Track Parameter Workflow

The Track parameter behavior allows you to track a position parameter of a filter to a reference feature of a clip, or to apply tracking data to a position parameter of a filter. For example, you can track the center of a Light Rays filter to a moving light in a clip.

Note: This behavior is only applicable to filters with position parameters, such as Scrape, Ring Warp, Light Rays, Slit Tunnel, and so on.

For a full description of the Track parameter behavior, see Track Parameter Behavior Controls.

To use the Track parameter behavior
  1. In the Canvas, position the center point of the filter over the reference pattern.

    In this simple example, the center point of a circle blur is positioned over the license plate of a car.

    Figure. Canvas window showing tracker onscreen controls.

    Note: To use a filter’s onscreen controls, select the filter in the Layers list, then choose the Adjust Item tool from the 2D tools pop-up menu in the toolbar. For more information on using filters, see Using Filters.

  2. In the Filters Inspector, Control-click the Center parameter, then choose Add Parameter Behavior > Track from the shortcut menu.

    In the Canvas, the filter’s onscreen control is replaced with a tracker. The Behaviors Inspector becomes active and the Track behavior parameters are displayed.

    Note: In the Filters Inspector, a behavior icon (a gear) appears next to the Center parameter, indicating that it is influenced by a behavior.

    If necessary, adjust the tracker in the Canvas. If the reference pattern you want to track is offset from the center of the filter, use the Offset Track checkbox. For more information on using the Offset Track parameter, see Tracking Obscured or Off-Frame Points Using Offset Tracking.

  3. Click the Analyze button in the HUD or Behaviors Inspector.

    The filter’s center is tracked to the clip.

    Note: You can make changes to the filter parameters after the analysis is performed.