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Unattainable Vanishing Points
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affinity axis angle of incidence arch auxiliary points Back Light base point basic rays breakthrough method breakthrough process cast shadow Cavalier Perspective component point constructed in Figure Counter Light drawing plane edge ellipse eyepoint freehand drawing freely drawn front elevation front of tt ground plan ground shadow guide triangle horizon H hyperbola illustration intersecting point Isometric L°2 lies left-hand main axis mirror Notes and Practice object obtain parabola parallelometry Pergola perpendicular to tt perspective division perspective image perspective line plan and front point and breakthrough point of intersection Practice Notes projection theory reflection right-hand roof pitch runs parallel second geometric location shadow constructed shadow falls shadow is cast shown shows the freehand side elevation solar angle solar nadir solid standpoint straight line sundial tower trace line trace point method trapezium true height unattainable vanishing point vanishing line vanishing point Fl vanishing trace vertical light plane wall Worm's-Eye View