Thank you. We export a camera registration csv file with these settings
<Configuration id="{2D5793BC-A65D-4318-A1B9-A05044608385}">
<entry key="calexTrans" value="1"/>
<entry key="calexHasDisabled" value="0x0"/>
<entry key="MvsExportScaleZ" value="1.0"/>
<entry key="MvsExportIsGeoreferenced" value="0x1"/>
<entry key="MvsExportIsModelCoordinates" value="0"/>
<entry key="MvsExportScaleY" value="1.0"/>
<entry key="MvsExportScaleX" value="1.0"/>
<entry key="MvsExportRotationY" value="0.0"/>
<entry key="MvsExportcoordinatesystemtype" value="0"/>
<entry key="MvsExportNormalFlipZ" value="false"/>
<entry key="MvsExportRotationX" value="-90.0"/>
<entry key="hasCalexFilePath" value="1"/>
<entry key="MvsExportNormalFlipY" value="false"/>
<entry key="MvsExportNormalSpace" value="Mikktspace"/>
<entry key="calexHasUndistort" value="-1"/>
<entry key="MvsExportNormalFlipX" value="false"/>
<entry key="MvsExportRotationZ" value="0.0"/>
<entry key="calexFileFormat" value="Internal/External camera parameters"/>
<entry key="MvsExportMoveZ" value="0.0"/>
<entry key="calexFileFormatId" value="{0CA18733-1EBC-4254-9974-17197EB409BD}"/>
<entry key="hasCalexFileName" value="1"/>
<entry key="calexHasImageExport" value="-1"/>
<entry key="MvsExportMoveX" value="0.0"/>
<entry key="MvsExportNormalRange" value="ZeroToOne"/>
<entry key="MvsExportMoveY" value="0.0"/>
</Configuration>
Then we import it into open3d which is y-up coordinate system