Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 225
the shade and shadow^of a polyhedron, none ofwhose faces are parallel orperpendicular to the co=or=dinate planes. Fig 20 shows a poly-hedron in such a positionand of such a shape thatnone of its faces are per-pendicular or parallel to theco-ordinate planes. It isimpossible, therefore, to apply to… … 182 SHADES AND SHADOWS 13 FIG* 21 Under these circunistanees toe must cast the shadows of allthe houndary edges of the ol>ject. Some of these lines of shadowwill form a polygon, the others will fall inside this polygon. Theedges of the object whose shadows form the bounding lines of thepolygon…
Architecture · Building
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