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Defining user coordinate systems


A user coordinate system (UCS) is a Cartesian coordinate system with origins and

orientation defined by the user.


Understanding user coordinate systems

When working in three-dimensional space, you can define a UCS with its own 0,0,0

origin and orientation separate from the WCS. You can create as many user coordinate

systems as you want, and then save and recall them as you need them to simplify

construction of three-dimensional entities.


For example, you can create a separate UCS for each side of a building. Then, by

switching to the UCS for the east side of the building, you can draw the windows on

that side by specifying only their x- and y-coordinates. When you create one or more

user coordinate systems, the coordinate entry is based on the current UCS.


Defining a user coordinate system

To define a UCS, you can use any of the following methods:


• Specify a new origin and points on the positive x- and y-axes.

• Specify a new origin and point on the positive z-axis.

• Align the UCS with an existing entity.

• Rotate the current UCS around any of its axes.

• Align the UCS with its z-axis parallel to the current viewing direction.

• Align the UCS xy plane perpendicular to the current view.


When you define a new UCS, the UCS icon changes to indicate the origin and orientation

of the new UCS.


Using a preset user coordinate system 2019 lets you select a preset UCS. The six planes defined by looking along the x,y,z-axes align the UCS with the top, left, front, bottom, right, or back, based on either the WCS or the current UCS in effect when you select the tool. You can also select the previous UCS, align the UCS to the current view, or select the WCS.


When you select a UCS, the cursor orientation and UCS icon change to reflect the new UCS. The display does not change, however, unless you select the Change View To Plan View Of The Selected UCS check box


After you align the UCS to a preset UCS, you can use the 2019 Explorer to save the UCS. To do this, in the 2019 Explorer window, choose Edit > New > UCS, and then select Current.


Preset UCSs are also available with a dialog box.

Choose Format > User Coordinate Systems, then select a predefined UCS from the list. The preset UCSs are also available directly on the UCS toolbar.

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