The PointCloudEx entity (or "point cloud extension entity") works with the AcDbPointCloudDefEx object (or "point cloud extension definition object") to manage point cloud data inside AutoCAD. The relationship between these two classes is much like the relationship between an AutoCAD block definition object and a block reference entity. 

The PointCloudEx entity is a drawable, selectable AutoCAD entity that places point cloud data in model or paper space at a particular location and orientation, and with a particular scale. It also contains crop boundaries, scan and region visibilities, stylization types, color mapping schemes, a limit box, and other typical AcDbEntity properties, like layer. 

The PointCloudEx entity cannot be used by itself. It must be linked to an AcDbPointCloudDefEx object by calling PointCloudEx::setPointCloudDefExId(). 

Furthermore, an AcDbPointCloudDefReactorEx must be constructed and linked to each PointCloudEx entity and AcDbPointCloudDefEx object.

Autodesk.AutoCAD.DatabaseServices.DBObject
    Autodesk.AutoCAD.DatabaseServices.Entity
        Autodesk.AutoCAD.DatabaseServices.PointCloudEx

Public Class PointCloudEx
Inherits Entity

public class PointCloudEx : Entity;