Categories of Orthographic Projection
Orthographic projection is additionally divided into Multi-view projection and axonometric projection, depending upon where the direction of projection of rays is parallel to any principal axes or not. This produces the front, top and side views of a specified object, also referred to as multi-view drawing, if the direction of projection is parallel to any of the principal axes as in the figure.
Axonometric projections are orthographic projection wherein the direction of projection is not parallel to any 3-principle axes. Oblique projections are non- orthographic parallel projections that is, if the direction of projection d=(d1,d2,d3) is not perpendicular to the projection plane then the parallel projection is termed as an Oblique projection.