3D Modeling - Learn OpenGL ES: For Mobile Game and Graphics Development - page 146

Figure 4-22 . Selecting vertices using lasso-select
5. The remaining vertices must be removed ( Figure 4-23 ). Press Ctrl I to
invert selection.
Figure 4-23 . Deleting vertices in Edit Mode
6. Press Delete to display the menu with delete operations, as shown in
Figure 4-23 . Click the option “Vertices,” to delete the highlighted ver-
tices.