Active shell
The active shell is the currently selected shell. Basic commands for shell such as select vertex, select face, and shell trackball are applied only to the active shell. Always only one shell is set up to the active shell. Setting up a shell to the active shell can be done by any of the following methods:
Click the left mouse on a shell in the project tree window.
Press the Tab key; each time the user presses the tab key, the active shell is changed in order as shown on the project tree.
Select Select >> Entities >> Shell on the menu; click the left mouse button on a shell in the workspace window.
The active shell is shown with reversed font on the project tree window. The bounding box of the active shell is drawn in white, while others are drawn in gray.