**Cube judgment system and how to quickly draw in three-point perspective**

#### Three-point perspective regards linear perspective in which parallel lines along the width of an object meet at two separate points on the horizon and vertical lines on the object meet at a point on the perpendicular bisector of the horizon line.

The simplest way to draw in three-point perspective is by employing the cube judgment system, a method way less laborious than the plan elevation. Follow the short four steps bellow:

Flip the diagram upside down and you can see an upward convergence of verticals toward a vertical vanishing point in the sky.

- draw a cube near the horizon line, where it is easier to judge the foreshortening of all three visible faces.
- using diagonals, extend the cube module system downward to draw the correct perspective of the cube on the ground.
- also diagonals, extend this system laterally.
- building design shapes are then measured from these cubes.

Converging Lines | Vertical lines converge at a vanishing point above or, in these cases, below the horizon. Horizontal lines converge to the usual horizon line vanishing points – planes are not parallel to the picture plane or the ground plane.

Some examples: