![]() You can clearly see the motion of the Han (Chuck) slows down during the three shots and then speeds back up.Oh, as a bonus you get 3 Han Solo birds to shoot. Why is it better? First, it's in space - so I don't have to worry about acceleration. Just based on the level layout, there wasn't much room to shoot backwards. I suspect the problem might be with the backwards shots. If the bolt speed was based on the bird speed, there should be a much larger difference in speeds. If I look at the horizontal motion of the bird after it was shot, I get an x-velocity around 20 m/s. This shows a difference in speeds - but just a little bit. What if I shoot forwards with one bird and then backwards for the next? For three forward shots, I get an average x-component of velocity of 45.09 m/s and -37.35 m/s for the backwards shot (but the bird is moving in the positive x-direction). Also, a "backwards" shot would be slower. But is there another reason? What if the blaster bolt speed depends on the speed of the bird as it shot the blaster? So, a bird moving in the same direction as the shot would produce a higher speed relative to the background. There is still the possibility that these bolts all have the same speed and I am just seeing a large measurement error. To find the magnitude of the velocity, I just use the following: I can also do something similar for the y-velocity. If I fit a linear function to the x-position of the blaster plots, I can get the x-velocity for each one. This just means that I will just look at blaster speeds AFTER the bird shoots. I guess the game goes into "slow motion mode" when the bird shoots the blaster. Let me play around with my video and see if I can get a video without a changning frame rate (if that's what is actually happening).Īfter playing around a bit with both the Facebook version of the game and the one on my phone, it seems this is a real effect and not something created from my screen capture. ![]() Nothing looks crazy here now that time isn't in the plot. Why do I think this is a game problem? Here's why. This one slows down while the shots are fired and then speeds back up. I prefer Tracker Video Analysis (free).Ī normal bird (without firing blaster bolts) would have a constant horizontal velocity. You can get his data by making a video (screen cast) of the game and then using video analysis. Here is a plot of Chuck's vertical position on a particular level. I did this before with the normal game, but I need to make sure things still work the way I expect. Star Wars Scaleīefore I get to the blasters, let me look at the scale of the game. It's the blaster bolts that I find interesting. Instead of increasing his speed when you tap the screen, he fires three blaster bolts. In particular, the yellow bird (named Chuck) is cast as Han Solo. What's different in ABSW? It's essentially the same as the normal Angry Birds except that the birds are now cast as Star Wars characters. Oh, also you can play Angry Birds Star Wars (ABSW) for free on Facebook. Why now? Well, I didn't want to look at any Angry Birds physics until I finished looking at friction in Bad Piggies - but I could only hold out for so long. It was just a matter of time, wasn't it? You knew that at some point I had to look at Angry Birds Star Wars.
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