About the Shell User Interface
The Shell tab consists of commands, tabs, and shortcut menus. Click > 
Shell to open the Shell tab.
Shell to open the Shell tab.Commands
• Thickness
◦ Thickness box—Sets the value for default shell thickness.
▪ 
—Flips the direction of the Shell feature.
—Flips the direction of the Shell feature.Tabs
• References
◦ Bodies to shell
▪ All—Shells geometry from all the bodies in the model.
▪ Selected—Shells geometry from the selected bodies. The default body is selected, unless you select a different body.
▪ Bodies collector—Selects the body from which geometry is removed.
◦ Remove surfaces—Displays the surfaces to remove. If you do not select any surfaces, a closed shell is created, with the inside of the body hollowed out and no opening to the inside.
◦ Non-default thickness—Displays surfaces to which to assign a different thickness. For each surface included in this collector, you can specify an individual thickness value.
• Options
◦ Exclude surfaces—Displays one or more surfaces to exclude from the shell. If you do not select any surface to exclude, the entire body is shelled.
▪ Details—Opens the Surface Sets dialog box to add or remove surfaces.
 | You cannot select quilt surfaces when you access the Surface Sets dialog box through the Shell user interface. |
◦ Surfaces extension
▪ Extend inner surfaces—Forms a cover over the inner surfaces of the shell feature.
▪ Extend excluded surfaces—Forms a cover over the excluded surfaces of the shell feature.
◦ Prevent shell from penetrating solid at
▪ Concave corners—Prevents the shell from cutting through the solid at concave corners.
▪ Convex corners—Prevents the shell from cutting through the solid at convex corners.
• Properties
◦ Name box—Sets a name for a feature.
◦ 
—Displays detailed component information in a browser.
—Displays detailed component information in a browser.Shortcut Menus
Right-click the graphics window to access shortcut menu commands.
• Remove Surfaces—Activates the Remove surfaces collector.
• Non Default Thickness—Activates the Non-default thickness collector.
• Exclude Surfaces—Activates the Exclude surfaces collector.
• Select bodies—Activates the body collector so you can select bodies.
• Clear—Clears the active collector.
• Flip—Flips the shell side.
Right-click the handle or value connected to the O_THICK label to access shortcut menu commands.
• Flip—Flips the shell side.
Right-click the handle or value connected to a THICK label to access shortcut menu commands.
• Remove—Removes the current surface from the Non-default thickness collector.
Right-click the Individual Surfaces label to access shortcut menu commands.
• Remove Set—Removes the selected surface or surfaces from the Exclude surfaces collector.
• Solid Surfaces—Constructs the surface set and adds all solid surfaces to the set.
Right-click the Seed and Boundary Surfaces label to access shortcut menu commands.
• Activate Set—Activates the selected set for adding or removing surfaces from the set.
• Remove Set—Removes the seed and boundary surface set from the Exclude surfaces collector.