Learning Event 2:
DEFINE ONE-POINT PERSPECTIVE
1. One-point perspective exists when two dimensions of an object (height
and width) are parallel to the picture plane. This occurs when the object
being observed is straight in front of the observer. In such a view there
is only one dimension, depth, that is left to be accounted for.
This
dimension must have a vanishing point.
Figure 1-2 shows how a one-point
perspective can occur in two ways.
If you look at cube straight on, the
vanishing point is out of sight behind it. If you were standing inside the
cube, as in a room, you would have the same situation that you have when you
are looking down the middle of a street. The right and left walls of the
enclosure correspond to the flat fronts of the buildings on the side of the
street.
In such a view all receding parallel lines appear to run to one
vanishing point.
Figure 1-2.
One-point perspective
2. To draw a cube in accurate perspective in relation to a definite view
point, a plan view is used as shown in Figure 1-3.
Application of this
method enables you to draw an object as it may appear at any distance and
viewpoint you desire. The sources of information necessary for this type of
drawing are scaled drawings of the top and side views of the object.
In
regard to drawing a cube, all sides are of equal length and a side view is
not necessary.
If a box of unequal sides were used, you would need an
elevation view of the box to find its height. This is covered later in the
chapter.
3. In Figure 1-3 one-point perspective is used since two dimensions (height
and width) are parallel to the picture plane.
Draw a square representing
the top of the cube in orthographic projection, and establish a station
point at a distance no less than three times the length of one
3
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