Provided by: xscreensaver-gl-extra_5.08-0ubuntu3_i386 bug


        blocktube - draws a swirling, falling tunnel of reflective slabs


        blocktube  [-display  host:display.screen]  [-visual  visual] [-window]
        [-root] [-delay number] [-holdtime number] [-changetime  number]  [-no-
        texture] [-no-fog] [-wireframe] [-fps]


        Blocktube  draws  a  swirling, falling tunnel of reflective slabs. They
        fade from hue to hue.


        -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
        -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:  40000  (0.04  sec-
        -holdtime number
                How long to stay on the same color.  Default: 1000 frames.
        -changetime number
                How long it takes to fade to a new color.  Default: 200 frames.
                Draw solid blocks intstead of reflective blocks.
        -no-fog Do not make blocks in the distance be darker.
                Only draw outlines.
        -fps    Display the current frame rate, CPU load, and polygon count.


        DISPLAY to get the default host and display number.
                to get the name of a resource file that  overrides  the  global
                resources stored in the RESOURCE_MANAGER property.
        X(1), xscreensaver(1)


        Copyright  (C)  2003 by Lars Damerow.  Permission to use, copy, modify,
        distribute, and sell this software and its documentation for  any  pur-
        pose  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 repre-
        sentations are made about the suitability of this software for any pur-
        pose.  It is provided "as is" without express or implied warranty.


        Lars Damerow <>