To get a better idea of how Polygonal models work, it is good to understand the building blocks of a Polygonal object. As discussed before, Polygonal objects are constructed by arranging triangles of various sizes and orientations, called faces.
Each face is made up of three sides (or edges) and at the ends of each edge are points known as vertices.The construction of Polygonal models essentially involves the connecting of vertices.
If all of the faces of a model share an edge with at least three other faces, the model is said to be closed. If a model contains faces that do not share edges, the model can be considered open. Most Polygonal models you will deal with daily will be closed.
The only time that you will desire to have an open model is if you plan to fill the open area with another object. A good use of open Polygonal models is for Planar mapped surfaces such as:
Flat ground planes
Floors and ceilings
Backdrops Pictures or posters
Trees and bushes
Polygonal Modeling Uses
You can use polygons to model just about anything. As a matter of fact, there is not much you cannot model using polygons. With enough detail, you can create any surface.
However, some models lend themselves to being created by polygons more than others. For instance, models that tend to be more squared off can be most effectively modeled through polygons.
Architectural models come to mind most often. Due to the fact that many angles on objects — walls, windows, doors, and even most interior furniture — are right angles, Polygonal models work best.
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