This represents an interface to the reference hierarchy.
This method can be used to find out if an object is instanced (instanced pipeline). It Checks if the Derived Object is instanced. If it is, the pipeline part below and including that derived object is instanced. In certain circumstances, objects need to find out whether they are instances or not. Some plugins need this functionality in order to properly interpret the size and position of their ModContext bounding box. Returns True if it is an instance, False otherwise. If the argument is NULL, it also returns False.