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Explanation

This error arises when Theia3D is not able to adequately track the people identified within the 2D views throughout 3D space. There are two primary causes of this error:

1. An incorrect calibration file was loaded.
   If an incorrect calibration file was loaded, meaning that the camera system is not properly calibrated, then it will not be possible for the people identified within the 2D videos to be tracked throughout 3D space.
2. The Analysis Bounding Box was used with dimensions (length, width, height) of 0.
   If the Restrict skeletons to bounding box option was selected but no dimensions were provided for the bounding box, the people visible in the 2D camera views cannot be tracked in 3D space and the Track people not complete error message will appear.

Possible Solutions

1. Check the Restrict skeletons to bounding box option.
   ‍If you intended to use the Restrict skeletons to bounding box option, either provide the dimensions of your desired bounding box or use the Use Camera Locations option to define the bounding box. If you did not intend to use the Restrict skeletons to bounding box option, deselect it. After making either modification, you will need to Run Analysis (without 2D) to update the person tracking and modelling results.
2. Check that the correct calibration was loaded.
   If an incorrect calibration file was loaded, the camera system may not be calibrated properly leading to improper 3D reconstructions from the 2D data. Review the position and orientation of the global coordinate system in each 2D camera view - they should all show the global coordinate system at the same position and orientation. If the global coordinate system is out of place, it is likely that an incorrect calibration was loaded. Locate and load the correct calibration file, and Run Analysis again.
3. Check that there are people sufficiently visible to be tracked.
   If there are no people or insufficient views of any people captured in the videos, nobody will be tracked. Be sure that your cameras are set up to sufficiently capture any participants with 3 or more cameras at all times, and record new movement trials.