substrate(6x)							XScreenSaver manual						     substrate(6x)

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.  Option-
       ally, 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

X Version 11							5.10 (07-Sep-2009)						     substrate(6x)