. Perspective for art students . 5. The vertical at an angle. 6. The directly ascending or descending. 7. The obliquely ascending or descending. We see by Fig. 64 that the vanishing lines of theseare removed from the To find the of Various Planes 99 find the ; of Horizontal Planes. Merely to maintain a systematic method which isvaluable, we give a separate paragraph to this subject. Mark any point on the paper, and draw a lineacross the paper through it, using the T square. 33. To find the of Vertical Planes,Perpendicular to the Picture. These also have been suffic
. Perspective for art students . 5. The vertical at an angle. 6. The directly ascending or descending. 7. The obliquely ascending or descending. We see by Fig. 64 that the vanishing lines of theseare removed from the To find the of Various Planes 99 find the ; of Horizontal Planes. Merely to maintain a systematic method which isvaluable, we give a separate paragraph to this subject. Mark any point on the paper, and draw a lineacross the paper through it, using the T square. 33. To find the of Vertical Planes,Perpendicular to the Picture. These also have been sufficiently treated. The ruleisâ BroM through a line down the paper at rightangles to the horizon if that he previously found. 34. To find the of Inclined Planes,Perpendicular to the Picture. These planes are usually described as at such and suchan angle to the ground. When that is the case, the 100 Perspective inclination is of course to the horizontal, and the angleis set up through the 0. V. upon the horizon. HoRz^iS. Fig. 65,âVaDishing line of inclined planes making 25° with the grotind,and being perpendicular to the picture. Br aw through the a line at the same angle to thehorizon as the plane is declared to make with tlie horizontalor growid-plane. 35. Planes Parallel to the Picture. These have no vanishing points or lines, and the linesupon them are drawn without diminution. Of coursethe lines which are perpendicular to these planes recede To find the of Vertical Planes loi and Tanish. Hence some lines in Fig. 66 vanish. Thearches are, however, done with rule and compass. -=**»^ _^fi^ =^«^ ^ ^^ ? S ^ s ^^^ 1 -1â \ h-- ^ ^ ^ ^^^ K--^ -\ i^ y 4^^ ^ ^-^ ^ _L ^ ds^Sff^^^ 1 s *-:^:^ 1., ^^1 \ â¢^-i^--^ ^ 1 1 Fig. 66.âPlanes parallel to the picture. 36. To find the of Vertical Planes inclinedto the Picture. To obtain the vanishing lines of this and the twofollowing planes, we have to master one of the difficultieswhich trouble the beginner. W
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