Introduction to AutoCAD 2006 2D and 3D Design

When constructing outlines suitable as a base for the construction of some forms of 3D model, they can be drawn using either the Line tool or the Polyline tool. If constructed with the Line tool, before being of any use for 3D modelling, the outline must be changed to a region using the Region tool.
Call the Line tool from the Draw toolbar. Construct the outline as shown in the left-hand drawing of Fig. 13.4.
Fig. 13.4: First example Line outline and Region
Copy the outline to produce a second line outline (right-hand drawing of Fig. 13.4).
At the command line:
Command: enter pe (Edit Polyline) right-click
PEDIT Select polyline or [Multiple]: enter m (Multiple) right-click
Select objects: window the right-hand outline 12 found
Select objects: right-click
Convert lines and arcs to polylines [Yes/No]
Enter an option [prompts]: enter j (Join) right-click
12 segments added to polyline.
Command:
And the Line outline is changed to a polyline.
Left-click on the Region tool in the Draw toolbar (Fig. 13.5). The command line shows:
Command:_region
Select objects: window the left-hand drawing 12 found
Select objects: right-click
1 loop extracted
1 Region created
Command:
Fig. 13.5: The Region tool icon in the Draw toolbar
And the Line