NAME

       ico - animate an icosahedron or other polyhedron

SYNOPSIS

       ico  [-display  display]  [-geometry  geometry]  [-r]  [-d  pattern]  [-i] [-dbl] [-faces]
       [-noedges] [-sleep n] [-obj object] [-objhelp] [-colors color-list]

DESCRIPTION

       Ico displays a wire-frame rotating polyhedron, with hidden lines removed, or a  solid-fill
       polyhedron  with  hidden  faces  removed.   There  are  a  number  of  different polyhedra
       available; adding a new polyhedron to the program is quite simple.

OPTIONS

       -r     Display on the root window instead of creating a new window.

       -d pattern
              Specify a bit pattern for drawing dashed lines for wire frames.

       -i     Use inverted colors for wire frames.

       -dbl   Use double buffering on the display.  This works for either  wire  frame  or  solid
              fill drawings.  For solid fill drawings, using this switch results in substantially
              smoother movement.  Note that this requires twice as many  bit  planes  as  without
              double  buffering.   Since  some  colors are typically allocated by other programs,
              most eight-bit-plane displays will probably be limited to eight colors  when  using
              double buffering.

       -faces Draw filled faces instead of wire frames.

       -noedges
              Don't draw the wire frames.  Typically used only when -faces is used.

       -sleep n
              Sleep n seconds between each move of the object.

       -obj object
              Specify what object to draw.  If no object is specified, an icosahedron is drawn.

       -objhelp
              Print  out  a  list  of  the  available  objects, along with information about each
              object.

       -colors color color ...
              Specify what colors should be used to draw the filled faces of the object.  If less
              colors than faces are given, the colors are reused.

PROGRAM TERMINATION

       Pressing  "q" will close a window. If compiled with threads support, the program will stop
       only when all threads terminate. You can also close an animation window  using  the  ICCCM
       delete  message  (depending  on  your window manager, you will have a decoration button or
       menu to send such message).

ADDING POLYHEDRA

       If you have the source to ico, it is very easy to add more polyhedra.  Each polyhedron  is
       defined  in an include file by the name of objXXX.h, where XXX is something related to the
       name of the polyhedron.  The format of the include file is defined in the file polyinfo.h.
       Look  at  the  file  objcube.h to see what the exact format of an objXXX.h file should be,
       then create your objXXX.h file in that format.

       After making the new objXXX.h file (or copying in a new one from elsewhere), simply  do  a
       'make  depend'.   This  will  recreate the file allobjs.h, which lists all of the objXXX.h
       files.  Doing a 'make' after this will rebuild ico with the new object information.

SEE ALSO

       X(7)

BUGS

       Pyramids and tetrahedrons with filled faces do not display correctly.

       A separate color cell is allocated for each name in the -colors list, even when  the  same
       name  may  be  specified  twice.   Color allocation fails in TrueColor displays and option
       -faces does not work well.

COPYRIGHT

       Copyright 1994 X Consortium
       See X(7) for a full statement of rights and permissions.