From http://www.jwz.org/xscreensaver/xscreensaver-5.25.tar.gz

[xscreensaver] / hacks / glx / crackberg.man

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+.TH XScreenSaver 1 "" "X Version 11"
+.SH NAME
+crackberg - Lose your way wandering some height fields, and enjoy candy.
+.SH SYNOPSIS
+.B crackberg
+[\-root]
+[\-window]
+[\-install]
+[\-display \fIhost:display.screen\fP]
+[\-visual \fIvisual\fP]
+[\-window-id \fIid\fP]
+[\-delay \fIusecs\fP]
+[\-fps]
+[\-crack]
+[\-lit]
+[\-boring]
+[\-letterbox]
+[\-flat]
+[\-wire]
+[\-nowater]
+[\-visibility \fIfloat\fP]
+[\-color \fIstring\fP]
+[\-nsubdivs \fIinteger\fP]
+.SH 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:
+.TP 8
+.B left, right
+Turn left and right.
+.TP 8
+.B a,w,s,d
+Move left, forwards, backwards, and to the right, respectively.
+.TP 8
+.B 1,2
+Decrease and increase manual speed, respectively.
+.TP 8
+.B Spacebar
+Return to automatic control.
+.SH OPTIONS
+.I crackberg
+accepts the following options:
+.TP 8
+.B \-root
+Draw on the root window.
+.TP 8
+.B \-window
+Draw on a newly-created window.  This is the default.
+.TP 8
+.B \-install
+Install a private colormap for the window.
+.TP 8
+.B \-visual \fIvisual\fP
+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.
+.TP 8
+.B \-delay \fImicroseconds\fP
+Delay between frames; default 20000 (1/50th of a second).
+.TP 8
+.B \-fps
+Display the current frame rate, CPU load, and polygon count.
+.TP 8
+.B \-crack
+Use all possible methods to animate tile instantiation.
+.TP 8
+.B \-boring
+Do not animate instatiation at all; use this to get standard landscape 
+generator behavior.
+.TP 8
+.B \-letterbox
+Drawable window region has a 16:9 aspect ratio, regardless of actual
+window size.
+.TP 8
+.B \-lit
+Enable lighting.
+.TP 8
+.B \-flat
+Flat shading (OpenGL will use one color per primitive, rather than
+interpolating betwixt vertices).
+.TP 8
+.B \-wire
+Wireframe.
+.TP 8
+.B \-nowater
+Do not display 'water' (forces negative values to zero, and selects a 
+different coloring method).
+.TP 8
+.B \-visibility \fIfloat\fP
+Value in range [0.2,1.0] (default 0.6) specifying proportion of viewable 
+XY plane which is to be drawn upon.
+.TP 8
+.B \-color \fIstring\fP
+Selects color scheme.  Use with no or bogus argument for current list.
+.TP 8
+.B \-nsubdivs \fIinteger\fP
+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.
+
+.SH ENVIRONMENT
+.PP
+.TP 8
+.B DISPLAY
+to get the default host and display number.
+.TP 8
+.B XENVIRONMENT
+to get the name of a resource file that overrides the global resources
+stored in the RESOURCE_MANAGER property.
+.SH SEE ALSO
+.BR X (1),
+.BR xscreensaver (1)
+.SH COPYRIGHT
+Copyright \(co 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.
+.SH AUTHOR
+Matus Telgarsky <catachresis@cmu.edu>, 2005.