ico(1)

     NAME
          ico - animate an icosahedron or other polyhedron

     SYNOPSIS
          ico [-display display] [-geometry geometry] [-r] [-d
          pattern] [-i] [-dbe] [-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.

          -dbe 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.

     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(1)

     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.

     COPYRIGHT
          Copyright 1988, Massachusetts Institute of Technology.
          See X(1) for a full statement of rights and permissions.