Zeth Willie is back (always great stuff from Zeth Willie!) with a basic primer of what a pose space deformation is and when and why someone would want to use such a technique when rigging a character. In the example video Zeth uses BSpiritCorrective Shape for Maya which can be found here.

“Going over the basics of what pose space deformation is and why you’d use it. The basic idea being to get accurately modeled corrective shapes for specific poses/deformations and hooking those into the rig so they activate when desired. I also talk a bit about how to fine tune some of the deformations from set driven keys. Note: In the example here I use BSpiritCorrective Shape (here’s a link that works up through 2010 – b-ling.com/?).”