WEBVTT 00:00.750 --> 00:05.490 In this lesson, we're going to go over the exercise that the previous video was about and if you haven't 00:05.490 --> 00:11.520 completed it yet, definitely consider finishing that before you watch this or if you're having trouble 00:11.520 --> 00:15.660 with it, go ahead and watch this one and hopefully it'll help you out as well. 00:15.900 --> 00:21.450 But I think a lot of the animation in general is, you know, you don't really internalize these concepts 00:21.450 --> 00:22.790 until you try them yourselves. 00:23.160 --> 00:24.530 So give it a try. 00:24.540 --> 00:30.480 You're not going to get a perfect I this exercise with you and I, you know, enjoyed it. 00:31.110 --> 00:36.720 It's always nice to refresh these concepts, even as someone who's been animating professionally for 00:36.720 --> 00:44.280 eight years on big, you know, feature films, this kind of stuff still is helpful for for me. 00:44.700 --> 00:47.340 So definitely take a moment and give it a try. 00:47.350 --> 00:48.600 So let's take a look at what I did. 00:48.810 --> 00:55.530 And you can open up the scene, file the ball, exercise, end and open up this exact scene file to 00:55.530 --> 00:56.510 see what I made. 00:56.940 --> 00:58.350 So lets it play. 00:58.350 --> 01:04.320 And we can already tell, you know, right away that each ball has a different type of weight. 01:04.620 --> 01:08.670 And let's discuss what is actually contributing to that difference. 01:09.420 --> 01:15.380 So if we take a look at the beach ball, it you know, it takes longer to fall. 01:15.660 --> 01:18.030 So, you know, we don't live in a vacuum. 01:18.030 --> 01:22.170 If if we lived in a vacuum, then these would both fall at the same rate. 01:22.530 --> 01:29.460 But because this ball is bigger and it has more drag with through the air, it's going to take longer 01:29.460 --> 01:30.570 for it to get to the ground. 01:30.990 --> 01:33.750 But this ball is smaller and it's heavier. 01:33.750 --> 01:36.210 So it's going to fall just a few frames quicker. 01:36.210 --> 01:43.110 We can see if we step through that, there's maybe three frames or so one, two, three, maybe four 01:43.110 --> 01:47.160 frames difference between when they come off and when they contact. 01:47.520 --> 01:49.110 That might be exaggerated a little bit. 01:49.110 --> 01:54.780 Of course, what I did isn't perfect either, but you kind of get the idea and the concepts behind this. 01:55.110 --> 02:01.620 Also, we can see that there's way more bounces on the beach ball, whereas the bowling ball just bounces 02:02.460 --> 02:08.760 twice, basically very shallow, very short bounces because it's so heavy, it's not going to bounce 02:08.760 --> 02:09.150 a lot. 02:09.780 --> 02:13.950 And then the other thing we can look at is the bowling ball continues to roll. 02:14.220 --> 02:15.480 It's a heavier object. 02:15.480 --> 02:19.560 So it takes a lot more friction with the floor to get it to stop. 02:19.860 --> 02:21.990 Whereas with the beach ball, it's very light. 02:21.990 --> 02:28.230 And so any little amount of friction with the floor is going to kind of slow it down a little bit. 02:28.590 --> 02:32.910 So let's take a look at the scene file and dig a little deeper here, because it also kind of left you 02:32.910 --> 02:35.070 to the wolves with the rotation stuff. 02:35.070 --> 02:36.420 So we'll discuss all that. 02:36.870 --> 02:44.430 So let's go into the scene file and basically how I approach this was I didn't think about the rotations 02:44.430 --> 02:45.390 at all, OK? 02:45.660 --> 02:51.120 I had all of these setups so that their rotation axes were all straight. 02:51.120 --> 02:52.890 So that would be easy to rotate. 02:52.890 --> 02:53.250 Right. 02:53.460 --> 02:58.860 If we take a look at the attributes over here and we rotate, it's only changing one value. 02:59.160 --> 03:06.030 So what I did was I animated the translation just like we did in the first generic ball that I walked 03:06.030 --> 03:08.160 you through all that stuff I did all of that same thing. 03:08.490 --> 03:14.790 And then when I was done with all the bounces and all of this stuff, I went back in and I set two key 03:14.790 --> 03:17.850 frames and I animated the rotation. 