Regression in Pointcloud 3DTiles tileset data

[EE]

When updating from 1.6.3 to 1.7.5 we noticed the following regression, especially the height is weird.
Expected

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{'Height': {'maximum': 586.442 ± 5.9e-04, 'minimum': 406.613 ± 4.1e-04},
 'Latitude': {'maximum': 0.7694819644872486 ± 7.7e-07,
              'minimum': 0.7692585288653095 ± 7.7e-07},
 'Longitude': {'maximum': -2.0872437834475623 ± 2.1e-06,
               'minimum': -2.0874694308012236 ± 2.1e-06}}
Actualy

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{'Height': {'maximum': -6356138.153753753, 'minimum': -6356339.057442965},
 'Latitude': {'maximum': 1.5611652318912046, 'minimum': 1.5359569979858492},
 'Longitude': {'maximum': 1.8649031691950797, 'minimum': -3.046626475879601}}

Our flow is: importPoints, exportPoints(PointsFormatCesium)

Is there a relevant changelog available for what could affect this?

[Alexey Pasumansky]

Hello EE,

Please check, that the coordinate system is properly selected during import and export operations.

Also check, that there are no boundary shapes taken into account.

[EE]

Using the Python API, this is the code we use:

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            doc = Metashape.Document()
    doc.addChunk()
    doc.chunk.crs = Metashape.CoordinateSystem("EPSG::3857")
    doc.save("PSP.psx")
    doc.chunk.importPoints(
            projected_file,
            crs=Metashape.CoordinateSystem("EPSG::3857"),
        )
        doc.chunk.exportPoints(
            os.path.abspath(output_path),
            format=Metashape.PointsFormat.PointsFormatCesium,
        )

Is there anything that should be changed between 1.6 and 1.7?

I am not sure how to check the boundary shapes

[Alexey Pasumansky]

Hello Evert,

Could you please check, if setting WGS84 coordinate system for Cesium export resolves the problem:

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chunk.exportPoints(os.path.abspath(output_path), format=Metashape.PointsFormatCesium, crs=Metashape.CoordinateSystem('EPSG::4326'))

[EE]

That does indeed seem to change the behaviour.
The values look similar (not exactly, few meters shift)

Code: [Select]

{'Height': {'maximum': 588.2065221817237, 'minimum': 411.24811327206055},
 'Latitude': {'maximum': 0.7694814403213569, 'minimum': 0.769259291829557},
 'Longitude': {'maximum': -2.08724332318532, 'minimum': -2.087468395182987}}

I thought Cesium was in ECEF and not 4326?