Antony Ward covers working with twist attributes in Maya’s Spline IK handle.
Antony Ward (antCGi) posts a lot of rigging tutorials that cover the fundamentals for rigging characters with Autodesk Maya. His latest shows some of the benefits of using the twist controls for Maya’s Spline IK.
The tutorial explains how to set up and use Mayas AdvancedTwist Tools, found on the SplineIK handle.
Check out Ward’s getting started series that starts with the fundamentals of joints, constraints, controls, driven keys, IK and FK, rigging hands, feet, and more. All the basics are here! “I am starting with the basics, but over time I will be moving on to more advanced areas of rigging, Ward mentions.