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.
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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: