ars154 2 006 - Chapter 3 HOW WE SEE FOR PERSPECTIVE DRAWING...

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Unformatted text preview: Chapter 3: HOW WE SEE FOR PERSPECTIVE DRAWING Cone OfVision . . . Central Visual Ray. . . Picture Plane A perspective drawing will look correct only if the artist’s viewpoint and his direction of viewing the subject are relatively fixed. This means drawing with a limited “field of vision.” This field is usually called the CONE 0F VISION because of the infinite number of sight lines which radiate in a cone—like pattern from the eye. (In reality these lines are light rays coming from the subject to the eye.) The angle of this cone is between 45 and 60 degrees. If a greater angle is used in a drawing, it implies a moving cone of vision t and the picture will be distorted. You can test your cone of vision by looking straight ahead and swinging your outstretched arms in and out of sight. .wmflllli‘iflfli W'G—‘l / é»; . When we look about, essentially what we do is focus upon a succession of spots or “centers of interest,” each of which is fixed by a sight line at the exact center of the cane of vision. This line is sometimes called the ”center line of sight” or the “central direction of seeing.” We shall call it the CENTRAL VISUAL RAY. When you look through a telescope or hold a pencil so that it appears as a point the telescope or the pencil is exactly on your central visual ray. To understand perspective drawing 3 PICTURE PLANE must be imagined between the observer and subject. , THIS PLANE HAS A CONSTANT RIGHT ANGLE RELATIONSHIP WITH THE CENTRAL VISUAL RAY. So when drawing a subject, whether it is above, below or straight ahead. imagine viewing it through an omnipresent picture plane which is perpendicular to your central visual ray surrounded by a cone of vision. - -:1 ...
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