WEBVTT 00:00.150 --> 00:05.340 In this lesson, we're going to quickly look at rotation order, and it's different from joint orientation 00:05.340 --> 00:12.480 because it basically says which axes it's going to rotate first, which axes is the parent axes. 00:12.510 --> 00:12.820 Right. 00:13.230 --> 00:19.980 OK, so if we take a look at this root joint, kind of the the hips joint or what's commonly referred 00:19.980 --> 00:23.260 to as the center of gravity or the kog for short. 00:23.880 --> 00:28.920 So if we take a look at this and let's say we rotate it, we can see they were rotating it. 00:28.960 --> 00:32.930 Let me just hide the polygons here so we can see only the joints. 00:33.540 --> 00:41.580 And if I hold down E and I click and I go to Gimble, I can kind of see what the rotation order is just 00:41.580 --> 00:43.280 by looking at the Gimel rotation. 00:43.330 --> 00:49.670 OK, and if we rotate axis, we can see that none of the other axes are rotating with it. 00:50.280 --> 00:58.340 And if we rotate one like why, we can quickly see that the X axis actually is moving now. 00:58.680 --> 01:03.520 So it's a child of that and same thing for the Z. 01:03.570 --> 01:05.900 We can see that it's not moving anything. 01:06.300 --> 01:14.100 So this is important because we want to know which axis is going to get in gimbal lock or which isn't, 01:14.100 --> 01:19.620 because I think I spoke about this very briefly in one of the earliest videos of this course and the 01:19.830 --> 01:23.970 modeling course and the intro to that about getting into Gimbels. 01:24.150 --> 01:28.970 So basically think about like, how does Miah supposed to know which is which? 01:29.060 --> 01:29.340 Right. 01:29.340 --> 01:30.840 Especially when things are animated. 01:30.940 --> 01:37.620 So if we rotate y let's say this person's doing a somersault and they do like a little break, break, 01:37.620 --> 01:40.020 dance move, OK, and they get to hear. 01:40.980 --> 01:41.430 All right. 01:41.640 --> 01:43.530 And now we want them to spin around their arm. 01:44.100 --> 01:45.300 Well how do we do that now? 01:45.300 --> 01:46.800 We've just lost our axis there. 01:46.800 --> 01:47.910 There's no way to do that. 01:48.390 --> 01:53.430 And what that will result in when this is animated is something called gimbal lock. 01:53.910 --> 01:59.700 So Maya will try to interpolate between keyframes and say it's some of this one at some of that one 01:59.700 --> 02:01.980 and some of this one and some of that one is some of this one and some of that one. 02:02.340 --> 02:11.040 And it will basically try to resolve this Gimbel's issue through animating these axes and kind of a 02:11.040 --> 02:16.620 wonky way so that when we go from point A to point B with these two rotation keyframes, it's going 02:16.620 --> 02:18.060 to spin around all crazy. 02:18.900 --> 02:24.270 So we want to make sure that whatever our character is going to be doing is that the rotational order 02:24.270 --> 02:28.770 follows suit, meaning most likely this character is going to spin around. 02:28.830 --> 02:29.190 Right. 02:29.940 --> 02:38.400 And that's going to be one that we want to make sure that the rotation is following along, because 02:38.610 --> 02:41.380 let's say the character rotates around and now we want him to bend over. 02:41.540 --> 02:44.670 Well, now now bending over is why. 02:45.120 --> 02:49.160 But it originally was it should stay Z, right? 02:49.440 --> 02:55.500 We want these axes to follow the main rotation that this character is going to do for that joint so 02:55.500 --> 02:59.760 you can have a different rotation order for each joint up here. 02:59.760 --> 03:05.400 If we look, you know, this one is working like everything is following the main rotation that this 03:05.400 --> 03:05.880 joint will do. 03:05.880 --> 03:08.800 This joint will only ever do this right. 03:08.850 --> 03:09.510 It's an elbow. 03:09.540 --> 03:13.740 So it makes sense that the rotation order is such that everything should follow that main rotation. 03:13.780 --> 03:19.800 OK, so let's fix this for the for this hip joint, because it's not doing that when we rotate. 