Creating Solids and Surfaces from 2D - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 97

16. Apply EXTRUDE to the last object created with height -0.1 .
17. Let's unfreeze the 3D-WALLS and 3D-BALCONY layers and freeze WALLS
and BALCONY .
18. To create the top slab, we could use the same process of contouring the
top of the walls, but another easy way is to copy the existing slab and
apply the SLICE command to cut the part corresponding to the balcony.
We will apply this last method. For now, select the slab and copy it 2.8
units along Z direction. In Chapter 7 , Editing Solids and Surfaces , we will
conclude this part.
19. By changing the visualization style to X-Ray and orbiting, verify the mod-
el's accuracy.