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


       crackberg  -  Lose  your  way  wandering  some height fields, and enjoy


       crackberg [-root] [-window] [-install]  [-display  host:display.screen]
       [-visual  visual] [-window-id id] [-delay usecs] [-fps] [-crack] [-lit]
       [-boring] [-letterbox] [-flat] [-wire] [-nowater]  [-visibility  float]
       [-color string] [-nsubdivs integer]


       Flies  through  height maps, optionally animating the instantiation and
       destruction of generated tiles; by default,  tiles  'grow'  into  place
       (height gradually increased up to correct value).  In windowed mode the
       following key controls are available:

       left, right
               Turn left and right.

       a,w,s,d Move left, forwards, backwards, and to the right, respectively.

       1,2     Decrease and increase manual speed, respectively.

               Return to automatic control.


       crackberg accepts the following options:

       -root   Draw on the root window.

       -window Draw on a newly-created window.  This is the default.

               Install a private colormap for the window.

       -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

       -delay microseconds
               Delay between frames; default 20000 (1/50th of a second).

       -fps    Display the current frame rate, CPU load, and polygon count.

       -crack  Use all possible methods to animate tile instantiation.

       -boring Do  not  animate  instatiation at all; use this to get standard
               landscape generator behavior.

               Drawable window region has a 16:9 aspect ratio,  regardless  of
               actual window size.

       -lit    Enable lighting.

       -flat   Flat  shading  (OpenGL will use one color per primitive, rather
               than interpolating betwixt vertices).

       -wire   Wireframe.

               Do not display 'water' (forces negative  values  to  zero,  and
               selects a different coloring method).

       -visibility float
               Value in range [0.2,1.0] (default 0.6) specifying proportion of
               viewable XY plane which is to be drawn upon.

       -color string
               Selects color scheme.   Use  with  no  or  bogus  argument  for
               current list.

       -nsubdivs integer
               Number  of times to recursively subdivide each triangular tile.
               Each increment increases total triangles by a factor of 4;  for
               instance  the  default  setting  4 results in 256 triangles per


       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)  2005  by  Matus  Telgarsky.   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


       Matus Telgarsky <>, 2005.