Through some creative use of SKSE, HydrogensaysHDT (the author of the Physics Extension plugin) has provided a set of tools that create game physics objects that interact and respond to the world around them.
SKSE plugin-based physics extender allowing application of the bullet physics library's skinned mesh physics to actor models in Skyrim. HDT-SMP is an skse plugin allowing more advanced physics interactions to be applied to actors via configuration fil
What is the HDT Physics Extension for Skyrim? It is an SKSE plugin that applies the existing Havok physics engine to other uses in skyrim. Swishing hair, flowing skirts, or the ever popular bouncing boobs.