[vtkusers] Fixed Screen size for a vtkAssembly

[imran khan]

I want to maintain a specified size of an assembly consisting of 3D actors
that has been placed in
a 3D scene irrespective of camera position. I looked at vtkDistanceToCamera
example but it seems
to be operating on polydata.

Is there a class or a filter that can help with this?

Imran
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