2012

Table Of Contents
Use the OBJECTISOLATIONMODE system variable to control whether objects
remain hidden between drawing sessions.
Use Precision Tools
You can use a variety of precision drawing tools to help you produce accurate
drawings quickly and without performing tedious calculations.
Work with the User Coordinate System
(UCS)
The UCS is the active coordinate system that establishes the XY plane (work
plane) and Z-axis direction for drawing and modeling.
Overview of the User Coordinate System (UCS)
The UCS is the active coordinate system that establishes the XY plane (work
plane) and Z-axis direction for drawing and modeling. You can set the UCS
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
The XY plane (or work plane)on which objects are created and modified
The horizontal and vertical orientation used for features like Ortho mode,
polar tracking, and object snap tracking
The alignment and angle of the grid, hatch patterns, text, and dimension
objects
The origin and orientation for coordinate entry and absolute reference
angles
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.
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