## Mcauaino Line No

VANISHING POINT POP*

LINE;

Chapter 12: INCLINED PLANES-INTRODUCTION

Since the bottom of this box is horizontal, its converging lines always vanish to eye level. An observer pointing in the direction of the box (horizontally) therefore points to its "vanishing line" (first drawing).

So it is with the pivoting box top. An observer pointing in the same direction as this variously-inclined plane points to its successive vanishing lines.

Box and box top are parallel, therefore only one vanishing line (eye level).

Here, the box top "points" somewhat below eye level, therefore it converges to a point slightly below eye level.

(NOTE THAT THE VANISHING POINTS FOR BOX AND BOX TOP ARE ALWAYS ON THIS VERTICAL CENTER LINE. THIS IS TRUE REGARDLESS OF THE TOP'S INCLINATION.)

EVIc LEVEL

Here, the box top again points below eye level, but because it is nearly vertical, its vanishing point is far away.

Here, the box top, like the box front, is parallel to the observer's face (picture plane), therefore it does not converge. (Vanishing points are at infinity.)

Here, the box top points Tar above eye level to its distant vanishing point.

Here, the box top's vanishing point is still above eye level, but closer, eye lbvel

Finally, the box and box top are again parallel, therefore they point to and use same vanishing point.

[78] Vertical Vanishing Line And Horizon Line Are Based On Same Theory And Serve Similar Purposes horizon line - eye level

First let's review: The top and bottom edges of each page of the books at right lie on horizontal planes (see side view). Therefore, they must all converge to the horizon line (eye level), which we recall is always on a horizontal plane through the observer's eyes — i.e., parallel to the planes in question. (See pages 28 and 29 for further review.)

horizon line - eye level

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SIDE. VIEW^p

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