< Previous | Contents | Next >
A frame between the two keyframes you’ve rotoscoped that needs further adjustment
After adjusting the in-between frame
6 When you’re finished making adjustments between your first two keyframes, move the playhead farther along and add keyframes as necessary to make the window follow the motion of
your subject.
In general, look for the frames where your subject’s motion starts, stops, speeds up, slows down, or changes direction. As you work, it’s good to try and add the fewest number of keyframes
TIP: If you’re isolating a subject with a complex shape that moves quite a lot, you might consider using multiple simple overlapping shapes to track and rotoscope it, rather than a single complicated one, to make the task easier.
TIP: If you’re isolating a subject with a complex shape that moves quite a lot, you might consider using multiple simple overlapping shapes to track and rotoscope it, rather than a single complicated one, to make the task easier.
TIP: If you’re isolating a subject with a complex shape that moves quite a lot, you might consider using multiple simple overlapping shapes to track and rotoscope it, rather than a single complicated one, to make the task easier.
you can to ensure smooth motion from one to another. Too many keyframed adjustments made too close together for a smoothly moving subject risks adding jerky motion if you’re not careful. On the other hand, if you have an erratically moving subject, you may have to add more keyframes, possibly frame by frame, to achieve the desired result.
7 When you’re finished rotoscoping the window, be sure to click the Clip button to switch back to Clip mode, so you can trim the window’s shape across every keyframe you’ve just created, if necessary. This will also prevent you from accidentally adding more keyframes if you select other shapes.
This technique requires a bit more work then simply using the Tracker, but it’ll let you quickly adjust the animation of a window to more tightly conform to a moving subject when you need an adjustment to be specific to that subject alone. You can also use this technique to reposition
specific motion path points in the middle of an otherwise successful track to make them fit better, or to add keyframes to the beginning or end of a track when the subject moves offscreen but the window does not.
Viewing a Window’s Motion Path
You can turn on the motion path of the window you’re tracking by choosing Show Track from the Tracker Option menu.