72 THE ELEMENTS OF PEESPECTIYE. in Fig. 39., the rectangle is parallel to the picture plane, the line A b must he so also. If, as in Fig. 40., the rectangle is inclined to the picture plane, the line A b will he so also. So that, to fix the position of A b, the line A c must be given in position… … Fig. 39. Fig. 40. If these are given, and it is only required to draw the single line A b in perspective, the construction is entirely simple ; thus : — Draw the line A c by Problem I. Let A c. Fig. 41., be the line so drawn. From a and c raise the vertical lines a d, c b. Make a d equal to the…
Perspective
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