How do games like skyrim allow the meshes to be modified (in the characters face section for instance)?
One way I was thinking about doing it was to simply have shape keys (as they are called in blender), that I could then apply to the mesh with sliders, but 1. I don't know if such a file format exists or if I'll have to come up with a format myself, 2. I don't know if "shape keys" if the official name for what they are (basically they are hierarchical (or not) vertex modifiers), and 3. I don't know if this is the way to go, or if I'm complicating (or simplifying) things here.
Any insight on the subject would be much appreciated, and thank you in advance.