Exported camera calibrations (.csv format) give rotation as 3 angles labeled heading, pitch, roll. The format control file calibration.xml has EulerFormat=“zyx” which I suppose indicates how the rotation should be composed from these angles. Please clarify the specific meaning of this notation, referred to to Euler angles - Wikipedia.
Moreover, no interpretation of the exported angles seems to agree with the actual (and displayed) camera poses. For example, for a row of 9 cameras in a gentle arc, that rotate almost exclusively around the vertical (Z?) axis, two of the angles fluctuate widely in a non-continuous manner, while the third stays roughly constant near 88 degrees.
Alternatively, can I export directly the rotation and/or projection matrices?
Heading, pitch and roll are the angles around axes (https://dev.epicgames.com/community/learning/knowledge-base/7yvm/capturing-reality-registration-export-and-camera-orientations)
You can set the wanted exports in the calibration.xml file.