Apple Motion 2 Betriebsanweisung PDF herunterladen (Seite 10)

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Track On the Fly marks on the bottom of the window

When you track an effect, marks for each tracked frame draw on the left of the current-time indicator because

tracking data exists for these frames.

Understanding Error Messages when Tracking on the Fly

The most common error you will see during tracking is a “Please Move the Current-Time Indicator...” message. The

following situations can cause this error message to appear. Some scenarios only apply to certain hosts.

• If you move the playhead past the end of the tracked region.

• If you don't play every frame (for example, you play with the Space bar instead of playing every frame).

• If you partially track an effect and deselect Track on the Fly, then move the playhead past the tracked region before

re-enabling Track on the Fly.

• If you press the Space bar to stop playback. When this happens, this interrupts the tracker render for the current

frame. Move the playhead back one frame and clear the cache to continue. Clearing the cache is described below.

When you get this error message, perform the following steps.

Move the playhead to a previously tracked frame in your effect.

Clear the cache that your host application created for the effect. To clear the cache, press the

Reset button

then

toggle a checkbox off and on, change an unused parameter in the effect or follow the directions in the dialog that

appears. If you try to retrack without completely clearing the cache, the motion tracker will not work correctly

because the frame that displayed the error message is already cached.

Working with the Tracker Center KF Control

The

Tracker Center KF

position controls set up the area to track. Use the Tracker Center KF control to set up your

tracking region, then adjust the Tracker Center KF position control if necessary for Þnetuning.

Understanding How Keyframes Work in the Motion Tracker

If the Motion Tracker tracks incorrectly, you can keyframe the

Tracker Center KF

control. The motion tracker treats any

frame as keyframed if the Tracker Center position at that frame is different from the track center at the previous frame.

Keyframes appear in blue along the bottom of the preview when Track on the Fly is selected.

If you create two Tracker Center KF keyframes with different values, the tracker will treat each point between these

keyframes as a keyframe.

The blue onscreen marks are internal to the Motion Tracker. While the Motion Tracker considers these frames

to be “keyframes,” these are different than the keyframes that are visible in your timeline.

Adjusting Tracking During the Effect

You may need to adjust the tracking if the tracked object changes orientation or is obscured by another object.

Keyframing the

Track Center KF

control is the best way to correct this. The onscreen Tracker Center KF crosshair control

does not follow the tracked object, but you can reset it to the location of the tracked object at any point in the effect

Tracked

Frames

Playhead

Tracked

Frames

Region that needs

to be retracked

Keyframe

1 2 ... 5 6 7 8 9 10 11 12

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