It is a lot more involved than isometric or oblique, because viewing planes and vanishing points have to be established. These influence the whole appearance of the view and need to be chosen carefully. It is not usually considered economically viable to spend time producing views which are only intended to assist in the visualisation of a component. To produce a pictorial view of an assembly involves a formidable amount of work not considered necessary. It is expected that engineers can read and use orthographic drawings and sketches.
Pictorial illustrations are more useful in service manuals etc.
However, it is sometimes useful to be able to show non-engineers a 3D illustration of a component or assembly, but it is likely that the graphics will have been produced by a CAD trained operator who has received the information from an Engineer, in the form of orthographic drawings or sketches. It is essential that Engineers can think in three dimensions and it is vital for them to be able to communicate using orthographic projection. Whilst every care has been taken to ensure the accuracy and completeness of this information, neither the author nor the University of Southampton will accept responsibility for loss, damage etc. however arising occasioned by the use of this information.