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origin and its X, Y, and Z axes to suit your needs. The UCS is useful in 2D
design and essential in 3D design because it controls features that include
â– The XY plane (or work plane)on which objects are created and modified
â– The horizontal and vertical orientation used for features like Ortho mode,
polar tracking, and object snap tracking
â– The alignment and angle of the grid, hatch patterns, text, and dimension
objects
â– The origin and orientation for coordinate entry and absolute reference
angles
â– For 3D operations, the orientation of work planes, projection planes, and
the Z axis (for vertical direction and axis of rotation)
Understand the World Coordinate System (WCS)
The WCS is a fixed Cartesian coordinate system. Internally, all objects are
defined by their WCS coordinates, and the WCS and the UCS are coincident
in a new drawing. However, it is usually more convenient to create and edit
objects based on the UCS, which can be customized to suit your needs.
Understand the UCS Icon
The UCS icon indicates the location and orientation of the current UCS. You
can manipulate the UCS icon using grips. For more information, see The UCS
Icon (page 25) and the UCSICON command.
NOTE If the location of the UCS origin is not visible in a viewport, the UCS icon
is displayed in the lower-left corner of the viewport instead.
Understand the UCS in 3D
When you create or modify objects in a 3D environment, you can move and
reorient the UCS anywhere in 3D space to simplify your work. The UCS is
useful for entering coordinates, creating 3D objects on 2D work planes, and
rotating objects in 3D.
NOTE The UCS icon follows the traditional right-hand rule in determining positive
axis directions and rotation directions.
Use Precision Tools | 149
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