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       glschool - a 3D schooling simulation


       glschool  [-display  host:display.screen]  [-visual  visual]  [-window]
       [-root] [-wireframe] [-fps] [-delay number]  [-nfish  number]  [-maxvel
       number]   [-minvel   number]  [-acclimit  number]  [-avoidfact  number]
       [-matchfact   number]   [-centerfact   number]   [-targetfact   number]
       [-minradius  number]  [-momentum  number]  [-distexp number] [-goalchgf
       number] [-fog] [-drawgoal] [-drawbbox]


       Uses Craig Reynolds Boids algorithm to simulate a 3d  school  of  fish.
       See <> for a description of the algorithm
       and the original paper.  This is a  lightly  modified  version  of  the
       algorithm that supports goal attraction.

       Many  different  behaviors are possible by tweaking the parameters.  No
       sanity checking is performed on the command line params, so if you want
       to  use  negative accelerations or minimum velocity that is larger than
       maximum velocity or that sort of thing,  the  simulation  will  try  to
       digest it.

       It looks best with the highest number of fish that will give you an FPS
       of > 25 or so.


       -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

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

       -root   Draw on the root window.

       -delay number
               Per-frame  delay,  in  microseconds.   Default:  20000   (0.020

       -wireframe | -no-wireframe
               Render in wireframe instead of solid.

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

       -fog | -no-fog
                Whether to show foggy (cloudy) water.

       -drawgoal | -no-drawgoal
                Whether to show the school’s attraction goal.

       -drawbbox | -no-drawbbox
                Whether to show the bounding box.

       -fog | -no-fog
                Whether to show foggy (cloudy) water.

       -nfish number
               Number of fish.  Defaults to 100

       -acclimit number
               Acceleration limit.  Defaults to 8.0

       -minvel number
               Minimum velocity.  Defaults to 1.0

       -maxvel number
               Minimum velocity.  Defaults to 7.0

       -goalchgf number
               Goal change frequency.  Defaults to 50 (frames)

       -avoidfact number
               Avoidance acceleration factor.  Defaults to 1.5

       -matchfact number
               Match avg velocity acceleration factor.  Defaults to 0.15

       -centerfact number
               School centering acceleration factor.  Defaults to 0.1

       -targetfact number
               Target attraction acceleration factor.  Defaults to 80

       -distexp number
               Distance weighting exponent.  Defaults to 2.2

       -momentum number
               Momentum.  Defaults to 0.9


       DISPLAY to get the default host and display number.

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


       X(1), xscreensaver(1)


       Copyright  ©  2005-2006  by David C. Lambert.  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


       David C. Lambert