TYPES OF PARALI NE DRAWI NGS
There are several types of para line drawings, each named after t he
method of projection that is used to develop them. Two of t hemost
common in architectural drawing are discussed inthis chapter:
isometric and oblique drawings.
In both isometric and obliquedrawings:
• All parallel lines in t he subject remain parallel in the drawing.
• All lines parallel to the principal X-Y-Z- axes can be measured and
drawn to scale.
The images that emerge from oblique pro
jections are distinct from
isometric views that develop fromorthographic projection. The e
ase
with which we can construct an oblique draw has a pow
ing
erful
appeal. If we orient a principal face of the subject parallel to the
picture plane, its shape remains trueand we candraw it more easily.
Thus, oblique views are especially convenient for representing an
object that has a curvilinear, irregular, or complicated face.
Isom Draw
etric
ings
• All three principal sets of planes share equal emphasis.
• The angle of view is slightly lower t hanthat of plan obliques.
• Plans and elevations cannot be used as basedrawings.
1/
Plan Obliques
E
levation O
bliques
• The principal set of horizontal planes orien ed parallel to the
t
picture plane is emphasized and can be represented intrue size,
shape, and proportion.
• Plan views can beu ilized as base draw
t
ings-a definite
advantage w drawing horizontal planes with circular or
hen
complex shapes.
• Plan obliques have ahigher angleof viewthan isometric drawings.
• The principal set of vertica l planes oriented pa rallel to the picture
plane is emphasized and can be represented in true size shape,
,
and proportion. Theother vertical set and the principal horizontal
set of planes are both foreshortened.
• An elevationcan be used as abase drawing. This view should be of
the longest, t hemost significant, or the most complex face of the
object or building.
PARALI~E DR AW I ~GS
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