I have done several small-scale animations (e.g. force-directed graph, Abelian sandpile) using my own simple classes. Browsing the Processing contributed libraries, I discovered two libraries which appear to support a variety of physics-based and math-friendly classes on which I might base my next hobby projects.
I would appreciate a few top-level comments on the usefulness of the toxiclibs and generativedesign libraries. Important to me also is available documentation, demos and discussions. For example, if the libs were about equally useful (for whatever purpose) I would be tempted to buy the Generative Design book to benefit from the authors' descriptive discussions. Thanks...