Oblique Projections:

Oblique projections represent the second category of parallel projections. Oblique views are useful as they combine the advantageous qualities of multi view and axonometric both projections. As an axonometric view, this class presents an object's 3-D appearance. Alike to a multi view projection, oblique views display the exact shape of one face (Hill, in the year1990). As in an orthographic view, this class of projections utilize parallel projectors but the angle among the projectors and the view plane is no longer orthogonal. Figure illustrates an example of the direction of the projectors in relation to the view plane.

Figure: Direction of Projections for an Oblique Projection