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/).
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