How to use ei to create a arbitrary dynamic TriangleMesh?

As I've found. There are only createStaticTriangleMesh in entityInfomer, while I want to create a danamic one what should I do?

Like a mesh that is changing its form? I don't know if thats possible. If thats sufficent for you, you can use ragdolls to allow static meshes that change their position and rotation to each other.