Copyright Goodheart-Willcox Co., Inc. 294 AutoCAD and Its Applications—Advanced PROFESSIONAL TIP PROFESSIONAL TIP If you are dragging a vertex and faces become triangulated, you can transparently change your viewpoint to see the effect of the triangulation. Press and hold the [Shift] key. At the same time, press and hold the mouse wheel button. Now, move the mouse to change the viewpoint. This is a transparent instance of the 3DORBIT command. Rotating Vertices As previously stated, a single vertex cannot be rotated or scaled, but two or more vertices can be. Since two vertices defi ne a line, or edge, any edit is an edge modifi ca- tion. However, the process is slightly different from the edge modifi cations described earlier in this chapter. To rotate an edge by selecting its endpoints, press the [Ctrl] key and select each vertex. See Figure 11-30A. You may need to use the [Ctrl]+[W] key combination to turn on selection cycling. Notice that grips appear at each selected vertex, but the edges between the vertices are not highlighted. The ROTATE command can now be used to rotate the vertices (if PICKFIRST is set to 1). However, a more effi cient method for rotating vertices is to use the 3DROTATE command. The combination of the rotate gizmo and the UCS icon enables you to graphically view the rotation plane. Once the command is initiated, select the vertices and move the base point A B C Face is triangulated Vertex to be moved Face is not triangulated Figure 11-29. Moving a vertex. A—The original object. B—Using the Move Vertex option moves the vertex and changes some of the adjacent faces. B—When using the Allow Triangulation option, adjacent faces are triangulated.