Sketching  
 

Types: Perspective Sketch

The perspective sketch adds realism to the three-dimensional pictorial representation, since it represents the way the human eye inputs visual data. The key element in the perspective sketch is that parallel edge lines converge to a single point (called the vanishing point) along the horizon. If there is just one vanishing point, then it is called a 1-Pt. Perspective. If two sets of parallel edge lines converge to their respective vanishing points, then it is called a 2-Pt. Perspective. There is also the case of a 3-Pt. Perspective in which all vertical lines also converge to a point.

Figure 1. The perspective sketch adds realism to the three-dimensional pictorial representation, since it represents the way the human eye inputs visual data by converging all light rays to the retina.

 

Figure 2. A 1-Pt. Perspective Sketch of a Foot Bridge Design.

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