There are a couple of different ways to clean the point cloud. You can delete points from the visual cloud, and or, delete points from the cloud used for Cloud-to-Cloud registration.
Upon import two clouds are created for all setups. One is the visual cloud and one is the cloud only used for Cloud-to-Cloud registration. The cloud seen in Visual Alignment is the view of the Cloud-to-Cloud cloud.
You can edit the cloud directly in Visual Alignment, in which case you would only be editing the Cloud-to-Cloud cloud or you can edit the cloud outside of Visual Alignment, in which case you have a choice to delete the visual cloud and or the Cloud-to-Cloud cloud.
The use case for only deleting the Cloud-to-Cloud cloud is the case where you have trees that normally would cause a poor Cloud-to-Cloud fit. You want to keep the trees in the scene, but do not want the trees to cause a poor Cloud-to-Cloud fit, so you now have the option of only deleting the cloud-to-cloud cloud.
You can have the option to clean in the following areas:
Additionally, users can utilize filters to clean a project.