From http://www.jwz.org/xscreensaver/xscreensaver-5.25.tar.gz

[xscreensaver] / hacks / glx / blocktube.man

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+.TH XScreenSaver 1 "" "X Version 11"
+.SH NAME
+blocktube - draws a swirling, falling tunnel of reflective slabs
+.SH SYNOPSIS
+.B blocktube
+[\-display \fIhost:display.screen\fP]
+[\-visual \fIvisual\fP]
+[\-window]
+[\-root]
+[\-delay \fInumber\fP]
+[\-holdtime \fInumber\fP]
+[\-changetime \fInumber\fP]
+[\-no-texture]
+[\-no-fog]
+[\-wireframe]
+[\-fps]
+.SH DESCRIPTION
+Blocktube draws a swirling, falling tunnel of reflective slabs. They fade 
+from hue to hue.
+.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: 40000 (0.04 seconds.).
+.TP 8
+.B \-holdtime \fInumber\fP
+How long to stay on the same color.  Default: 1000 frames.
+.TP 8
+.B \-changetime \fInumber\fP
+How long it takes to fade to a new color.  Default: 200 frames.
+.TP 8
+.B \-no-texture
+Draw solid blocks intstead of reflective blocks.
+.TP 8
+.B \-no-fog
+Do not make blocks in the distance be darker.
+.TP 8
+.B \-wireframe
+Only draw outlines.
+.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 2003 by Lars Damerow.  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
+Lars Damerow <lars@oddment.org>