The Pointcloud to Pointcloud alignment functionality allows you to best fit align two pointclouds which have been collected in two different reference frames that have some overlap. A typical example is two scans in two pointcloud commands, representing areas of a part that cannot be scanned in the same part orientation.
The alignment is done in two steps:
A rough alignment, where you select pairs of points in the overlapping area of the two pointclouds.
A refined bestfit, which tries to bring the second pointcloud as close as possible to the reference pointcloud.
To create a Pointcloud to Pointcloud alignment, do the following:
Ensure that you have two or more COP commands in the measurement routine that you can use for the alignment. PC-DMIS requires these elements so it can align the pointclouds.
Select the Insert | Pointcloud | Alignment menu option.
If you are in Command mode, you can type the COPCOPBF command in the Edit window between the ALIGNMENT/START and ALIGNMENT/END commands to open this dialog box.
The Pointcloud/Pointcloud Alignment dialog box opens:
Pointcloud/Pointcloud Alignment dialog box
For a complete description of the dialog box, see the topic "Pointcloud/CAD Alignment Dialog Box Description".
A temporary split-screen view of the two pointclouds appears in the Graphic Display window. You can use this view to visually see the alignment taking place. Select the first COP that you want to use as a point of reference from the Reference list.
Split-screen view showing a pointcloud to pointcloud alignment
Use your mouse to manipulate and orient each view as needed to create the Point Pairs.
Perform the alignment:
First, use the Point Pairs area to perform a rough alignment that brings the pointclouds close enough to each other. This is a mandatory step.
Click a desired
number of points (at least three pairs) on each of the pointclouds
within the overlap area. ONLY click points on the overlap area of
the two pointclouds. 
The more points you take around the overlap area of the pointclouds results in an improved alignment. Click Compute to create the rough alignment.
Next, use the Refine Alignment area whenever you want to refine
your alignment. This brings the two pointclouds closer to each other.
In order to get a good, refined alignment, the two pointcloud points
should be close enough to each other through the initial rough alignment.
Define the maximum distance between the points in the two pointclouds using the Maximum Distance box. The default value is 0 (zero). If you use the default value, PC-DMIS uses an internal default value related to the dimensions of the pointclouds.
Click Compute to refine the alignment.
If a portion of one pointcloud doesn't align nicely with the other, you can click the Undo button and recompute the alignment using the same type of alignment with additional parameters, or you can try a different alignment.
Once you're satisfied with the alignment, click Create. PC-DMIS closes the temporary split-screen view and places the COPCOPBF command in the Edit window. For details on the COPCOPBF command, see the "COPCOPBF Command Mode Text" topic in the PC-DMIS Laser documentation.
