Current Help System: PC-DMIS Laser (View Core Help)

### Rough Alignment

The Rough Alignment area contains buttons for the selection of points on the pointcloud and their corresponding points on CAD. The points are shown in the list boxes: Pointcloud Points and CAD Points. Num. of Pairs defines the number of pairs of points to be selected. The minimum number allowed is 6. The Deviation area shows both the average and maximum deviations between the CAD/pointcloud pair of points after the rough alignment is performed.

To select the rough alignment point pairs:

1. Specify the number of needed pairs in the Num. of Pairs box.

2. Select either CAD or Pointcloud points by clicking on the + button and then clicking on the point in the Graphics Display Window that you want to associate to that number. The corresponding Pointcloud or CAD point should be assigned to the same number.

3. Continue assigning each point in any order until finished. You may want to select the Pointcloud point and then select the corresponding CAD point.

4. To remove an existing point, select the point’s ID in the list box and click the – button.

5. To modify an existing point, select the point’s ID in the list box and click the + button and click on the new location in the Graphics Display Window.

6. Once the selection is finished click on Apply and the best fit transformation between CAD and Pointcloud points is computed and applied to the pointcloud

7. Undo button will undo the last alignment.

8. Deviation gives an idea about the quality of the alignment