A ModelArticulation identifies geometry on the model and is a collection of transformations that can be applied to that geometry.

Contains	Returns true if the collection contains the transformation.
GetByName	Gets a transformation by name.
GetItemByString	Gets a transformation by name.

Count	Gets the number of transformations in the collection.
Item	Gets the transformation at the given index. The index is zero-based.
Name	Gets the name of the articulation.

IAgStkGraphicsModelArticulationCollection  | IAgStkGraphicsModelTransformation  | IAgStkGraphicsModelPrimitive