foreshortened image

foreshortened image

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52) One begins with a square called the perfetto, the top edge of which serves as the bottom edge of the proposed foreshortened image (in [ILLUSTRATION FOR FIGURE 3 OMITTED], the perfetto is the square bcfg).
In this diagram the proposed foreshortened image is a trapezoid, bcfg, which extends up toward a theoretical principal point on the right that would become apparent if you took a ruler and extended lines cf and bg until they met at a point.