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Defining user coordinate systems

When working in three-dimensional space, you can define a user coordinate system (UCS) with its own 0,0,0 origin and orientation separate from the World Coordinate System. 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.


UCS aligned with the front wall of the house.

Methods for defining a user coordinate system

Define a UCS by specifying a new origin and points on the positive x- and y-axes

Select a preset UCS

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