename that. 04:14.260 --> 04:16.450 Let's go ahead and rename it to something better. 04:16.450 --> 04:19.960 I'm going to call it right hand socket. 04:20.260 --> 04:24.070 So our right hand has the right hand socket on it. 04:24.070 --> 04:28.750 Right there and we can position it if we want to change that position. 04:28.750 --> 04:32.830 But I think it looks good and we want to know the location of that. 04:32.980 --> 04:39.460 So here in the animation blueprint for the Slingshot, we need to access the owning pawn and get its 04:39.460 --> 04:40.270 skeletal mesh. 04:40.270 --> 04:45.010 And from that mesh we need to get that socket location for the right hand socket. 04:45.130 --> 04:48.370 So we'll do all this here in the event graph. 04:48.400 --> 04:54.640 What we're going to do is we're going to get the pawn owner, try to get it, and we need to at least 04:54.640 --> 04:59.380 cast it to a character so we can get its skeletal mesh component. 04:59.380 --> 05:01.720 So what I'm going to do is cast a character. 05:02.450 --> 05:04.520 After casting two character. 05:04.550 --> 05:10.280 I'm going to get the characters mesh using get mesh. 05:11.730 --> 05:13.460 From the characters Mash. 05:13.470 --> 05:19.140 I'm going to try to access one of the sockets by calling Get Socket Transform. 05:19.530 --> 05:22.640 Transform will return us a transform. 05:22.650 --> 05:29.130 Now the socket will be retrieved by name and we know that the right hand socket is called right hand 05:29.160 --> 05:29.850 socket. 05:29.850 --> 05:35.670 So we're going to select right hand socket here and we can choose transform space. 05:35.670 --> 05:41.340 I'd like to use world space Now this is in Blueprint update animation. 05:41.340 --> 05:46.830 So we're kind of casting every frame, so it'd be nice to store this just once at the beginning so we 05:46.830 --> 05:52.530 don't have to cast every frame and then every frame we could be setting some variable. 05:52.530 --> 05:59.400 We can promote this transform to a variable and call this hand socket transform. 06:00.490 --> 06:02.590 And it looks like I put a comma there. 06:03.070 --> 06:04.330 No commas. 06:04.720 --> 06:07.570 Okay, so we don't want to cast every frame. 06:07.570 --> 06:15.760 We can initialize this at the beginning by overwriting this at the beginning, by implementing event 06:15.760 --> 06:18.820 blueprint, initialize animation. 06:18.820 --> 06:22.000 So I'd like to move this cast up there. 06:28.240 --> 06:36.100 And what we can do is we can simply store a variable that we can get the socket transform from every 06:36.100 --> 06:36.820 frame. 06:36.820 --> 06:43.540 So it might be handy to just take the character call, get mesh on it, and from that mesh, promote 06:43.540 --> 06:47.830 that to a variable called owner mesh. 06:49.800 --> 06:56.040 Like so and then we can just get that socket transform from owner mesh every frame. 06:56.920 --> 06:58.390 So right there. 06:59.120 --> 07:05.060 Getting the owner mesh and updating socket transform or hand socket transform. 07:05.060 --> 07:10.420 So every frame we're getting this socket transform, we want to use that socket transform somehow. 07:10.430 --> 07:12.320 So how are we going to use that? 07:12.620 --> 07:20.240 Well, we can go to our anim graph and before running our state through the default slot and the output 07:20.240 --> 07:24.130 pose, we can modify one of its bones. 07:24.140 --> 07:27.770 We can use a transform modify bone node. 07:27.770 --> 07:36.380 So if we right click and type transform, modify bone, then this node allows us to transform a bone 07:36.380 --> 07:40.520 based on some translation, rotation and scale. 07:40.520 --> 07:47.960 And if we get our hand socket transform and we break that transform or we split the struct pin, we 07:47.960 --> 07:50.060 can then plug these values in. 07:50.090 --> 07:56.090 The transform location can be plugged into translation, rotation to rotation and scale. 