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Lesson 6. Station Identification > Creating side-to-side motion

Creating side-to-side motion

To add more interest and movement to the pogo stick animation, you will nest one of the Bounce compositions inside a new composition set with side-to-side motion. This motion is created by using the Rotate and Position properties.

  1. Create a new composition, type Sideways Comp for the name, set the Frame Size to 400 × 340, the Frame Rate to 30 fps, and the Duration to 15:00.

  2. Drag the D/Bounce composition from the Project window into the Time Layout window.

    You will set Position keyframes and animate the left-right motion so it moves a larger distance at first and gradually moves back and forth less and less until it stops at 3 seconds. You'll set keyframes every 15 frames, which ensures that each keyframe corresponds to when the pogo stick is in the down position.

    First, you'll display a proportional grid in the Composition window as an aid in positioning the layer.

  3. Press Alt (Windows) or Option (Mac OS) and click the safe-zones icon at the bottom of the Composition window.


    Figure .


  4. Set the current time to 00:07, and position the cat illustration centered at the third ver-tical grid line and aligned with the bottom of the screen. (The position coordinates for the layer, displayed at the bottom of the Info palette, are approximately 150, 220.)


    Figure .


  5. In the Time Layout window, set an initial Position keyframe.

    You will now position the layer left or right of the center position, without changing the vertical position. To make this easier, you'll use a keyboard shortcut again to constrain movement, this time to the horizontal axis.

  6. Move the current-time marker to 00:22. Start dragging horizontally, press and hold Shift, and then drag the illustration to the right between the fifth and sixth vertical lines on the grid. (Position coordinates are approximately 273, 220.)


    Figure .


  7. Move the current-time marker to 01:07. Start dragging horizontally, press and hold Shift, and then drag the illustration to the left between the third and fourth vertical lines on the grid (approximately 175, 220).


    Figure .


  8. Move to 1:22. Start dragging horizontally, press and hold Shift, and then position the layer on top of the fifth vertical line (approximately 250, 220).

  9. In the Time Layout window, select the keyframes at 01:07 and 01:22, copy them, and then move to frame 2:07, and paste.

  10. Move to 3:07, and position the layer on the center line of the grid (approximately 200, 220).


    Figure .


  11. Save the project. In the Time Layout window, drag the right work-area marker in to 04:00 seconds, and press Alt-0 (Windows) or Option-0 (Mac OS) to preview. Since this is a nested composition, you won't see the alpha outlines—you'll see a rectangular shape instead.

  12. Select the Motion Blur switch for the layer, but do not select the Enable Motion Blur button above it.


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