 Hello, Rhett here. So Angry Birds Space, super popular. And oops, I messed this up. And everyone wants to analyze this. So I'm really going to try to go as quick as I can and show you how to analyze, how to play with Angry Birds Space using some free tools, in this case, Tracker Video. And so hopefully it won't be too long or too complicated, blah, blah, blah, blah. OK. So I've already opened Tracker Video. You can get that. I'll put the link somewhere. It's free, runs on everything you'd want. And I made a video. Now, the video, how do you make a video? You could just use a video camera and record your phone. I use the Mac App Store version of Angry Birds Space. So it runs on my desktop. And then I can use screen capture, like I'm doing here, to get a video of it. That's what I did. And then I've already opened that and dragged it in here. And this is something that comes up. You'll see, oh, these frames are messed up. So depending on how you capture a video, it may mess up some of the frames. If you just ignore this, you'll probably be OK. So I'm going to say fun. OK, so here's the whole video. One thing you'll notice, I don't need this first part. So I'm going to cut that off. I'm just going to scroll forward. And the other thing you'll notice, because it helps a ton, is when you start the level, zoom out all the way. When you zoom out all the way, then the screen won't, the background won't move. And you won't have to adjust your coordinate system. And that's going to make your life way happier, way happier. So zoom out all the way before you shoot, whether it's on the iPhone or whatever. Now maybe you don't play that way, but zoom out. OK, now I'm going to just scrub forward here until I get to the shot that I want. I'm just going to do this first shot. And right there, I'm going to back up. OK, let's go forward one frame to the handlet right there. Now this is right down here. You see it says frame 190. I'm going to go up here and click the video proper clip settings and start the frame at 190. Why? Because that way, if I add in new masses or anything, it goes back to this starting frame. Why keep that other stuff? You could do the same for the end, but I never do. Why? I have no idea. OK, so now the next thing is to put the coordinate axis in there. So I'll click coordinate axis. And in this case, for Angry Birds Space, you want to put this right in the middle of the asteroid. That way, if you want to do radio coordinates or anything like that, you already have it. If you put the coordinate system over here, then it's going to be more difficult to calculate whatever you want. You could do it, but I'm just going to eyeballing it here. I've already looked at this asteroid before, and I'm pretty sure that's about the right location. You can always move this later. The next thing is to put the scale in here. So I'm going to click right here, New Calibration Stick. And then it's hard to see, but it's right here. I'm going to move this down here. Let me zoom in so you can see a little better. Oops, what happened? OK. And there's my slingshot stick. So I'm just going to put one end at the bottom, one end at the top. And then I'm going to say this is 4.9 meters just from my previous things. You didn't show up very well, but that doesn't matter. It's done. OK, zoom back out a little bit. You could use anything to scale the video that you want. You could define your own scale, but I'm just sticking with what I had before. OK, moving right along here, now we're going to start tracking the motion of this bird. So I'm going to go to Create, Point Mass. And then if you hold down the Shift key, you can just click on the bird. It will advance the frame. And you can keep on doing this as long as it makes you happy and wait for a second. OK, right here. Now here's the other fun thing is to click on this, go to Auto Tracker, and then you can make the thing automatically track. Let's see. Control Shift-click this guy. And then you can change how much it's going to evolve and look ahead and all that sort of stuff. Usually it's fine. You could do clicking Search right here. We'll just make it go as far as it can go. But we're going to search Next. And you can make sure it doesn't make a mistake. But you can do it a lot faster. Move it over here. It may lose it once it hits this thing because it'll have like a poof. If that does, we'll just fix it. Going to Poof. OK, let's see. It didn't find it. So now I can just click that. I can click it again. I can click it again. So you can switch back and forth. Sometimes it might skip a frame when you do this. But I'm going to click it until I feel comfortable that it's getting back in something more typical. OK, let's see if I can search it manually now. No, it didn't find it. OK. And there's probably, let's just close this. I'm not going to get all this. OK, I skipped a frame. That's fine. I'm just going to click some data because we're not really doing a real analysis here. I'm just showing you how to get it. And if you worst case, you just click on all these guys. It doesn't take that long. OK, so I have enough data. So let me move my little video down here. OK, so here you can plot whatever you want. This is x versus time. Maybe it might be better to change this to y versus x. And you can get the trajectory. If you right click on this and go to Analyze, then it'll show it in a nicer screen. And here you could do whatever you want. You could fit functions to this, which doesn't make sense. So instead, let me plot the x versus time. Let's go back over here, x versus time, and analyze this to get the, OK, so it has the old one in there, too. I can just turn that off. Now I want to get the slope of this line right here. So I can just highlight that stuff and click Fit. And I want a line. And that gives me the slope right there. So the slope of this line is the x velocity. You could do the same for the y velocity. So this has a whole bunch of nice stuff in there, like the magnitude of the velocity versus time. Or you could do magnitude of velocity versus r. That's a pretty nice graph right there. So let's turn that off. So this was to say it was going at that's during the time. Oh, here, this is cool. If I'm not sure, this is r, not time. But if I step back through the video, you can see here it's highlighting on the graph where that is. Cool? So you could really answer all sorts of questions that you want here. I can't remember what I was actually going to do. This is not the best level. What if you want to look at the trajectory? Do I have time? That's eight minutes. OK, quick. Go back to the trajectory. I want to show you some, oops, x versus y. OK, one of the things I do is plot the trajectory versus my model. And you can do that in track or video. But I don't know how. So over here, I have x, y time data. If I just highlight the stuff that I want, move back up here. I'm going to go down here to highlight all this. And I click Copy Selected Data. Oh, you can't see this. But full precision. Then I can go to a text editor, text editor. And I'm going to make it plain text and paste it. And then I'm going to get rid of this stuff. You can leave it in there if you want. But I know it's t, x, y. Just makes it easier for me. I'm going to save it. Save this. Doesn't want to save. Oh, it's thinking about it. OK, I'm going to pretend like I saved it. Yeah, let's do that. But anyway, then I'm going to skip that part. You could, oh, there it goes, whatever. You could then use Python or even Excel or whatever to plot this data. You could import this text file into Excel and get time, x, and position. So you have everything you need. But that's really just a really basic. I'm trying to think if there's any other tricks. Oh, the other one that I always forget. If you want to measure the radius of this asteroid, you could go to Create and then go to Measuring Tools, Tape Measure. And then it uses the same scales before. And you can just put that wherever you want. OK, that's 10 minutes. So you now have all the power to do the analysis. So use it for good and not for evil. And that's all. OK, have fun.