Oblique drawings are simple 3D drawings used in drafting and engineering. They consist of an object drawn flat with angled sides for depth. They can be normal, movable, or cavalier and are created from a three-view drawing. The length of the depth lines determines the type of oblique drawing.
An oblique drawing is a simple form of three-dimensional (3D) drawing that is often created for drafting or engineering purposes. Such a drawing usually consists of an object where the front of the object is drawn flat, with the height and width of the object drawn at the appropriate lengths. The object is then given depth through the angled sides to create the sense of the three-dimensional object; this is often at a 45° angle and the sides can be shortened. An oblique drawing will typically be of three types: normal, movable, or cavalier.
To create an oblique drawing, an engineer or designer usually starts with a “three view drawing”. This consists of a single object rendered in three distinct views: from the front, side and top. The front design is usually created first to establish the height and width of the object. The vertical lines of the front view can then be extended upwards on the paper, adding to the depth of the object and this creates the top view. The horizontal lines from the front view can then be extended to the side of the front view, the correct depth is used again and thus the side view is created.
With a three-view drawing, a designer or engineer can then easily create an oblique drawing. This is done by using the height and width from the front view and keeping them the same size. The depth of the top and side views can then be used to add depth to the oblique drawing and create the sense of 3D in the image. While you can choose any angle to create depth lines, a 45° angle is often chosen due to the easily visible nature of lines at that angle.
The length of the lines used to add depth to the object determines the type of oblique drawing you are creating. Regular oblique drawings use depth lines that are only three-quarters the length of the depth established by the three-view drawing. Cabinet drawings use lines only half the length of the original depth lines to create the oblique object.
In either of these types, the object will appear foreshortened and appear closer to how it might actually appear in 3D space. An oblique cavalier drawing, on the other hand, uses depth lines of the same length as the top and side views in the three-view drawing. While this maintains the dimensions given in the three-view image, the perspective created by this type of oblique is much more exaggerated.
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