AutoCAD 2008 User's
Guide > Create and Modify
Objects > Use Precision
Tools > Use Coordinates and
Coordinate Systems (UCS) > Enter 3D
Coordinates >

Enter 3D Cartesian Coordinates

3D Cartesian coordinates specify a precise
location by using three coordinate values: *X*,
*Y*, and *Z*.

*(X,Y,Z*) is
similar to entering 2D coordinate values *(X,Y)*. In addition to specifying *X* and *Y* values, you also specify
a *Z* value using the following format:

*X,Y,Z*

NoteFor the
following examples, it is assumed that dynamic input is turned off
or that the coordinates are entered on the command line. With
Dynamic Input, you specify absolute coordinates with the *#* prefix.

*X* axis, 2
units along the positive *Y* axis, and 5 units
along the positive *Z* axis.

*X,Y*, the *Z* value is copied from the last point you entered. As a
result, you can enter one location in the *X,Y,Z* format and then enter subsequent locations using
the *X,Y* format with the *Z* value remaining constant. For example, if you enter
the following coordinates for a line

From point: *0,0,5*

To point: *3,4*

*Z* value of 5. When
you begin or open any drawing, the initial default value of
*Z* is greater than 0.

Use Absolute and Relative Coordinates

*1,0,0* to enter a point one unit in the
positive *X* direction from the previous point.
To enter absolute coordinates at the command prompt, no prefix is
necessary.

*Z* value
for all coordinates is 0. You can use ELEV to set a default height above
or below the *Z* = 0 plane for digitizing
without moving the UCS.