on 14 October 2013 Modified on Monday, 14 October 2013

Oblique Projection
Oblique projections and drawings are used when a designer wishes to clearly depict a part's irregular face. The face is placed parallel to the picture plane with the depth lines obliquely projected from the part at either 30°, 45° or 60°. Although any angle can be used, these angles are generally recommended as they are the common angles available on Set Squares. Of the three angles, 45° is the most commonly used.

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Oblique drawing is believed to be the early versions of perspective drawing. They have been found on Greek vase decorations from the fourth century BC and on Chinese paintings up until the eighteenth century AD.

Cavalier Drawing
Cavalier drawings are projected in full scale despite this causing the drawing to be unnaturally elongated and make the depth lines appear to diverge.

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Cabinet Projection
Cabinet projections avoid the problems associated with cavalier projections by scaling the depth lines by a ratio of 1:2.

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