Provided by: xscreensaver-gl-extra_5.15-2ubuntu1_amd64 bug

NAME

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

SYNOPSIS

       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]

DESCRIPTION

       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.

       Spacebar
               Return to automatic control.

OPTIONS

       crackberg accepts the following options:

       -root   Draw on the root window.

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

       -install
               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 visual.

       -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.

       -letterbox
               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.

       -nowater
               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 tile.

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  ©  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 warranty.

AUTHOR

       Matus Telgarsky <catachresis@cmu.edu>, 2005.