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.