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A bubble tube sketch written in Processing. http://www.ultrasonicmadness.org/software/rainbow-bubble/
Rainbow Bubble is a Processing sketch based on a bubble tube with a rainbow effect.
Open the RainbowBubble.pde sketch in Processing and click Export Application from the File menu, fill in the desired settings and click the Export button. The pre-built versions are available for the following platforms and architectures:
Apologies to anyone using macOS but Processing doesn’t allow me to export sketches for it as I am using Arch GNU+Linux.
Download and install a Java Runtime Environment and run the RainbowBubble script from the directory matching the OS and processor (probably application.something64) or alternatively, open RainbowBubble.pde in the Processing IDE and click the Run button on the top-left.
Once the program is working, press the spacebar to toggle the bubbles on and off.
Rainbow Bubble is licensed under the Apache License 2.0.