Self-Developing a MUVE for Research and Educational Innovations - Teaching through Multi-User Virtual Environments - page 463

The roof structure is created by moving this
edge up vertically (see Figure 14).
However, the roof lacks depth. By selecting
the two roof faces and extruding them, the roof
acquires depth. Figure 15 depicts the extruded
roof in red.

The next step is to add doors to the house.
Similar to creating the asphalt jungle, create a
door requires cutting edges into the front face of
the house that represent the door and the door
frame, then extruding the door frame (see Figure
16).

Figure 15. Extruding the roof faces to give them depth

Figure 16. The door and door frame created by cutting edges for the door and door frame and then
extruding the door frame faces