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 existing 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 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 tab, then choose the Adjust Item tool from the 2D transform tools in the Toolbar. For more information on using filters, see Using Filters.

  2. In the Filters tab of the Inspector, Control-click the Center parameter, then choose Track from the shortcut menu.

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

    Note: In the Filters tab, a behavior icon 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.

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

    The filter’s center is tracked to the clip.

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