From http://www.jwz.org/xscreensaver/xscreensaver-5.24.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.