The Projection Plane Settings dialog allows the user to define the orientation and the location of the plane that the digitized points would be projected onto using the Project To Plane filter.
Projection Plane
The desired plane can be selected from four
choices 
the XY plane, the YZ
plane, the XZ
plane, and the user-defined plane. The first three planes are orthogonal
to each other and correspond to the world X, Y, and Z axes according to
the FaroArm. The user-defined plane is stored from session to session,
and can be modified using the Define Plane
dialog.
Distance from plane to origin
This is the shortest distance from the world origin of the FaroArm to the desired plane. The position of the plane in space is determined by this value. The user can also define the location of the plane by clicking the button that brings up the Define Plane Location dialog, which allows the position of the plane in space to be digitized by the FaroArm.