[vtkusers] Porting Vtk pipeline 4.2->5.2

[Andrew Wilford]

I am updating an application from Vtk 4.2->5.2 and am encountering some 
problems with the existing pipeline (which has worked for some years). In 
particular, the application uses polydata and the previous calls to 
GetConsumer() which were used to find a polydata's mapper and a mapper's 
polydata no longer work.

Could someone please explain how this information can be retrieved in the 
5.2 framework?

Thanks,
Andrew Wilford