[vtkusers] Get actual position of actor from an assembly after applying transforms

[pnt1614]

You can use a smart pointer referring to the assembly's matrix. In that way,
you can access to the assembly's matrix after transformation.


vtkSmartPointer<vtkMatrix4x4> m = vtkSmartPointer<vtkMatrix4x4>::New();
m = your_assembly->GetMatrix();






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