Oblique drawing is a also a drawing that is designed to create a 3D view of an object. However is easier to master oblique drawing than the other isometric and orthographic drawing.



Oblique projection is a type of parallel projection:



It projects an image by intersecting parallel rays (projectors)

from the three-dimensional source object with the drawing surface (projection plane).

In oblique projections, the projectors are parallel to each other but are not perpendicular to the plane of projection



Types of oblique projections :

(a) cavalier projection

(b) cabinet projection



A. Cavalier projection

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    -Direction of projection makes a 45 degrees angle with the projection plane



    -Is   a   form   of oblique  projection  in  which  the  projection  lines are presumed to make a       45-degree vertical and a 45-degree   horizontal   angle   with   the   plane   of projection.



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B. Cabinet Projection



Cabinet projections are oblique projections where the receding axes are drawn at any angle with the horizontal but usually drawn at 30° or 45°. The full scale of the receding axis distorts the projection and requires foreshortening to look more natural.  

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You may use any oblique ratio (two to three or three to four) but a one to two (one half) ratio is more common.

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When you reduce the scale by half, it is called a cabinet projection. The term  cabinet drawing comes from drawings in the furniture industry.

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Example of cabinet projection:

















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                    A cabinet projection view is the half-scale cut of the above diagram.





Strengths



1. Can be used by the marketing department of a business to illustrate product and their features.

 

Examples of oblique drawings: