Linear system is a graphic representation system based on the projection of a three-dimensional body on a plane. Projecting lines pass through a point. The result is close to the vision obtained if the eye were located at that point.
Types of linear system:
ONE POINT PERSPECTIVE
The picture plane is parallel to a side of the object. Most of edges are parallel or perpendicular to the Picture Plane. There is only vanishing point in the horizon line.
TWO- POINT PERSPECTIVE
The picture plane is oblique in relation to the object. Most of edges are oblique to the Picture Plane. There are two vanishing point in the horizon line.
THREE- POINT PERSPECTIVE
The picture plane is oblique in relation to the object. All edges, included heights, are oblique to the Picture Plane. There are three vanishing point in the horizon line.
Here you can see some works of our 3rd ESO students using one point perspective