SHADE & SHADOWS
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In two-point perspective, the simplest method for casting
shadows is to assume that the bearing direction for the
light rays originates from either t heleft or right and is
parallel to the picture plane. You can then use 45° triangles
to determine the direction of the light rays and the
shadows cast by vertical elements in perspective.
The light rays, being parallel to the picture plane, remain
at a45° angle to th