Figure 2-1.
Cube construction
4. Once the picture plane was established, the station point for the top
view in Figure 2-2 was located. The rule for locating this station point is
to position it approximately opposite the center of the block, at a distance
from the object so-the angle at the SP is no greater than 30 degrees. If
this rule is neglected, a distorted appearance may result in the perspective
drawing because there is a cone of about 30 degrees in which the human eye
sees clearly. For this reason, the angle formed by the lines of sight from
the sides of the object to the station point should not exceed 30. In no
case, even when the perspective drawing depicts a panoramic scene, should it
exceed 45.
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