3D Compositing with Action > Action: 3D Paths >
Positioning Objects on the Path

Use the Position On Path settings in the 3D Path or Banking tabs to offset the position of attached objects along the path and beyond. For open paths, if you offset past the first or last points on the path, the position is extrapolated accordingly. For closed paths, if you offset past the first or last points on the path, the attached object continues on the path with a tangent interpolated from the first and last normals.

Offset field
  Displays the amount of offset to apply to the attached object on the 3D path. Use this field to animate the attached object along the path.
Offset box
  Select whether to offset the attached object from the path in a relative mode (expressed as a percentage of the path) or absolute mode (expressed in pixels).

NoteThese settings are repeated in the 3D Path and Banking tabs to make it easier for you not to have to switch tabs to change the settings. The same settings are reflected in both tabs.