WEBVTT 00:00.990 --> 00:06.930 So now we have our main keys, we can actually take a look at breaking this down even further and it's 00:06.960 --> 00:12.330 really easy to get overwhelmed with animation and think, oh, my gosh, I have you know, we only did 00:12.630 --> 00:16.440 four key frames, basically, because, again, that last one is mirrored. 00:16.650 --> 00:20.920 It's the same key frame as the first frame as frame 40 is. 00:21.390 --> 00:24.270 So it really did, you know, four poses here. 00:24.600 --> 00:28.920 And when we look at this animation, we have 40 frames when we think, oh, my gosh, I have to do this 00:29.850 --> 00:30.690 10 times. 00:30.690 --> 00:34.470 What I already did, you know, don't get overwhelmed. 00:34.530 --> 00:35.880 Let's let's break this down. 00:35.880 --> 00:37.610 Let's drag the timeline. 00:37.950 --> 00:39.090 This is what I like to do. 00:39.540 --> 00:39.970 You know what? 00:39.990 --> 00:42.920 Just focus on between two key frames, OK? 00:43.260 --> 00:47.970 Once we have the keys and now we can just take it and piecemeal it down, OK? 00:48.000 --> 00:49.320 We just have this motion to worry about. 00:49.320 --> 00:50.670 Now, don't worry about anything else. 00:51.060 --> 00:52.400 We're going to get this looking right. 00:52.440 --> 00:58.170 OK, so when we look at this, we can think, OK, this is the extreme pose, right? 00:58.200 --> 01:00.360 That's the technical term, the extreme pose. 01:00.360 --> 01:03.950 These are the furthest that these two legs are going to be apart from each other. 01:03.990 --> 01:05.730 Those are the extreme distances. 01:06.330 --> 01:08.610 And we think about extreme distances. 01:08.610 --> 01:11.460 We also have to think, all right, how is this weight being carried? 01:12.180 --> 01:17.820 Is if if it's tripod and the weight is very far out there and there's a lot of weight here in the center 01:17.820 --> 01:19.830 of gravity, it's going to want to fall down. 01:20.700 --> 01:29.790 And while you're walking for these next few frames before this foot picks up the weight, your body 01:29.790 --> 01:36.900 will be going down because basically walking is controlled, falling and you're the foot in front is 01:36.900 --> 01:39.700 basically catching you each time that you fall. 01:40.230 --> 01:46.950 So if that's the case, then we can know that this center of gravity, which actually made a key frame 01:46.950 --> 01:53.580 here, I'm going to delete in my little example there that this qif this center of gravity is not going 01:53.580 --> 01:55.140 to be going up immediately. 01:55.140 --> 01:55.530 Right. 01:55.830 --> 02:00.210 Because this foot hasn't had time to really catch the weight of everything yet. 02:00.690 --> 02:02.040 So what's going to actually happen? 02:02.040 --> 02:03.720 Is this what's going to be going down? 02:03.960 --> 02:10.200 OK, so we can maybe come out here three frames and keep this down on its space bar, have the same 02:10.200 --> 02:12.630 set up I had from the previous lesson. 02:13.020 --> 02:15.120 So I have the graph header down here, another panel. 02:15.510 --> 02:19.470 I'm just I just want to go a little bit past where we started here. 02:20.170 --> 02:20.580 Right. 02:21.240 --> 02:26.190 And the other thing we need to do is get this foot flat because your foot doesn't just hang out on the 02:26.190 --> 02:26.880 heel here. 02:27.330 --> 02:32.040 So when we're going, you know, you're just sliding along the heel, that's not realistic. 02:32.400 --> 02:34.590 We need to get this foot roll down to zero. 02:34.830 --> 02:35.880 So let's get that to zero. 02:36.150 --> 02:42.990 And then you can see that the leg is very straight and that can help us guide us to kind of know biomechanically 02:43.410 --> 02:49.800 how far down with this Kohji need to go to keep that knee from popping and getting too straight, because 02:49.800 --> 02:55.110 if we were up here with this center of gravity then the leg would be far too straight and it would be 02:55.110 --> 02:56.100 a pop right. 