Chapter 6 - Three-dimensional illustrations using isometric and oblique projection

Abstract

This chapter presents three-dimensional illustrations that use isometric and oblique projection. Isometric projection is commonly used in pictorial presentations, such as car and motor-cycle service manuals and model kits, where an assembly has been expanded to indicate the correct order and position of the component parts. In the vast majority of applications where complete but small circles are used, a small inaccuracy occurs along the major axis of the ellipse, which is of little importance and can be neglected. Oblique projection is an alternative pictorial projection in which the thickness of the object is reduced to one half of the actual size. With oblique and isometric projections, no allowance is made for perspective, and this tends to give a slightly unrealistic result, since parallel lines moving back from the plane of the paper do not converge.