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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  ©  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