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substrate - Man Page

Grow crystal-like lines on a computational substrate


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


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.


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.


Display the current frame rate and CPU load.

--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.


Draw on a newly-created window.  This is the default.


Draw on the root window.

--window-id number

Draw on the specified window.



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.


The window ID to use with --root.

See Also

X(1), xscreensaver(1)


J. Tarbell <complex@complexification.net>, Jun 2003.
Mike Kershaw <dragorn@kismetwireless.net>, Oct 2004.


6.09-1.fc41 (11-Jun-2024) X Version 11 XScreenSaver manual