X-Guide used Meshlab for postoperative verification, how did he come up with the error value after registration?

[ZWB123456789]

X-Guide used Meshlab for postoperative verification,（ In this process, a trained engineer first identified the precise location of the delivered implant in the postoperative CBCT with the X-Guide implant-planning software. Next, the preoperative and postoperative CBCT scans were registered by aligning the Sawbones structure in each scan via a rigid transformation. To generate the registration, polygonal meshes representing the outer Sawbones surfaces were extracted from the pre- and postoperative CBCT scans via conventional iso-surface thresholding techniques. The meshes were then cleaned of any artifacts and aligned in the open-source MeshLab software suite. Using the rigid transform defined by the MeshLab registration, the virtual preoperative implant plan was projected onto the postoperative CBCT scan, where its position and orientation are compared with those of the delivered implant.）I wondered how they did it, and our team tried a few times and found no results as they said

[stale[bot]]

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[alemuntoni]

I don't know how they did it. Maybe they used the housdorff distance to compare meshes? You should ask to the X-Guide team, not to us :)