Linear
Perspective
According to Willats, 2 types:
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Primary Geometry - (viewpoint, direction of projection)
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Secondary Geometry - (foreshortening, make parallels converge, project circles into elipses)
Pros:
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Simple and elegant solution to representing 3D on 2D image.
Cons:
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Limited to one viewpoint else distortion occurs (can be used to advantage see Holbein).
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Not all constraints between 3D and 2D satisfied - spheres projected as elipses, distortion in wide angle views.
