THis class contains several tree nodes for the covered node.
It is intended to be used for synchronizing a proxy tree.
Implement the update mechanism for geometry/apperance/transformation
changes here - and update the SceneTreeNodes as needed.
So you need to calculate the local data for the proxies
only once, instead of converting a jreality event in every copy instance.
A typical application would be a transformation change,
so one calculates the needed proxy matrix/quaternion representation
only once and sets it for all proxies then by iterating the TreeNodes.
Note: subclasses need to implement Geometry/Transformation/Appearance-Listener
if the EntityFactory is set to update on these events.