PERSPECTIVE VARIABLES
The observer's point of view determines the pictorial effect of a
perspective drawing. As this viewpoint changes-as t heobserver
moves up or down, to the left or right, forward or back-the
extent and emphasis of what the observer sees also changes. In
order to achieve the desired view in perspective, we should
understand how to adjust the following variables.
Height of the Stotion Point
The height of the station point (SP) relative to anobject
determines whether it is seen from above, below, or within its own
height.
• For a normal eye-level perspective, SP is at the standing height
of a person.
• As SP moves up or down, the horizon line (HL) moves up or down
with it.
• A horizontal plane at t he level of SP appears as a horizontal line.
• We see the tops of horizontal surfaces that arebelow the level of
SP and the undersides of horizontal planes that are above.
·~ • Even if not actually visible in aperspective view,
the horizon line should always be drawn lightly
across the drawing su rface to serve as alevel line
of reference for the entire composition.
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