Subject: 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.

 

UCS aligned with the front wall of the house.

Understanding_user_coordinate_systems
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