SHADE & SHADOWS
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• The shadow of a straight line is t heintersection
of its shadow plane with the surface receiving the
shadow. The hypotenuse of the triangular shadow
plane establishes the direction of the light rays,
and its base describes their bearing.
146 I ARCHITECTURAL GRAPHICS
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~. The shadow of a stra ight lineon a flat surface
isthe linethat connects the shadows of its
end points. If the line intersects the surface,
' '.
its shadow must beg inat that juncture.
~ Ashadow line changes direction where it
crosses a corner, edge, or other break in the
continuity of a surface.
''-....._, Astraight line casts onto a parallel planea
shadow that is parallel to itself This isalso
true when the line is parallel t othe straight
lines in a curved surface receiving the shadow.