Oblique perspective
Oblique projection is commonly used to display object front faces in their true shape, while the parallel receding lines along the top, bottom, or sides are at a convenient angle to the horizontal (such as 45 degrees). Dimensions are often made along oblique objects to create technical reference drawings. To create or project artwork in oblique projection, click Oblique in the Perspective Document palette. The Foreshortened value controls the amount of surface viewed along the top or side faces. The Angle value controls the angle of the receding lines. Oblique projections are commonly made at 45 degrees with no foreshortening.