Besides some new capabilities, API v6.6 differs only minimally from API v6.5. As a result, clients can easily upgrade their API to take advantage of the new capabilities. In addition to all the property and method changes, the API features two new interfaces:
§ _3DMLCreator – This .NET interface is responsible for creating a unified, stream optimized 3D Mesh Layer (3DML) database from point shapefiles with individually referenced 3D model files.
§ ITerrainEffect66 - This interface gives the client access to the animation effect object.