2012

Use Default Z Values
When you enter coordinates in the format 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
both endpoints of the line will have a 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
As with 2D coordinates, you can enter absolute coordinate values, which are
based on the origin, or you can enter relative coordinate values, which are
based on the last point entered. To enter relative coordinates, use the @ sign
as a prefix. For example, use @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.
Enter 3D Cartesian Coordinates
To enter absolute coordinates (3D)
 At a prompt for a point, enter coordinates in the tooltip using the following
format:
#x,y,z
If dynamic input is turned off, enter coordinates on the command line
using the following format:
x,y,z
To enter relative coordinates (3D)
 At a prompt for a point, enter coordinates using the following format:
@x,y,z
160 | Chapter 6 Create and Modify Objects