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glschool

Section: XScreenSaver manual (6)
Updated: 5.04 (13-Nov-2007)
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NAME

glschool - a 3D schooling simulation  

SYNOPSIS

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]  

DESCRIPTION

Uses Craig Reynolds Boids algorithm to simulate a 3d school of fish. See <http://www.red3d.com/cwr/boids> 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.

 

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

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 © 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 warranty.  

AUTHOR

David C. Lambert


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
ENVIRONMENT
SEE ALSO
COPYRIGHT
AUTHOR




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