2004

216 | Chapter 15 Use Precision Tools
In the illustration below, the coordinate values of 3,2,5 indicates a point 3
units along the positive X axis, 2 units along the positive Y axis, and 5 units
along the positive Z axis.
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 coordinate in the X,Y,Z
format and then enter subsequent coordinates using the X,Y format with the
Z value remaining constant. For example, if you enter the following coordi-
nates 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 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, no prefix
is necessary.
+Z
+Y
+X
-X
-Y
-Z
3,2,5
WCS origin point