This chapter acquaints you with the various types of parallel projections.
There are vast differences between oblique and orthographic projections.
Oblique projections, particularly isometric projections are the most widely
recognized because of their unique angular relationship to the plane of
projection. Orthographic projections are most closely associated with
blueprints or working drawings used for all types of construction. The
chapter terminates with standard practices for rendering objects in parallel
The theory and study of parallel projections develop your ability to think or
visualize in three dimensions. Parallel projections are methodical, logical,
mathematically correct representations of real objects or what could become
real objects. Understanding parallel projections increases your ability to
understand the mechanical interrelationship between parts from a wheel
bearing on your automobile to the component parts of a Rubiks cube.
A suggestion for increasing your understanding of perspective and parallel
projections is to look at the projection chart in the beginning of this chapter
to get an overall feel for the subject. Select only one block (type of
projection) and study it until you understand it. Then, return to an overall
study of projections to fully grasp the relationship between the different types