Three-dimensional drawing are commonly used for professional presentations. Whether it is a perspective, isometric or plan oblique, it is produced with accuracy. It is a communication method that anyone can use. It can express a design idea better than words. Oblique and axonometric drawings are fast and easy ways of producing realistic 3 – D views. Oblique drawing is the crudest '3D' drawing method but the easiest to master. Oblique is not really a '3D' system but a 2 dimensional view of an object with 'forced depth'. They are often referred to as Paraline Drawings because edges along each axis are drawn parallel to each other. In both oblique projection and orthographic projection, parallel lines of the source object produce parallel lines in the projected image. The projectors in oblique projection intersect the projection plane at an oblique angle to produce the projected image, as opposed to the perpendicular angle used in orthographic projection. The method of construction of these drawings is based on the relationship of three principal axes; x, y & z. Even though there are several types of paraline drawings all share.
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