I’m experiencing a strange issue while using RealityScan 2.1.
I exported a point cloud from RealityScan and uploaded it into Cesium, where it appears to be positioned correctly in space (as far as I can tell).
Then I exported the 3D model generated from the same point cloud using the SHARE command in RealityCapture. When importing this 3D model into Cesium, the model appears slightly shifted in X and Y relative to the point cloud, and its elevation is set to Z = 0 instead of the correct height.
The point cloud and the 3D model come from the same RealityCapture project, where they are perfectly aligned. Why do the point cloud and the model, which are coincident in RealityCapture, become misaligned once exported and loaded into Cesium?
i have worked with epgs 3004 and the elevation attached image was change manually close to point cloud
Good morning Bryan,
I apologize for the very late reply—I’ve been extremely busy these past few days.
I’ve checked the issue, and it occurs consistently with both RealityScan and DJI Terra.
To illustrate it, I’ve created two scenes on Cesium ion:
RealityScan scene: Cesium Stories
I uploaded a point cloud exported directly from RealityScan in EPSG:3004 coordinates (Monte Mario / Italy zone 2).
I then added two test 3D models exported from RealityScan: one in EPSG:3004 and one in EPSG:4326 (via the “Share” button).
The two models align perfectly with each other, but the point cloud appears shifted by several meters relative to the models.
Asset IDs used in this scene: 4555547, 4555546, 4555543.
DJI Terra scene: Cesium Stories
Here I uploaded two objects (Asset IDs: 4555415, 4555404).
Again, there is a shift of a few meters between the elements.
Visually, it looks like the same offset as in the RealityScan scene (though I haven’t been able to measure it precisely).
In this case, the point cloud remains in EPSG:3004, while the model was positioned manually: I converted the coordinates from the attached XML file (from EPSG:3004 to 4326) and applied the position on Cesium ion.
Now this creates many problems for me because I need to create scenes in which there are point clouds and models of underground utilities that in this way I cannot position with precision due to this error and positioning them manually is not a feasible solution.
If you need any other information I am at your disposal.
Best regards.
