Parallel projection of three-dimensional space on a plane in which at least one of the three axes of projection is not perpendicular to the two others.

Like axonometric projections, oblique projections make it possible to represent an object on a plane by suggesting the effect of depth. In an oblique projection, one face of the solid is represented in the main plane in full-scale following a parallel projection of the space in a plane, but the angle of the projection direction with the main projection plane is not right, hence the name oblique projection.

### Properties

Oblique projections preserve the parallelism of segments in a figure.

We mainly distinguish two types of oblique projections: