Perspective is related to the appearance of things – how the image you plan to paint looks and how you represent it in two dimensions on your paper (or canvas). As artists, we are concerned with achieving a sense of space, depth, and the appearance of three dimensions. We know objects and scenes change appearance from different viewpoints and under different lighting conditions. The use of perspective to suggest space and distance is just one of the useful tools an artist can use. By using principles of perspective, we can make our work more dynamic and effective.
DIMINUTION OR REDUCTION:
The first basic perspective rule is that all objects appear to decrease in size as they recede into the distance. So, the further away an object is from the viewer, the smaller it looks. This is called DIMINUTION.
Another perspective principle describes what happens as an object is revolved and seen from different angles. A coin, for example, when observed head on will appear round and maximum size, but as it is pivoted, the image we see begins to flatten and look more elliptical, until when viewed from the side, the coin looks very like a thin line. The object has become FORESHORTENED.
CONVERGENCE happens when lines or edges of objects (which we know to be PARALLEL) appear to come together as they recede into the distance. Looking down a fence line, for instance, a person would see the top and bottom of the fence converging, and the space between and the thickness of the fenceposts becoming narrower into the distance.
When talking about perspective, we must understand that parallel lines (such as railroad tracks) will seem to come together (converge) or meet at some point. This point on the distant horizon is called the VANISHING POINT. When looking at a fence or railroad tracks we see ONE vanishing point. The converging lines will meet at an observer’s eye level on the horizon, I.e. at the vanishing point. In real life the horizon line is not always visible (it may be located behind a mountain or building). Nevertheless, the horizon line will always be at the observer’s eye level. Therefore, EYE LEVEL can be used as the horizon line for horizontal lines in a drawing.
While the vanishing point will generally be at eye level on the horizon, an observer’s VIEWPOINT can change. A person can be looking up, down, or straight out. Thus, eye level/horizon line can be higher or lower in your picture, depending on viewpoint. When you look UP, you see more sky or ceiling and the eye level/horizon line will be LOW. On the other hand, when you look DOWN, you see more ground or floor and eye level/horizon line will become HIGHER.
So, when you draw or paint a picture, your eye level/horizon line will inform your viewer whether they are looking up, down, or straight ahead at a scene. For instance, it you place the horizon line high, they MUST be looking down on your subject. Place the horizon line low, and you are telling your viewer they are invariably looking up at the subject.
MULTIPLE VANISHING POINTS:
With a solid rectangular object, such as a building, you will have TWO vanishing points to consider. Each visible side of the building (made of parallel lines) has its own vanishing point. If you extend the lines forming the tops and bottoms of the visible sides until they meet, and you have drawn accurately, the lines will converge at two vanishing points on the eye level/horizon line. The two vanishing points need not be located on your paper. Often, depending on your viewpoint, the vanishing points will be off your paper, or possibly one (of the two) vanishing points will extend off the paper.
It is possible to have THREE OR MORE vanishing points. This can happen with a complicated drawing. When there are many SETS OF PARALLEL LINES going in different directions, each set will converge toward its OWN vanishing point.
Begin your consideration of perspective drawings by putting in the EYE LEVEL LINE. From there, you can begin to plot perspective lines (which represent SETS OF PARALLEL LINES) that should CONVERGE toward one or several VANISHING POINTS. When there are many sets of parallel lines going in different directions, each will converge toward its OWN vanishing point.
For more in depth information on perspective, consider:
Perspective:Learn How To Create Depth and Realism, 2001, by Ray Campbell Smith.
Perspective Drawing Handbook, 1964, by Joseph D’Amelio.
Basic Perspective Drawing: A Visual Approach, 1993, by John Montague.
Perspective For Artists, 1990, by Angela Gair.
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