Even if an accidental feature was found, the camera’s movement is so fast that the feature jumps around the screen, making it impossible for the 3D Camera Tracker to follow its movement. Notice that the individual frames of the footage are extremely blurry and there are no features, no distinguishable shapes for the tracker to lock on to. Have a look at the following image sequence, taken from my After Effects building destruction tutorial.ĭuring the explosion, the cameraman dives for cover behind the concrete barrier and the camera’s movement is all over the place. There are 2 likely reasons for why that is happening! The Camera Movement is too fast You import a piece of footage, throw the 3D Camera Tracker onto the clip and then you get the following error message: One of the most common problems that people encounter is that the 3D Camera Tracker ‘just does not work’. Now that we understand the basics of how the 3D Camera Tracker works, let’s look at the most common scenarios of why it might fail! On the right side the size of the solved 3D track points represents how far they are from the camera. In the screenshot below you can see that the 2D track points are all the same size as they have no 3D position. It will try to infer the 3D position of these track points based on how they move as a group and then derive the movement of the camera from this data. Using this cloud of 2D track points, the 3D Camera Tracker then tries to ‘solve the camera’. This generates a cloud of 2 dimensional track points on your footage. The tracker will try to find as many features as possible in your footage and track their movement from frame to frame. Moving objects like people and cars are not features and tend to interfere with the 3D camera Tracker. A feature is a clearly distinguishable visual shape in your clip that represents a fixed location in space. The 3D Camera Tracker works by analysing your footage frame by frame and detecting features that it can track. How the 3D Camera Tracker Worksīefore we look into why the 3D camera tracker does not work, we first need to understand how it does work.
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I have a full tutorial on how to use the 3D Camera Tracker in Adobe After Effects as a part of my 3D Integration VFX tutorial series.Īs great as the 3D Camera Tracker is, there are a number of common problems that people encounter when trying to track their footage and this tutorial will explain what is going wrong and how you can fix it. Assuming the tracking data is spot on, you can then place other visual elements in the 3D space of your scene and they will follow the movement of the camera correctly. The 3D Camera Tracker in Adobe After Effects is a powerful tool that lets you analyse your footage and extract information about the movement of the real life camera used to film the scene.