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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 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!

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  grav-
     ity rainbow.)

     Speed of rotation should be settable.

     Default speed of rotation  should  be  relative  to  forward
     velocity.

COPYRIGHT
     Copyright O 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  permis-
     sion   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.

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