http://www.lynda.com/3ds-Max-tutorials/Getting-Started-CAT-Rigging-Tools-3ds-Max/108970-2.html


Discover an alternative to the traditional character rigging workflow with the Character Animation Toolkit (CAT) for 3ds Max, which offers preset character rigs as well as custom tools for creating a rig from scratch. Author Joel Bradley demonstrates animation layers; CAT muscles, which you can use to create a skin that deforms and stretches realistically as your character moves; and the forward/inverse kinematics workflow. The final chapter puts all these features into motion, as you apply the tools to a full character rig with secondary bones and perform a stress test animation.