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Comparing ray/doc/man/man1/rad.1 (file contents):
Revision 1.5 by greg, Tue Sep 4 17:36:40 2007 UTC vs.
Revision 1.7 by greg, Mon Nov 10 19:08:17 2008 UTC

# Line 295 | Line 295 | command line option.
295   Also, there are several standard view identifiers defined by
296   .I rad.
297   These standard views are specified by strings of the form
298 < "[Xx]?[Yy]?[Zz]?[vlcah]?".
298 > "[Xx]?[Yy]?[Zz]?[vlcahs]?".
299   (That is, an optional upper or lower case X followed by an optional
300   upper or lower case Y followed by an optional upper or lower case Z
301   followed by an optional lower case V, L, C, A or H.)\0
# Line 303 | Line 303 | The letters indicate the desired view position, where
303   means maximum X, lower case means minimum and so on.
304   The final letter is the view type, where 'v' is perspective (the
305   default), 'l' is parallel, 'c' is a cylindrical panorama,
306 < 'a' is angular fisheye, and 'h' is hemispherical fisheye.
306 > 'a' is angular fisheye, 'h' is hemispherical fisheye, and 's'
307 > is a planisphere (stereographic) fisheye.
308   A perspective view from maximum X, minimum Y would be "Xy" or "Xyv".
309   A parallel view from maximum Z would be "Zl".
310   If "ZONE" is an interior zone, the standard views will
# Line 370 | Line 371 | The default value is 0.
371   .BR PICTURE
372   This is the root name of the output picture file(s).
373   This name will have appended the view identifier (or a number if no
374 < id was used) and a ".pic" suffix.
374 > id was used) and a ".hdr" suffix.
375   If a picture corresponding to a specific view exists and is not out
376   of date with respect to the given octree, it will not be
377   re-rendered.
# Line 566 | Line 567 | DET= low               # default was medium - our space is almost e
567   PEN= True               # we want to see soft shadows from our window
568   VAR= hi         # daylight can result in fairly harsh lighting
569   view= XYa \-vv 120      # let's try a fisheye view
570 < PICT= tutor             # our picture name will be "tutor_XYa.pic"
570 > PICT= tutor             # our picture name will be "tutor_XYa.hdr"
571   .fi
572   .PP
573   Note the use of abbreviations, and the modification of a standard

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