In this tutorial we will show you how to align individual scans if you discover that individual scans are incorrectly aligned while working on a project.
Open your project. In this example scan S_L_W_019 is wrong aligned, which is clearly visible in the top view. Therefore, it must be aligned.
In a created floor plan it can be seen that the scan position has been rotated and translated.
Archive the project to make a copy of it: Go to File -> Archive project.
After the project has been archived as a *.zip file, you will receive a message asking whether you want to delete the existing project now. Select “No” so that you have both the original project and the copy.
Open one or more other scans that overlap with the incorrectly aligned scan. In this example, we are working in Scan S_L_W_018 under Registration -> Advanced Importer (F6), double-click the scans or open the scans with the Panorama tool. Select the 3D point tool and click identical points, which you can correctly identify in the panorama of the incorrectly aligned scan and in the panoramas of the overlapping scans, which are aligned correctly. In this case we have set four points.
After you have identified the points, select one of the 3D points and export it as an.*xyz file by choosing “Export Points” in the Job Editor.
Give the *.xyz file a meaningful name and click on “Save”. This file is automatically saved in the 3D folder.
Now open the created copy of your project.
Open the Advanced Importer and delete all scans except the scan that is not aligned. The fastest way to do this is to create a cluster for all scans to be deleted, drag and drop the scans there and then delete the newly created cluster.
Now open the incorrectly aligned scan in the panorama view and mark the same points with the 3D point tool as in the other project.
Go to Registration and select the transformation calculator.
Now add the.*xyz file that you have already created.
Import the.*xyz file.
Print “Find constellations” so that the match is searched for automatically.
Check the Sigmas. If they are close to zero, you can create the alignment.
A message appears indicating that all standard views must be recalculated. Click on “Yes”.
It is not necessary to recalculate the standard views. You can simply cancel all calculations. In the File menu, you can see the most recently opened projects. Now open the original project. In the Advanced Importer delete the scan that is wrongly aligned. In this example we delete the scan S_L_W_019_0.
Then we add the transformed scan to this project. This scan can be added using the *.lsdx file from the transformed project. This is located in the _pointclouds folder.
If the Registration module is activated, you will be asked if the scans are already registered. Confirm with “Yes”.
You can now start the alignment of the project. Now all scans are correctly aligned.
Your previously calculated jobs must be recalculated. However, the definitions are not lost during the entire process.