Autodesk AUTOCAD 2006, Command Reference Manual, Page: 1247 / 1490

3
2
1
The first point specifies the origin of the new UCS. The second point defines
the positive X axis. The third point defines the positive Y axis. The third point
can be anywhere on the positive Y portion of the new UCS XY plane.
Object
Defines a new coordinate system based on a selected 3D object. The new UCS
has the same extrusion direction (positive Z axis) as that of the selected object.
Select object to align UCS: Select an object
new UCS established select object
The following objects cannot be used with this option: 3D solids, 3D poly-lines,
3D meshes, viewports, mlines, regions, splines, ellipses, rays, xlines, leaders,
and multiline text.
For objects other than 3D faces, the XY plane of the new UCS is parallel to
the XY plane in effect when the object was drawn. However, the X and Y axes
can be rotated differently.
The new UCS is defined as shown in the following table.
Define a UCS by selecting an object
Method of determining UCS Object
The center of the arc becomes the new UCS origin. The X axis passes
through the arc endpoint that is closest to the selection point. Arc
The center of the circle becomes the new UCS origin. The X axis
passes through the selection point. Circle
The midpoint of the dimension text becomes the new UCS origin.
The direction of the new X axis is parallel to the X axis of the UCS in
effect when the dimension was drawn. Dimension
The endpoint nearest the selection point becomes the new UCS
origin. The new X axis is set so that the line lies in the XZ plane of Line
the new UCS. The line’s second endpoint has a Y coordinate of zero
in the new UCS.
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