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The current version of ruby-processing is now available from 
rubygems.org


gem install ruby-processing


But since 2016 you should install JRubyArt instead


gem install jruby_art # to use the current version of processing



However this version of ruby-processing depends on you having java runtime
(jre7+/jdk7+), and a locally installed version of vanilla processing 
and you should install that first. Required version processing-2.2.1 
You must also set the `PROCESSING_ROOT` in `.rp5rc` see getting 
started  for detailed instructions.

A brief history

Getting Started

From java processing to ruby-processing

FAQs

Render Modes

Built-in Ruby Processing Libraries

Advanced Topics

Gallery

Other Resources

[Changelog][] [Changelog]:https://github.com/jashkenas/ruby-processing/blob/master/CHANGELOG