rd-bomb — reaction/diffusion textures

Synopsis

rd-bomb [-display host:display.screen] [-foreground color] [-background color] [-window] [-root] [-install] [-visual visual] [-width n] [-height n] [-reaction n] [-diffusion n] [-size f] [-speed f] [-delay millisecs] [-fps]

Description

The rd-bomb program draws reaction/diffusion textures. The code is derived from the 'd' mode of the "bomb" visual musical instrument (see http://www.cs.cmu.edu/~spot/bomb.html). I got the equations from xmorphia (http://www.ccsf.caltech.edu/ismap/image.html), which is based on a version of the Gray-Scott model taken from:
John E. Pearson "Complex Patterns in a Simple System"
Science, 261,189, 9 July 1993.

If the frame-rate is too low, consider decreasing the width and height of the tile, or decreasing the size of the active part of the screen.

Options

If one of the reaction, diffusion, radius, and palette options is set to a negative value, then that option will be set to a random appropriate value.

Be sure to try "-speed 1 -size 0.1 -epoch 3000".

rd-bomb accepts the following options:

-window
Draw on a newly-created window. This is the default.
-root
Draw on the root window.
-install
Install a private colormap for the window.
-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.
-width n
-height n
Specify the size of the tile, in pixels.
-reaction n
-diffusion n
These are constants in the equations that effect its visual nature. Each may be one of 0, 1, or 2. Default is -1: these constants are chosen randomly.
Size of the seed.
-size f
What fraction of the window is actively drawn, a floating point number between 0 (exclusive) and 1 (inclusive). Default is 1.0.
-speed f
When a fraction of the screen is active, the active area moves at this rate (a floating point number). Default is zero. Suggested value: 1.0.
-delay millisecs
How many milliseconds to delay between frames; default 1, or about 1/1000th of a second.
-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.

Author

Scott Draves <spot@cs.cmu.edu>, 9/97