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Lesson 8. Film Loops and Buttons > Reversing an Animation

Reversing an Animation

In this task, you will add a second animation that is the reverse of the one you just created. You will copy the animation you created earlier and then reverse its sequence.

1.
Choose View > Sprite Labels > Keyframes.

Since you are now working with longer sprite segments, this is a more useful setting.

2.
With the score open and selected, choose Edit > Select All. Then choose Edit > Copy Sprites.

All the sprites in the score are copied.

3.
Select the tempo channel, frame 41, and then choose Edit > Paste Sprites.

You should see the entire set of sprites duplicated in frames 41 through 70, including the sound file and the tempo setting.


Figure .


The sprites you copied included a tempo setting in frame 1 of the tempo channel. That's why you placed the insertion point in the tempo channel at frame 41.

Now you will reverse the order of the sprites you just pasted.

4.
Select channel 3, frames 41through 60, and channel 6, frames 61 through 70. Choose Modify > Reverse Sequence.

To select these channels simultaneously, click channel 3, frame 41, and Shift+click channel 6, frame 70. This will also select channels 4 and 5, but that doesn't matter; since these channels are not animated, reversing them has no effect.

Now the second version of the animation, in frames 41 through 70, runs backward—that is, the paper floats from the folder on the right to the folder on the left.

5.
Play the movie and watch for the problem we introduced.

The animation now alternates: first you see the paper float from the folder on the left to the folder on the right, and then you see the paper float from the folder on the right to the folder on the left. Watch the playback head move in the score as you view the animation on the stage.

Notice the problem? You can see that the two pieces of the reversed animation occur in the wrong sequence: The paper first appears above the folder on the right, floats to the folder on the left, and then unexpectedly appears back in the folder on the right, where it floats directly up from the folder. You will fix this sequencing problem by adjusting the frames in which the two pieces of reversed animation occur.

6.
Select channel 3, frames 41 through 60, and move them to frames 51 through 70 in the same channel. Similarly, move channel 6, frames 61 through 70, to frames 41 through 50.

7.
Play the movie again.

The reverse animation is now working correctly. The paper floats back and forth between the two folders.


Figure .


8.
Save your work.


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