Apple MA261Z/A User Manual - Page 735

IX Creating Keyframed Motion Paths in the Canvas You can create motion for a clip by repositioning it, and then setting keyframes to change the clip's Center parameter over time. By setting enough keyframes, you can eventually create the motion path you want. There is an easier way, however, which can produce more sophisticated results; you set up the motion in the Canvas using a motion path (in Image+Wireframe or Wireframe mode). Once you set the first center keyframe for a clip in its Motion tab, all subsequent changes made to that clip at different points in time introduce additional center keyframes. When you create two or more center keyframes, they appear in the Canvas along a line called the motion path. What Are Motion Paths? The simplest motion path is a straight line defined by two center keyframes. Once the first keyframe is defined in the Motion tab, any time you move the Canvas or Timeline playhead to another time and then move that clip's wireframe somewhere else in the Canvas, another keyframe is created automatically. For example, you define a center keyframe for a video clip at -160, 100. You then move the playhead 3 seconds later in your sequence, and drag the clip by its center point to 160, -100. The result is a diagonal motion path moving from the lower-left corner of the Canvas to the upper-right corner, shown below. When your sequence plays, the clip moves along this path, with its anchor point following the motion path exactly. A simple motion path results from the movement of a clip from this first center keyframe... ... to this second center keyframe. As you add additional keyframes, you can create more complex paths. For example, with the motion path above already defined, you can move the playhead to a time in between these two keyframes. With the playhead in between these two keyframes, moving the clip to -90, -90 adds a third keyframe to this motion path, shown next. In this way, you can create as many keyframes as you like, changing the shape of the motion path accordingly. Chapter 50 Adjusting Parameters for Keyframed Effects 735