Copyright Goodheart-Willcox Co., Inc. 66 AutoCAD and Its Applications—Advanced View Object Wheel If you think of your model as a building, the tools in the View Object wheel are used to view the outside of the building. This wheel contains four navigation tools: Center, Zoom, Rewind, and Orbit. Refer to Figure 3-15B. Center The Center tool is used to set the center point for the current view. Many tools, such as Zoom and Orbit, are applied in relation to the center point. Pick and hold the Center tool, then move the cursor to a point on the model and release. The display immediately changes to center the model on that point. See Figure 3-18. The selected point must be on an object. Notice that the center point icon resembles a globe with three orbital axes. These axes relate to the three axes of the model shown on the UCS icon. Zoom The Zoom tool is used to dynamically zoom the view in and out, just as with the AutoCAD RTZOOM command. The tool uses the center point set with the Center tool. When you pick and hold the Zoom tool in the wheel, the center point is displayed at its current location. The cursor changes to a magnifying glass with the label Zoom Tool displayed below it. See Figure 3-19. There are three different ways to use the Zoom tool, as discussed in this section. When the Zoom tool is accessed in the Full Navigation wheel, the center point is relocated to the position of the steering wheel. If you wish to zoom on the existing center point when using the Full Navigation wheel, fi rst press the [Ctrl] key and then access the Zoom tool. This prevents the tool from relocating the center point. You can also move the center point using the Center tool, then switch to the View Object wheel and access the Zoom tool from that wheel. In either case, the zoom is relative to the location of the center point. Moving the center point Figure 3-18. The Center tool allows you to select a new center point for the current view. This becomes the point about which many steering wheel tools operate. Current center point Cursor Figure 3-19. The Zoom tool operates in relation to the center point. If the tool is selected from the Full Navigation wheel, the center point is automatically relocated to the cursor location.