Figure 3-5.

Mechanical tool and freehand layout methods

b. The back line of the new square is determined by the method

presented in Figure 3-5. Now diagonal lines are drawn from corner to corner

in the perspective square. Within the original square, short vertical lines

are drawn downward to the picture plane from the points where the circle

line and the diagonal lines intersect. From these two points, draw lines

back to the vanishing point.

The points at which these lines cross the

diagonal lines in the perspective square are the points through which the

curve is drawn.

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