02:56.400 --> 03:03.270 When the foot goes flat the knee would be very hyperextended to the point they would pop right here. 03:03.630 --> 03:08.780 So we can use the fact that we know the foot needs to be on the ground to drag them. 03:08.790 --> 03:15.780 Just shift middle mouse, dragging this keyframe down to a point where the knee is no longer, you know, 03:15.780 --> 03:19.110 stretch beyond where it would be hyperextended. 03:19.620 --> 03:30.600 OK, so now when we play this back, the nation pop and it's playing back a little fast, but we can 03:30.810 --> 03:31.650 scrub this. 03:31.890 --> 03:38.040 We can see it's kind of getting hyperextended here and we can fix that by let's go into the center of 03:38.040 --> 03:38.520 gravity. 03:39.360 --> 03:47.040 And instead of this having an auto tangent where it will slowly go down, we probably need to make this 03:47.040 --> 03:53.760 to be straight, go straight down so we can grab these tangents and middle mouse drag them so they're 03:53.760 --> 03:54.360 going straight. 03:54.360 --> 03:58.140 And an easier way to see this would be to go to view infinity. 03:59.370 --> 04:04.680 And now I can see that, you know, this curve is flat lining here. 04:05.100 --> 04:08.010 So we can actually say curves post infinity cycle. 04:09.390 --> 04:16.920 So we can see how these now two key frames relate to each other in a cycle, which is how we'll be using 04:16.920 --> 04:17.040 this. 04:17.040 --> 04:24.180 So it's good to go ahead and see that now so we can see that that kind of tangent continues nicely down 04:24.180 --> 04:24.990 to the bottom here. 04:25.500 --> 04:28.710 So that should help us a little bit to keep the knee from popping. 04:28.710 --> 04:33.510 It looks like it's still popping a little bit and that could maybe be from the foot. 04:34.230 --> 04:37.210 Let's look at the foot and the translate Z. 04:38.790 --> 04:45.090 Now, any time that we are animating and we're moving at a consistent rate with our feet. 04:45.090 --> 04:45.480 Right. 04:46.150 --> 04:52.110 You have to think about this is a special way to animate that. 04:52.110 --> 04:57.540 We're animating on the spot, meaning he's staying on the same he or she is staying in the same spot. 04:58.290 --> 04:59.940 And in reality, they're going to be moving. 04:59.980 --> 05:04.480 Across a distance, and if they are moving across a distance and this foot is going to stay in its place, 05:04.960 --> 05:06.940 then these need to be linear. 05:06.940 --> 05:10.720 They don't need to be, you know, nice, smooth tangents. 05:10.980 --> 05:17.320 So I'm going to go ahead and delete that and I'm going to select all of these and go to a linear motion 05:17.320 --> 05:20.880 here, because as soon as this hits the ground, it should be moving. 05:21.850 --> 05:28.600 And in reality, we might want to move this foot roll zero back a couple frames. 05:29.270 --> 05:36.310 So now it's coming down much sooner and it's working a lot nicer. 05:38.310 --> 05:44.880 So as this vote comes down, we can see now that it's catching the weight of the center of gravity. 05:45.800 --> 05:51.950 And only after that, this is flat and it's catching the weight can the center of gravity go up because 05:51.950 --> 05:54.850 it needs the center of gravity to be pushed up by something. 05:54.860 --> 05:56.690 It just can't float around willy nilly. 05:56.990 --> 06:00.260 We need to understand the motivation and the biomechanics of a walk. 06:00.650 --> 06:03.320 What is actually keeping this center of gravity from falling over? 06:03.500 --> 06:05.270 Well, it's these feet, all right. 06:05.540 --> 06:10.580 And so these keep it upright so we can see that only after that. 06:10.580 --> 06:15.020 This takes the weight of the center gravity can this go back up. 06:15.610 --> 06:19.190 OK, so we wait for that to happen and then this goes back up. 06:19.790 --> 06:20.180 Right. 06:20.540 --> 06:21.470 And that makes sense. 