3.2 Extrude for polygon modeling

Having a geometrical primitive like a Cube or Cylinder in a scene could

be great for learning purposes, but you will probably want to modify their

shapes to build different objects. Regarding object transformation and

modeling, you will find that one option in Blender is among the most

used tools for polygon modeling.

The extrude is a tool that allows us to select and expand the shape of a

Mesh object. You can select either a vertex, edge, or face to start an

extrude. With the extrude, you get a copy of the selected elements

connected to the original selection. That is a simple way to describe how

it works.

It may sound confusing at first, but after using the extrude for a few

times, you will see how it can transform any 3D modeling pipeline. For

instance, if we select a face from a Cube and apply an extrude, you will

see the results shown in Figure 3.5.

Figure 3.5 - Extrude applied to face