[bug] Blender Exporter : wrong position of nested object instances

Hello,

If I export a scene containing nested instances of the same mesh/object (a tree of objects linked by a parent/child relashionship), and that I load the scene in BabylonJS, mesh positions are altered.

Cases that works:

- If I make every objects "single user", then it works fine.

- If objects are duplicated but not nested, it works too.

In the attachment, a Blender test scene with several layers :

- the first is a tree made of duplicated copies (data is not shared between instances).

- the second is a tree made of duplicated linked instances (same data shared by several object).

- the third one is just a linked duplicate of the same object.

The tested version of BabylonJS is 2.2.