Provided by: xscreensaver-gl-extra_5.34-2ubuntu1_amd64 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]


       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 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: 40000 (0.04 seconds.).

       -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  ©  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.


       Lars Damerow <>