07:56.090 --> 07:57.080 We can leave that at one. 07:57.080 --> 08:02.370 We don't need to change the scale for anything, but we'd like to transform our pouch bone. 08:02.370 --> 08:08.580 So if I select transform, modify Bone in the Details panel, we can configure this node and the bone 08:08.580 --> 08:09.450 to modify. 08:09.450 --> 08:17.460 I would like to be my pouch bone and I'd like to modify its translation and rotation so we can expose 08:17.460 --> 08:18.750 more of this details. 08:18.750 --> 08:24.870 Panel And for translation I want to replace the existing translation. 08:24.870 --> 08:31.590 So translation mode I can choose replace existing and I want my translation space to be world space. 08:31.620 --> 08:32.070 Why? 08:32.100 --> 08:37.080 Because in my event graph we're getting the socket transform in world space. 08:37.080 --> 08:41.400 So just to make everything consistent, it's going to be world space here. 08:41.400 --> 08:48.090 And for the rotation, I'd like to also replace existing and I'd like this to be in world space as well 08:48.090 --> 08:50.550 and the scale I want to ignore. 08:50.550 --> 08:57.570 So I don't even need my scale exposed as a pin so I can click right here and uncheck expose pin. 08:57.570 --> 09:01.080 And now we don't even care about the scale. 09:01.080 --> 09:04.920 It's not exposed as a pin, so it doesn't matter now. 09:04.920 --> 09:09.360 The alpha is going to be one, so we don't need to expose the alpha either. 09:09.360 --> 09:12.210 We can un expose that as well. 09:12.210 --> 09:20.550 And now our transform modify bone node is a lot simpler and we can use this by running the main state 09:20.550 --> 09:21.930 machine pose through it. 09:21.960 --> 09:28.470 Now this is going to convert from local to component space and then once we go back to the slot, it'll 09:28.470 --> 09:30.780 convert back from component to local. 09:30.780 --> 09:34.080 That's how transform Modify bone has to work. 09:34.080 --> 09:43.380 So now that we have this, we can straighten out our nodes and we have something that will set our bone, 09:43.410 --> 09:45.990 our pouch bone, every frame. 09:45.990 --> 09:54.600 Now if I compile it, that's going to set the pouch to essentially a location in rotation that doesn't 09:54.600 --> 10:01.620 really look like it makes sense, but that's okay, because if we go back to our goblin slingshot and 10:01.620 --> 10:09.420 we select the weapon and we go up into animation mode for the weapon and select an anim class and choose 10:09.450 --> 10:11.010 app Slingshot. 10:11.040 --> 10:12.390 Now look what happens. 10:12.390 --> 10:19.230 The pouch is now following that right hand socket because we're transform modifying the bone. 10:19.260 --> 10:26.880 This is great, but it doesn't really help us In the case where the enemy is playing an attack animation 10:26.880 --> 10:27.540 does it? 10:27.540 --> 10:34.680 If I take my mesh and instead of using an anim class, I switch this to use an animation asset and choose 10:34.680 --> 10:36.780 the attack Goblin slingshot. 10:36.810 --> 10:43.740 We'll see that while yes, the pouch is following the hand and while that may look okay, we want that 10:43.740 --> 10:47.670 pouch to shoot forward when we're attacking, right? 10:47.670 --> 10:50.460 So I'm going to put this back to use animation blueprint. 10:50.460 --> 10:58.290 So this is step one is getting that animation blueprint and controlling that pouch location. 10:58.290 --> 11:03.120 That looks pretty good until we see the enemies attack. 11:03.120 --> 11:12.210 So I'm going to hit pause here and eject and just zoom on in to see that our slingshot enemies do look 11:12.210 --> 11:12.720 pretty cool. 11:12.720 --> 11:17.520 Now with that pouch being held and stretched, it all looks great. 11:17.550 --> 11:19.770 We see that in the idle pose. 11:19.770 --> 11:20.550 It looks great. 11:20.550 --> 11:24.390 But we're going to want to play an attack montage for this. 11:24.420 --> 11:32.250 We're going to want our transform modify bone to not transform modify while we're attacking. 11:32.250 --> 11:37.440 So we have a few details to take care of and we'll be taking care of those next. 11:37.440 --> 11:39.840 So great job and I'll see you soon.