Autodesk ALIAS 2010 - Page 355

3 Choose Surfaces > Primitives > Cylinder . Double-click the icon to open
the cylinder options.
4 Set the Sweep to 180 and the Sections to 4 to create a half cylinder.
Set the Caps to 0 from the pull-down menu, to only create the side wall
of the cylinder.
Part 6: Power Button | 349