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rocks(6)		      XScreenSaver manual		      rocks(6)

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  vis‐
       ual]  [-count  integer]	[-delay	 usecs]	 [-speed  integer] [-norotate]
       [-nomove] [-3d] [-fps]

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  cho‐
	       sen 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 number 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!

       -fps    Display the current frame rate and CPU load.

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  ©  1992 by Jamie Zawinski.  Permission to use, copy, modify,
       distribute, and sell this software and its documentation for  any  pur‐
       pose  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 repre‐
       sentations are made about the suitability of this software for any pur‐
       pose.  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		      5.07 (10-Aug-2008)		      rocks(6)
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