Selected Bibliography Architectural Graphics | Page 161

SHADE & SHADOWS ~ .~ .'>: . i...('(. 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