2004

Use Coordinates and Coordinate Systems | 233
You can use the UCSICON command to switch between the 2D UCS icon and
the 3D UCS icon. You can also use the command to change the size, color,
arrowhead type, and icon line width of the 3D UCS icon.
The UCS broken pencil icon replaces the 2D UCS
icon when the viewing
direction is in a plane parallel to the UCS XY plane. The broken pencil icon
indicates that the edge of the XY plane is almost perpendicular to your view-
ing direction. This icon warns you not to use your pointing device to specify
coordinates.
When you use the pointing device to locate a point, it’s normally placed on
the XY plane. If the UCS is rotated so that the Z axis lies in a plane parallel
to the viewing plane—that is, if the XY plane is edge-on to the viewer—it
may be difficult to visualize where the point will be located. In this case, the
point will be located on a plane parallel to your viewing plane that also
contains the UCS origin point. For example, if the viewing direction is along
the X axis, coordinates specified with a pointing device will be located on the
YZ plane, which contains the UCS origin point.
Use the 3D UCS icon to help you visualize which plane these coordinates will
be projected on; the 3D UCS icon does not use a broken pencil icon.
To turn the display of the UCS icon on and off
1 From the View menu, choose Display.
2 Choose UCS Icon. Then choose On.
The check mark indicates whether the icon is on or off.
Command line
UCSICON
To display the UCS icon at the UCS origin
1 From the View menu, choose Display.
2 Choose UCS Icon. Then choose Origin.
The UCS icon is displayed at the origin of the current coordinate system.
The check mark indicates whether the option is on or off.
Command line
UCSICON
broken
pencil
icon