Complete perspective course : comprising the elementary and advanced stages of perspective, the projection of shadows and reflections, with exercises in theory and practice, also the practical application of perspective (1900)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan and co. · leaf 172
given line, and its intersection withthe picture plane is the vanishing point required [13]. 69. Directing Plane.—When receding lines are parallelto the ground plane, we set off the angle of their vanishingparallel [13], at the station point, witli the directing line [31];but when they are inclined… … directinfj plane, and is always at right angles to the directionof sight. Fig. 113 is a perspective sketch showing the position of thedirecting plane. SV is thegeneratrix of a cone [52],i.e. the vanishing parallel[13] for the required line. Let us assume that theline SV (Fig. 113) is con-tained by…
Perspective
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