Orthographic Projections, Continued
In axonometric projections, the observer is located at infinity and the visual
rays are parallel to each other and perpendicular to the plane of projection.
A key feature of axonometric projections is that the object is inclined toward
the plane of projection showing all three surfaces in one view. Since the
principal edges and surfaces of the object are inclined toward the plane of
projection, the length of the lines, sizes of the angles, and proportions of the
object varies according to the amount of angle between the object and the
plane of projection. The greater the angle to the plane of projection, the
greater the amount of required foreshortening. The three edges that intersect
nearest the location of the observer are known as the axonometric axes (O).
Axonometric projections are further classified as isometric projections,
dimetric projections, and trimetric projections.
Figure 6-13 shows an axonometric projection.
Figure 6-13.An axonometric projection.
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