[vtkusers] how to get object ?

[oka]

Dear VTK users,

After showing my object (unstructuredgrid),
I rotate or zoom up it using
vtkRenderWindowInteractor/vtkInteractorStyleTrackballActor.
After the operation, how can I get the object ?
I can get original renderer, but can't get
zoomed up object.
I want to label it, but only succeeded to put them
on original object only.

Best regards,

Oka

-- 
oka <oka at bpe.es.osaka-u.ac.jp>