From http://www.jwz.org/xscreensaver/xscreensaver-5.24.tar.gz

[xscreensaver] / hacks / glx / glblur.man

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-.TH XScreenSaver 1 "" "X Version 11"
-.SH NAME
-glblur - 3D radial blur texture fields
-.SH SYNOPSIS
-.B glblur
-[\-display \fIhost:display.screen\fP]
-[\-visual \fIvisual\fP]
-[\-window]
-[\-root]
-[\-delay \fInumber\fP]
-[\-blursize \fInumber\fP]
-[\-no-wander]
-[\-no-spin]
-[\-spin \fI[XYZ]\fP]
-[\-fps]
-.SH 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.
-.SH OPTIONS
-.TP 8
-.B \-visual \fIvisual\fP
-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.
-.TP 8
-.B \-window
-Draw on a newly-created window.  This is the default.
-.TP 8
-.B \-root
-Draw on the root window.
-.TP 8
-.B \-delay \fInumber\fP
-Per-frame delay, in microseconds.  Default: 10000 (0.01 seconds.).
-.TP 8
-.B \-blursize \fInumber\fP
-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.
-.TP 8
-.B \-wander | \-no-wander
-Whether the object should wander around the screen.
-.TP 8
-.B \-spin [XYZ]
-Around which axes should the object spin?
-.TP 8
-.B \-no-spin
-None.
-.TP 8
-.B \-fps
-Display the current frame rate, CPU load, and polygon count.
-.SH ENVIRONMENT
-.PP
-.TP 8
-.B DISPLAY
-to get the default host and display number.
-.TP 8
-.B XENVIRONMENT
-to get the name of a resource file that overrides the global resources
-stored in the RESOURCE_MANAGER property.
-.SH SEE ALSO
-.BR X (1),
-.BR xscreensaver (1)
-.SH COPYRIGHT
-Copyright \(co 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.
-.SH AUTHOR
-Jamie Zawinski, with inspiration from a tutorial by Dario Corno.