A text-book on shades and shadows, and perspective (1900)
Hill, John Edward, 1864- · New York, J. Wiley & Sons; [etc., etc.] · leaf 16
ed in position by-being so placed with reference to the coordinate planes thata line of light forms one of the diagonals of a cube, two ofwhose faces are the coordinate planes. If the spectator werein the first dihedral angle looking at V, the source of lightwould be at an infinite distance above… … Fig, t. spective view of a cube, two of whose faces, gfe i and b c e i,are in H and V respectively, and the diagonal R through aand e gives the direction of a line of light to which all linesof light are parallel. [d) All lines of sight for either coordinate plane are parallelright lines…
Shades and shadows · Perspective
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