Shades and shadows, with applications to architectural details, and exercises in drawing them with the brush and pen .. (1912)
Ware, William R. (William Robert), 1832-1915 · Scranton, International Textbook Company · leaf 50
\ 51. It follows that a right octagonal pyramid which has two sides of the base parallel to the planes ofprojection (Fig. 36) will have three faces in shade, if its slope is less than 45 degrees; and none, if it is lessthan the angle <^. If the slope is just 45 degrees, two of the faces will be…
Shades and shadows
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