2004

294 | Chapter 16 Draw Geometric Objects
3 Press ENTER.
A message on the command line indicates how many loops were detected
and how many regions were created.
Command line
REGION
To define regions by using boundaries
1 From the Draw menu, choose Boundary.
2 In the Boundary Creation dialog box, in Object Type, select Region.
3 Choose Pick Points.
4 Specify a point in your drawing inside each closed area that you want to
define as a region and press ENTER.
This point is known as the internal point.
Note You can make a new boundary set to limit the objects used to determine
the boundary.
Command line BOUNDARY
To combine regions by adding
1 From the Modify menu, choose Solids Editing ➤ Union.
2 Select one region for the union.
3 Select another region.
You can select regions to unite in any order.
4 Continue selecting regions or press
ENTER to end the command.
AutoCAD converts the selected regions to a new combined region.
Command line
UNION
To combine regions by subtracting
1 From the Modify menu, choose Solids Editing ➤ Subtract.
2 Select one or more regions from which to subtract and press
ENTER.
3 Select the region to subtract and press
ENTER.
The areas of the second regions you selected are subtracted from the areas
of the first regions.
Command line
SUBTRACT