Introducing 3D modeling - Introduction to AutoCAD 2011: 2D and 3D Design - page 229

Specify start point or [Object/Height/Width/
Justify] <Object>: pick the polygon
Select object: right-click
Command:

And the Polysolid forms.

5. Select Conceptual from the Layers & View panel ( Fig. 12.8 ).

The result is shown in Fig. 12.9 .

Fig. 12.9 The Polysolid

tool example

Fig. 12.8 Selecting Conceptual shading from Visual Styles in the Layers & View panel

2D outlines suitable for 3D models

When constructing 2D outlines suitable as a basis for constructing some
forms of 3D model, select a tool from the Home/Draw panel, or enter tool
names or abbreviations for the tools at the command line. If constructed
using tools such as Line , Circle and Ellipse , before being of any use for
3D modeling, outlines must be changed into regions with the Region tool.
Closed polylines can be used without the need to use the Region tool.