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NAME
     ico2 - animate an icosahedron or other polyhedron

SYNOPSIS
     ico2 [ -r ] [ -d pattern ] [ -i] [ -dbl ] [  -faces  ]  [  -
     noedges  ]  [  -sleep  n  ] [ -obj object ] [ -objhelp ] [ -
     colors color-list ]

DESCRIPTION
     Ico2 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  avail-
     able;  adding  a new polyhedron to the program is quite sim-
     ple.

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  substan-
          tially  smoother  movement.   Note  that  this requires
          twice as many bit planes as without  double  buffering.
          Since some colors are typically allocated by other pro-
          grams, 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  speci-
          fied, an icosahedron is drawn.

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

     -colors colorlist
          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.

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 objname.h, where name 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 objname.h file
     should be, then create your objname.h file in that format.

     After making the new objname.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
     objname.h files.  Doing a 'make' after this will rebuild ico
     with the new object information.

BUGS
     If -dbl or -colors is specified on a monochrome  screen,  or
     if  the  number  of  bit  planes needed is more than what is
     available, the server hangs (this is on a Sun 3/60,  patches
     up to 80 applied).

     A separate color cell is allocated for each name  in  the  -
     colors list, even when the same name may be specified twice.

SEE ALSO
     ico(6)

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