Perspective drawing

Perspective drawings are used to illustrate the appearance of the object so that it is completely understandable to a third person. Actual measurements are not taken from such drawings, as they are only concerned with the mechanics of vision in which receding lines appear to converge and diminish. Various methods are used, many of which are highly technical and require special study, but 334 shows a simple compromise which should be sufficient for most practical purposes. Figure 334:2 shows the elevation of a simple chest of drawers, and in 334:1 the plan ABCD is drawn to scale at an angle to the horizon (eye-line) dependent on the viewpoint required (in this case 45°). The station point (SP) is placed to represent the eye of the beholder, and only trial and error can give the most satisfactory position. While the angle or cone of vision represented by lines drawn from the extremities DB of the plan ABCD to the station point (SP) should be between 40° and 60° for a normal aspect (the normal camera lens takes in about 55°), a narrower angle, even though it increases the distortion, helps to contain the vanishing points within the drawing, as a little experiment will show. Lines are now drawn to form a right angle at SP and cut the horizon at VPl and VP2, which are the vanishing points to which all receding lines converge. A base- or ground-line

Perspective Drawing Angle

334 Perspective projection

334 Perspective projection

True Height Line Perspective

335 Measuring point perspective

is drawn approximately 5 ft (150 cm) scale measurement below the eye-line or horizon, while a perpendicular dropped from A to H will provide a height-line on which all significant measurements can be transferred from the elevation (334:2). Lines are then drawn from all the salient points on the plan ABCD to the station point SP, and from where they cut the horizon verticals are then dropped as shown. If from the line AH (334:1) the various heights are connected to VPl and VP2 the completed drawing will then be automatically developed.

335 Measuring point perspective

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