06:22.250 --> 06:24.800 So now we get into this pose cool. 06:25.190 --> 06:33.290 And we can go ahead and make these be linear on trancelike Z on the other foot as well, because we 06:33.290 --> 06:34.520 know that's how we're going to be working. 06:39.630 --> 06:46.410 So let's bring this back up to 40 and just take a look at this one breakdown real quick and see how 06:46.410 --> 06:48.210 much that a little bit of animation added. 06:48.630 --> 06:53.750 We can see the difference between this this foot and this other one. 06:53.760 --> 06:59.070 You can see how this other one kind of floats and the foot roll doesn't cut to the ground. 06:59.070 --> 07:01.250 But the other one, the foot gets to the ground pretty well. 07:05.890 --> 07:06.240 Cool. 07:06.700 --> 07:14.770 So it looks like we could probably, you know, adjust the WI translate now that we have the feet in 07:16.270 --> 07:17.410 linear space. 07:17.560 --> 07:21.710 Remember, when we grab these and now the translate is linear. 07:22.210 --> 07:26.820 Now it's also affecting the distance of the you know, why translate. 07:26.830 --> 07:28.630 So we could even take this. 07:29.860 --> 07:36.880 Let's grab the two top ones and let's experiment a little bit and drag these up. 07:37.630 --> 07:38.740 Looks like it won't be enough. 07:38.740 --> 07:46.390 So maybe we can even bring this up or we can mess with a tangent a little bit. 07:47.730 --> 07:48.330 So. 07:49.730 --> 07:54.620 Let's see if that helps keep this leg straight, because we don't we don't walk bent kneed. 07:55.130 --> 08:00.950 So as you do this, you might find what you have been animating. 08:03.070 --> 08:04.690 Isn't exactly what you need. 08:10.320 --> 08:16.020 Cool, so the other thing to think about is that there's going to be a little motion forward and back 08:16.380 --> 08:23.460 as as you move right, you're going to gain speed and lose speed as you're getting pushed off by your 08:23.460 --> 08:23.690 foot. 08:23.700 --> 08:29.550 So every push off of the foot is going to push your center of gravity forward a little bit so we can 08:29.550 --> 08:35.400 actually push the center of gravity forward and then it can fall backwards as it gets to this in between. 08:36.950 --> 08:40.940 So it's another little thing to think about how this motion actually works. 08:49.950 --> 08:55.920 So let's do that to this one as well, when this hits the ground, we know that the foot roll, you 08:55.920 --> 08:58.680 know, maybe two frames ahead, I believe is what we did on the other one. 08:59.010 --> 08:59.900 That's going to be zero. 09:00.570 --> 09:07.800 This is going to be forward a little bit and we're actually going to do that. 09:08.150 --> 09:12.960 A couple of frames later went take the center of gravity ones and move forward two more frames. 09:14.650 --> 09:15.750 Now, let's play that back. 09:19.760 --> 09:24.100 Might be a little much you can kind of see it kind of bouncing back and forth, so we go to translate 09:24.110 --> 09:25.810 Z and then we can just drag these down. 09:25.840 --> 09:31.800 We can also see where you know this in between we hadn't set for translate Z. 09:31.960 --> 09:36.790 So whereas over here we have this, you know, be at zero. 09:36.970 --> 09:39.490 And that wasn't the case earlier. 09:39.500 --> 09:41.500 So it's going to bounce a little more here. 09:41.870 --> 09:44.290 So let's just drag these values down a little bit. 09:44.320 --> 09:45.640 We don't wanna get too crazy with it. 09:45.640 --> 09:50.590 But just in general, you know, we won't understand the idea of, like, why the center of gravity 09:50.590 --> 09:54.760 is moving the way it is just going to move just very subtly forward. 09:54.880 --> 10:01.030 So the next lesson, let's take a look at these little knee pops and finishing out, you know, these 10:01.030 --> 10:02.530 other passing positions, right. 10:02.530 --> 10:03.130 Right here. 10:03.340 --> 10:05.520 The knee is starting to bend way too soon. 10:05.950 --> 10:11.830 So let's continue to clean this up in the next lesson and then we'll move on to adding the upper body. 10:11.860 --> 10:12.520 Thanks for watching.