Provided by: xscreensaver-gl-extra_5.11-1ubuntu2_i386 bug

NAME

       blocktube - draws a swirling, falling tunnel of reflective slabs

SYNOPSIS

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

DESCRIPTION

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

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:   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.

       -no-texture
               Draw solid blocks intstead of reflective blocks.

       -no-fog Do not make blocks in the distance be darker.

       -wireframe
               Only draw outlines.

       -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  (C)  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.

AUTHOR

       Lars Damerow <lars@oddment.org>