Step 5: Reprojection to 3D¶
Purpose¶
Map the 2D bay plan and segmentation results back onto the original 3D point cloud so later trace and measurement work is grounded in the scan.
What the application does¶
The backend reprojects selected masks and geometry into 3D by using the projection metadata saved earlier. The result is a point-cloud view where the interpreted 2D work can be checked against the original scan.
What you do here¶
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Choose which segmentation groups to include. Enable the groups you want to carry forward, usually ribs and bosses first.
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Review the 3D preview. Check that the coloured overlays sit on the correct rib and boss geometry.
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Check masked and unmasked points. Toggle visibility to make sure the selected features are not drifting onto unrelated masonry.
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Confirm or adjust. If the reprojection looks wrong, go back to Step 3 or Step 4 and correct the source data before proceeding.
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Save the reprojection state before moving to Step 6.
Interface controls¶
| Control | What it does |
|---|---|
| Segmentation group toggles | Include or exclude each feature class in the reprojection |
| Masked / unmasked point visibility | Isolate one group for inspection |
| 3D preview canvas | Interactive point-cloud view with reprojected labels |
| Save button | Persists the reprojection state for Step 6 |
What to check before moving on¶
- The coloured points sit on the intended features.
- There is no obvious spatial offset.
- The result is good enough to trust for tracing.
Expected result¶
A confirmed 3D reprojection ready for Step 6.