When currently using a vtkPointPicker or vtkCellPicker, the mitk::VtkPropRenderer does not properly prepare vtkAssemblyPaths for traversal by the pickers. In the result, picking does not yield results.

The problem seems to originate in commit b77b2fd5deb1a193 (by Christoph who is in CC). Since then the code is simply not filling the constructed vtkAssemblyPaths anymore.

A fix where I also slightly renamed the corresponding members and added m_ prefixes to them is available.