substrate - Grow crystal-like lines on a computational substrate
substrate [-display host:display.screen] [-foreground color] [-back-
ground color] [-wireframe] [-max-cycles cyclecount] [-growth-delay
delayms] [-initial-cracks numinitial] [-max-cracks nummax]
[-sand-grains numgrains] [-circle-percent circlepercent]
Lines like crystals grow on a computational substrate. A simple per-
pendicular 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
substrate accepts the following options:
-wireframe (Default: False)
Don’t draw sand-painting colored effects, only make a wire-
-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: 33)
The percentage of the cracks will be circular.
DISPLAY to get the default host and display number.
to get the name of a resource file that overrides the global
resources stored in the RESOURCE_MANAGER property.
Copyright © 2003 by J. Tarbell (email@example.com,
Ported to XScreensaver 2004 by Mike Kershaw (dragorn@kismetwire-
J. Tarbell <firstname.lastname@example.org>, Jun-03
Mike Kershaw <email@example.com>, Oct-04
X Version 11 08-Oct-04 Substrate(1)
Man(1) output converted with