If you've been using the 3D Camera Tracker a couple of times I bet that you have come across the following issue before:
'No depth from a tripod pan solve' shows up at the bottom of the target icon and the icon sits flat on your footage. You may also notice that all of your track points are the same size, indicating they are all equal distance from the camera. What is going on?
When you walk along the street you may notice that static objects at different distances seem to be moving at different speeds. The further they are away, the slower they seem to move. The closer they are, the faster they seem to move. This is called the parallaxing effect.
The 3D Camera Tracker uses this effect as a basis to figure out how far object are from one another in your 2 dimensional footage layer. However, if the camera does not move around the scene very much, e.g. it is mainly a panning movement, the tracker cannot derive any depth information because there are no parallaxing objects in your shot.
In those cases, the 3D Camera Tracker might determine that it is a panning shot and not give you any depth information with the warning 'No depth from a tripod pan solve'.
But that isn't a reason to panic as this warning is usually not a problem. Why?
Because the camera does not move around within the depth of the scene, you can attach objects to the 'flat' track points oruse the 2D motion tracker I demonstrated in this Adobe After Effects tutorial to link other layers to your camera's movement and it will almost always work just as good.
So don't freak out when you see this warning, it's simply telling you your scene does not contain any depth information - and for most tracking scenarios it won't have to.
Finally, let's look at some properly tracked footage and what you can do with it. And even here, there might be a few common problems that are worth exploring.