glschool man page

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

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 resources stored in the RESOURCE_MANAGER property.

See Also

X(1), xscreensaver(1)

Author

David C. Lambert

Info

5.36-4.fc26 (10-Feb-2017) X Version 11 XScreenSaver manual