Protecting Characteristic Lines

You can protect characteristic lines from filtering and removal within a standard process.

This process can be:

Import of a cloud of points
Import or creation of characteristic lines (e.g. scans)
Union of the cloud of points and the scans
Filtering of the union cloud. At this stage, it is interesting to keep the characteristic lines untouched, because they are more pertinent than other points of the cloud, and because they will produce sharp edges of a better quality at the mesh creation step.
Meshing of the union cloud.

Right-click the cloud of points or mesh and select Properties.
The cells found in the cloud of point or mesh are listed below the viewer.
Select the Protected check box for the cell to protect.

When you start Remove or Filter , the protected cells or scans are shown as low-intensity elements (meaning they cannot be filtered nor removed) and are not taken into account.