Hello,
For the masks, we recommend exporting the undistorted images from RealityCapture since they are used to create a model. The undistorted images are created after the alignment and can be exported in the Registration export.
Make sure that the information in the CSV file is the correct information you need. This is the format of the exported file:
$ExportCameras($(imageName)$(imageExt),$(x),$(y),$(z),$(yaw),$(pitch),$(roll),$(f36),$(px),$(py),$(k1),$(k2),$(k3),$(k4),$(t1),$(t2)*
You can see that the focal length is exported in the 35mm format (f*36),so be wary of that.
You can adjust the export formats by modifying the XML files in the installation folder. The calibration.xml file contains this specific format.
Check the rotation values and ensure that the axes are correct in the third-party party, which I assume they are since the model looks all right.