With the dynamic UCS turned on, you can temporarily and automatically align the XY plane of the UCS with a planar face on a 3D solid, a planar mesh element, or a planar point cloud segment while creating an object.
During a command, you can align the UCS dynamically by moving your cursor over a planar face of a 3D solid or point cloud rather than using the UCS command. After you finish the command, the UCS returns to its previous location and orientation.
You align the UCS dynamically by moving your cursor over a planar face or point cloud segment rather than using the UCS command. After you finish the command, the UCS returns to its previous location and orientation.