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In this movie we will use animation curves to create a bounce animation for this monster's body. If you are following along, you can open up Creating_Bounce.fla from the Chapter 3 folder or you can just have a movie clip on the Stage. On the Stage I will dive into the Spider movie clip and then I am going to lock all the layers except for the Body layer. The Body layer is already a movie clip, it's an instance of a movie clip called Body. What I am going to do is create a motion tween. So I will right-click or Ctrl-click the body on the Stage and choose Create Motion Tween and I am going to move the body up just a little bit using my keyboard and then what I am going to do is go to the last frame here and on the last frame, which is frame 12, I am going press Down on my keyboard to move the body down a little bit.
Now I don't want to do a really drastic animation, I want to do something simple. I just want to look like the monster's body is being affected by a walking. So it's going to bounce up and down a little bit. So I will select the body animation then I will jump over to Motion Editor. Now I am going to create a custom easing curve that's going to loop a little bit. So it's going to start at 0% and end at 0% and in between it going to go up and down. So I am going to scroll all the way to the bottom in the Motion Editor and add a new custom Ease and I will expand my custom Ease and scroll down so I can see it all the way. I am just going to expand the Motion Editor a little bit and then I will select the last box in the custom Ease, click and drag that all the way to the bottom and then what I will do is add some control points to this animation.
So I will put 1 at frame 4, so then Command-click on frame 4 and drag that all the way to 100. Then I will put 1 at frame 6, so I will Command-click at frame 6 and drag that 1 down to about 50. It doesn't matter if it's exactly at 50. Then I will create another one at frame 9. So I am going to Command-click at frame 9, Ctrl-click on the PC, I will click and drag the control point up to about 85%. Again, we are not looking for an exact amount here. I just want it to be random when it's applied so that the monster will bounce up and down.
So with my custom Ease in place, I am going to scroll up and apply the custom Ease to my Basic Motion and then I will test the movie and watch monster bounce up and down as it moves, Command+Return on the Mac, Ctrl+Enter on the PC. There is our bouncing monster animation. So remember that when you are creating your custom animation curves, you don't have to be limited to a specific type of curve but you can get creative to create cool, natural feeling animations.
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