Paya is an object-oriented toolkit for Maya riggers. Unlike other libraries, it doesn't re-wrap maya.cmds or the OpenMaya API. Instead, it adds functionality to PyMEL types at runtime for an integrated and familiar experience.
Included is the most comprehensive, and intuitive, implementation of maths rigging using Python operators
<maths_rigging> available anywhere, with over 100 methods for linear algebra, trigonometry and more.
Customisation goes far beyond PyMEL's virtual classes system to include attribute (including subtype), component and data types with true inheritance for the first time.
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Basics
Install Paya, administer PyMEL patching and get tinkering.
Idioms
Discover workflows particularly suited to Paya.
Types
Documentation for every method on every node, attribute, component and data class.
Full documentation can be found here.