Showcase supports the 3Dconnexion SpaceNavigator 3D mouse. When one is installed on your system and recognized by Showcase, a corresponding icon is displayed in the Navigation Bar (but has no function). Only the SpaceNavigator 3D mouse "Object Mode" is supported by Showcase.
To see SpaceNavigator 3D mouse properties, click the right mouse button.
To fit to view, click the left mouse button.