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I. Definition of Orthographic Projection. Orthographic projection (or orthogonal projection) is a means of representing a three-dimensional object in two dimensions.he term orthographic is also sometimes reserved specifically for depictions of objects where the axis or plane of the object is also parallel with the projection plane, as in multiview orthographic projections.
First angle projection is a method of creating a 2D drawing of a 3D object. It is mainly used in Europe and Asia and has not been officially used in Australia for many years.In Australia, third angle projection is the preferred method of orthographic projection. Note the symbol for first angle orthographic projection.This is important information for the person interpreting the drawing because if you examine the diagram below you will note that in first angle orthographic projection: 1  the view from the front is in the middle. 2  the view from the left is on the right.ote the symbol for first angle orthographic projection. This is important information for the person interpreting the drawing because if you examine the diagram below you will note that in first angle orthographic projection: 1  the view from the front is in the middle. 2  the view from the left is on the right.