Pose User-Defined Surfaces/Entities
Most users are probably not aware that the Sim4Life poser tool supports user-defined surfaces. Basically, this means that triangle meshes, polylines or vertices can be added to the posable model and deform/move with the posable model.
This can be useful in combination with the shell models, e.g. you can define a patch on the surface and then pose the model with the patch.