During the weekend I found nice methods to subdivide Triangle collections. Not many hours used though. Back to Mesh rendering now. Actually that is Component rendering, as Mesh consists of Component. Component is abstract base class for Triangle collections such as Strips and Fans.
Components maintain displaylists.
While Mesh is still incomplete, I materialized some thoughts about Model Transformations into classes. Object oriented Modeler is a good idea indeed. Transformations are part of Modeling class hierarcy, which will also contain Templates. Those will be sort of automation tools. Not very easy to describe here.