Hi Jesse,
those parameters refer to RealityCapture’s XMP coordinate system (https://dev.epicgames.com/community/learning/knowledge-base/mozL/capturing-reality-differences-between-exported-coordinate-systems-in-realitycapture#:~:text=and%20Y%20axis.-,Same%20as%20XMP%20coordinate%20system,-The%20XMP%20coordinate).
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