Once a 3d model has been created in Autocad, you may wish to view various cross-sections of the model. We demonstrate how in our Autocad 3D training courses.
A simple example of the section plane functionality would be a through a  simple box and cylinder as shown here. Create a box either using the Box tool in Autocad’s 3D interface, or draw the base with the standard 2D Rectangle tool, then use the Extrude tool to project the height upwards in the direction of the Z-axis. For example, 200 x 100 x 20mm. Next draw a diagonal construction line, as shown here. On the midpoint of the line create a Cylinder R30 and height 100.
It’s best to have these simple shapes joined as one unit. Therefore go to the Home tab and choose the Union tool from the Solid Editing tab, then select both items and hit the Enter key. Next go to the Top View and choose Ortho from the Status bar (or F8) to draw orthogonally.
Return to the Home tab and choose Section Plane. If using a version of Autocad pre-2009 go to Draw > Modeling and choose Section Plane. Now click to the right of the object, click above and below the object, thus creates the Section Plane. Click the Live Section panel at the right of the tab, and move the Plane with the Arrowhead. You can also flip this to the other side by clicking the smaller arrow. You can also select the Plane and right-click to “Generate a 2D section” or a “3D object”. Hit Enter three times to complete the command. Delete the Plane to return to the full object, or click off the Live Section tool.
The 3d interface in Autocad is user-friendly and easy to learn, and we take time to teach a broad range of applications in our classes including modeling, materials, lighting and animation. See many examples of our clients’ work on our Facebook page. For more information there are lots of resources on the web, but try the Autodesk site to begin with: www.autodesk.com. Support options and user forums are also available from the home page.
Other related Autocad 3d Blog Posts:

• Autocad 3d introduction
• Autocad 3d modeling
• Autocad 3d blocks
• Autocad 3d commands
• Autocad 3d basics