03:17.850 --> 03:25.770 So basically what I did was in the graph editor, let me just duplicate this out and show you I'm going 03:25.770 --> 03:31.950 to save this real quick and my duplicate this bowling ball and drag it over here and kind of show you 03:31.950 --> 03:32.520 what I did. 03:32.760 --> 03:40.380 So it's on the ground and we'll set a key here and then we'll set a key over here and say it travels 03:40.380 --> 03:41.400 this this far. 03:41.640 --> 03:44.340 And so right now, it's just sliding across the floor. 03:44.580 --> 03:49.820 Let me just hide these two so we're not distracted by them right now. 03:49.820 --> 03:51.450 I'm gonna delete the key frame there, right. 03:51.450 --> 03:53.220 Clicking And then I'm going to turn that off. 03:53.970 --> 03:54.600 So they're hidden. 03:54.960 --> 03:59.340 So we basically have this is just sliding across the floor. 03:59.760 --> 04:06.750 But if we take and isolate this rotation, so it's going to be rotate Z and I can see that down here. 04:06.780 --> 04:12.240 And let's make both of these linear so it's easy on us. 04:13.530 --> 04:24.330 And now we can basically scrub through and take this last keyframe a hit w so have the manipulator and 04:24.330 --> 04:27.360 I'm going to hold down shift in middle mouse, drag this down. 04:27.580 --> 04:29.280 You can see the balls rotating. 04:29.530 --> 04:34.730 So I'm going to move it down a little bit and then just scrub the timeline it just visually check it 04:34.740 --> 04:36.420 and see it's still sliding. 04:36.420 --> 04:37.140 Someone to move. 04:37.390 --> 04:43.590 I'm going to move the keyframe down more so it'll rotate even more and then scrub it and check it. 04:43.590 --> 04:48.660 Now it's rotating too much, so I'll bring the keyframe back up. 04:48.660 --> 04:53.700 And then right now it looks like we're pretty close to that Goldilocks moment. 04:53.700 --> 04:55.470 Might be sliding a little much there. 04:56.070 --> 04:59.490 There is math, of course, we can do based on the radius of the object. 04:59.790 --> 05:07.170 But for most things and just the general idea of how to quickly get this stuff in, this is a pretty 05:07.170 --> 05:08.520 good way to go about it. 05:09.060 --> 05:11.380 Still looks like it's sliding or still. 05:12.810 --> 05:13.200 Yeah. 05:13.350 --> 05:16.200 So somewhere in here basically is what it looks like. 05:16.200 --> 05:23.100 And this is just take some, you know, back and forth and training your eye to kind of see what that 05:23.100 --> 05:24.090 rotation is like. 05:24.420 --> 05:29.820 The the beach ball is actually probably a little easier example to show that with so much going to bring 05:29.820 --> 05:36.060 those back from the outliner because I hid them, I can't select them to unhide them so I could open 05:36.060 --> 05:37.800 up the outliner from the window menu. 05:37.800 --> 05:43.380 And now I can type in a one to turn that on and I'll just turn the outliner off there. 05:44.190 --> 05:49.710 So the other thing that I want to talk about was how I slowed these things down, because they're going 05:49.710 --> 05:55.200 at a consistent rate and then they they both kind of slow down and especially with the rotation set. 05:55.440 --> 05:56.280 How do we do that? 05:56.290 --> 06:04.470 So basically, I took a keyframe at the when we had the infinity turned on and then I just dragged it 06:04.470 --> 06:04.860 out. 06:04.860 --> 06:06.090 So it slowed it down. 06:06.090 --> 06:09.390 So basically was a straight line here. 06:10.080 --> 06:13.380 You know, this key frame was not an auto tangent. 06:13.380 --> 06:16.590 It was, you know, a straight line just like the other ones. 06:16.920 --> 06:23.490 So, you know, it'd be like going over here and setting a key frame in this infinity space here. 06:23.730 --> 06:29.010 So I just had s so I made a new key frame because auto tangent was the default that's going to go flat. 06:29.310 --> 06:31.920 And that's fine because I'm trying to slow the ball down. 06:31.920 --> 06:35.880 So now I can just middle mouse drag holding down shift and pull this out. 06:36.300 --> 06:38.130 And that's how I slowed it down. 06:38.130 --> 06:46.650 But I made sure to do both the rotation and the translation together so that the rotation slows down 06:46.650 --> 06:50.070 an equal amount relative to the translation. 