Prospective
view
Prospective view
drawing is an approximate representation or image as it is perceived by the eye
on a flat surface like paper.
Characteristics of prospective view
- Smaller as their distance from the observer increases
- Foreshortened: the size of an objects dimensions along the line of sight are relatively shorter than dimensions across the line of sight.
All prospective
drawings assume a viewer is a
certain distance away from the drawing. Objects are scaled relative to that
viewer.
An object is even not
scaled properly, a circle often appears to be ellipse and a square can appear
as a trapezoid. This distortion is referred to as foreshortening.
A
prospective representation of a scene that includes parallel lines has one or
more vanishing points in a
prospective drawing. Any number of vanishing points are possible in a drawing,
one for each set of parallel lines that are angled relative to the plane of
drawing.
Types
of prospective:
One
point prospective view
One vanishing
point is typically used for roads, railroad tracks or buildings viewed so that
the front is direct facing the viewer. Any objects that are made up of lines
either directly parallel with the viewer’s line of sight or directly
perpendicular can be represented with one point prospective view.
Two
point prospective view
Two point
prospective can be used to draw the same objects as one point prospective,
rotated: looking at the corner of a house, or looking at two forked roads
shrink into the distance.
Three
point prospective view
Three point
prospective is usually used for buildings seen from above (or below). In
addition to two vanishing points from before, one for each wall, there is now
one for how those walls recede onto the ground. This third vanishing point will
be below ground. Looking uo at a tall building is other common example.
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