Provided by: xscreensaver-data-extra_5.14-1ubuntu1_i386 bug

NAME

       substrate - Grow crystal-like lines on a computational substrate

SYNOPSIS

       substrate    [-display    host:display.screen]    [-foreground   color]
       [-background    color]    [-wireframe]     [-max-cycles     cyclecount]
       [-growth-delay   delayms]   [-initial-cracks  numinitial]  [-max-cracks
       nummax] [-sand-grains numgrains] [-circle-percent circlepercent] [-fps]

DESCRIPTION

       Lines like crystals  grow  on  a  computational  substrate.   A  simple
       perpendicular  growth  rule  creates  intricate  city-like  structures.
       Optionally, cracks may also be circular,  producing  a  cityscape  more
       familiar  to  places  for which city planning is a distant, theoretical
       concern.

       Ported from the code by j.tarbell at http://complexification.net

OPTIONS

       substrate accepts the following options:

       -wireframe (Default: False)
               Don't  draw  sand-painting  colored  effects,   only   make   a
               wireframe.

       -max-cycles cyclecount (Default: 10000)
               Maximum  number of growth cycles before restarting.  The higher
               this is, the more complex the art.

       -growth-delay delayms (Default: 18000)
               Delay in ms between growth cycles.   More  delay,  slower  (but
               smoother and less CPU intensive) art.

       -initial-cracks numinitial (Default: 3)
               Initial number of cracks in the substrate

       -max-cracks nummax (Default: 100)
               Maximum number of cracks in the substrate at a single time

       -sand-grains numgrains (Default: 64)
               Number  of  sand  grains  dropped during coloring.  More grains
               cause a denser colour but use more cpu power.

       -circle-percent circlepercent (Default: 0)
               The percentage of the cracks will be circular.

       -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)

COPYRIGHT

       Copyright   (C)   2003  by  J.  Tarbell  (complex@complexification.net,
       http://www.complexification.net).

       Ported     to     XScreensaver      2004      by      Mike      Kershaw
       (dragorn@kismetwireless.net)

AUTHOR

       J. Tarbell <complex@complexification.net>, Jun-03

       Mike Kershaw <dragorn@kismetwireless.net>, Oct-04