The method of projection vary with the direction in which the rays of sight are taken to the plsnr. When the projection rays are perpendicular to the plane, the projective method is called' orthographic'. If the rays are right angles to the plane, the projective method is called 'oblique'.
Furthermore. If the rays are take. To a particular station point, the projective method will result in perspective, thereby presenting the object as would appear to the eye. Projective theory plays an important role in shapes of objects, as it is the basics for background information. In technical drawing , there are two basic methods by which shapes of objects are presented.
1. Orthographic views and
2. Pictorial views
