3D Compositing with Action > Action: 3D Camera Tracking > Auto 3D Tracking > 
Defining the Auto Track Ground Plane
 
 
 

Although it is not mandatory to define a ground plane in your image, it helps orient the reconstruction of the cameras.

To define the auto track ground plane:

  1. Enable Define.

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    NoteIf you selected Pan and Tilt as the camera type (or if the Auto Detect switched to Pan and Tilt) the Plane Define button is not available. The rest of the settings in this group are still available, but only for orientation purposes.
  2. Select a minimum of three points in the image that represent the plane of the X/Z axes, such as the ground, a table, or any flat surface.

    The selected points appear as red squares with white crosses.

    TipYou may want to disable the tracker temporarily and point display options (or raise the transparency level) to help you find and select the plane points. You can also change the plane display size from the Icons section.
  3. Use the Position and Rotation controls to define the orientation of the ground plane.
  4. Use the Scale field to specify the scale of the scene.
  5. Disable Define.

    The plane is displayed as a red grid.