Viewpoints

If you ever get the curiosity for dimensions read Flatland and the son's sequel SphereLand, however by warned they are totally politically incorrect, I am recommending them only as they have the best explanation for dimensionality I have ever read.

Back to the topic of viewpoints which are called projections. Firstly you will notice how dimensions are played against each other. Its easy to understand how to calc views as they can be reduced to finding intersection points of lines and the screen plane(3D case).

Firstly all 3D objects are represented as triangles, so if you saw a car in 3D upon magnification you would see that the car surface was composed of thousands of tiny triangles.

Perspective Projection

Seeing the world from a single eye or point source.

Orthographic Projection