Changing Tracking Direction

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‌Changing Tracking Direction

You can also track backwards: go to the end of the shot, reverse the playback direction , and play or single-step backwards.

You can change the tracking direction of a tracker at any time. For example, you might create a tracker at frame 40 and track it to 100. Later, you determine that you need additional frames before 40. Change the direction arrow on the tracker panel (not the main playback direction, which will change to match). Note that you introduce some stored inconsistency when you do this. After you have switched the example tracker to backwards, the stored track from frames 40-100 uses lower-numbered reference frames, but backwards trackers use higher-numbered reference frames. If you retrack the entire tracker, the tracking data in frames 40-100 will change, and the tracker could even become lost in spots. If you retrack in the new direction, you should continue to monitor the track as it is updated. If you have regularly-spaced keyframes, little trouble should be encountered.

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