NAME

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

SYNOPSIS

       crackberg  [--root] [--window-id number] [--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-id number
               Draw on the specified 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.

       XSCREENSAVER_WINDOW
               The window ID to use with --root.

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.