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       glrad - render a RADIANCE scene using OpenGL


       glrad [ -w ][ -b ][ -s ][ -S ][ -v view ] rfile [ VAR=value ..  ]


       Glrad  renders  a Radiance scene description in OpenGL.  Its syntax and
       behavior is similar to rad(1) with the  -o  option,  where  the  output
       device is assumed to be an X11 server with GLX extensions.

       The -w option turns off warnings.  The -s option tells glrad to run rad
       silently, not echoing oconv(1) command.  The -b option turns  off  back
       face  visibility (i.e., enables back face culling).  This is equivalent
       to the -bv option of rpict(1) and rvu(1).  The -S option turns on full-
       screen   stereo  for  displays  that  support  it.   (Be  sure  to  run
       /usr/gfx/setmon(1)  or  its  equivalent  to  set  STR_TOP  or  STR_BOT,
       first.)   The  -v option may be used to specify a starting view, either
       by symbolic name as entered in the view assignments in rfile, or  by  a
       complete  view  specification,  enclosed  in  quotes.   If  no  view is
       specified, then the first standard view from rfile is used to start.

       Variables permitted in rfile are described  in  the  rad  manual  page.
       Additional  or  overriding assignments may be given on the command line
       following rfile.

       The view is controlled via the mouse and simple one-character commands,
       listed below:

       (mouse)   Modify  the  current  view.  The mouse is used to control the
                 current view in the following ways:

                 CONTROL   MOUSE     ACTION
                 (none)    left Move forward towards cursor position
                 (none)    right     Move backward away from cursor position
                 (none)    middle    Rotate in place (usually safe)
                 shift     left Orbit left around cursor position
                 shift     right     Orbit right around cursor position
                 shift     middle    Orbit skyward
                 cntl middle    Orbit earthward

                 For all movements but rotating in place, the cursor  must  be
                 placed  over  some  bit  of  visible  geometry, otherwise the
                 program has no reference point from which  to  work.   It  is
                 best  to  just experiment with these controls until you learn
                 to fly safely in your model.  And if you  run  into  trouble,
                 the ’l’ command is very useful.  (See below.)

       ’+’       Zoom in on the current cursor position.  (Beware of repeating
                 keys that go faster than the display updates.)

       ’-’       Zoom out from the current cursor position.

       ’l’       Return to the last saved  view.   Each  time  a  new  command
                 changes  the current view, the last view is saved, and may be
                 recalled with  this  command.   Multiple  uses  of  the  same
                 command (e.g., rotation, zoom) will save only the view before
                 the first such command.  This way, it is easy to get back  to
                 where you were before a sequence of view changes.

       ’h’       Fix  the head height.  All mouse-controlled view motions will
                 be adjusted so that the head height does  not  change  (where
                 vertical is determined by the current view up vector).

       ’H’       Release  the  head height, allowing it to change again during
                 mouse-controlled movements.

       ’v’       Print the current view parameters  to  the  standard  output.
                 This  is  useful for finding out where you are, or for saving
                 specific views in a keyframe file for animations or returning
                 to later.

       ’V’       Append  the  current  view  to the original rfile.  This view
                 will be unnamed, but can be referred to by number or the user
                 may  add  a  name later with a text editor.  The current view
                 number becomes the last standard view.  (See the ’n’ and  ’p’
                 commands, below.)

       ’n’       Go  to  the  next standard view stored in rfile.  If the last
                 view is currently displayed, then cycle to the first one.

       ’p’       Go to the previous standard view stored  in  rfile.   If  the
                 first  view  is  currently  displayed, then cycle to the last

       ’q’       Quit glrad.  This is the normal way to exit the program.


       Greg Ward Larson


       It would be nice if glrad set the appropriate video format  for  stereo
       viewing  automatically,  but  the  process  is  different  on different
       systems and there is no single, sure-fire way to do it for all systems.
       On  systems  that  do not support stereo extensions, the program may be
       compiled with the -DNOSTEREO option, which will avoid undefined  symbol


       chmod(1),  getinfo(1),  ls(1),  objview(1),  oconv(1),  ps(1),  rad(1),
       ranimate(1),  rhcopy(1),   rholo(1),   rpict(1),   rtrace(1),   rvu(1),