The Common toolbar provides several default views for your use. These predefined viewing angles provide the ability to look at the image from virtually any common viewpoint quickly and easily. Some of the views look at the model from an orthogonal viewpoint (Front, Back, Left, Right, Top and Bottom) and some present the view from a corner (Southwest, Southeast, Northwest and Northeast).
When a default view is selected, the current view is replaced using all of the settings of the default view. In other words, if you applied a Clipping Plane to the image (or any other Interactive View commands) prior to selecting a default view, its effects are no longer considered when the default view is applied.
Before the selected view is displayed, the display extents of the environment are calculated so that the entire environment is displayed in the View window. The display extents correlate to a box (parallel to the X, Y and Z axes) that encompass the entire image.
The default views use the perspective projection technique. Each of the default views is taken by locating the observer at a fixed point and focusing the eye at another fixed point, which correlates to the center of the model.