Provided by: xscreensaver-gl_5.36-1ubuntu1_amd64 
NAME
glblur - 3D radial blur texture fields
SYNOPSIS
glblur [-display host:display.screen] [-visual visual] [-window] [-root] [-delay number] [-blursize
number] [-no-wander] [-no-spin] [-spin [XYZ]] [-fps]
DESCRIPTION
This program draws a box and a few line segments, and generates a radial blur outward from it. This
creates flowing field effects.
This is done by rendering the scene into a small texture, then repeatedly rendering increasingly-enlarged
and increasingly-transparent versions of that texture onto the frame buffer. As such, it's quite
graphics intensive: don't bother trying to run this if you don't have hardware-accelerated texture
support. It will hurt your machine bad.
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: 10000 (0.01 seconds.).
-blursize number
How many copies of the scene should be laid down to make the vapor trail. Default: 15. Larger
numbers create smoother fields, but are slower.
-wander | -no-wander
Whether the object should wander around the screen.
-spin [XYZ]
Around which axes should the object spin?
-no-spin
None.
-fps Display the current frame rate, CPU load, and polygon count.
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 © 2002 by Jamie Zawinski. 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
Jamie Zawinski, with inspiration from a tutorial by Dario Corno.