SHADE & SHADOWS
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Avertical edge casts a shadowon the ground plane
in the sa me direction as t he bearing direction of
t helight ray. The shadow and the bearing direction
therefore share the same vanishingpoint.
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c : :rmine the shadow cast on a vertical
surface by a horizontal line located above
the ground plane. first project the linedown
to the ground plane. Determine where the
bearing of the shadow m thevertical
eets
surface. Then extend this point up until it
intersects the light ray.
154 / ARCHITECTURAL GRAPHICS
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A horizontal edge casts on t heground
plane, or on a parallel vertical surface, a
shadow that is parallel to it self. Both the
casting edgeand its shadow t herefore
share the sam vanishing point.
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