03:19.800 --> 03:22.170 None of these rotations are following it. 03:22.800 --> 03:27.900 So how we do that is go into the attribute, Ed, and for some reason it fell off over here. 03:27.900 --> 03:31.140 So I'm just going to put that back where I would expect it. 03:34.860 --> 03:45.090 OK, so we have the Ashry ed open and we can go down to the rotate order here so we can see currently 03:45.090 --> 03:46.300 it's X, Y, Z. 03:46.770 --> 03:51.120 OK, and what we want is for everything to follow. 03:53.290 --> 03:56.590 The let me just click another, actually, so we can see that this one is red. 03:57.700 --> 03:59.010 Follow the axe. 03:59.410 --> 03:59.990 OK. 04:00.010 --> 04:04.930 And in this rotation order, you have to think about this backwards, which is the fun of rigging, 04:05.080 --> 04:11.020 is becoming accustomed to kind of things not being the way you would expect them to be for for myself, 04:11.020 --> 04:14.530 at least I would expect, you know, the parent to be at the top because that's how hierarchy's over 04:14.530 --> 04:16.090 here are organized. 04:16.360 --> 04:17.480 The parent is at the top. 04:17.500 --> 04:21.320 So you think, you know, the parent of this rotation should be first? 04:21.670 --> 04:23.290 Well, it's backwards so far. 04:23.290 --> 04:23.860 Rotate order. 04:23.860 --> 04:29.600 So the LA the last letter here is going to be the parent of everything. 04:30.100 --> 04:35.050 So what we want is we want the X to be the last one so we can pick one of these two. 04:36.490 --> 04:43.240 So now if we rotate this, we can see that everything is following along the X axis and we can see what 04:43.240 --> 04:46.510 the secondary one is by rotating it this way. 04:46.870 --> 04:48.600 And then which one is going to get us into Gimbels. 04:49.180 --> 04:51.970 So it depends on what you think this character is going to be doing. 04:51.970 --> 04:55.150 Is it going to be doing front flips or is it going to be doing somersaults? 04:55.150 --> 04:56.290 And he's going to go to the side. 04:56.850 --> 05:00.460 It's kind of up to you, but the main one, we want definitely one to make sure everything is following 05:00.460 --> 05:05.440 that one because we don't want to get in Grimlock when he spins around and looks over here and then 05:05.440 --> 05:12.010 he looks back and Maya has had to do this weird gimbal lock thing to interpolate between those two rotations 05:12.010 --> 05:15.250 because it wasn't the parent rotation that was being manipulated. 05:15.700 --> 05:18.340 So let's make sure that we have that. 05:18.790 --> 05:22.680 The X axis is one of the last letters here, so I'll just choose the bottom one. 05:23.050 --> 05:27.700 So we have Zwi X, and the way to think about that is let me just make three groups. 05:27.700 --> 05:29.680 One, two, three and. 05:30.970 --> 05:35.860 The way to think about this rotation order is we can even do it with the one we have over here, X, 05:35.860 --> 05:39.400 Y, Z, so that would mean Z. 05:41.060 --> 05:41.750 Why? 05:43.630 --> 05:51.040 An X, OK, that's how this rotation order is thought about in rotation. 05:51.110 --> 05:59.140 OK, so just keep that in mind when you're going through this rig and we need to look at what these 05:59.140 --> 06:01.840 joints are doing mostly. 06:01.870 --> 06:02.220 Right. 06:02.560 --> 06:06.940 And with a quick rig, it should have already done this for us for the most part. 06:07.630 --> 06:10.810 And it does appear that that that is the case. 06:10.960 --> 06:16.330 And it probably did that one on this first hip joint because it assumed, you know, it's a it was a 06:16.450 --> 06:17.290 spine joint. 06:17.500 --> 06:20.920 And so the spine is most likely going to bend forward and back. 06:21.250 --> 06:25.210 But we're going to use this like a center of gravity control. 06:25.510 --> 06:32.830 So we want to make sure that it can rotate around and not and have that be the parent rotation and not 06:32.980 --> 06:33.670 have this one. 06:34.270 --> 06:38.230 So we've gone through this and we've set the rotation order what we want it to be. 06:38.530 --> 06:41.900 We've learned about how rotation orders are important and what we need to look out for. 06:42.340 --> 06:46.990 So in the next lesson, we're going to continue to rig this thing with the knowledge that we now have. 06:47.020 --> 06:47.710 Thanks for watching.