06:50.430 --> 06:51.840 So that's how I did that. 06:51.840 --> 06:59.250 And then the last thing I wanted to show you was a little kind of overshoot thing with the beachball 06:59.370 --> 07:01.320 that we haven't done yet. 07:01.500 --> 07:05.370 So it slows down and then just comes to a complete stop here, which is not very believable. 07:05.670 --> 07:09.180 So what we can do and let me just go in here and clean up these. 07:09.660 --> 07:14.460 Yeah, these are old keyframes or at least just get them all lined up on the same key so we don't have 07:14.460 --> 07:15.560 stray keys out here. 07:16.020 --> 07:22.110 So what I can do and one really cool feature I use pretty much every day, almost every hour of every 07:22.110 --> 07:27.060 day when I'm animating is choosing a place in the timeline. 07:27.450 --> 07:32.040 And for me it's going to be a place I want the I want the ball to roll backward. 07:32.220 --> 07:36.360 But we need to put a key frame out here, you know, because I'm going to play in time and we need a 07:36.360 --> 07:43.110 place over here to key back to have it roll back so I can just pick somewhere that I already have the 07:43.110 --> 07:45.060 rotation values already set. 07:45.060 --> 07:48.060 And I know if I were to bring it over here, it's going to work. 07:48.060 --> 07:49.650 I could set a key copy paste it. 07:49.950 --> 07:55.230 But there's one tool here that if we just middle mouse drag from some point in the timeline, you can 07:55.230 --> 08:01.800 see nothing's moving now because I have my middle mouse dragged down so I can move this kind of value 08:01.800 --> 08:04.740 in time here to wherever I want it to and let go. 08:04.740 --> 08:11.820 And it s and so now when we scrub, it's going to take that key frame and bring it back and put it wherever 08:11.820 --> 08:13.890 I let go and then hit s. 08:14.190 --> 08:19.510 So it looks like I think I need a little more distance here, so I'm going to grab one, do like frame 08:19.620 --> 08:22.080 five and drag it a little further out and it. 08:22.080 --> 08:25.770 S so now when I scrub it rolls backward. 08:26.190 --> 08:30.810 So that's kind of like a little trick to get like a free keyframe, especially when you're dealing with 08:30.810 --> 08:31.500 rotations. 08:31.500 --> 08:34.200 And I don't want to like, try to figure out the rotation again. 08:34.470 --> 08:40.200 Well, I've already figured it out in this section so I can just take advantage of that and M. M. section 08:40.560 --> 08:44.670 like a frame over here and just put it over here and let go and hit s. 08:45.060 --> 08:50.310 So with that, we are done with this ball exercise and I definitely encourage you to do this again and, 08:50.670 --> 08:55.980 you know, go back and watch this and really understand these concepts and get them in your and your 08:55.980 --> 08:57.930 mind about how to think about animation. 08:57.930 --> 08:58.200 Right. 08:58.200 --> 09:01.260 Because we're animating specific things every time we animate. 09:01.590 --> 09:02.490 You know, no. 09:02.490 --> 09:05.730 Two things are going to ever move quite the same. 09:06.360 --> 09:08.580 So you want to try to think about the properties. 09:08.580 --> 09:09.690 How heavy is this thing? 09:10.020 --> 09:12.210 You know, how what's the surface like? 09:12.210 --> 09:12.450 Is it a. 09:12.500 --> 09:18.530 Rough surfaces that have more friction, is it you know, can is a very elastic it's going to bounce 09:18.530 --> 09:23.480 a lot, all these things we need to take into consideration when we're animating, because that's going 09:23.480 --> 09:29.270 to affect the type of animation we're going to do on, you know, with all of these principles now that 09:29.270 --> 09:34.420 we understand with squash and stretch and timing and spacing and all of these types of things. 09:34.430 --> 09:36.950 So things we're watching this little section. 09:36.950 --> 09:40.100 And in the next one, we're going to do a little more complex animation. 09:40.280 --> 09:40.970 Thanks for watching.