Introducing 3D modeling - Introduction to AutoCAD 2011: 2D and 3D Design - page 230

Example - Outlines & Region ( Fig. 12.10 )

1. Construct the left-hand drawing of Fig. 12.10 using the Line and
Circle tools.

60

60

R25

1. 3 regions 3. Union of 2 unions

2. Union of 3 regions 4. Subtract region from Union

Fig. 12.10 Example - Line and circle outlines and Region

2. Enter region or reg at the command line. The command line shows:

Command:_region
Select objects: window the left-hand rectangle
1 found
Select objects: right-click
1 loop extracted.
1 Region created.
Command:
And the Line outline is changed to a region. Repeat for the circle and the
right-hand rectangle. Three regions will be formed.

3. Drawing 2 - call the Union tool from the Home/Edit panel ( Fig. 12.11 ).
The command line shows:

Command: _union
Select objects: pick the left-hand region 1 found
Select objects: pick the circular region 1 found,
2 total
Select objects: pick the right-hand region 1 found,
3 total
Select objects: right-click
Command: