Icon That Tracks a Target

Scenario

You have an icon (a 2D sprite or 3D object) which you want to track the position of an object, such as a target marker for a missile "locked on target" effect.

Setup
  1. Add a Transform Constraint set only to position and set the target to the object you want to track.
  2. Add a Billboard Constraint to make it face the camera. (Leave the target empty to automatically use the main camera.)