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All of the core Processing methods are available in Ruby-Processing, often in the standard Ruby under_score_fashion. So, the Processing API is a good place to start.
Processing has a wealth of pure-Java libraries for PDF export, video, audio, animation, typography, physics, raytracing, and many others. You can find the rest at the Processing Libraries Page, and download them and drop them into your
library folder. Actually since processing-2.0 many libraries can be installed from the processing ide, but this now only a subset of available libraries toxiclibs libraries for example are not included. Then there are rubygems, avoid those with native code extensions, unless there's a
Ruby-Processing, is being replaced with JRubyArt for processing-3.0+.
There's now a forum, kindly provided by the Processing folks. Come on in and join the conversation.