Oblique projection
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In Oblique projection parallel projectors are imagined to emanate from every point of an imaginary object and which strike the projection plane at any angle different from ninety degrees - as opposed to orthographic projectors which always strike a plane of projection at ninety degrees. In Orthographic projection and Oblique Projection, parallel lines in space appear parallel on the projected image. Because of its simplicity Oblique Projection is used exclusively for Pictorial purposes.
OBLIQUE PICTORIAL
In an Oblique Pictorial drawing, the displayed angles among the axes as well as the foreshortening factors (scale) are arbitrary. The distortion created thereby is normally attenuated by aligning one plane of the imaged object parallel with the plane of projection thereby creating a true shape, full-size image of the chosen plane. A special case is to draw the receding axis scale at half-size and at an angle of 45-degrees. This called Cabinet Projection and is popular in furniture illustrations