One commonly heard complaint and reason for costumers to not use ReCap for the registration from the 3D laser scans is the fact that it's not possible to register a group of already registered point clouds to the other group of point clouds.
Now you need to register each individual scans, but imagen you have scanned a house from the interior and made a point cloud group for them. And you then scanned the interior of the house and registered them as a point cloud group. You would like to load both point clouds and register them as groups and not as individual scans.
Hope above description is clear.
With kind regards,
Kelly Pelzer