/[gzz]/manuscripts/xupdf/article.rst
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revision 1.197 by Vegai, Sat Feb 15 23:31:00 2003 UTC revision 1.198 by benja, Sat Feb 15 23:31:35 2003 UTC
# Line 485  Nadir Line 485  Nadir
485    
486  When a person places papers on a desk, they  When a person places papers on a desk, they
487  are usually not placed in the same orientation with each other  are usually not placed in the same orientation with each other
488  (unless explicitly building a grid).  (unless the person is explicitly building a grid).
489  Rather, the papers are arranged so that the bottom edge of  Rather, the papers are arranged so that the bottom edge of
490  the page points towards the viewer, i.e. there's a kind of  each page points towards the viewer, i.e. so that there's a kind of
491  "vanishing point" at the viewer's stomach.  "vanishing point" at the viewer's stomach.
492    
493  We have found that simulating this on a computer screen  We have found that simulating this on a computer screen
# Line 503  at approximately one screen height below Line 503  at approximately one screen height below
503     are rotated so that their local vertical axis points to     are rotated so that their local vertical axis points to
504     the vanishing point (nadir) placed outside the screen.     the vanishing point (nadir) placed outside the screen.
505    
506  Interestingly, it appears in our experience  Interestingly, in our experience, it seems
507  that the placement of the nadir should  that the placement of the nadir should
508  be an absolute *angle* below the center of the screen from  be at an absolute *angle* below the center of the screen from
509  the viewer's point of view, rather than related to the size  the viewer's point of view, rather than related to the size
510  of the screen.  of the screen.
511    

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