glschool(6) XScreenSaver manual glschool(6) NAME glschool - a 3D schooling simulation SYNOPSIS glschool [--display host:display.screen] [--visual visual] [--window] [--root] [--window-id number] [--wireframe] [--fps] [--delay number] [--nfish number] [--maxvel number] [--minvel number] [--acclimit number] [--avoidfact number] [--matchfact number] [--centerfact number] [--target- fact number] [--minradius number] [--momentum number] [--distexp number] [--goalchgf number] [--fog] [--drawgoal] [--drawbbox] DESCRIPTION Uses the Craig Reynolds Boids algorithm to simulate a 3D school of fish. This is a lightly modified version of the algorithm that supports goal at- traction. Many different behaviors are possible by tweaking the parameters. No san- ity checking is performed on the command line params, so if you want to use negative accelerations or minimum velocity that is larger than maximum ve- locity 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. --window-id number Draw on the specified window. --delay number Per-frame delay, in microseconds. Default: 20000 (0.020 seconds.). --wireframe | --no-wireframe Render in wireframe instead of solid. --fps Display the current frame rate, CPU load, and polygon count. --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 re- sources stored in the RESOURCE_MANAGER property. XSCREENSAVER_WINDOW The window ID to use with --root. SEE ALSO X(1), xscreensaver(1), https://www.red3d.com/cwr/boids COPYRIGHT Copyright (C) 2005-2006 by David C. Lambert. Permission to use, copy, mod- ify, distribute, and sell this software and its documentation for any pur- pose is hereby granted without fee, provided that the above copyright no- tice appear in all copies and that both that copyright notice and this per- mission notice appear in supporting documentation. No representations are made about the suitability of this software for any purpose. It is pro- vided "as is" without express or implied warranty. AUTHOR David C. Lambert X Version 11 6.15 (30-Mar-2026) glschool(6)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | SEE ALSO | COPYRIGHT | AUTHOR
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