By Matt Fussell
Two point perspective drawing is a type of linear perspective. Linear perspective is a method using lines to create the illusion of space on a 2D surface. There are three types of linear perspective. One point perspective uses one vanishing point placed on the horizon line. Two point perspective uses two points placed on the horizon line. Three point perspective uses three vanishing points.
Linear perspective is one of the six ways to create the illusion of space on a two-dimensional surface. All forms of linear perspective involve the horizon line, vanishing point(s), and lines of perspective that recede or advance to the vanishing point(s). Each form of linear perspective is named for the number of vanishing points used in the drawing. Therefore, two point perspective uses two vanishing points.
Two point perspective starts by defining the horizon line. This line theoretically represents the line that divides the sky from the ground. However, with many perspective drawings, this line is implied and instead represents the eye-line or "line of sight" of the viewer.
Once the horizon line has been established, the vanishing points are placed. The vanishing point is defined as a point placed on the horizon line where objects begin to disappear because of distance. A good way to think of the vanishing point is by imagining yourself standing on a beach. Looking both directions, you can see endlessly down the beach. At some point, people on the beach walking away from you will become progressively smaller until they completely disappear at the horizon line.
With two point perspective, two vanishing points are placed on the horizon line. These two points should be spaced out from each other to prevent distortion. Both vanishing points need not both be within the picture plane, just as long as they are found on the horizon line, which continues on off of the picture plane in both directions.
The next step is to draw the corner of the object. Most commonly, two point perspective is used for drawing buildings or interiors, so this line could be the corner of a building. This line is drawn in between the two vanishing points and can cross over the horizon line.
Receding lines are next drawn from each end of the corner to each one of the vanishing points. These lines are called orthogonal lines. Any set of parallel lines that recede away from the viewer will follow along these lines to one of the vanishing points.
Parallel, vertical lines are drawn to indicate where the building or form ends. The closer that these lines are placed in space to the vanishing points on either side, the longer the form appears.
When a form is placed so that it overlaps the horizon, no additional lines are needed to define the overall form of the object. However, it is important to note that additional lines do exist. These lines are visible when the subject is placed above the horizon line or below it.
Orthogonals extend out from each end of the form and line up with the opposite vanishing point. The location of intersection that occurs defines the the back corner of the cube, which is drawn using a vertical line.
For forms placed below the horizon line the steps remain the same. However, the top of the form will be visible. This means that the top portion of the form will be defined by the orthogonal lines that extend from each end to the opposite vanishing point.
Here again, some of the lines are not visible in the finished drawing (red lines). It is important to note that the locations of where these lines intersect define the back corner of the cube.
For forms placed above the horizon line, the same steps are followed. In this case, the bottom portion of the form is now visible to the viewer. The bottom portion is defined by extending lines from each end of the cube to the opposite vanishing point.
As is the case with the other examples, additional lines (red lines) exist but are not visible in the finished drawing. When complete, all lines that are no longer needed can be erased revealing the illusion of 3D forms in space.
Additional details can be added to a scene to create limitless possibilities. Vertical lines are drawn to indicate edges and corners, while orthogonal lines are drawn for parallel edges that recede into space.
The type of linear perspective used by the artist depends largely on the vantage point of the viewer. If the view of most of the geometric shapes in the scene are "flat", then one point perspective may be the best choice. If the corners of objects are prevalent, then two point perspective may be the best solution. If the view is extreme, from above or below, then the best choice may be to use three point perspective.
Step One: Define the horizon line and the vanishing points.
Step Two: Draw the corner of the object in between the vanishing points.
Step Three: Draw lines from each end of the corner to each of the vanishing points.
Step Four: Draw parallel, vertical lines to indicate where the object ends.
Step Five: Erase the lines you no longer need to reveal your 3D form.
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