Introduction to Polygon Modeling - MAXON CINEMA 4D R16 Studio: A Tutorial Approach - page 122

Figure 3-44 The polygons selected
6. In the Perspective viewport, right-click on the selected polygons of Computer mouse ; a
shortcut menu is displayed. Choose Extrude from the shortcut menu; the Extrude tool
settings are displayed in the Attribute Manager. Choose the Options button; the Options
area is displayed. Specify the value -1 in the Offset spinner and then press ENTER; the
selected polygons of Computer mouse are extruded, as shown in Figure 3-45.
Figure 3-45 The extruded polygons
of Computer mouse
7. Right-click on the Perspective viewport; a shortcut menu is displayed. Choose Knife
from the shortcut menu; the Knife tool settings are displayed in the Attribute Manager.
In the Options area, make sure that Loop is selected in the Mode drop-down list.
8. Using the Knife tool, create an edge, refer to Figure 3-46.
9. Add two more edges, refer to Figure 3-47 and 3-48. Figure 3-49 shows the edges.