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NAME

       fluidballs - the physics of bouncing balls.

SYNOPSIS

       fluidballs  [-display  host:display.screen]  [-visual visual] [-window]
       [-root] [-count number] [-size number] [-gravity number] [-wind number]
       [-elasticity number] [-delay number] [-nonrandom] [-no-shake] [-fps]

DESCRIPTION

       Models  the  physics  of  bouncing  balls,  or of particles in a gas or
       fluid, depending on the settings. If  "Shake  Box"  is  selected,  then
       every  now  and then, the box will be rotated, changing which direction
       is down (in order to keep the settled balls in motion.)

OPTIONS

       -visual visual
               Specify which visual to use.  Legal values are the  name  of  a
               visual  class,  or the id number (decimal or hex) of a specific
               visual.

       -window Draw on a newly-created window.  This is the default.

       -root   Draw on the root window.

       -count number
               How many balls to display.  Default: 300.

       -size number
               Maximum size of each ball.  Default: 25.

       -gravity number
               Coefficient of gravity.  Useful values  are  <  0.1.   Default:
               0.01.

       -wind number
               Wind.  Useful values are < 0.1.  Default: 0.00.

       -elasticity number
               Coefficient  of  elasticity.   Useful  values  are  0.2 to 1.0.
               Default: 0.97.  Lower numbers make less bouncy balls.

       -delay number
               Per-frame  delay,  in  microseconds.   Default:   10000   (0.01
               seconds.).

       -nonrandom
               Make all balls be the same size.

       -no-nonrandom
               Make the balls be random sizes.  Default.

       -shake | -no-shake
               Whether  to  shake  the box if the system seems to have settled
               down.  "Shake" means "change the direction of Down."

       -fps | -no-fps
               Whether to show a frames-per-second display at  the  bottom  of
               the screen.

ENVIRONMENT

       DISPLAY to get the default host and display number.

       XENVIRONMENT
               to  get  the  name of a resource file that overrides the global
               resources stored in the RESOURCE_MANAGER property.

SEE ALSO

       X(1), xscreensaver(1)

COPYRIGHT

       Copyright © 2002 by Peter Birtles and Jamie  Zawinski.   Permission  to
       use,   copy,  modify,  distribute,  and  sell  this  software  and  its
       documentation for any purpose is hereby granted without  fee,  provided
       that the above copyright notice appear in all copies and that both that
       copyright notice  and  this  permission  notice  appear  in  supporting
       documentation.   No  representations  are made about the suitability of
       this software for any purpose.  It is provided "as is" without  express
       or implied warranty.

AUTHOR

       Peter Birtles, Jamie Zawinski, and Steven Barker.