10 AutoCAD and Its Applications—Advanced Copyright Goodheart-Willcox Co., Inc. change the UCS to the WCS, type UCS to access the UCS command and then type W for the World option. When an isometric or other 3D view is displayed, you can easily switch to a plan view of the current UCS by typing the PLAN command and selecting the Current UCS option. The PLAN command is discussed in more detail in Chapter 3. NOTE NOTE Selecting an orthographic view of a model using one of the methods described previ- ously produces a plan view, but it may not achieve the results you desire. Three- dimensional models can be displayed in AutoCAD using either parallel or perspective projection. Displaying a plan view in either projection is possible. However, a true plan view, as used in 2D orthographic projections, can only be created when the model is displayed as a parallel projection. You can quickly change the display from perspective to parallel, or vice versa, by picking either Parallel or Perspective in the View Controls fl yout in the viewport controls. The current projection is checked in the fl yout. Exercise 1-2 www.g-wlearning.com/CAD/ Complete the exercise on the companion website. Introduction to the View Cube You are not limited to the preset isometric viewpoints. In fact, you can view a 3D object from an unlimited number of viewpoints. The view cube allows you to display all of the preset isometric and orthographic views without making menu or ribbon selections. It also provides quick access to additional pictorial views and easy dynamic manipulation of all orthographic views. It allows you to dynamically rotate the view of the objects to create a new viewpoint. The view cube is displayed by default in the upper-right corner of the drawing window. See Figure 1-13. It can be quickly turned on or off by selecting ViewCube from the Viewport Controls fl yout in the viewport controls. Refer to Figure 1-10A. The NAVVCUBE command controls the display of the view cube. NAVVCUBE Ribbon View Viewport Tools View Cube Type NAVVCUBE CUBE Pick to display the View Manager dialog box Orthographic preset views Isometric preset views Figure 1-12. Selecting preset views using the View panel in the Home tab of the ribbon.