Creating 3D Geometry - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 892

Select any point
along this line as
the second point
Base point
Select any point
along this line as
the third point
FiGuRE 16.75 Defining the source plane from the east elevation
Third point
Second point
Base point
FiGuRE 16.76 Defining the destination plane within the 3D model
12. Use the Extrude tool to extrude the two polylines that you just drew
43 ′ (13110 mm). Move the extruded roof 1 ′ 6 ″ (457 mm) along the
positive x-axis. When finished, your cabin should resemble the one
shown in Figure 16.78.