1glschool(6x) XScreenSaver manual glschool(6x)
2
6 glschool - a 3D schooling simulation
7
9 glschool [-display host:display.screen] [-visual visual] [-window]
10 [-root] [-wireframe] [-fps] [-delay number] [-nfish number] [-maxvel
11 number] [-minvel number] [-acclimit number] [-avoidfact number]
12 [-matchfact number] [-centerfact number] [-targetfact number] [-minra‐
13 dius number] [-momentum number] [-distexp number] [-goalchgf number]
14 [-fog] [-drawgoal] [-drawbbox]
15
17 Uses Craig Reynolds Boids algorithm to simulate a 3d school of fish.
18 See <http://www.red3d.com/cwr/boids> for a description of the algorithm
19 and the original paper. This is a lightly modified version of the
20 algorithm that supports goal attraction.
21 Many different behaviors are possible by tweaking the parameters. No
23 sanity checking is performed on the command line params, so if you want
24 to use negative accelerations or minimum velocity that is larger than
25 maximum velocity or that sort of thing, the simulation will try to
26 digest it.
27 It looks best with the highest number of fish that will give you an FPS
29 of > 25 or so.
30
33 -visual visual
34 Specify which visual to use. Legal values are the name of a
35 visual class, or the id number (decimal or hex) of a specific
36 visual.
37 -window Draw on a newly-created window. This is the default.
39 -root Draw on the root window.
41 -delay number
43 Per-frame delay, in microseconds. Default: 20000 (0.020 sec‐
44 onds.).
45 -wireframe | -no-wireframe
47 Render in wireframe instead of solid.
48 -fps | -no-fps
50 Whether to show a frames-per-second display at the bottom of
51 the screen.
52 -fog | -no-fog
54 Whether to show foggy (cloudy) water.
55 -drawgoal | -no-drawgoal
57 Whether to show the school's attraction goal.
58 -drawbbox | -no-drawbbox
60 Whether to show the bounding box.
61 -fog | -no-fog
63 Whether to show foggy (cloudy) water.
64 -nfish number
66 Number of fish. Defaults to 100
67 -acclimit number
69 Acceleration limit. Defaults to 8.0
70 -minvel number
72 Minimum velocity. Defaults to 1.0
73 -maxvel number
75 Minimum velocity. Defaults to 7.0
76 -goalchgf number
78 Goal change frequency. Defaults to 50 (frames)
79 -avoidfact number
81 Avoidance acceleration factor. Defaults to 1.5
82 -matchfact number
84 Match avg velocity acceleration factor. Defaults to 0.15
85 -centerfact number
87 School centering acceleration factor. Defaults to 0.1
88 -targetfact number
90 Target attraction acceleration factor. Defaults to 80
91 -distexp number
93 Distance weighting exponent. Defaults to 2.2
94 -momentum number
96 Momentum. Defaults to 0.9
97
99 DISPLAY to get the default host and display number.
100 XENVIRONMENT
102 to get the name of a resource file that overrides the global
103 resources stored in the RESOURCE_MANAGER property.
104
106 X(1), xscreensaver(1)
107
109 Copyright © 2005-2006 by David C. Lambert. Permission to use, copy,
110 modify, distribute, and sell this software and its documentation for
111 any purpose is hereby granted without fee, provided that the above
112 copyright notice appear in all copies and that both that copyright
113 notice and this permission notice appear in supporting documentation.
114 No representations are made about the suitability of this software for
115 any purpose. It is provided "as is" without express or implied war‐
116 ranty.
117
119 David C. Lambert
120X Version 11 5.05-3 (06-Apr-2008) glschool(6x)