Copyright Goodheart-Willcox Co., Inc. 68 AutoCAD and Its Applications—Advanced By default, thumbnail images of previous views outside of a steering wheel are not immediately displayed in the navigation history. The Steering Wheels Settings dialog box allows you to control when thumbnail images are generated in the navigation history. This dialog box is discussed later in the chapter. The navigation history is maintained in the drawing fi le and is different for each open drawing. However, it is not saved when a drawing is closed. Orbit The Orbit tool allows you to rotate your point of view completely around the model in any direction. The view pivots about the center point set with the Center tool. When using the Full Navigation wheel, the center point can be quickly set by pressing and holding the [Ctrl] key, then picking and holding the Orbit tool. Next, drag the center point to the desired pivot point on the model and release. Now you can use the Orbit tool. To use the Orbit tool, pick and hold on the tool in the steering wheel. The current center point is displayed with the label Pivot. Also, the cursor changes to a point surrounded by two circular arrows. See Figure 3-21. Move the cursor around the screen and the view of the model pivots about the center point. If this is not the result you wanted, just reset the pivot point using the Center tool. PROFESSIONAL TIP PROFESSIONAL TIP Since the Orbit tool is most often used to move your viewpoint quickly to another side of the model, it is more intuitive to locate the pivot point somewhere on the model. First, use the Center tool to establish the pivot point. Then, use the Orbit tool to rotate the view around the pivot point to the desired viewpoint. If the center point is not set, it defaults to the center of the screen. CAUTION CAUTION When the Zoom tool is selected from the Full Navigation wheel, the center point is changed to the steering wheel location. Therefore, that center point is used as the pivot point for the Orbit tool. When the Zoom tool is selected from the View Object wheel, the center point is not changed. Therefore, it is best to switch to the View Object wheel to use the Zoom tool or to press the [Ctrl] key before accessing the tool in the Full Navigation wheel. Tour Building Wheel Where the tools in the View Object wheel are used to view the outside of the “building,” the tools in the Tour Building wheel are used to move around inside of the “building.” This wheel contains four navigation tools. The Forward, Look, and Up/Down tools Figure 3-21. The Orbit tool allows you to rotate your point of view completely around the model in any direction. This is the cursor displayed for the tool.