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In a tripod shot, no distance (range) information can be determined, so all tripod- shot trackers are automatically marked as “Far” once they are solved, meaning that they are directions in space (like a directional light), not a point in space (which corresponds to an omni light). For the purposes of display in the 3D viewports and perspective view, Far trackers are located at a fixed distance (the world size) from the camera, forming the surface of a sphere if there are many.
Far trackers can also be generated from normal 3D solves, if a point is determined to be far from the camera. This is typical for trackers on the horizon or clouds.
Far trackers in normal 3D solves "move along with" the camera. As the camera moves, the far tracker apparently moves with it. That's necessary so that it is always in the same direction. (Far trackers do not rotate with the camera.) If you see some points that are moving along with the camera, they are Far trackers (or you have set up a " moving object" in the shot to which the tracker is attached).
You can have zero-weighted far trackers, which are solved separately after the main solve, and without affecting the main solve, just like there are regular zero- weighted trackers.
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