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Precision of spatial mapping
I have a question regarding the precision of the spatial mapping mesh. Often when I watch the mapping in unity the room gets recognized quite quickly, but some of the surfaces are off, sometimes even up to a meter. In some cases I scan a chair and the mesh fits fine, then I wander around in the room and come back to the same chair which was not moved in between, and the chair's mesh is off by a meter to one side. The whole room is usually not affected though, so it will not fix by adjusting the whole mesh, but it will lengthily rebuild the surfaces in question.
This does affect world anchors as well, which is annoying when I put effort into accurately placing a hologram in relation to my real room, and the next time I open the app it has moved by a meter to either side.
I attach some pictures. In the first one you can see a wall that is off by maybe 50 centimeters to the left. The second picture shows the room mesh from the device portal, and you can see a wall and on the ground the remains where this same wall got placed before and then was corrected.
Is this normal behaviour? Can I do anything to improve this? Are there any official statements about the precision of the scanned room?
I did run the sensor calibration various times. The room in question is quite large, I would estimate maybe 200 square meters, if this makes a difference.