XScreenSaver(1) 					      General Commands Manual						   XScreenSaver(1)

NAME

       rocks - animation of flying through an asteroid field

SYNOPSIS

       rocks  [-display  host:display.screen]  [-foreground  color] [-background color] [-window] [-root] [-mono] [-ncolors n] [-install] [-visual
       visual] [-count integer] [-delay usecs] [-speed integer] [-norotate] [-nomove] [-3d]

DESCRIPTION

       The rocks program draws an animation of an asteroid field moving past the observer (or vice versa).  Sometimes the observer picks  up  spin
       on Z axis.

OPTIONS

       rocks accepts the following options:

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

       -root   Draw on the root window.

       -mono   Make all the rocks the same color.

       -ncolors colors
	       How many different colors to use.  Default 5.  Colors are chosen randomly.

       -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.

       -count integer
	       Maximum number of rocks to draw on the screen at once.  Default 100.

       -speed integer
	       A  measure  of the speed with which the observer and the rocks pass each other, from 1 to 100.  Default 100, meaning ``very fast.''
	       If you're on a slow display connection (the animation looks jerky) then try making this number smaller, and/or decreasing the  num-
	       ber of rocks.

       -delay microseconds
	       Number of microseconds to delay between each frame.  Default 50000, meaning about 1/20th second.  Compare and contrast with -speed,
	       above.

       -norotate
	       Don't rotate the observer; just fly through the field on the level.

       -nomove Don't turn the observer; just fly straight ahead through the field.

       -3d     Do red/blue 3d separations: if you look at the screen with 3d glasses, the rocks  will  be  jumping  right  out	at  you.   Oooooh,
	       scaaary!

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)

BUGS

       There should be an option to display doppler shift (a gravity rainbow.)

       Speed of rotation should be settable.

       Default speed of rotation should be relative to forward velocity.

COPYRIGHT

       Copyright  (C)  1992  by Jamie Zawinski.  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

       Based on Lisp Machine code copyright 1988 John Nguyen <johnn@hx.lcs.mit.edu>.

       Ported to C and X by Jamie Zawinski <jwz@jwz.org>, 13-aug-92.

       Steering code by Jeremie Petit; 3D code by theiling@coli.uni-sb.de.

X Version 11							     13-aug-92							   XScreenSaver(1)